CN112986376A - High-gradient magnetic field inductive reactance type oil liquid detection device and manufacturing method thereof - Google Patents
High-gradient magnetic field inductive reactance type oil liquid detection device and manufacturing method thereof Download PDFInfo
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 37
- 230000001939 inductive effect Effects 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000889 permalloy Inorganic materials 0.000 claims abstract description 40
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 12
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims abstract description 12
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims abstract description 12
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 13
- 239000003344 environmental pollutant Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
- 230000005684 electric field Effects 0.000 description 6
- 239000002923 metal particle Substances 0.000 description 6
- 239000010720 hydraulic oil Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000006116 polymerization reaction Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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Abstract
The invention provides a high gradient magnetic field inductive reactance type oil liquid detection device, which comprises a micro-fluidic chip and a sensing unit embedded in the micro-fluidic chip; the microfluidic chip comprises a glass slide, a PDMS substrate arranged on the glass slide, a channel inlet arranged in the PDMS substrate, a channel outlet and a detection channel communicated with the channel inlet and the channel outlet; the sensing unit comprises a first detection coil, a second detection coil, a first permalloy and a second permalloy which are arranged in the detection channel; the first detection coil comprises a first contact working surface and a first non-contact working surface, the second detection coil comprises a second contact working surface and a second non-contact working surface, the first non-contact working surface and the second non-contact working surface are arranged in a right-to-right mode, the first contact working surface is tightly attached to the first permalloy, and the second contact working surface is tightly attached to the second permalloy. The technical scheme of the invention solves the technical problem that the detection precision of the existing inductive-reactance type micro-fluidic oil detection chip is limited.
Description
Technical Field
The invention relates to the technical field of oil system fault detection, in particular to a high-gradient magnetic field inductive reactance oil detection device and a manufacturing method thereof.
Background
The hydraulic system is widely applied in the industrial fields of aerospace, ships and the like. With the development of hydraulic technology towards high speed, high pressure and miniaturization, various control elements with high sensitivity and complex structures are continuously introduced into a hydraulic system, which puts higher requirements on the cleanliness of hydraulic oil. The hydraulic mechanical system faults are mainly caused by particle pollutants of hydraulic oil, and the detection of the particle pollutants of the hydraulic oil is an important means for keeping the cleanliness of the hydraulic oil. At present, the main detection method for hydraulic oil particle pollutants comprises the following steps: optical detection, acoustic detection, inductive detection, capacitive detection, and the like. Among them, the induction detection method and the capacitance detection method are widely concerned about the realization of on-line detection. At present, in order to improve the detection accuracy of the inductance detection method and the capacitance detection method, magnetic flux in a detection area is increased by adding a magnetic material. For example, magnetic nanoparticles and silicon steel sheets have been applied to the structural design of detection chips based on microfluidic technology. However, these magnetic materials at present have not high enough permeability and cannot change the distribution state of the magnetic field lines. That is, the magnetic field of the coil is always in a divergent state, and the magnetic flux distribution in the detection area is not uniform, which directly affects the detection accuracy.
Disclosure of Invention
According to the technical problem that the detection precision of the existing inductive reactance type microfluidic oil detection chip is limited, the high-gradient magnetic field inductive reactance type oil detection device and the manufacturing method thereof are provided. According to the invention, a pair of permalloys is adopted at the sensing unit to increase the magnetic field intensity, and the dovetail groove opening structure is designed on the surface of the permalloy structure to form a high-intensity polymerization gradient magnetic field, so that the detection precision is improved.
The technical means adopted by the invention are as follows:
a high gradient magnetic field inductive reactance type oil liquid detection device comprises a micro-fluidic chip and a sensing unit embedded in the micro-fluidic chip; wherein:
the microfluidic chip comprises a glass slide, a PDMS substrate arranged on the glass slide, a channel inlet and a channel outlet which are arranged in the PDMS substrate, and a detection channel communicated with the channel inlet and the channel outlet;
the sensing unit comprises a first detection coil, a second detection coil, a first permalloy and a second permalloy which are arranged in the detection channel; the first detection coil comprises a first contact working surface and a first non-contact working surface, the second detection coil comprises a second contact working surface and a second non-contact working surface, the first non-contact working surface and the second non-contact working surface are arranged in a right-to-right mode, the first contact working surface is tightly attached to the first permalloy, and the second contact working surface is tightly attached to the second permalloy.
Further, the first detection coil comprises a first lead end I and a first lead end II; the second detection coil comprises a second lead end I and a second lead end II; first lead end II and second lead end I connect the power respectively just, the negative pole, and second lead end II is connected to first lead end I for first detection coil and second detection coil are established ties.
Furthermore, the first detection coil and the second detection coil are both planar inductance coils, the number of layers is 3, the number of turns of the coils is 120, the diameter of each coil is 70-500 micrometers, and the coils are tightly attached and arranged in a 0.3 millimeter range.
Furthermore, the first permalloy and the second permalloy are respectively provided with a dovetail groove with a 60-degree opening, the shape of each dovetail groove is an equilateral trapezoid with an opening at the top end, the distance between the openings at the top ends is 300 micrometers, and the length of the bottom of each dovetail groove is 3 millimeters.
Further, the first permalloy and the second permalloy have the length of 160mm, the width of 60mm and the thickness of 3 mm.
The invention also provides a manufacturing method of the high gradient magnetic field inductive reactance type oil liquid detection device, which comprises the following steps:
s1, fixing the detection channel mould and the sensing unit on the glass slide according to the set position;
s2, pouring a model material PDMS on the glass slide, and arranging four enameled leads of the first detection coil and the second detection coil outside the model material to prevent the model material from being poured;
s3, placing the chip with the poured model material in an oven, and baking for 1 hour at the temperature of 80 ℃ to solidify the model material;
and S4, drawing the detection channel mould out of the solidified model material, and punching two holes above the detection channel by using a puncher to form a channel inlet and a channel outlet.
Compared with the prior art, the invention has the following advantages:
1. the high-gradient magnetic field inductive reactance type oil liquid detection device provided by the invention has a high-gradient polymerization magnetic field, and the pair of permalloys is arranged on the sensing unit, so that the magnetization effect of magnetic metal particle pollutants when passing through the sensing unit can be increased, and the detection precision is improved.
2. According to the high-gradient magnetic field reactance type oil detection device provided by the invention, the permalloy of the sensing unit is provided with the dovetail groove opening, and the magnetic field emitted by the coil can be concentrated at the tip end of the dovetail groove by combining the magnetism of the permalloy to form a super-strong magnetic field. The detection channel is arranged at the position, so that the detection precision can be further improved.
3. According to the high gradient magnetic field inductive reactance type oil liquid detection device provided by the invention, the coils are designed into the planar coils, and meanwhile, the distance between the two planar coils is set to be 0.3mm, so that the coupling degree of electric field lines at the sensing unit can be greatly increased, and the electric field intensity is increased.
Based on the reason, the invention can be widely popularized in the fields of oil system fault detection and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a detecting device according to the present invention.
FIG. 2 is a front cross-sectional view of a sensing unit of the present invention.
Fig. 3 is a left side view of the sensing unit of the present invention.
Fig. 4 is a simulation diagram of magnetic field strength of the sensing unit according to the embodiment of the present invention.
FIG. 5 is a graph of signals from 20 μm iron particles detected according to an embodiment of the present invention.
FIG. 6 is a graph of signals from a-70 μm copper particle detector according to an embodiment of the present invention.
In the figure: 1. glass slide; 2. a PDMS substrate; 3. a channel inlet; 4. a channel outlet; 5. a detection channel; 6. a first detection coil; 7. a second detection coil; 8. a first permalloy; 9. a second permalloy; 10. a first contact work surface; 11. a first non-contact working surface; 12. a second contact work surface; 13. a second non-contact working surface; 14. a first lead terminal I; 15. a first lead terminal II; 16. a second lead terminal I; 17. and a second lead terminal II.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
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 present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, the present invention provides a high gradient magnetic field inductive reactance type oil detection device, a micro-fluidic chip and a sensing unit embedded in the micro-fluidic chip, wherein:
the microfluidic chip comprises a glass slide 1, a PDMS substrate 2 arranged on the glass slide 1, a channel inlet 3 and a channel outlet 4 which are arranged in the PDMS substrate 2, and a detection channel 5 communicated with the channel inlet 3 and the channel outlet 4;
as shown in fig. 2, the sensing unit includes a first detection coil 6, a second detection coil 7, a first permalloy 8, and a second permalloy 9 built in the detection channel 5; the first detection coil 6 comprises a first contact working surface 10 and a first non-contact working surface 11, the second detection coil 7 comprises a second contact working surface 12 and a second non-contact working surface 13, the first non-contact working surface 11 and the second non-contact working surface 13 are arranged in a facing mode, the first contact working surface 10 is tightly attached to the first permalloy 8, and the second contact working surface 12 is tightly attached to the second permalloy 9. The first detection coil 6 comprises a first lead end I14 and a first lead end II 15; the second detection coil 7 comprises a second lead end I (16) and a second lead end II 17; the first lead end II 15 and the second lead end I16 are respectively connected with a positive electrode and a negative electrode of a power supply, and the first lead end I14 is connected with the second lead end II 17, so that the first detection coil 6 and the second detection coil 7 are connected in series. After the first detection coil 6 and the second detection coil 7 which are arranged oppositely are electrified, under the combined action of the first permalloy 8 and the second permalloy 9, ferromagnetic solid particle pollutants with the particle size of 20 micrometers and non-ferromagnetic solid particles with the particle size of 70 micrometers are detected by super-strong inductance, and the detected signal graphs are shown in fig. 5 and 6. In addition, as shown in fig. 4, the present embodiment also provides a simulation diagram of the magnetic field strength of the sensing unit.
In specific implementation, as a preferred embodiment of the present invention, as shown in fig. 3, each of the first permalloy 8 and the second permalloy 9 is provided with a 60 ° open dovetail groove, the shape of the dovetail groove is an equilateral trapezoid with an open top end, the distance of the open top end is 300 micrometers, and the length of the bottom of the dovetail groove is 3 mm. Only the dovetail grooves provided on the second permalloy 9 are shown schematically in fig. 3.
In concrete practice, as a preferred embodiment of the present invention, the first permalloy 8 and the second permalloy 9 are each 160mm in length, 60mm in width and 3mm in thickness. The permalloy is iron-nickel alloy, has very high weak magnetic field permeability, and has permeability of 20000-plus 200000, which is more than 100 times higher than that of iron powder and more than 20 times higher than that of silicon steel sheet. The magnetization effect of magnetic metal particle pollutants when passing through the sensing unit can be increased, and the detection precision is improved. And secondly, unlike common magnetic materials, the permalloy also has magnetism gathering performance, and can gather the magnetic field diffused by the coil at the tip end of the dovetail groove by combining with the opening of the dovetail groove to form a super-strong magnetic field. The detection channel is arranged at the position, so that the detection precision can be further improved.
In specific implementation, as a preferred embodiment of the present invention, the first detection coil 6 and the second detection coil 7 are planar inductive coils, and have 3 layers, 120 turns, and 70 to 500 μm diameter, and are closely arranged at 0.3 mm. Because the influence of the coil layer number on the electric field at the sensing unit is not obvious, and the influence of the center distance of adjacent coils on the electric field in the detection area is large, the coil layer number is increased, the number of turns of each layer of coil is reduced, namely the coil is designed into a planar coil, and meanwhile, the distance between the two planar coils is set to be 0.3mm, so that the coupling degree of the electric field lines at the sensing unit can be greatly increased, and the electric field intensity is increased.
The invention also provides a manufacturing method of the high gradient magnetic field inductive reactance type oil liquid detection device, which comprises the following steps:
s1, fixing the detection channel mould and the sensing unit on the glass slide according to the set position;
s2, pouring a model material PDMS on the glass slide, and arranging four enameled leads of the first detection coil and the second detection coil outside the model material to prevent the model material from being poured;
s3, placing the chip with the poured model material in an oven, and baking for 1 hour at the temperature of 80 ℃ to solidify the model material;
and S4, drawing the detection channel mould out of the solidified model material, and punching two holes above the detection channel by using a puncher to form a channel inlet and a channel outlet.
The detection device manufactured by the invention can realize the distinguishing of magnetic metal particle pollutants and non-magnetic metal particle pollutants and the detection of particle sizes. The detection precision of the magnetic metal particle pollutants in the mode can reach 20 microns; the detection precision of the nonmagnetic metal particle pollutants can reach 70 microns.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A high gradient magnetic field inductive reactance type oil liquid detection device comprises a micro-fluidic chip and a sensing unit embedded in the micro-fluidic chip; the method is characterized in that:
the microfluidic chip comprises a glass slide (1), a PDMS substrate (2) arranged on the glass slide (1), a channel inlet (3) arranged in the PDMS substrate (2), a channel outlet (4) and a detection channel (5) communicated with the channel inlet (3) and the channel outlet (4);
the sensing unit comprises a first detection coil (6), a second detection coil (7), a first permalloy (8) and a second permalloy (9) which are arranged on the detection channel (5); the first detection coil (6) comprises a first contact working surface (10) and a first non-contact working surface (11), the second detection coil (7) comprises a second contact working surface (12) and a second non-contact working surface (13), the first non-contact working surface (11) and the second non-contact working surface (13) are arranged in a right-facing mode, the first contact working surface (10) is tightly attached to the first permalloy (8), and the second contact working surface (12) is tightly attached to the second permalloy (9).
2. The high gradient magnetic field inductive reactance oil detection device according to claim 1, characterized in that said first detection coil (6) comprises a first lead end i (14) and a first lead end ii (15); the second detection coil (7) comprises a second lead end I (16) and a second lead end II (17); the first lead end II (15) and the second lead end I (16) are respectively connected with a positive electrode and a negative electrode of a power supply, and the first lead end I (14) is connected with the second lead end II (17) so that the first detection coil (6) and the second detection coil (7) are connected in series.
3. The high gradient magnetic field inductive reactance type oil detection device according to claim 1, characterized in that the first detection coil (6) and the second detection coil (7) are planar inductance coils, the number of layers is 3, the number of turns of the coils is 120, the diameter of the coils is 70-500 μm, and the coils are closely arranged at 0.3 mm.
4. The high gradient magnetic field inductive reactance oil solution detection device according to claim 1, characterized in that each of the first permalloy (8) and the second permalloy (9) is provided with a 60 ° open dovetail groove, the dovetail groove is in the shape of an equilateral trapezoid with an open top end, the distance between the open top ends is 300 micrometers, and the length of the bottom of the dovetail groove is 3 millimeters.
5. The high gradient magnetic field inductive reactance type oil detection device according to claim 4, characterized in that the first permalloy (8) and the second permalloy (9) each have a length of 160mm, a width of 60mm, and a thickness of 3 mm.
6. A method for manufacturing a high gradient magnetic field inductive reactance type oil detection device according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, fixing the detection channel mould and the sensing unit on the glass slide according to the set position;
s2, pouring a model material PDMS on the glass slide, and arranging four enameled leads of the first detection coil and the second detection coil outside the model material to prevent the model material from being poured;
s3, placing the chip with the poured model material in an oven, and baking for 1 hour at the temperature of 80 ℃ to solidify the model material;
and S4, drawing the detection channel mould out of the solidified model material, and punching two holes above the detection channel by using a puncher to form a channel inlet and a channel outlet.
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| CN113533440A (en) * | 2021-07-16 | 2021-10-22 | 瑞得设备科技(江苏)有限公司 | Oil liquid state monitoring device and manufacturing method thereof |
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