CN104006916B - A kind of mutual inductance type magnetic-liquid micro differential pressure sensor - Google Patents
A kind of mutual inductance type magnetic-liquid micro differential pressure sensor Download PDFInfo
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- CN104006916B CN104006916B CN201410235030.0A CN201410235030A CN104006916B CN 104006916 B CN104006916 B CN 104006916B CN 201410235030 A CN201410235030 A CN 201410235030A CN 104006916 B CN104006916 B CN 104006916B
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- induction coil
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- permanent magnet
- iron core
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Abstract
A kind of mutual inductance type magnetic-liquid micro differential pressure sensor, during assembling, excitation coil (3) is wrapped in the middle part of lucite tube (7) first, left induction coil (2 1) and right induction coil (2 2) it is uniform, symmetrical, etc. the winding excitation coil (3) of the number of turn both sides；Left cylindrical permanent magnet (5 1), right cylindrical permanent magnet (5 2) are then fixed on to the two ends of iron core, composite cores are collectively formed, and composite cores are put into lucite tube (7) after adsorbing left magnetic fluid sealing ring (1 1) and right magnetic fluid sealing ring (1 2) respectively in end；Left annular magnet (6 1) and right annular magnet (6 2) are finally fixed to the left end and right-hand member of lucite tube (7) with glue respectively.When minute-pressure is acted on, length change of the iron core (4) in left induction coil (2 1) and right induction coil (2 2) causes the induced electromotive force of induction coil to change and then output voltage signal.The sensor zero point residual voltage is small, and size is small.
Description
Technical field
The invention belongs to magnetic-liquid micro differential pressure sensor, micro-pressure-difference fields of measurement is particularly suitable for use in.
Background technology
Current magnetic-liquid micro differential pressure sensor is still at the experimental stage in the research of China, and principle is as follows：U-shaped organic glass
Magnetic liquid is housed, two-arm wound around coil is simultaneously passed through alternating current inside glass pipe, constitutes bridge circuit with external circuit resistance, there is pressure
U-shaped lucite tube two-arm liquid level produces difference in height Δ h during difference effect, and then coil inductance L changes, and bridge balance is broken
It is bad, the voltage change that is measured by external circuit and then try to achieve pressure difference change.
This kind of self-induction type magnetic-liquid micro differential pressure sensor residual voltage at zero is larger, it is impossible to meet small range accurate measurement
The need for, and the size sensor is larger, it is impossible to meet sensor miniaturization and light-weighted requirement.
The content of the invention
The technical problems to be solved by the invention：In field of micro-pressure measurement, self-induction type magnetic-liquid micro differential pressure sensor zero
Point residual voltage is larger, larger-size problem.
The present invention solves the technical scheme of its technical problem：
A kind of mutual inductance type magnetic-liquid micro differential pressure sensor, the device includes：Left magnetic fluid sealing ring, right magnetic liquid
Sealing ring, left induction coil, right induction coil, excitation coil, iron core, left cylindrical permanent magnet, right cylindrical permanent magnet,
Left annular magnet, right annular magnet, lucite tube.
High intensity enamel covered wire uniform winding, in the centre position of lucite tube, will be constituted excitation coil first,
The left and right sides of excitation coil is uniform, symmetrical, etc. the number of turn the left induction coil of winding and right induction coil, left and right induction coil
A refers to the gap is respectively left between excitation coil；Excitation coil is connected with constant pressure source again, by left induction coil and the right line of induction
It is connected after circle differential concatenation with voltmeter；Then left cylindrical permanent magnet, right cylindrical permanent magnet are fixed on iron core
Two ends, collectively form composite cores, and adsorb respectively in end will after left magnetic fluid sealing ring and right magnetic fluid sealing ring
Composite cores are put into lucite tube；Left annular magnet and right annular magnet are finally fixed to lucite tube with glue respectively
On the symmetrical left end of excitation coil and right-hand member, it is ensured that left annular magnet and left cylindrical permanent magnet and right annular magnet and the right side
Cylindrical permanent magnet Same Name of Ends is relative, for providing restoring force, it is ensured that composite cores are in no differential pressure action in balance
Position, the length of iron core should be met so that when composite cores are in equilbrium position, two end faces of iron core are located at left sensing respectively
At the axial centre of coil and right induction coil.
When pressure difference is not present in lucite tube both sides, in the presence of left and right annular magnet, magnetic liquid is adsorbed with
Composite cores be located at equilbrium position, iron core be located at left induction coil and right induction coil in equal length, left induction coil and
The induced electromotive force that right induction coil is produced is equal, therefore output voltage is zero；When left pressure source P increases, composite cores
Move to the right so that the length that iron core is located in left induction coil reduces, the length increase in right induction coil so that
The induced electromotive force of left induction coil reduces, and the induced electromotive force increase that right induction coil is produced, the two difference is output electricity
Pressure, the opposite voltage signal of on the contrary then output symbol.
Beneficial effects of the present invention：
This kind of mutual inductance type magnetic-liquid micro differential pressure sensor residual voltage at zero is small, and size is small.
Brief description of the drawings
A kind of mutual inductance type magnetic-liquid micro differential pressure sensors of Fig. 1.
In figure：Left magnetic fluid sealing ring 1-1, right magnetic fluid sealing ring 1-2, left induction coil 2-1, right induction coil
2-2, excitation coil 3, iron core 4, left cylindrical permanent magnet 5-1, right cylindrical permanent magnet 5-2, left annular magnet 6-1, the right side
Annular magnet 6-2, lucite tube 7.
Embodiment
By embodiment of accompanying drawing, the invention will be further described：
A kind of mutual inductance type magnetic-liquid micro differential pressure sensor, the device includes：Left magnetic fluid sealing ring 1-1, right magnetic
Liquid sealing ring 1-2, left induction coil 2-1, right induction coil 2-2, excitation coil 3, iron core 4, left cylindrical permanent magnet 5-
1st, right cylindrical permanent magnet 5-2, left annular magnet 6-1, right annular magnet 6-2, lucite tube 7.
First by high intensity enamel covered wire uniform winding in the centre position of lucite tube 7, excitation coil 3 is constituted,
The left and right sides of excitation coil 3 is uniform, symmetrical, etc. the number of turn winding left induction coil 2-1 and right induction coil 2-2, left and right sense
Answer and a refers to the gap is respectively left between coil and excitation coil 3；Excitation coil 3 is connected with constant pressure source again, by left induction coil 2-1
It is connected with after right induction coil 2-2 differential concatenations with voltmeter；Then by left cylindrical permanent magnet 5-1, right cylindrical permanent
Magnet 5-2 is fixed on the two ends of iron core 4, collectively forms composite cores, and adsorbs in end left magnetic fluid sealing ring 1-1 respectively
Composite cores are put into lucite tube 7 with after right magnetic fluid sealing ring 1-2；Finally by left annular magnet 6-1 and right ring
Shape magnet 6-2 is fixed to lucite tube 7 on the symmetrical left end of excitation coil 3 and right-hand member with glue respectively, it is ensured that left annular magnetic
Iron 6-1 is relative with right cylindrical permanent magnet 5-2 Same Name of Ends with left cylindrical permanent magnet 5-1 and right annular magnet 6-2, is used for
There is provided restoring force, it is ensured that composite cores are in equilbrium position in no differential pressure action, the length of iron core 4 should be met so that compound
When magnetic core is in equilbrium position, two end faces of iron core 4 are located at left induction coil 2-1 and right induction coil 2-2 axial direction respectively
Center.As shown in Figure 1.
Described magnetic fluid sealing ring 1-1,1-2 selects keryl Fe3O4Magnetic liquid, because this magnetic liquid performance
Stable, saturation magnetization is high, disclosure satisfy that using needs.
Left coil 2-1, right coil 2-2, the material selection copper cash of excitation coil 3, because the electricalresistivityρ of copper cashcIt is smaller, production
Raw thermal losses is few.
Iron core 4 selects 1Cr13 materials, and relative permeability is about 2400, reduces magnetic circuit leakage field, makes output signal obvious.
Left cylindrical permanent magnet 5-1, right cylindrical permanent magnet 5-2 materials are neodymium iron boron, the two structure, material and category
Property is identical.
Left annular magnet 6-1, right annular magnet 6-2 materials are neodymium iron boron, and the two external diameter is equal with lucite bore,
The two structure, material are identical with attribute.
Lucite tube 7 selects lucite material, because to possess thermal coefficient of expansion small, cheap, anti-for lucite
The features such as tide is good, meets application demand.
Claims (1)
1. a kind of mutual inductance type magnetic-liquid micro differential pressure sensor, the device includes：Left magnetic fluid sealing ring (1-1), right magnetic
Liquid sealing ring (1-2), left induction coil (2-1), right induction coil (2-2), excitation coil (3), iron core (4), left cylinder
Permanent magnet (5-1), right cylindrical permanent magnet (5-2), left annular magnet (6-1), right annular magnet (6-2), lucite
Manage (7)；
First by high intensity enamel covered wire uniform winding in the centre position of lucite tube (7), excitation coil (3) is constituted,
The left and right sides of excitation coil (3) is uniform, symmetrical, etc. the number of turn the left induction coil of winding (2-1) and right induction coil (2-2),
Left induction coil (2-1) and right induction coil (2-2) differential concatenation, respectively leave between left and right induction coil and excitation coil (3)
One refers to the gap；
Left cylindrical permanent magnet (5-1), right cylindrical permanent magnet (5-2) are then fixed on to the two ends of iron core (4), jointly
Composite cores are constituted, and adsorb in end general after left magnetic fluid sealing ring (1-1) and right magnetic fluid sealing ring (1-2) respectively
Composite cores are put into lucite tube (7)；
Left annular magnet (6-1) and right annular magnet (6-2) are finally fixed to lucite tube (7) on excitation with glue respectively
The symmetrical left end of coil and right-hand member,
It is characterized in that：
The length of iron core (4) should be met so that when composite cores are in equilbrium position, two end faces of iron core (4) are located at a left side respectively
At the axial centre of induction coil (2-1) and right induction coil (2-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410235030.0A CN104006916B (en) | 2014-05-30 | 2014-05-30 | A kind of mutual inductance type magnetic-liquid micro differential pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410235030.0A CN104006916B (en) | 2014-05-30 | 2014-05-30 | A kind of mutual inductance type magnetic-liquid micro differential pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104006916A CN104006916A (en) | 2014-08-27 |
| CN104006916B true CN104006916B (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410235030.0A Expired - Fee Related CN104006916B (en) | 2014-05-30 | 2014-05-30 | A kind of mutual inductance type magnetic-liquid micro differential pressure sensor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548608A (en) * | 2016-01-22 | 2016-05-04 | 缪雪峰 | Magnetoelectric sensor for micro-airflow detection |
| CN112577660B (en) * | 2020-11-05 | 2022-09-23 | 清华大学 | Horizontal thin tube type magnetic liquid micro differential pressure sensor |
| CN112595451B (en) * | 2020-11-26 | 2021-11-02 | 清华大学 | Magnetic liquid sensor |
| CN113708592B (en) * | 2021-08-19 | 2022-12-06 | 中国科学院宁波材料技术与工程研究所 | Permanent-magnet self-suspension type magnetic liquid kinetic energy collector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987373A (en) * | 2005-12-23 | 2007-06-27 | 谭成忠 | Vibration sensor based on magnetic suspension principle |
| DE102010021005A1 (en) * | 2010-05-14 | 2011-11-17 | Microfilter Sindringen Filter-Fertigungsgesellschaft Mbh | Transmission device for use with differential pressure display, has annular gap that is provided between pole ring and cabinet so that reluctance force acts between magnetic poles of permanent magnet and pole ring |
| CN202676356U (en) * | 2012-04-13 | 2013-01-16 | 浙江师范大学 | Micro differential pressure sensing test apparatus |
| CN103149384A (en) * | 2013-02-07 | 2013-06-12 | 北京交通大学 | Magnetic liquid acceleration sensor |
| CN103604558A (en) * | 2013-11-28 | 2014-02-26 | 北京交通大学 | Magnetic-liquid micro differential pressure sensor |
-
2014
- 2014-05-30 CN CN201410235030.0A patent/CN104006916B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987373A (en) * | 2005-12-23 | 2007-06-27 | 谭成忠 | Vibration sensor based on magnetic suspension principle |
| DE102010021005A1 (en) * | 2010-05-14 | 2011-11-17 | Microfilter Sindringen Filter-Fertigungsgesellschaft Mbh | Transmission device for use with differential pressure display, has annular gap that is provided between pole ring and cabinet so that reluctance force acts between magnetic poles of permanent magnet and pole ring |
| CN202676356U (en) * | 2012-04-13 | 2013-01-16 | 浙江师范大学 | Micro differential pressure sensing test apparatus |
| CN103149384A (en) * | 2013-02-07 | 2013-06-12 | 北京交通大学 | Magnetic liquid acceleration sensor |
| CN103604558A (en) * | 2013-11-28 | 2014-02-26 | 北京交通大学 | Magnetic-liquid micro differential pressure sensor |
Non-Patent Citations (1)
| Title |
|---|
| 磁流体密封技术;袁林生;《电子机械工程》;20110630;第27卷(第3期);正文第53页第2段-54页第2段，图1 * |
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Granted publication date: 20171031 Termination date: 20210530 |