CN1260542C - Anti-high voltage electric vortex shift sensor - Google Patents
Anti-high voltage electric vortex shift sensor Download PDFInfo
- Publication number
- CN1260542C CN1260542C CN 200410053924 CN200410053924A CN1260542C CN 1260542 C CN1260542 C CN 1260542C CN 200410053924 CN200410053924 CN 200410053924 CN 200410053924 A CN200410053924 A CN 200410053924A CN 1260542 C CN1260542 C CN 1260542C
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- Prior art keywords
- high pressure
- skeleton
- pressure resistant
- eddy current
- displacement sensor
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Abstract
The present invention discloses a high pressure resistant eddy current displacement sensor which comprises a shell, a skeleton and a short circuit ring, wherein the skeleton is wound with an induction coil; an inner casing is installed between the short circuit ring and the skeleton; the inner casing is made from high pressure resistant non magnetic materials, and the shell is made from soft magnetic materials; the induction coil is formed by winding a high strength conductor parallelly, and is used for measuring dynamic or static displacement. The present invention has the advantages of wide working measuring range, good linearity, high mechanical strength, high thermal stability and wide frequency response, and overcomes the limitation of a conventional eddy current displacement sensor. Therefore, the present invention can be widely applied to the displacement measurement of a valve core, a hydraulic cylinder piston, etc. in a high pressure environment.
Description
Technical field
The present invention relates to the non-electrical quantity measurement technology field, relate in particular to a kind of high pressure resistant eddy current displacement sensor.
Background technology
Traditional eddy current displacement sensor adopts inductive coil as probe, feeds high-frequency ac current in the coil and produces alternating magnetic field, and Measuring Object produces ring-type induction current, i.e. current vortex under the high frequency magnetic field effect; Current vortex can be resisted the action of a magnetic field, and the power of eddy effect changes along with the variation of the relative position between Measuring Object and high frequency probe; Thereby cause the variation of inductive coil parameter, and obtain corresponding displacement signal by subsequent process circuit.It has highly sensitive, non-cpntact measurement, frequency response advantages of higher; But its deficiency is that the range of linearity is little, and range is restricted; When measuring wide range, need to increase probe size, bring very big inconvenience to application; And the initial alignment of sensor is comparatively loaded down with trivial details.
Summary of the invention
Reduce probe size simultaneously in order to increase its measurement range, enlarge its efficient working range, reduce external environmental interference, the object of the present invention is to provide a kind of high pressure resistant eddy current displacement sensor.
The technical solution adopted for the present invention to solve the technical problems is:
Comprise shell, be wound with inductive coil skeleton, be contained in the short-circuited conducting sleeve in the skeleton.Between short-circuited conducting sleeve and skeleton inner housing is housed, inner housing is that high pressure resistant non-magnet material is made, and shell is that soft magnetic material is made.
The shell piecemeal of soft magnetic material is spliced.Inductive coil is for putting down around the formula inductive coil.Short-circuited conducting sleeve is that conductive material is made.Short-circuited conducting sleeve is solid bar or hollow bar.
The present invention compares with background technology, and the useful effect that has is:
1. adopt the solenoid type structure, enlarged the range of linearity of eddy current displacement sensor, increased the measurement range;
2. coil adopts and puts down around formula, and resistance is little, and temperature drift is little;
3. structural manufacturing process is simple, and antijamming capability is strong, and cost is low;
4. calibration process is simple, is easy to use.
Therefore the present invention can be widely used in the displacement measurement of spool or hydraulic cylinder piston etc. in the hyperbaric environment.
Description of drawings
Accompanying drawing is a structural principle synoptic diagram of the present invention.
In the accompanying drawing: 1. shell, 2. inductive coil, 3. skeleton, 4. short-circuited conducting sleeve, 5. inner housing, 6. O-ring seal, 7. valve body, 8. spool.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in drawings, the present invention includes shell 1, the skeleton 3 that is wound with inductive coil 2, the short-circuited conducting sleeve 4 that is contained in the skeleton 3 constitutes.Between short-circuited conducting sleeve 4 and skeleton 3, inner housing 5 is housed; Inner housing 5 adopts high pressure resistant non-magnet material such as non-magnetic stainless steel to make; Shell 1 adopts soft magnetic material such as electrical pure iron to make; Inductive coil 2 adopt high-strength paint coated copper wires flat around; Short-circuited conducting sleeve 4 is made of such as copper by conductive material; Shell 1 can the piecemeal splicing.Short-circuited conducting sleeve 4 can adopt modes such as screw thread to be connected with spool 8.
Pressure fluid Ps enters the P chamber through valve port, and the P cavity pressure can reach 32MPa; Inner housing 5 is made by high pressure resistant non-magnet material, and fitted seal circle 6, inner housing 5 can effective isolation hyperbaric environment P chambeies, devices such as protection coil.Inductive coil 2 is flat on coil rack 3, and coil rack 3 selects for use the comparatively stable material of temperature coefficient to make, and reduces thermal deformation.Inductive coil 2 feeds high-frequency ac current, produce alternating magnetic field, the vortex induction phenomenon takes place in short-circuited conducting sleeve 4 under action of alternating magnetic field, the resistance alternating magnetic field changes, thereby cause the impedance variation of inductive coil 2, owing to short-circuited conducting sleeve 4 positions along with spool changes, so the variation of the resistance value of inductive coil 2 directly and spool displacement be varied to direct ratio.Inductive coil 2 inserts in the full-bridge circuits as a brachium pontis, and full-bridge circuit is by exchanging the fixed ampllitude voltage drive, centre tap output voltage signal Uo, so the impedance variation of inductive coil 2 can be converted into by the full bridge measurement circuit be voltage signal output.
Claims (5)
1. high pressure resistant eddy current displacement sensor, comprise shell (1), be wound with inductive coil skeleton (3), be contained in the short-circuited conducting sleeve (4) in the skeleton (3), it is characterized in that: between short-circuited conducting sleeve (4) and skeleton (3), inner housing (5) is housed, inner housing (5) is high pressure resistant non-magnet material, and shell (1) is a soft magnetic material.
2. a kind of high pressure resistant eddy current displacement sensor according to claim 1 is characterized in that: the shell of soft magnetic material (1) piecemeal is spliced.
3. a kind of high pressure resistant eddy current displacement sensor according to claim 1 is characterized in that: inductive coil is for putting down around formula inductive coil (2).
4. a kind of high pressure resistant eddy current displacement sensor according to claim 1 is characterized in that: short-circuited conducting sleeve (4) is a conductive material.
5. a kind of high pressure resistant eddy current displacement sensor according to claim 1 is characterized in that: short-circuited conducting sleeve (4) is solid bar or hollow bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410053924 CN1260542C (en) | 2004-08-18 | 2004-08-18 | Anti-high voltage electric vortex shift sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410053924 CN1260542C (en) | 2004-08-18 | 2004-08-18 | Anti-high voltage electric vortex shift sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587893A CN1587893A (en) | 2005-03-02 |
| CN1260542C true CN1260542C (en) | 2006-06-21 |
Family
ID=34603005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410053924 Expired - Fee Related CN1260542C (en) | 2004-08-18 | 2004-08-18 | Anti-high voltage electric vortex shift sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1260542C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2803533C (en) | 2010-07-01 | 2018-03-06 | National Oilwell Varco, L.P. | Blowout preventer monitoring system and method of using same |
| US20120249128A1 (en) * | 2011-03-28 | 2012-10-04 | GM Global Technology Operations LLC | Magnetic sensor system |
| CN103512697B (en) * | 2013-10-09 | 2016-03-09 | 中国电子科技集团公司第四十八研究所 | A kind of Radiation-resistant high-temperature-respressure pressure sensor |
| CN105841732B (en) * | 2014-02-13 | 2018-05-22 | 浙江大学 | A kind of current vortex sensor static state automated calibration system |
| CN106643450A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Micro-stroke, double-redundancy torsion-preventive LVDT displacement sensor |
| CN106500580B (en) * | 2016-09-26 | 2019-07-09 | 珠海格力电器股份有限公司 | Eddy current displacement sensor and its probe and coil |
| CN113309761B (en) * | 2021-06-22 | 2022-09-13 | 重庆工业职业技术学院 | Magnetism-gas position detection device |
-
2004
- 2004-08-18 CN CN 200410053924 patent/CN1260542C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1587893A (en) | 2005-03-02 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060621 Termination date: 20120818 |