CN105547574A - Magnetic liquid micro-pressure difference sensor of composite magnetic core - Google Patents
Magnetic liquid micro-pressure difference sensor of composite magnetic core Download PDFInfo
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- CN105547574A CN105547574A CN201610079004.2A CN201610079004A CN105547574A CN 105547574 A CN105547574 A CN 105547574A CN 201610079004 A CN201610079004 A CN 201610079004A CN 105547574 A CN105547574 A CN 105547574A
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- permanent magnet
- magnetic
- composite cores
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- magnetic core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
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Abstract
The invention discloses a magnetic liquid micro-pressure difference sensor of a composite magnetic core, comprising a sensor main body and a bridge circuit portion; the sensor main body comprises two identical parts, wherein each part comprises an organic glass tube, a rubber plug, a coil, an annular permanent magnet, a composite magnetic core and a magnetic liquid; the organic glass tube comprises a large diameter portion and a small diameter portion; a rubber plug is plugged into the top end of the large diameter portion on the top, the composite magnet core is arranged on the inner side of the middle portion, and a coil is wounded on the outer side of the lower end; two ends of the composite magnet core absorb the magnetic liquid in a saturation manner; the annular permanent magnet sleeve the small diameter portion on the lower part; the bottom end of the small diameter is connected to a flexible tube which communicates with the two portions of the sensor main body; and the composite magnet core comprises a magnet core, a first permanent magnet and a second permanent. The invention can measure the air pressure difference in the vertical direction and output the evident electric signals. The distance between the two ports for measuring the air pressure difference is adjustable and the cost can be dramatically reduced.
Description
Technical field
The invention belongs to magnetic-liquid micro differential pressure sensor, be specially adapted to micro-pressure-difference fields of measurement.
Background technology
Current magnetic-liquid micro differential pressure sensor is still at the experimental stage in the research of China, principle is as follows: magnetic liquid is equipped with in U-shaped plexi-glass tubular inside, two-arm winding around also passes into alternating current, bridge diagram is formed with external circuit resistance, two pipe arm liquid levels U-shaped when having a differential pressure action produce difference in height Δ h, and then coil inductance L changes, bridge balance is destroyed, the change in voltage recorded by external circuit so that try to achieve pressure reduction change.
Magnetic-liquid micro differential pressure sensor many employings U-tube designs, in it, inject magnetic liquid, because the relative permeability of magnetic liquid is lower, be about 1.2 (relative permeability of air is 1), so the voltage signal exported is more weak, need to access signal amplification circuit.Inject a large amount of magnetic liquids in U-tube, as patent CN103162896, its cost can be made to increase, on the other hand, the shape of U-tube is fixed, and cannot change U-tube two mouthfuls of distances flexibly, and then change volume flexibly.
Summary of the invention
Technical matters to be solved by this invention is the problem that distance can not change flexibly, volume is fixing that is weak for current original magnetic-liquid micro differential pressure sensor signal in field of micro-pressure measurement existence, input gas port, provides a kind of magnetic-liquid micro differential pressure sensor of composite cores.This sensor, by magnetic liquid being changed into two composite cores, strengthens output voltage signal, is connected by two plexi-glass tubulars simultaneously, makes the distance of two air intake openings adjustable with a flexible pipe, can make its volume-tunable simultaneously.The present invention can measure the draught head of vertical direction, exports electric signal more obvious.In addition, the distance measuring draught head two-port is adjustable flexibly.
Technical scheme of the present invention:
A magnetic-liquid micro differential pressure sensor for composite cores, comprises sensor main body and bridge diagram part;
Wherein, described sensor main body comprises identical two parts, and every part includes machine glass tube, rubber plug, coil, annular permanent magnet, composite cores and magnetic liquid; Wherein, plexi-glass tubular comprises particle size part and small diameter part divides; The top of the particle size part on top is plugged with rubber plug, and inside middle portion is composite cores, and lower end outside is wound with coil; The two ends saturated adsorption of composite cores is magnetic liquid; The small diameter part of bottom divides cover to have annular permanent magnet; A small diameter part point bottom is connected with flexible pipe, and two parts of sensor main body are communicated with by flexible pipe;
Described composite cores comprises magnetic core, the first permanent magnet and the second permanent magnet: wherein, and magnetic core is positioned at the middle part of composite cores, and the first permanent magnet and the second permanent magnet are adsorbed on the two ends of magnetic core respectively, and the first permanent magnet is relative with the second permanent magnet different name end;
First permanent magnet is identical with the second permanent magnet; The length of magnetic core is 15 ~ 20 times of the first permanent magnet length;
Diameter 0.8 ~ the 1.2mm less of the diameter of plexi-glass tubular of magnetic core.
The diameter of the first permanent magnet is greater than/equals the diameter of magnetic core, and is less than the internal diameter of plexi-glass tubular particle size part;
The length of composite cores is 45 ~ 55% of plexi-glass tubular particle size partial-length;
The winding of coil is highly plexi-glass tubular particle size partial-length 22 ~ 27%;
Described bridge diagram portion comprises two coils, the first fixed value resistance R1 and the second fixed value resistance R2 of sensor main body; The resistance value of the first fixed value resistance R1 and the second fixed value resistance R2 is equal;
Wherein, after two coils of transducer body portion are connected with the first fixed value resistance R1, the second fixed value resistance R2 of equivalence respectively, be connected in parallel on the two ends of AC power U, another group is connected with the two ends of surveying instrument respectively on corner node, formation bridge diagram.
Beneficial effect of the present invention is:
The present invention proposes a kind of new composite cores magnetic-liquid micro differential pressure sensor structure, the draught head of vertical direction can be measured, export electric signal more obvious.The distance measuring draught head two-port is adjustable flexibly, and then makes the volume-tunable of micro-pressure sensor.In addition, the present invention, only at a small amount of magnetic liquid of local saturated adsorption of composite cores, does not need to fill magnetic liquid in plexi-glass tubular, can significantly reduce costs.
Output signal more obvious, with inject magnetic liquid in U-tube and compare, the relative permeability of magnetic liquid is approximately 1.2, and the relative permeability of air is 1, so when making magnetic core with magnetic liquid, because liquid level just changes the change of the inductance value of coil in the two-arm caused and not obvious, and then the differential voltage exported can be very little, therefore needs access voltage signal amplifying circuit; And when adopting composite cores, due to the relative permeability comparatively large (being approximately 2400) of composite cores, so the movement of composite cores can make the inductance value change of coil obviously, and then the differential voltage numerical value exported is comparatively large, is do not need access voltage signal amplifying circuit.
Accompanying drawing explanation
Fig. 1 is a kind of magnetic-liquid micro differential pressure sensor schematic diagram of composite cores.
In figure: plexi-glass tubular 1, rubber plug 2, coil 3, annular permanent magnet 4, magnetic core 5, first permanent magnet 6, second permanent magnet 7, magnetic liquid 8, rubber hose 9.
Fig. 2 is bridge diagram schematic diagram.
In figure: the first fixed value resistance R1, the second fixed value resistance R2, AC power U and voltage table V.
Fig. 3 is output voltage and the minute-pressure difference relationship of magnetic-liquid micro differential pressure sensor.
Specific embodiments
Be that the invention will be further described for embodiment with accompanying drawing:
The magnetic-liquid micro differential pressure sensor of a kind of composite cores of the present invention as shown in Figure 1, comprises sensor main body and bridge diagram part;
Wherein, described sensor main body comprises identical two parts, and every part includes machine glass tube 1, rubber plug 2, coil 3, annular permanent magnet 4, composite cores and magnetic liquid 8; Wherein, plexi-glass tubular 1 comprises particle size part and small diameter part divides; The top of the particle size part on top is plugged with rubber plug 2, and inside middle portion is composite cores, and lower end outside is wound with coil 3; The two ends saturated adsorption of composite cores is magnetic liquid 8 (magnetic liquid 8 makes composite cores at plexi-glass tubular 1 inner suspension, and can according to the external gas pressure upper and lower displacement); The small diameter part of bottom divides cover to have annular permanent magnet 4; (external diameter that internal diameter and the small diameter part of annular permanent magnet 4 divide mates, and makes the two fit tightly), a small diameter part point bottom is connected with flexible pipe 9, and two parts of sensor main body are communicated with by flexible pipe 9;
Described composite cores comprises magnetic core 5, first permanent magnet 6 and the second permanent magnet 7: wherein, magnetic core 5 is positioned at the middle part of composite cores, first permanent magnet 6 and the second permanent magnet 7 are adsorbed on the two ends of magnetic core 5 respectively, and the first permanent magnet 6 is relative with the second permanent magnet 7 different name end; Annular permanent magnet 4 is relative with permanent magnet 7 Same Name of Ends;
First permanent magnet 6 is identical with the second permanent magnet 7; The length of magnetic core 5 is 15 ~ 20 times of the first permanent magnet 6 length;
Diameter 0.8 ~ the 1.2mm less of the diameter of plexi-glass tubular of magnetic core 5.
The diameter of the first permanent magnet 6 is greater than/equals the diameter of magnetic core 5, and is less than the internal diameter of plexi-glass tubular 1 particle size part;
The length of composite cores is approximately 45 ~ 55% of plexi-glass tubular particle size partial-length;
The winding height length of shared plexi-glass tubular (during the winding) of coil 3 is plexi-glass tubular particle size partial-length 22 ~ 27%;
Its method for making is: first by high strength enamel covered wire evenly, etc. the number of turn, be wrapped in the lower end (upside that small diameter part divides) of plexi-glass tubular 1 particle size part symmetrically, form coil 3; Then the first permanent magnet 6 and the second permanent magnet 7 are adsorbed on respectively the two ends of magnetic core 5, ensure that the first permanent magnet 6 is relative with the second permanent magnet 7 different name end, the one the second permanent magnets and magnetic core 5 form composite cores jointly; Magnetic liquid 8 is injected respectively the end of the first permanent magnet 6 and the second permanent magnet 7, form two sealing rings; The composite cores being adsorbed with magnetic liquid 8 is put into plexi-glass tubular 1 respectively, and the effect of magnetic liquid 8 is suspended by composite cores, reduces friction force during composite cores motion, and form upper sealing and the lower seal of plexi-glass tubular 1; Small diameter part annular permanent magnet 4 being enclosed within plexi-glass tubular 1 afterwards divides, and should ensure that annular permanent magnet 4 is relative with the Same Name of Ends of composite cores, and effect is to provide restoring force, ensures that composite cores is in equilibrium position when not having differential pressure action, as shown in Figure 1; By rubber hose 9, the port that small diameter part bottom plexi-glass tubular 1 divides is coupled together, form connected component; It is last that on the top of plexi-glass tubular 1, rubber plug 2, two rubber plugs 2 filled in glass tube can make the inside of particle size part be connected with external gas potential source P1, P2 respectively by intubate.
Described bridge diagram part as shown in Figure 2, is made up of two coils 3, first fixed value resistance R1, the second fixed value resistance R2 and AC power and voltage table; The resistance value of the first fixed value resistance R1 and the second fixed value resistance R2 is equal;
Wherein, after two coils 3 of transducer body portion are connected with the first fixed value resistance R1, the second fixed value resistance R2 of equivalence respectively, be connected in parallel on the two ends of AC power U, another group is connected with the two ends of voltage table (or other surveying instrument) respectively on corner node, forms bridge diagram.
Described plexi-glass tubular 1 selects organic glass material, and the feature such as thermal expansivity is little because organic glass possesses, low price, not magnetic conduction, moisture resistance are good, meets application demand.
Rubber plug 2 is butyl rubber, because it has imperviousness to air, is widely used in sealing, can meets the application demand of sensor.
The material selection copper cash of high strength enamel covered wire circle 3, because the electricalresistivityρ of copper cash
cless, the thermal losses of generation is few.
Annular permanent magnet 4 is annular, and material is neodymium iron boron N35.
Magnetic core 5 is cylindrical, and select 1Cr13 material (geneva stainless steel), relative permeability is about 2400, and output signal obviously.
First permanent magnet 6 and the second permanent magnet 7 are cylindrical, and material is neodymium iron boron N35, and the two structure, material are identical with attribute.
Magnetic liquid 8 for volumetric concentration be the keryl Fe of 8%
3o
4magnetic liquid, because magnetic liquid performance is stablized for this reason, saturation magnetization is high, can meet application needs.
Rubber hose 9 is the rubber mix such as nitrile rubber and Ethylene Propylene Terpolymer glue pipe, and good sealing effect, can meet the application requirement of sensor.
Use-case:
Plexi-glass tubular 1 particle size part internal diameter 9mm, the long 100mm of particle size part, small diameter part divides long 6mm, long 10mm bottom thin footpath; Rubber plug 2 is butyl rubber, can ensure to seal; Get high strength enamel covered wire circle 3 diameter 0.1mm under normal temperature, the number of turn is 1000 circles, and institute's galvanization is 0.17A, voltage 2.76V, frequency 1000Hz; Annular permanent magnet 4 selects NdFeB material N35, internal diameter 6mm, external diameter 16mm, height 6mm; Magnetic core 5 diameter of section 8mm, height 47mm, cylindrical permanent magnet 6 and 7 selects NdFeB material, diameter of section 8mm, length 2.5mm, totally four; Magnetic liquid 8 is keryl Fe
3o
4magnetic liquid, viscosity is 2.45Pss, and saturation magnetization is 23.4emu/g; Rubber hose 9 is the rubber mix such as nitrile rubber and Ethylene Propylene Terpolymer glue pipe, reaches sealing effectiveness.
Use-pattern of the present invention is: by plexi-glass tubular and inner composite cores thereof after horizontal experiment table is vertically put well, is communicated with by left and right plexi-glass tubular, and connects circuit as shown in Figure 2 with flexible pipe.Respectively two different pneumatic supplies are connected with the piston of left and right plexi-glass tubular, judge the pressure reduction of two pneumatic supplies according to the output voltage of voltage table.
Figure 3 shows that the output voltage of magnetic-liquid micro differential pressure sensor and the relation of micro-pressure-difference: when left and right plexi-glass tubular does not exist pressure reduction, under the effect of left and right annular permanent magnet, the left and right composite cores being adsorbed with magnetic liquid is positioned at the equilibrium position of left and right plexi-glass tubular, the inductance of left and right coil is equal, and bridge diagram output voltage is zero (because the output voltage values in the cause charts such as error 3 is approximately 0); When the pressure source P1 at left plexi-glass tubular place increases, left composite cores moves down, and enters left coil, and it is inner that the air simultaneously in left plexi-glass tubular can enter right plexi-glass tubular along rubber hose, makes right composite cores away from right coil.Because in composite cores, the relative permeability of magnetic core is about 2400, therefore the inductance of left coil obviously increases, and bridge diagram exports obvious positive voltage signal, as shown in Fig. 3 right half part; When P1 reduces, left composite cores moves up, and right composite cores moves down, the negative voltage signal that bridge diagram output symbol is contrary, as shown in Fig. 3 left-half.As shown in Figure 3, in certain scope, micro-pressure-difference and differential voltage value meet linear relationship, further by the magnitude of voltage that records to calculate minute-pressure difference.
Unaccomplished matter of the present invention is known technology.
Claims (4)
1. a magnetic-liquid micro differential pressure sensor for composite cores, is characterized by this sensor and comprises sensor main body and bridge diagram part;
Wherein, described sensor main body comprises identical two parts, and every part includes machine glass tube, rubber plug, coil, annular permanent magnet, composite cores and magnetic liquid; Wherein, plexi-glass tubular comprises particle size part and small diameter part divides; The top of the particle size part on top is plugged with rubber plug, and inside middle portion is composite cores, and lower end outside is wound with coil; The two ends saturated adsorption of composite cores is magnetic liquid; The small diameter part of bottom divides cover to have annular permanent magnet; A small diameter part point bottom is connected with flexible pipe, and two parts of sensor main body are communicated with by flexible pipe;
Described composite cores comprises magnetic core, the first permanent magnet and the second permanent magnet: wherein, and magnetic core is positioned at the middle part of composite cores, and the first permanent magnet and the second permanent magnet are adsorbed on the two ends of magnetic core respectively, and the first permanent magnet is relative with the second permanent magnet different name end;
Annular permanent magnet is relative with permanent magnet Same Name of Ends;
First permanent magnet is identical with the second permanent magnet; The length of magnetic core is 15 ~ 20 times of the first permanent magnet length;
The diameter of the first permanent magnet is greater than/equals the diameter of magnetic core, and is less than the internal diameter of plexi-glass tubular particle size part;
Described bridge diagram portion comprises two coils, the first fixed value resistance R1 and the second fixed value resistance R2 of sensor main body; The resistance value of the first fixed value resistance R1 and the second fixed value resistance R2 is equal;
Wherein, after two coils of transducer body portion are connected with the first fixed value resistance R1, the second fixed value resistance R2 of equivalence respectively, be connected in parallel on the two ends of AC power U, another group is connected with the two ends of surveying instrument respectively on corner node, formation bridge diagram.
2. the magnetic-liquid micro differential pressure sensor of composite cores as claimed in claim 1, is characterized by the diameter 0.8 ~ 1.2mm less of the diameter of plexi-glass tubular of magnetic core.
3. the magnetic-liquid micro differential pressure sensor of composite cores as claimed in claim 1, the length that it is characterized by composite cores is 45 ~ 55% of plexi-glass tubular particle size partial-length.
4. the magnetic-liquid micro differential pressure sensor of composite cores as claimed in claim 1, the winding that it is characterized by coil is highly plexi-glass tubular particle size partial-length 22 ~ 27%.
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| CN201610079004.2A CN105547574B (en) | 2016-02-04 | 2016-02-04 | A kind of magnetic-liquid micro differential pressure sensor of composite cores |
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| CN201610079004.2A CN105547574B (en) | 2016-02-04 | 2016-02-04 | A kind of magnetic-liquid micro differential pressure sensor of composite cores |
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| CN105547574B CN105547574B (en) | 2018-10-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044542A (en) * | 2019-04-03 | 2019-07-23 | 北京交通大学 | A kind of inductance type magnetic liquid micro-pressure sensor based on slider-crank mechanism |
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| US4023278A (en) * | 1975-09-05 | 1977-05-17 | Hoyt Charles D | Two axis attitude sensor |
| CN103162896A (en) * | 2013-03-15 | 2013-06-19 | 北京交通大学 | High-sensitivity magnetic liquid micro-pressure difference sensor |
| CN103542975A (en) * | 2013-10-09 | 2014-01-29 | 北京交通大学 | Micro-differential-pressure magnetic liquid sensor with high sensitivity |
| CN104006915A (en) * | 2014-05-29 | 2014-08-27 | 北京交通大学 | Wide-range magnetic liquid micro differential pressure transducer |
| CN204679145U (en) * | 2014-10-11 | 2015-09-30 | 北京交通大学 | A kind of magnetic liquid level sensor |
| CN205333239U (en) * | 2016-02-04 | 2016-06-22 | 河北工业大学 | Magnetic liquid micro-pressure difference sensor of composite magnetic core |
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2016
- 2016-02-04 CN CN201610079004.2A patent/CN105547574B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4023278A (en) * | 1975-09-05 | 1977-05-17 | Hoyt Charles D | Two axis attitude sensor |
| CN103162896A (en) * | 2013-03-15 | 2013-06-19 | 北京交通大学 | High-sensitivity magnetic liquid micro-pressure difference sensor |
| CN103542975A (en) * | 2013-10-09 | 2014-01-29 | 北京交通大学 | Micro-differential-pressure magnetic liquid sensor with high sensitivity |
| CN104006915A (en) * | 2014-05-29 | 2014-08-27 | 北京交通大学 | Wide-range magnetic liquid micro differential pressure transducer |
| CN204679145U (en) * | 2014-10-11 | 2015-09-30 | 北京交通大学 | A kind of magnetic liquid level sensor |
| CN205333239U (en) * | 2016-02-04 | 2016-06-22 | 河北工业大学 | Magnetic liquid micro-pressure difference sensor of composite magnetic core |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044542A (en) * | 2019-04-03 | 2019-07-23 | 北京交通大学 | A kind of inductance type magnetic liquid micro-pressure sensor based on slider-crank mechanism |
| CN110044542B (en) * | 2019-04-03 | 2020-04-17 | 北京交通大学 | Inductance type magnetic liquid micro-differential pressure sensor based on slider-crank mechanism |
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| CN105547574B (en) | 2018-10-26 |
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