CN105547574B - A kind of magnetic-liquid micro differential pressure sensor of composite cores - Google Patents
A kind of magnetic-liquid micro differential pressure sensor of composite cores Download PDFInfo
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- CN105547574B CN105547574B CN201610079004.2A CN201610079004A CN105547574B CN 105547574 B CN105547574 B CN 105547574B CN 201610079004 A CN201610079004 A CN 201610079004A CN 105547574 B CN105547574 B CN 105547574B
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- permanent magnet
- composite cores
- magnetic
- lucite tube
- liquid
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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
Abstract
The present invention is a kind of magnetic-liquid micro differential pressure sensor of composite cores.It includes sensor main body and bridge circuit part；Wherein, the sensor main body includes identical two parts, and each section includes lucite tube, rubber stopper, coil, annular permanent magnet, composite cores and magnetic liquid；Wherein, lucite tube includes particle size part and thin footpath part；The top of the particle size part on top is plugged with rubber stopper, and inside middle portion is composite cores, and lower end outside is wound with coil；The both ends saturation of composite cores is adsorbed with magnetic liquid；The thin footpath part of lower part is cased with annular permanent magnet；Thin footpath member base end is connected with hose, and two parts of sensor main body are connected to by hose；The composite cores include magnetic core, the first permanent magnet and the second permanent magnet.The present invention carries the draught head of measurable vertical direction, and output electric signal becomes apparent from.The distance for measuring draught head two-port is flexibly adjustable, and can significantly reduce cost.
Description
Technical field
The invention belongs to magnetic-liquid micro differential pressure sensors, especially suitable for micro-pressure-difference fields of measurement.
Background technology
Research of the magnetic-liquid micro differential pressure sensor in China at present is still at the experimental stage, and principle is as follows：U-shaped organic glass
Magnetic liquid is housed, two-arm wound around coil is simultaneously passed through alternating current, constitutes bridge circuit with external circuit resistance, there is pressure inside glass pipe
Two U-shaped pipe arm liquid levels generate difference in height Δ h when difference effect, and then coil inductance L changes, and bridge balance is destroyed,
Pressure difference variation is acquired by the voltage change measured by external circuit.
Magnetic-liquid micro differential pressure sensor mostly uses U-tube design, magnetic liquid is injected into it, due to magnetic liquid
Relative permeability is relatively low, is that 1.2 or so (relative permeability of air is 1) need to access so the voltage signal of output is weaker
Signal amplification circuit.A large amount of magnetic liquid is injected in U-tube, such as patent CN103162896, its cost can be made to increase, it is another
The shape of aspect, U-tube is fixed, and can not flexibly change two mouthfuls of distances of U-tube, and then flexibly change volume.
Invention content
The technical problems to be solved by the invention are micro- for currently original magnetic liquid existing for field of micro-pressure measurement
Differential pressure pickup signal is weak, inputs the problem that the distance of gas port cannot flexibly change, volume is fixed, and provides a kind of composite cores
Magnetic-liquid micro differential pressure sensor.The sensor is by changing magnetic liquid into two composite cores, enhancing output voltage letter
Number, while two lucite tubes being connected with a hose, keep the distance of two air inlets adjustable, while can make its volume can
It adjusts.The present invention can measure the draught head of vertical direction, and output electric signal becomes apparent from.In addition, measuring the distance of draught head two-port
It is flexibly adjustable.
Technical scheme of the present invention：
A kind of magnetic-liquid micro differential pressure sensor of composite cores, including sensor main body and bridge circuit part；
Wherein, the sensor main body includes identical two parts, each section include lucite tube, rubber stopper,
Coil, annular permanent magnet, composite cores and magnetic liquid；Wherein, lucite tube includes particle size part and thin footpath part；Top
The top of particle size part be plugged with rubber stopper, inside middle portion is composite cores, and lower end outside is wound with coil；The two of composite cores
End saturation is adsorbed with magnetic liquid；The thin footpath part of lower part is cased with annular permanent magnet；Thin footpath member base end is connected with hose, hose
Two parts of sensor main body are connected to；
The composite cores include magnetic core, the first permanent magnet and the second permanent magnet：Wherein, magnetic core is located at composite cores
Middle part, the first permanent magnet and the second permanent magnet are adsorbed on the both ends of magnetic core, and the first permanent magnet and the second permanent magnet different name respectively
End is opposite；
First permanent magnet and the second permanent magnet are identical；The length of magnetic core is 15~20 times of the first permanent magnetism body length；
The diameter of magnetic core is smaller 0.8~1.2mm than the diameter of lucite tube.
The diameter of first permanent magnet is more than/is equal to the diameter of magnetic core, and less than the internal diameter of lucite tube particle size part；
The length of composite cores is the 45~55% of lucite tube particle size partial-length；
The winding height of coil is lucite tube particle size partial-length 22~27%；
The bridge circuit portion includes two coils, the first fixed value resistance R1 and the second fixed value resistance of sensor main body
R2；The resistance value of first fixed value resistance R1 and the second fixed value resistance R2 are equal；
Wherein, two coils of transducer body portion respectively with the first equivalent fixed value resistance R1, the second fixed value resistance
After R2 series connection, the both ends of AC power U are connected in parallel on, another group connect the both ends respectively with measuring instrument on corner node, constitutes
Bridge circuit.
Beneficial effects of the present invention are：
The present invention proposes a kind of new composite cores magnetic-liquid micro differential pressure sensor structure, can measure vertical direction
Draught head, output electric signal become apparent from.The distance for measuring draught head two-port is flexibly adjustable, and then makes the body of micro-pressure sensor
Product is adjustable.In addition, the present invention only adsorbs a small amount of magnetic liquid in the part saturation of composite cores, it need not be in lucite tube
Magnetic liquid is filled, cost can be significantly reduced.
Output signal becomes apparent from, and is compared with magnetic liquid is injected in U-tube, the relative permeability of magnetic liquid is about
It is 1.2, and the relative permeability of air is 1, so when making magnetic core with magnetic liquid, two-arm caused by changing due to liquid level height
The variation of the inductance value of coil is not obvious, and then the differential voltage meeting very little exported, it is therefore desirable to be accessed voltage signal and be put
Big circuit；And when using composite cores, since the relative permeability of composite cores is larger (being about 2400), so composite cores
The mobile inductance value that can make coil change apparent, and then the differential voltage numerical value exported is larger, is that need not access voltage letter
Number amplifying circuit.
Description of the drawings
Fig. 1 is a kind of magnetic-liquid micro differential pressure sensor schematic diagram of composite cores.
In figure：Lucite tube 1, rubber stopper 2, coil 3, annular permanent magnet 4, magnetic core 5, the first permanent magnet 6, the second permanent magnetism
Body 7, magnetic liquid 8, rubber hose 9.
Fig. 2 is bridge circuit schematic diagram.
In figure：First fixed value resistance R1, the second fixed value resistance R2, AC power U and voltmeter V.
Fig. 3 is the output voltage and minute-pressure difference relationship of magnetic-liquid micro differential pressure sensor.
Specific embodiment
Using attached drawing as specific implementation mode, the invention will be further described：
A kind of magnetic-liquid micro differential pressure sensor of composite cores of the present invention is as shown in Figure 1, include sensor master
Body and bridge circuit part；
Wherein, the sensor main body includes identical two parts, and each section includes lucite tube 1, rubber stopper
2, coil 3, annular permanent magnet 4, composite cores and magnetic liquid 8；Wherein, lucite tube 1 includes particle size part and small diameter part
Point；The top of the particle size part on top is plugged with rubber stopper 2, and inside middle portion is composite cores, and lower end outside is wound with coil 3；It is multiple
The both ends saturation of conjunction magnetic core is adsorbed with magnetic liquid 8, and (magnetic liquid 8 makes composite cores suspend in lucite tube 1, and can root
According to the external gas pressure upper and lower displacement)；The thin footpath part of lower part is cased with annular permanent magnet 4；(internal diameter of annular permanent magnet 4 with it is thin
The outer diameter of path portion matches, and both makes to fit closely), thin footpath member base end is connected with hose 9, and hose 9 is by sensor main body
Two parts are connected to；
The composite cores include magnetic core 5, the first permanent magnet 6 and the second permanent magnet 7：Wherein, magnetic core 5 is located at compound magnetic
The middle part of core, the first permanent magnet 6 and the second permanent magnet 7 are adsorbed on the both ends of magnetic core 5 respectively, and the first permanent magnet 6 and second is forever
7 different name end of magnet is opposite；Annular permanent magnet 4 is opposite with 7 Same Name of Ends of permanent magnet；
First permanent magnet 6 is identical with the second permanent magnet 7；The length of magnetic core 5 is the 15~20 of 6 length of the first permanent magnet
Times；
The diameter of magnetic core 5 is smaller 0.8~1.2mm than the diameter of lucite tube.
The diameter of first permanent magnet 6 is more than/is equal to the diameter of magnetic core 5, and interior less than 1 particle size part of lucite tube
Diameter；
The length of composite cores is about the 45~55% of lucite tube particle size partial-length；
The winding height (length of shared lucite tube when winding) of coil 3 is lucite tube particle size partial-length 22
~27%；
Its production method is：First by high intensity enamel covered wire uniformly, etc. the number of turns, be symmetrically wrapped in lucite tube 1
The lower end (upside of thin footpath part) of particle size part constitutes coil 3；Then the first permanent magnet 6 and the second permanent magnet 7 are inhaled respectively
It is attached to the both ends of magnetic core 5, ensures that the first permanent magnet 6 and 7 different name end of the second permanent magnet are opposite, the one the second permanent magnet and magnetic cores 5
Collectively form composite cores；Magnetic liquid 8 is injected separately into the end of the first permanent magnet 6 and the second permanent magnet 7, composition two is close
Seal ring；The composite cores for being adsorbed with magnetic liquid 8 are respectively put into lucite tube 1, the effect of magnetic liquid 8 is will be compound
Magnetic core suspends, and reduces frictional force when composite cores movement, and form the upper sealing of lucite tube 1 and lower sealing；Later will
Annular permanent magnet 4 is sleeved on the thin footpath part of lucite tube 1, should ensure that annular permanent magnet 4 is opposite with the Same Name of Ends of composite cores,
Effect is to provide restoring force, ensures that composite cores are in equilbrium position in no differential pressure action, as shown in Figure 1；It is soft with rubber
Pipe 9 connects the port of 1 bottom thin footpath part of lucite tube, constitutes connected component；Finally on the top of lucite tube 1
The rubber stopper 2 with glass tube is filled in, two rubber stoppers 2 can make the inside of particle size part and external air pressure by intubation respectively
Source P1, P2 are connected.
The bridge circuit part is as shown in Fig. 2, be by two coils 3, the first fixed value resistance R1, the second fixed value resistance
R2 and AC power and voltmeter composition；The resistance value of first fixed value resistance R1 and the second fixed value resistance R2 are equal；
Wherein, two coils 3 of transducer body portion respectively with the first equivalent fixed value resistance R1, the second fixed value resistance
After R2 series connection, be connected in parallel on the both ends of AC power U, another group on corner node respectively with voltmeter (or other measuring instruments)
Both ends connect, and constitute bridge circuit.
The lucite tube 1 selects organic glass material because organic glass has, coefficient of thermal expansion is small, price just
Preferably, non-magnetic, the features such as moisture resistance is good, meet application demand.
Rubber stopper 2 is that butyl rubber is widely used in sealing, disclosure satisfy that biography because it has impermeability to air
The application demand of sensor.
The material selection copper wire of high intensity enamel covered wire circle 3, because of the electricalresistivityρ of copper wirecIt is smaller, the thermal losses of generation
It is few.
Annular permanent magnet 4 is circular ring shape, and material is neodymium iron boron N35.
Magnetic core 5 is cylinder, selects 1Cr13 materials (geneva stainless steel), relative permeability is about 2400, and output signal is bright
It is aobvious.
First permanent magnet 6 and the second permanent magnet 7 are cylinder, and material is neodymium iron boron N35, the two structure, material and
Attribute is identical.
Magnetic liquid 8 is the keryl Fe that volumetric concentration is 8%3O4Magnetic liquid, because magnetic liquid performance is stablized thus,
Saturation magnetization is high, disclosure satisfy that using needs.
Rubber hose 9 is the rubber mix glue pipes such as nitrile rubber and EPDM, and sealing effect is good, disclosure satisfy that sensing
The application requirement of device.
Use example：
Lucite tube 1 particle size part internal diameter 9mm, the long 100mm in particle size part, the long 6mm in thin footpath part, thin footpath bottom are long
10mm；Rubber stopper 2 is butyl rubber, can guarantee sealing；3 diameter 0.1mm of high intensity enamel covered wire circle, the number of turns are taken under room temperature
For 1000 circles, institute's galvanization is 0.17A, voltage 2.76V, frequency 1000Hz；Annular permanent magnet 4 selects NdFeB material N35, interior
Diameter 6mm, outer diameter 16mm, height 6mm；Magnetic core 5 diameter of section 8mm, height 47mm, cylindrical permanent magnet 6 and 7 select neodymium iron boron material
Material, diameter of section 8mm, length 2.5mm, totally four；Magnetic liquid 8 is keryl Fe3O4Magnetic liquid, viscosity 2.45Ps
S, saturation magnetization 23.4emu/g；Rubber hose 9 is the rubber mix glue pipes such as nitrile rubber and EPDM, is reached
Sealing effect.
The present invention occupation mode be：Lucite tube and its internal composite cores are put well vertically in horizontal experimental bench
Afterwards, left and right lucite tube is connected to hose, and connects circuit as shown in Figure 2.Respectively by two different pneumatic supplies with
The piston of left and right lucite tube connects, and the pressure difference of two pneumatic supplies is judged according to the output voltage of voltmeter.
Fig. 3 show the output voltage of magnetic-liquid micro differential pressure sensor and the relationship of micro-pressure-difference：When left and right organic glass
Pipe is there is no when pressure difference, under the action of left and right annular permanent magnet, be adsorbed with magnetic liquid left and right composite cores be located at it is left,
The inductance of the equilbrium position of right lucite tube, left and right coil is equal, and bridge circuit output voltage is zero (due to error etc.
0) output voltage values in Fig. 3 are approximately；When pressure source P1 at left lucite tube increases, left composite cores are to moving down
Dynamic, into left coil, while the air in left lucite tube can enter inside right lucite tube along rubber hose, make the right side
Composite cores are far from right coil.Since the relative permeability of magnetic core in composite cores is about 2400, the inductance of left coil is bright
Aobvious to increase, bridge circuit exports apparent positive voltage signal, as shown in Fig. 3 right half parts；When P1 reduces, left composite cores to
Upper movement, right composite cores move down, the opposite negative voltage signal of bridge circuit output symbol, as shown in Fig. 3 left-halfs.
From the figure 3, it may be seen that in a certain range, micro-pressure-difference meets linear relationship with differential voltage value, further can be by the electricity that measures
Pressure value calculates minute-pressure difference.
Unaccomplished matter of the present invention is known technology.
Claims (3)
1. a kind of magnetic-liquid micro differential pressure sensor of composite cores, it is characterized in that the sensor includes sensor main body and electric bridge
Circuit part；
Wherein, the sensor main body includes identical two parts, each section include lucite tube, rubber stopper, coil,
Annular permanent magnet, composite cores and magnetic liquid；Wherein, lucite tube includes particle size part and thin footpath part；Top it is thick
The top of path portion is plugged with rubber stopper, and inside middle portion is composite cores, and lower end outside is wound with coil；The both ends of composite cores are full
Be adsorbed with magnetic liquid；The thin footpath part of lower part is cased with annular permanent magnet；Thin footpath member base end is connected with hose, and hose will pass
Two parts of sensor main body are connected to；
The composite cores include magnetic core, the first permanent magnet and the second permanent magnet：Wherein, magnetic core is located in composite cores
Portion, the first permanent magnet and the second permanent magnet are adsorbed on the both ends of magnetic core, and the first permanent magnet and the second permanent magnet different name end respectively
Relatively；
Annular permanent magnet is opposite with permanent magnet Same Name of Ends；
First permanent magnet and the second permanent magnet are identical；The length of magnetic core is 15~20 times of the first permanent magnetism body length；Magnetic core
Diameter it is smaller 0.8~1.2mm than the diameter of lucite tube；
The diameter of first permanent magnet is more than/is equal to the diameter of magnetic core, and less than the internal diameter of lucite tube particle size part；
The bridge circuit portion includes two coils, the first fixed value resistance R1 and the second fixed value resistance R2 of sensor main body；
The resistance value of first fixed value resistance R1 and the second fixed value resistance R2 are equal；
Wherein, two coils of transducer body portion are gone here and there with the first equivalent fixed value resistance R1, the second fixed value resistance R2 respectively
After connection, the both ends of AC power U are connected in parallel on, another group connect the both ends respectively with measuring instrument on corner node, constitutes electric bridge
Circuit.
2. the magnetic-liquid micro differential pressure sensor of composite cores as described in claim 1, it is characterized in that the length of composite cores
It is the 45~55% of lucite tube particle size partial-length.
3. the magnetic-liquid micro differential pressure sensor of composite cores as described in claim 1, it is characterized in that the winding height of coil
For lucite tube particle size partial-length 22~27%.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN105547574B (en) | 2018-10-26 |
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| 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 |
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 | Little differential pressure sensor of magnetic fluid of compound magnetic core |
-
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 | Little differential pressure sensor of magnetic fluid of compound magnetic core |
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