CN104515718B - Magnetic liquid magnetizes viscosity determining procedure and device - Google Patents
Magnetic liquid magnetizes viscosity determining procedure and device Download PDFInfo
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- CN104515718B CN104515718B CN201310463664.7A CN201310463664A CN104515718B CN 104515718 B CN104515718 B CN 104515718B CN 201310463664 A CN201310463664 A CN 201310463664A CN 104515718 B CN104515718 B CN 104515718B
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Abstract
A kind of magnetic liquid magnetization viscosity determining procedure and device, magnetic source is made using permanent-magnetic clamp, confining magnetic field is by weak to strongly continuous adjustable, by permanent-magnetic clamp in interior magnetic conduction stator, moved up and down in the cavity that outer magnetic conduction stator and magnetic conduction rotor are surrounded, so that upper pole shoe ring and magnetic conduction rotor, two radially adjustable gaps are formed between interior magnetic conduction stator, composition magnetizes loop and leakage field loop, and then adjust the magnetic field intensity being applied on magnetic liquid material, starting to rotate by magnetic conduction rotor after buncher is sheared magnetic liquid material, viscosity characteristicses are converted to shearing force and determined in moment of torsion M forms by torsion-testing apparatus；Magnetic flux is measured by magnetic-flux measurement device, finally magnetization viscosity and logical magnetic density is calculated by formula.Low-intensity magnetic field of the present invention be adjustable to level off to zero level, and small to the rotor inertia of magnetic liquid formation shear action, the radius of gyration is big, easy to adjust, and the measurement of curve is glued more suitable for the viscosity-temperature curve and magnetic of magnetic liquid under the conditions of low temperature, low-intensity magnetic field.
Description
Technical field
The present invention relates to magnetic liquid and the method for testing and device of magnetic rheological body viscosity, especially in magnetic field magnetization
Under magnetic liquid or magnetic rheological body material magnetization viscosity determining procedure and device.
Background technology
Magnetic liquid and magnetic rheological body material are to be stably dispersed in by magnetic particle by surfactant in certain carrier fluid
And the magnetic solid-liquid two-phase functional material of tool generated, the characteristic such as its configuration, microstructure and viscosity is by externally-applied magnetic field
Constraint and control, in the many-side such as sealing, damping vibration attenuation, electromagnetism filter logical, high-quality sound equipment, sensing, braking with very wide
General application prospect.The viscosity characteristicses research of magnetic liquid and magnetic rheological body in magnetic field and under different temperatures is even more important, and is
The basis of its application study.When externally-applied magnetic field is less than certain critical value, the Blang of magnetic particle in magnetic liquid or magnetic rheological body
Warm-up movement is occupied an leading position, and is not susceptible to chain sequence, and the viscosity characteristicses of integral material are identical with common fluid；But additional
Under strong magnetic field action, magnetic liquid and magnetic rheological body material show extremely strong magnetization viscosity building characteristic, and this magnetization thickening
Characteristic is relevant with magnetizing time.Magnetize viscosity building characteristic be beneficial for functions such as damping vibration attenuation, brakings, but for sealing with
The functions such as high-quality sound equipment are harmful.Therefore need to determine the viscosity under its different temperatures with applied field strengths and time
Change curve, to determine the operating fields of different magnetic liquid or magnetic rheological body materials, and is the devices such as sealing and damping vibration attenuation
Optimization design provide foundation.
Common fluid viscosity method of testing is unsuitable for the test of the magnetization viscosity of magnetic liquid and magnetic rheological body material.One
Aspect is on existing viscosity testing device, it is impossible to convenient to apply high-intensity magnetic field to it, even being applied with external magnetic field, and some lean on gravity
The viscosimeter of effect can not also be used, because magnetic force can be more than the effect of gravity.The liquid that another aspect commonsense method needs every time
Body sample size is larger.
The survey for the magnetic liquid apparent viscosity that Chinese patent application Publication No. CN1737531A and CN2802498Y are provided
Method for testing using the close magnetism-collected structure of magnetic fluid sealing, by increase or decrease the quantity of permanent magnet blocks in magnetism-collected structure come
The intensity of additional confining magnetic field is controlled, does so and on the one hand changes permanent magnets inconvenience, the change of another aspect confining magnetic field every time
Change is discontinuous, it is impossible to the critical operating fields of Accurate Determining, while the patent does not also provide the measure side of operating fields intensity
Method.The assay method provided in Chinese patent CN2099316U is one kind improvement in conventional motion viscosity determining procedure, although
Permanent magnetism instead of using electromagnetism, the consecutive variations of externally-applied magnetic field are realized, but be difficult reach in a long time and maintain compared with
High magnetic field intensity, and substantial amounts of fluid sample is needed when testing every time and more electric energy, particularly magnet coil is expended
Substantial amounts of heat can operationally be produced, it is difficult to control the temperature of sample, low temperature magnetization viscosity characteristicses especially relatively difficult to achieve
Measure.
Further, Chinese Patent Application No. provides for ZL201010290643.6 a kind of makees magnetic source, constraint magnetic using permanent magnet
The magnetic liquid and the magnetization viscosity determining procedure and device of magnetic rheological body of field continuously adjustabe, mainly determine ring, magnetic conduction by magnetic conduction and move
Ring, permanent-magnetic clamp and pole shoe ring and constant clearance and adjustable clearance constitute loop of magnetizing, magnetic conduction rotating ring and magnetic conduction determine ring pass through it is upper
Lower continuous dislocation adjusts the size of adjustable clearance, makes adjustable magnetic resistance, so as to adjust the magnetic flux of magnetic loop, and then adjusts
The magnetic field intensity on magnetic liquid or magnetic rheological body material sample is applied in whole constant clearance；Realize the additional magnetic of magnetic liquid
The continuously adjustabe of field, test device is small to the consumption of material sample, and will not produce influence, easy to use, work(to sample temperature
Consumption is small.But magnetized loop using the design only one of which, high-intensity magnetic field can only be applied to magnetic liquid sample, it is impossible to make magnetic loop
On magnetic flux or the magnetic field intensity that puts in constant clearance be reduced to a relatively weak level；The revolution of constant clearance
Radius is too small, but rotor inertia is excessive, does not make full use of structure space；And during adjustable clearance regulation, although constant clearance
It is constant, but its clearance plane is with respect to the changing of the relative positions, can so cause support of the magnetic liquid on clearance plane to move phenomenon.
The content of the invention
First technical problem to be solved by this invention is to provide one kind and makees magnetic source, confining magnetic field by weak using permanent magnet
To strongly continuous adjustable magnetic liquid magnetization viscosity determining procedure, its low-intensity magnetic field be adjustable to level off to zero level, and to magnetic
Property liquid formation shear action rotor inertia it is small, the radius of gyration is big, easy to adjust, is particularly suitable for low temperature, weak magnetic field condition
The viscosity-temperature curve and magnetic of magnetic liquid glue the measurement of curve.
Second technical problem to be solved by this invention is to provide a kind of magnetic liquid magnetization viscosity test device, uses
Permanent magnet makees magnetic source, is designed with magnetize loop and leakage field loop, can confining magnetic field by weak to strongly continuous adjustable, its low-intensity magnetic field is adjustable
Save to level off to zero level, and small to the rotor inertia of magnetic liquid formation shear action, the radius of gyration is big, easy to adjust,
The viscosity-temperature curve and magnetic for being particularly suitable for magnetic liquid under the conditions of low temperature, low-intensity magnetic field glue the measurement of curve.
The present invention solve technical scheme that above-mentioned first technical problem used for：A kind of magnetic liquid magnetization viscosity is surveyed
Method for testing, it is characterised in that comprise the following steps：
1) the axial constant gap of magnetic liquid magnetization viscosity test device is set as δ, axial constant gap center radius
For R, the face of cylinder in axial constant gap is highly h；
2) magnetic liquid material is injected by pipeline in the axial constant gap for magnetizing viscosity test device in magnetic liquid
Sample；
3) upper pole shoe ring and magnetic conduction are adjusted with respect to continuous moving above and below rotating shaft work by permanent-magnetic clamp and its upper and lower pole shoe ring
The second radially adjustable gap between the first radially adjustable gap and upper pole shoe ring and interior magnetic conduction stator between rotor, and then
The magnetic flux of magnetic loop is adjusted, and then adjusts the magnetic field intensity being applied in axial constant gap on magnetic liquid material, when
When being moved on in upper pole shoe ring close to the position of magnetic conduction rotor, the magnetic in main magnetic conduction, axial constant gap is played in loop of magnetizing
Field becomes strong；When upper pole shoe ring is moved down into close to interior magnetic conduction stator, leakage field loop is served in main magnetic conduction, axial constant gap
Magnetic field die down, and level off to zero；
4) start buncher, drive magnetic conduction rotor to rotate by moment of torsion and device for testing rotating speed, rotating shaft, make axial constant
Magnetic liquid material in gap is by shear action, and the viscosity characteristicses of material sample are converted to shearing force and with moment of torsion M shape
Formula is determined by torsion-testing apparatus；
5) the magnetization viscosities il for obtaining magnetic liquid material sample is calculated by following equation (I),
Wherein
η is that material sample magnetizes viscosity, and δ is axial constant gap length, and R=r+ δ/2 are axial constant gap center half
Footpath, r is magnetic conduction rotor radius, and h is axial constant gap garden cylinder height, and ω is magnetic conduction rotating ring rotational angular velocity, and M is dynamic for magnetic conduction
Ring driving torque, τ is shear stress suffered by material sample,For velocity gradient, F is twisting resistance, and A is constant clearance cylinder area.
Further, also measured by the external magnetic-flux measurement device of electromagnetic induction coil by the magnetic in axial constant gap
Flux φ, the magnetic flux density B in axial constant gap is calculated by following equation (II)：
B is constant axial gap flux density, and φ is the total magnetic flux on magnetic loop, and N is number of inductive coil turns, φtFor
Fluxmeter measured value.
The present invention solve technical scheme that above-mentioned second technical problem used for：A kind of magnetic liquid magnetization viscosity is surveyed
Trial assembly is put, including buncher, supporting rotating shaft within the bearing and the moment of torsion and device for testing rotating speed being connected in rotating shaft, its
It is characterised by：Being connected with from the inside to the outside by fastener in the rotating shaft can turn with axis of rotation without magnetic centering rotor and magnetic conduction
Son, interior magnetic conduction stator and outer magnetic conduction stator are determined by bearing and magnetic conduction rotor and rotating shaft concentric locating, interior magnetic conduction stator, outer magnetic conduction
It is provided with the cavity that son and magnetic conduction rotor are surrounded above and below the permanent-magnetic clamp that can make to move up and down relative to rotating shaft, permanent-magnetic clamp
Two ends are respectively arranged with upper and lower pole shoe ring, and the axial direction of the tested magnetic liquid of injection is formed between outer magnetic conduction stator and magnetic conduction rotor
Constant clearance, forms the first radially adjustable gap, between upper pole shoe ring and interior magnetic conduction stator between upper pole shoe ring and magnetic conduction rotor
Form the second radially adjustable gap, permanent-magnetic clamp and its upper and lower pole shoe ring and outer magnetic conduction stator, magnetic conduction rotor, constant clearance and the
One radially adjustable gap constitutes loop of magnetizing together；Permanent-magnetic clamp and its upper and lower pole shoe ring and interior magnetic conduction stator and its second radial direction
Adjustable clearance constitutes leakage field loop together；And it is provided with electromagnetic induction on outer magnetic conduction stator inner wall, close to the position of magnetic conduction rotor
Coil.
As an improvement, the upper end of the rotating shaft is provided with a step, described be set in without magnetic centering rotor on step surface passes through
Fastener is connected with rotating shaft, and the magnetic conduction rotor is fixed on the outside of no magnetic centering rotor.
As an improvement, the bearing is arranged at the lower end of rotating shaft by inner bearing fastener, the interior magnetic conduction stator and outer
Magnetic conduction stator is referred to by bearing with magnetic conduction rotor and rotating shaft concentric locating：The lower end of the outer magnetic conduction stator is tight by outer bearing
Firmware connects with the lower end of bearing, and interior magnetic conduction stator fixation is fixed in outer magnetic conduction stator with the periphery of bearing.
Improve again, interior driving screw thread is provided between the interior magnetic conduction stator and lower pole shoe ring, the permanent-magnetic clamp is by rotating
Interior driving screw thread, which is realized, to be moved up and down.
Improve again, outer driving screw thread is provided between the outer magnetic conduction stator and lower pole shoe ring, the permanent-magnetic clamp is by rotating
Outer driving screw thread, which is realized, to be moved up and down.
Further improve, the bottom of the lower pole shoe ring is connected with hydraulic-driven connecting rod, and hydraulic-driven connecting rod passes through hydraulic pressure
The hydraulic pressure formed in unit, upper hydraulic cavities, lower hydraulic pressure chamber forms upper and lower driving force, when hydraulic oil is pumped into down from upper hydraulic cavities
During hydraulic cavities, drive link is moved upwards, and when hydraulic oil is pumped into upper hydraulic cavities from lower hydraulic pressure chamber, drive link is moved downward,
Permanent-magnetic clamp is realized under the drive of drive link and moved up and down.
Compared with prior art, the advantage of the invention is that：Magnetic source is made using permanent magnet, it is fixed in interior magnetic conduction by permanent magnet
Moved up and down in the cavity that sub, outer magnetic conduction stator and magnetic conduction rotor are surrounded so that upper pole shoe ring and magnetic conduction rotor and interior lead
Two radially adjustable gaps are formed between magnetic stator, composition magnetizes loop and leakage field loop, magnetic liquid confining magnetic field by it is weak extremely
It is strongly continuous adjustable, its low-intensity magnetic field be adjustable to level off to zero level, and to magnetic liquid formation shear action rotor inertia
Small, the radius of gyration is big, easy to adjust, more suitable for the viscosity-temperature curve of magnetic liquid, magnetic under the conditions of low temperature, low-intensity magnetic field glue curve and
Viscosity with stand magnetizing time change curve measurement.
Brief description of the drawings
Fig. 1 is the structural representation of the test device of the embodiment of the present invention 1；
Fig. 2 is the relevant position figure of each parameter of magnetic loop of the present invention；
Fig. 3 is the structural representation of the test device of the embodiment of the present invention 2；
Fig. 4 is the structural representation of the test device of the embodiment of the present invention 3
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
A kind of magnetic liquid magnetization viscosity determining procedure of the present invention, comprises the following steps：
1) the axial constant gap of magnetic liquid magnetization viscosity test device is set as δ, axial constant gap center radius
For R, the face of cylinder in axial constant gap is highly h；
2) magnetic liquid material is injected by pipeline in the axial constant gap for magnetizing viscosity test device in magnetic liquid
Sample, untill filling；
3) upper pole shoe ring and magnetic conduction are adjusted with respect to continuous moving above and below rotating shaft work by permanent-magnetic clamp and its upper and lower pole shoe ring
The second radially adjustable gap between the first radially adjustable gap and upper pole shoe ring and interior magnetic conduction stator between rotor, and then
The magnetic flux of magnetic loop is adjusted, and then adjusts the magnetic field intensity being applied in axial constant gap on magnetic liquid material, when
When being moved on in upper pole shoe ring close to the position of magnetic conduction rotor, the magnetic in main magnetic conduction, axial constant gap is played in loop of magnetizing
Field becomes strong；When upper pole shoe ring is moved down into close to interior magnetic conduction stator, leakage field loop is served in main magnetic conduction, axial constant gap
Magnetic field die down, and level off to zero；
4) start buncher, drive magnetic conduction rotor to rotate by moment of torsion and device for testing rotating speed, rotating shaft, make axial constant
Magnetic liquid material in gap is by shear action, and the viscosity characteristicses of material sample are converted to shearing force and with moment of torsion M shape
Formula is determined by torsion-testing apparatus；
5) the magnetization viscosities il for obtaining magnetic liquid material sample is calculated by following equation (I),
Wherein
η is that material sample magnetizes viscosity, and δ is axial constant gap length, and R=r+ δ/2 are axial constant gap center half
Footpath, r is magnetic conduction rotor radius, and h is axial constant gap garden cylinder height, and ω is magnetic conduction rotating ring rotational angular velocity, and M is dynamic for magnetic conduction
Ring driving torque, τ is shear stress suffered by material sample,For velocity gradient, F is twisting resistance, and A is constant clearance cylinder area.
6) by the external magnetic-flux measurement device of electromagnetic induction coil, measure by the magnetic flux in axial constant gap,
The magnetic flux density B in axial constant gap is calculated by following equation (II)：
B is constant axial gap flux density, and φ is the total magnetic flux on magnetic loop, and N is number of inductive coil turns, φtFor
Fluxmeter measured value.
Embodiment 1
The magnetic liquid magnetization viscosity test device of the present embodiment, including magnetic conduction rotor 1, outer magnetic conduction stator 2, electromagnetic induction
Coil 3, upper pole shoe ring 4, permanent-magnetic clamp 5, lower pole shoe ring 6, magnetic liquid 9, moment of torsion and device for testing rotating speed 10, buncher 11,
Without magnetic centering rotor 12, rotating shaft 13, the part such as bearing 15 and its firm part is constituted, and wherein moment of torsion is connected with device for testing rotating speed 10
In the upper end of rotating shaft 13, the upper end moment of torsion of rotating shaft 13 is provided with a step, no magnetic centering rotor with the lower section of device for testing rotating speed 10
12 are set on step surface and are connected by fastener with rotating shaft 13, and magnetic conduction rotor 1 is fixed on the outer of no magnetic centering rotor 12
Side；Interior magnetic conduction stator 17 and outer magnetic conduction stator 2 pass through bearing 15 and magnetic conduction rotor 1 and the concentric locating of rotating shaft 13, interior magnetic conduction stator
17th, the permanent magnetism that can make to move up and down relative to rotating shaft 13 is provided with the cavity that outer magnetic conduction stator 2 and magnetic conduction rotor 1 are surrounded
Ring 5, the upper and lower ends of permanent-magnetic clamp 5 are respectively arranged with pole shoe ring 4, lower pole shoe ring 6, between outer magnetic conduction stator 2 and magnetic conduction rotor 1
The axial constant gap delta of the tested magnetic liquid 9 of injection is formed, first is formed between upper pole shoe ring 4 and magnetic conduction rotor 1 radially adjustable
Gap g2, forms the second radially adjustable gap g3, thereon permanent-magnetic clamp 5 and pole shoe ring between upper pole shoe ring 4 and interior magnetic conduction stator 17
4th, lower pole shoe ring 6 is constituted together with outer magnetic conduction stator 2, magnetic conduction rotor 1, axial constant gap delta and the first radially adjustable gap g2
Magnetize loop 7；Permanent-magnetic clamp 5 and thereon pole shoe ring 4, the lower pole shoe ring 6 and radially adjustable gap g3 of interior magnetic conduction stator 17 and its second
Leakage field loop 8 is constituted together；And it is provided with electromagnetic induction coil 3 on the outer inwall of magnetic conduction stator 2, close to the position of magnetic conduction rotor 1.
Bearing 15 is arranged at the lower end of rotating shaft 13, interior magnetic conduction stator 17 and outer magnetic conduction stator 2 by inner bearing fastener 14
Referred to by bearing 15 with magnetic conduction rotor 1 and the concentric locating of rotating shaft 13：The lower end of outer magnetic conduction stator 2 passes through outer bearing fastener 16
Connect with the lower end of bearing 15, the periphery that interior magnetic conduction stator 17 fixes with bearing 15 in outer magnetic conduction stator 2 is fixed；Interior magnetic conduction is determined
Provided with interior driving screw thread 18 between son 17 and lower pole shoe ring 6, permanent-magnetic clamp 5 is realized by driving screw thread 18 in rotation and moved up and down.
Operation principle is：Permanent-magnetic clamp 5 and thereon pole shoe ring 4, lower pole shoe ring 6 and outer magnetic conduction stator 2, magnetic conduction rotor 1, axial direction
The radially adjustable gap g2 of constant clearance δ and first constitute loop 7 of magnetizing；Permanent-magnetic clamp 5 and thereon pole shoe ring 4, lower pole shoe ring 6 with it is interior
The radially adjustable gap g3 of magnetic conduction stator 17 and its second constitutes leakage field loop 8 together.When permanent-magnetic clamp 5 and pole shoe ring 4, lower pole thereon
Boots ring 6 by rotating in driving screw thread 18 when moving up and down, magnetic field intensity in axial constant gap delta by consecutive variations, when
When being moved on in upper pole shoe ring 4 close to the position of magnetic conduction rotor 1, loop 7 of magnetizing is served in main magnetic conduction, axial constant gap delta
Magnetic field become strong；When upper pole shoe ring 4 is moved down into close to interior magnetic conduction stator 17, main magnetic conduction is played in leakage field loop 8, axially permanent
Magnetic field in fixed gap δ dies down, and levels off to zero.Buncher 11 is driven by moment of torsion with device for testing rotating speed 10, rotating shaft 13
Magnetic conduction rotor 1 is rotated, and makes the magnetic liquid material sample 9 in axial constant gap delta by shear action, magnetic liquid material 9
Viscosity characteristicses be converted to shearing force F and determined in the form of moment of torsion M by torsion-testing apparatus, magnetic liquid is obtained by public formula (I)
The viscosities il of body material sample；The external magnetic-flux measurement device of electromagnetic induction coil 3, for measuring by axial constant gap delta
Magnetic flux, the magnetic flux density B in axial constant gap delta is calculated by formula 2.
Embodiment 2
As shown in figure 3, difference from Example 1 is, outer drive is set between outer magnetic conduction stator 2 and lower pole shoe ring 6
Screw thread 180, the outer driving screw thread realization determine by rotating outer magnetic conduction between ring and lower pole shoe ring go up pole shoe ring 4, permanent-magnetic clamp 5 and under
Pole shoe ring 6 is moved up and down, so as to realize the consecutive variations of magnetic field intensity in axial constant gap delta.
Embodiment 3
As shown in figure 4, with embodiment 1 and embodiment 2 except that lower pole shoe ring 6 and the phase of hydraulic-driven connecting rod 19
Connection, the hydraulic pressure that hydraulic-driven connecting rod 19 is formed by hydraulic pressure unit 20, upper hydraulic cavities 21, in lower hydraulic pressure chamber 22 formed,
Lower driving force, when hydraulic oil is pumped into lower hydraulic pressure chamber 22 from upper hydraulic cavities 21, drive link 19 is moved upwards, when hydraulic oil is under
When hydraulic cavities 22 are pumped into hydraulic cavities 21, drive link 19 is moved downward, drive link 19 drive upper pole shoe ring 4, permanent-magnetic clamp 5,
Lower pole shoe ring 6 moves up and down, so as to realize the consecutive variations of magnetic field intensity in axial constant gap delta.
Claims (8)
1. a kind of magnetic liquid magnetizes viscosity determining procedure, it is characterised in that comprise the following steps：
1) the axial constant gap of magnetic liquid magnetization viscosity test device is set as δ, and axial constant gap center radius is R,
The face of cylinder in axial constant gap is highly h；
2) magnetic liquid material sample is injected by pipeline in the axial constant gap for magnetizing viscosity test device in magnetic liquid；
3) upper pole shoe ring and magnetic conduction rotor are adjusted with respect to continuous moving above and below rotating shaft work by permanent-magnetic clamp and its upper and lower pole shoe ring
Between the first radially adjustable gap and upper pole shoe ring and interior magnetic conduction stator between the second radially adjustable gap, and then adjust
The magnetic flux of magnetic loop, and then the magnetic field intensity being applied in axial constant gap on magnetic liquid material is adjusted, when upper pole
When being moved on on boots ring close to the position of magnetic conduction rotor, the magnetic field that loop of magnetizing is served in main magnetic conduction, axial constant gap becomes
By force；When upper pole shoe ring is moved down into close to interior magnetic conduction stator, the magnetic in main magnetic conduction, axial constant gap is played in leakage field loop
Die down, and level off to zero；
4) start buncher, drive magnetic conduction rotor to rotate by moment of torsion and device for testing rotating speed, rotating shaft, make axial constant gap
Interior magnetic liquid material is converted to shearing force and the quilt in the form of moment of torsion M by shear action, the viscosity characteristicses of material sample
Torsion-testing apparatus is determined；
5) the magnetization viscosities il for obtaining magnetic liquid material sample is calculated by following equation (I),
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<mi>&tau;</mi>
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<mi>&delta;</mi>
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</mtd>
</mtr>
<mtr>
<mtd>
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<mi>M</mi>
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<mn>2</mn>
</msup>
<mi>h</mi>
</mrow>
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<mi>R</mi>
<mi>&omega;</mi>
<mo>/</mo>
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</mfrac>
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</mtd>
</mtr>
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<mo>=</mo>
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<mrow>
<mi>M</mi>
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Wherein
η is that material sample magnetizes viscosity, and δ is axial constant gap length, and R=r+ δ/2 are axial constant gap center radius, r
For magnetic conduction rotor radius, h is axial constant gap garden cylinder height, and ω is magnetic conduction rotating ring rotational angular velocity, and M is that magnetic conduction rotating ring turns
Dynamic torque, τ is shear stress suffered by material sample,For velocity gradient, F is twisting resistance, and A is constant clearance cylinder area；
The magnetic liquid magnetizes viscosity test device, including buncher, supporting rotating shaft within the bearing and being connected to turns
Being connected with from the inside to the outside by fastener in moment of torsion and device for testing rotating speed on axle, the rotating shaft can be with axis of rotation without magnetic
Centering rotor and magnetic conduction rotor, interior magnetic conduction stator and outer magnetic conduction stator are interior by bearing and magnetic conduction rotor and rotating shaft concentric locating
Being provided with the cavity that magnetic conduction stator, outer magnetic conduction stator and magnetic conduction rotor are surrounded can make to move up and down forever relative to rotating shaft
Magnet ring, the upper and lower ends of permanent-magnetic clamp are respectively arranged with upper and lower pole shoe ring, and injection quilt is formed between outer magnetic conduction stator and magnetic conduction rotor
The axial constant gap of magnetic liquid is surveyed, the first radially adjustable gap, upper pole shoe ring are formed between upper pole shoe ring and magnetic conduction rotor
The second radially adjustable gap is formed between interior magnetic conduction stator, permanent-magnetic clamp and its upper and lower pole shoe ring turn with outer magnetic conduction stator, magnetic conduction
Son, constant clearance and the first radially adjustable gap constitute loop of magnetizing together；Permanent-magnetic clamp and its upper and lower pole shoe ring are determined with interior magnetic conduction
Son and its second radially adjustable gap constitute leakage field loop together；And on outer magnetic conduction stator inner wall, close to the position of magnetic conduction rotor
Electromagnetic induction coil is installed.
2. magnetic liquid magnetizes viscosity determining procedure according to claim 1, it is characterised in that step also includes：
By the external magnetic-flux measurement device of electromagnetic induction coil, measure by the magnetic flux in the axial constant gap, warp
Cross following equation (II) and calculate magnetic flux density B in axial constant gap：
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<mi>B</mi>
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<mi>A</mi>
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<mi>&phi;</mi>
<mi>t</mi>
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<mi>&pi;</mi>
<mi>N</mi>
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B is constant axial gap flux density, and φ is the total magnetic flux on magnetic loop, and N is number of inductive coil turns, φtFor fluxmeter
Measured value.
3. a kind of magnetic liquid for described in claim 1 magnetizes the device of viscosity determining procedure, including buncher, supporting
Rotating shaft within the bearing and the moment of torsion and device for testing rotating speed being connected in rotating shaft, it is characterised in that：Pass through in the rotating shaft
Fastener is connected with from the inside to the outside can be with axis of rotation without magnetic centering rotor and magnetic conduction rotor, and interior magnetic conduction stator and outer magnetic conduction are determined
The sky that son is surrounded by bearing and magnetic conduction rotor and rotating shaft concentric locating, interior magnetic conduction stator, outer magnetic conduction stator and magnetic conduction rotor
Intracavitary is provided with the permanent-magnetic clamp that can make to move up and down relative to rotating shaft, and the upper and lower ends of permanent-magnetic clamp are respectively arranged with upper and lower pole shoe
Ring, forms the axial constant gap of the tested magnetic liquid of injection, upper pole shoe ring and magnetic conduction between outer magnetic conduction stator and magnetic conduction rotor
The first radially adjustable gap is formed between rotor, the second radially adjustable gap is formed between upper pole shoe ring and interior magnetic conduction stator, forever
Magnet ring and its upper and lower pole shoe ring are constituted together with outer magnetic conduction stator, magnetic conduction rotor, constant clearance and the first radially adjustable gap fills
Magnetic loop；Permanent-magnetic clamp and its upper and lower pole shoe ring constitute leakage field loop together with interior magnetic conduction stator and its second radially adjustable gap；
And it is provided with electromagnetic induction coil on outer magnetic conduction stator inner wall, close to the position of magnetic conduction rotor.
4. device according to claim 3, it is characterised in that：The upper end of the rotating shaft is provided with a step, described fixed without magnetic
Heart rotor is set on step surface to be connected by fastener with rotating shaft, and the magnetic conduction rotor is fixed on no magnetic centering rotor
Outside.
5. device according to claim 3, it is characterised in that：The bearing is arranged at rotating shaft by inner bearing fastener
Lower end, the interior magnetic conduction stator and outer magnetic conduction stator are referred to by bearing with magnetic conduction rotor and rotating shaft concentric locating：Led outside described
The lower end of magnetic stator is connected by outer bearing fastener with the lower end of bearing, and interior magnetic conduction stator fixation is in outer magnetic conduction stator and axle
The periphery held is fixed.
6. the device according to claim 3 or 4 or 5, it is characterised in that：Set between the interior magnetic conduction stator and lower pole shoe ring
There is interior driving screw thread, the permanent-magnetic clamp is moved up and down by rotating interior driving screw thread realization.
7. device according to claim 3, it is characterised in that：Driven between the outer magnetic conduction stator and lower pole shoe ring provided with outer
Dynamic screw thread, the permanent-magnetic clamp is moved up and down by rotating outer driving screw thread realization.
8. the device according to claim 3 or 4 or 5, it is characterised in that：The bottom of the lower pole shoe ring is connected with hydraulic pressure drive
Dynamic connecting rod, hydraulic-driven connecting rod forms upper and lower driving by the hydraulic pressure formed in hydraulic pressure unit, upper hydraulic cavities, lower hydraulic pressure chamber
Power, when hydraulic oil is pumped into lower hydraulic pressure chamber from upper hydraulic cavities, drive link is moved upwards, when hydraulic oil is pumped into from lower hydraulic pressure chamber
During hydraulic cavities, drive link is moved downward, and permanent-magnetic clamp is realized under the drive of drive link and moved up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310463664.7A CN104515718B (en) | 2013-09-30 | 2013-09-30 | Magnetic liquid magnetizes viscosity determining procedure and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN112577853A (en) * | 2021-02-26 | 2021-03-30 | 湖南工匠实创智能机器有限责任公司 | Method for measuring viscosity of magnetic liquid |
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| TWI567392B (en) * | 2015-11-03 | 2017-01-21 | 宇能電科技股份有限公司 | Motion and environment sensors by using magnetic sensing schemes |
| CN109357972B (en) * | 2018-12-14 | 2023-11-21 | 沈阳建筑大学 | Cross plate type magnetorheological fluid viscosity measuring device and measuring method |
| CN112525769B (en) * | 2020-11-09 | 2023-12-26 | 长江大学 | Adjustable externally-applied axial magnetic field experimental device and application method thereof |
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