CN110244075A - A kind of gear type magnetic fluid speed probe and preparation method thereof - Google Patents
A kind of gear type magnetic fluid speed probe and preparation method thereof Download PDFInfo
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- CN110244075A CN110244075A CN201910452822.6A CN201910452822A CN110244075A CN 110244075 A CN110244075 A CN 110244075A CN 201910452822 A CN201910452822 A CN 201910452822A CN 110244075 A CN110244075 A CN 110244075A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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Abstract
The invention discloses a kind of gear type magnetic fluid speed probe and preparation method thereof, shown gear type magnetic fluid speed probe includes: shell, gear, several induction electrodes and several magnetic sources；The shell has cavity, and the gear is arranged in the cavity and can rotate in the cavity；The induction electrode is arranged in the inner walls, has gap between the induction electrode and the increment of the gear, and the magnetic source is arranged in the inner walls and for providing magnetic field in the gap location；Magnetic fluid is filled in the cavity.Since gear type magnetic fluid speed probe structure of the invention is simple, compact, each section is relatively independent, maintains easily and overhauls.And utilize magnetic fluid self-characteristic, the tachometric survey being adapted under high speed rotation situation.
Description
Technical field
The present invention relates to sensor technical field more particularly to a kind of gear type magnetic fluid speed probe and its systems
Make method.
Background technique
Speed probe is a kind of sensor that the revolving speed of rotating object is converted to electricity output.Common revolution speed sensing
Device has photo-electric, condenser type, variable reluctance and tachometer generator etc..Speed probe is due to by directly passing in the prior art
Rotary state is passed to carry out tachometric survey, needs to manufacture Sensor core component using super micro-processing, be needed in production
Complicated microstructure, processing cost are generally also very high.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of gear type magnetic current
Body speed probe and preparation method thereof, it is intended to solve speed probe in the prior art microstructure complexity cause cost compared with
High problem.
The technical proposal for solving the technical problem of the invention is as follows:
A kind of gear type magnetic fluid speed probe, wherein comprising: shell, gear, several induction electrodes and several
Magnetic source；The shell has cavity, and the gear is arranged in the cavity and can rotate in the cavity；The induced electricity
Pole is arranged in the inner walls, has gap, the magnetic source setting between the induction electrode and the increment of the gear
In the inner walls and for providing magnetic field in the gap location；Magnetic fluid is filled in the cavity.
The gear type magnetic fluid speed probe, wherein the magnetic fluid includes several nonmagnetic conductive particles,
Several described nonmagnetic conductive particles connect the induction electrode and the gear for the self assembly in the magnetic field
Increment, the width in the gap are 10-10000 μm.
The gear type magnetic fluid speed probe, wherein the nonmagnetic conductive particle is nano-scale copper powder, nanometer
One of grade aluminium powder, nano-scale silver powder, nanoscale copper wire, nanoscale aluminum steel, nanoscale silver wire, fullerene are a variety of.
The gear type magnetic fluid speed probe, wherein the intensity in the magnetic field is greater than 0.1 tesla.
The gear type magnetic fluid speed probe, wherein be provided on the shell for detection magnetic fluid level
Magnetic fluid level probe.
The gear type magnetic fluid speed probe, wherein the gear is conical gear.
The gear type magnetic fluid speed probe, wherein described gear one end is interior by bearing and the shell
Wall is rotatablely connected, and the other end is provided with sprocket on the gear, and post holes is arranged on the shell, and the sprocket passes through described
Outside post holes to the cavity.
The gear type magnetic fluid speed probe, wherein sealing magnet is provided in the inner walls, it is described close
It seals magnet and surrounds the sprocket.
The gear type magnetic fluid speed probe, wherein the gear, the sprocket do not have magnetism and can
It is conductive.
A kind of production method based on gear type magnetic fluid speed probe described in above-mentioned any one, wherein it is wrapped
Include step:
Magnetic fluid is prepared according to nonmagnetic conductive particle；
The intensity in the position of induction electrode, the number of teeth of gear, the width in gap, magnetic field is set according to the revolving speed of gear.
The utility model has the advantages that gear type magnetic fluid speed probe structure of the invention is simple, compact, each section is relatively independent,
It maintains easily and overhauls.And utilize magnetic fluid self-characteristic, the tachometric survey being adapted under high speed rotation situation.
Detailed description of the invention
Fig. 1 is the partial sectional view of middle gear formula magnetic fluid speed probe of the present invention.
Fig. 2 is the cross-sectional view of middle gear formula magnetic fluid speed probe of the present invention.
Fig. 3 is the enlarged drawing in Fig. 2 at A.
Fig. 4 is the structural schematic diagram of middle gear formula magnetic fluid speed probe of the present invention.
Fig. 5 is the structural schematic diagram of middle gear and sprocket of the present invention.
Fig. 6 is the structural schematic diagram of lid in the present invention.
Fig. 7 is the structural schematic diagram of induction electrode in the present invention, magnetic source and output end.
Fig. 8 is structural schematic diagram of the nonmagnetic conductive particle in no externally-applied magnetic field in the present invention.
Fig. 9 is structural schematic diagram of the nonmagnetic conductive particle in vertical magnetic field in the present invention.
Figure 10 is photo of the nonmagnetic conductive particle in vertical magnetic field in the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Please refer to Fig. 1-Fig. 9, the present invention provides a kind of some preferable realities of gear type magnetic fluid speed probe
Apply example.
As depicted in figs. 1 and 2, gear type magnetic fluid speed probe of the invention include: shell 10, it is gear 20, several
A induction electrode 30 and several magnetic sources 40；The shell 10 has cavity, and the gear 20 is arranged in the cavity simultaneously
It can rotate in the cavity；The induction electrode 30 is arranged on 10 inner wall of shell, the induction electrode 30 with it is described
There is gap, the magnetic source 40 is arranged on 10 inner wall of shell and for mentioning in the gap location between the increment of gear 20
For magnetic field.
Specifically, it is provided with induction electrode mounting hole on the inner wall of the shell 10, induction electrode 30 is mounted on induced electricity
In the mounting hole of pole, the inductive head of induction electrode 30 stretches out outside induction electrode mounting hole, that is to say, that the inductive head of induction electrode 30
It extend into cavity.Magnetic fluid (not shown) is filled in the cavity.
The magnetic fluid includes several nonmagnetic conductive particles, several described nonmagnetic conductive particles are used for described
Self assembly in magnetic field and the increment for connecting the induction electrode 30 with the gear 20.
It is worth noting that needing to measure the revolving speed of gear 20 in the present invention.Due to the nonmagnetic conductive grain in magnetic fluid
Son is under certain magnetic fields, it may appear that along the progress self assembly of magnetic induction line direction to form chain structure, i.e., non magnetic to lead
Charged particle is arranged successively connection chaining.Gear 20 includes: several teeth 23 taking turns ontology 22 and being arranged on wheel ontology 22, phase
There is recess portion, the increment of gear 20 specifically refers to one of tooth 23 far from 20 center of gear (wheel ontology 22) here between adjacent tooth 23
End.
When gear 20 rotates, and tooth is opposite with induction electrode 30, the gap between increment and induction electrode 30 is smaller, non-
The both ends for the chain structure that magnetic conductive particle connects into are connected to the increment of induction machine and gear 20, realize induced electricity
The conducting of the increment of pole 30 and gear 20.When gear 20 rotates, and tooth 23 not with induction electrode 30 with respect to (i.e. recess portion and induced electricity
Pole 30 is opposite) when, induction electrode 30 at a distance from gear 20 farther out, the both ends for the chain structure that nonmagnetic conductive particle connects into
It can not be connected on induction electrode 30 and gear 20, certainly, the conducting that also just cannot achieve induction electrode 30 and gear 20 (is felt
Electrode 30 and gear 20 is answered to disconnect).The revolving speed for acquiring gear 20 can be calculated by the speed of 20 on-off of induction electrode 30 and gear.
Magnetic fluid be by nano-sized magnetic particles (magnetic particles, MPs, diameter about 10nm), base load liquid and
A kind of stable solution that dispersing agent three mixes.Compared with general fluid, magnetic fluid not only has the mobility of liquid,
And there is magnetization property, using the magnetization characteristic of magnetic fluid, the manipulation moved to magnetic fluid can be realized by externally-applied magnetic field.
Magnetic fluid containing non-magnetic particle is referred to as anti-magnetic fluid (inverse magnetic fluid).This is because non-
The size of magnetic-particle is much larger than the nano-sized magnetic particles in magnetic fluid, the interaction between non-magnetic particle and magnetic fluid
It can be regarded as the fluid structure interaction between solid phase particles and Newtonian fluid.Please refer to Fig. 8-Figure 10, there is externally-applied magnetic field
When, non-magnetic particle is by neighbouring magnetic fluid magnetic reversal and shows anisotropy.It is placed in magnetic fluid non magnetic a large amount of
When grain, there is dipolar forces due to magnetic moment between non-magnetic particle, this anisotropy makes non-magnetic particle in magnetic direction
It is assembled into chain structure.The energy for being assembled into non-magnetic particle after chain structure is lower, more stable.
In addition, using temperature-sensitive insulation magnetic fluid in the present invention, common temperature-sensitive insulation magnetic fluid has water base, oil base, ester group
With the magnetic fluids such as fluorine ether oil, specifically, base load liquid can select water, machine oil, hydroxyl oil, fluorine ether oil etc., and dispersing agent can use
Styrene or phosphate buffer, for keeping the uniform admixture of nonmagnetic conductive particle.Due to temperature-sensitive insulation magnetic fluid
Usually there is good thermal conductivity, gear type magnetic fluid speed probe has preferable heat dissipation performance.
For convenient for calculating, enabling the number of teeth of gear 20 is n, and there are many modes for the calculating of the revolving speed of gear 20: the first, working as setting
When one induction electrode 30, the time of detection induction electrode 30 and 20 on-off n times of gear is t1Second, then the revolving speed of gear 20 is n/
t1Revolutions per second.The second, when an induction electrode 30 is arranged, the time of detection induction electrode 30 on-off twice adjacent with gear 20
For t2Second, then the revolving speed of gear 20 is 1/t2Revolutions per second.Third, when two induction electrodes 30 are arranged, two 30 institutes of induction electrode
Pair central angle be α, detect some increment successively turn over the two induction electrodes 30 time be t3Second, then gear 20 turn
Speed is t3× 360 °/α revolutions per seconds.
Please refer to Fig. 1, Fig. 2 and Fig. 7, in presently preferred embodiments of the present invention, using an induction electrode 30 and one
A magnetic source 40, magnetic source 40 use permanent magnet or electromagnet.In order to preferably provide magnetic field for gap location, magnetic source 40 and gear 20
Increment is located at the two sides of induction electrode 30, that is to say, that magnetic source 40 also is located in induction electrode mounting hole, induction electrode 30
It is parallel with magnetic field line with the line of the increment of gear 20, convenient for nonmagnetic conductive particle is distributed along magnetic field line and connects induction electrode
30 with the increment of gear 20.
Several output ends 60 are provided on shell 10, output end 60 is connect with induction electrode 30, for exporting induced electricity
The current signal of pole 30.In presently preferred embodiments of the present invention, using an output end 60.
In a preferred embodiment of the present invention, the nonmagnetic conductive particle be nano-scale copper powder, nanoscale aluminium powder,
One of nano-scale silver powder, nanoscale copper wire, nanoscale aluminum steel, nanoscale silver wire, fullerene are a variety of.Specifically, certainly,
Nonmagnetic conductive particle is not limited to the above material, and the non magnetic of nonmagnetic conductive particle here refers to, relative to iron content, cobalt,
The substances such as nickel it is non magnetic.
In a preferred embodiment of the present invention, as shown in figure 3, the width δ in the gap is 10-10000 μm.Preferably
, the width δ in gap is 50-2000 μm.In particular it is required that the width δ in gap is arranged according to tachometric survey demand, due to non-magnetic
Property the length of chain structure that connects into of conducting particles it is related with the time, over time, the length of chain structure increases,
Certainly, chain structure can be also broken, and the connection and fracture of chain structure are a reversible processes, be reached after a certain period of time, chain
The connection and fracture of structure reach balance.Therefore, within the increment of gear 20 time opposite with induction electrode 30, chain structure
Require connect to certain length, it is sufficient to the increment of induction electrode 30 and gear 20 is connected more than the width δ in gap.Certainly it needs
The revolving speed of measurement is higher, then the width δ in gap is smaller；When the revolving speed for needing to measure is lower, then the width δ in gap can increase.
Certainly, it is also desirable to which the width δ that gap is determined according to the sensitive time, when needing to incude fast, then the width δ in gap is smaller, does not need
When incuding fast, then the width δ in gap can increase.
In a preferred embodiment of the present invention, the intensity in the magnetic field is greater than 0.1 tesla.Specifically, for water
For based magnetofluid, the magnetic field strength of permanent magnet should be greater than 0.2T(tesla), for oil-based magnetic fluids, the magnetic of permanent magnet
Field intensity should be greater than 0.1T(tesla).The intensity in magnetic field can control the length of chain structure, and magnetic field is stronger, and chain structure is got over
It is long；Magnetic field is weaker, and the length of chain structure is shorter.The intensity in magnetic field can be set according to tachometric survey demand.
In a preferred embodiment of the present invention, please refer to Fig. 1-Fig. 4, in order to ensure the amount of magnetic fluid is enough to survey
Examination, is provided with the magnetic fluid level probe 50 for detection magnetic fluid level on the shell 10.It specifically, can be in shell
Probe installing hole 14 is set on 10, and magnetic fluid level probe 50 is arranged in probe installing hole 14.Magnetic fluid level probe 50
One end is extend into cavity, and the other end protrudes from outside shell 10.In magnetic fluid deficiency, magnetic fluid level probe 50 is removed,
Magnetic fluid is supplemented by probe installing hole 14.
The setting position of probe installing hole 14, which can according to need, to be adjusted, in present pre-ferred embodiments, gear 20
In vertical rotation in surface, the top of 10 inner wall of shell is arranged in induction electrode 30, and the upper of shell 10 is arranged in probe installing hole 14
Surface will appear air at the top of cavity as long as magnetic fluid is insufficient, be visited when magnetic fluid is lower than certain altitude by magnetic fluid liquid level
Needle 50 detects.
In a preferred embodiment of the present invention, please refer to Fig. 2 and Fig. 5, the gear 20 is conical gear.Tool
Body, gear 20 can use roller gear or conical gear.The radial component of roller gear is too big, preferably, using circular cone
Gear is applicable to the measurement of the higher gear 20 of revolving speed.
In a preferred embodiment of the present invention, please refer to Fig. 2, Fig. 5 and Fig. 6, described 20 one end of gear is logical
The inner wall for crossing bearing 70 and the shell 10 is rotatablely connected, and the other end is provided with sprocket 21, the shell on the gear 20
Post holes 16 is set on 10, and the sprocket 21 passes through outside the post holes 16 to the cavity.When specifically, using conical gear,
The small end of conical gear is rotatablely connected by the inner wall of bearing 70 and shell 10, and big end is connect with sprocket 21.Bearing 70 can be with
It prevents gear 20 from sliding in the axial direction, and avoids gear 20 and contacted with shell 10 and generate friction.
In a preferred embodiment of the present invention, certainly, the gear 20, which can also be, is set on sprocket 21, tooth
21 one end of wheel post is rotatablely connected by the inner wall of bearing 70 and the shell 10, and the other end passes through the post holes 16 to the cavity
Outside, position of the adjustment gear 20 on sprocket 21 can change the width δ in gap.
Shell 10 includes: pedestal 11 and the lid connecting with pedestal 11 12；Flange 13 is provided on pedestal 11, flange 13 is set
It is equipped with screw hole, screw hole passes through for screw and fixes sensor.Post holes 16 is arranged on lid 12.
In a preferred embodiment of the present invention, the gear 20, the sprocket 21 do not have magnetic and can lead
Electricity.Specifically, gear 20 or sprocket 21 are made of non-magnetic conductive material, or are coated on non magnetic electrically non-conductive material
Conductive coating.The gear teeth can be manufactured by modes such as casting, gear shaping and welding.Input terminal is used as using sprocket 21, works as gear
When column 21 is rotated with moving gear 20, there is on-off in gear 20 and induction electrode 30, calculate turning for gear 20 by the number of on-off
Speed.The increment of gear 20 is plane, convenient for being connect with induction electrode 30 by nonmagnetic conductive particle.
In a preferred embodiment of the present invention, please refer to Fig. 1, Fig. 2 and Fig. 6, in order to avoid magnetic fluid
It reveals, sealing magnet 80 is provided on 10 inner wall of shell, the sealing magnet 80 surrounds the sprocket 21, namely sealing
Magnet 80 is arranged at 16 edge of post holes.Further, it is arranged fluted 15 on 10 inner wall of shell, specifically, groove 15 is arranged
On lid 12；Sealing magnet 80 be located in groove 15, seal magnet 80 at a distance from the opening of groove 15 be 0.02 to
0.2mm.The rheological characteristic of magnetic fluid is utilized in sealing magnet 80, and magnetic fluid is made to form the sealing film with solid phase property at sealing
To completely cut off external environment and prevent the internal leakage of sensor.Enclosed magnet uses permanent magnet, and common permanent magnet has neodymium iron
Boron permanent magnet, ferrite permanent-magnet iron.
The invention has the following advantages that (1) it is of the invention gear type magnetic fluid speed probe structure it is simple, it is compact, respectively
Part is relatively independent, maintains easily and overhauls；(2) gear type magnetic fluid speed probe of the invention have good interchangeability,
Modularization, seriation and quick Fabrication may be implemented；(3) gear type magnetic fluid speed probe of the invention to working environment without
Particular/special requirement can adapt to various particular surroundings；(4) present invention utilizes magnetic fluid self-characteristic, is adapted to high speed rotation
Tachometric survey under situation.(5) this sensor can be made small, in skill to the length dimension of sensitive zones without particular/special requirement
Under conditions of art allows, the gap of sensor cavity can be less than 50 μm.
The present invention also provides a kind of production based on gear type magnetic fluid speed probe described in above-mentioned any one
Method includes the following steps:
Step S100, magnetic fluid is prepared according to nonmagnetic conductive particle.
Specifically, the magnetic fluid of different base load liquid is selected to be hanged according to the physicochemical properties of non magnetic micro conductive particle
It floats and dissolves, since temperature-sensitive insulation magnetic fluid has good thermal diffusivity, generally commonly use temperature-sensitive insulation magnetic fluid, common temperature-sensitive is exhausted
Edge magnetic fluid has a magnetic fluids such as water base, oil base, ester group and fluorine ether oil, base load liquid can select water, machine oil, hydroxyl oil equal solvent into
Row is prepared, and needs to carry out experiment measurement after preparation, it is desirable that the self assembly efficiency that chain length is L is self-assembled into the case where designing magnetic field strength
Reach 80%.
Considering experimental fluid viscosity, pressure and economy select the magnetic fluids of the different intensity of magnetization, magnetic when selection
Change intensity is higher, and magnetic fluid solid property is more obvious, and the efficiency of self assembly also can be promoted significantly, while resistance caused by magnetic viscosity
Power can also increase considerably, and the factor of resistance caused by comprehensive consideration magnetic viscosity and self assembly efficiency is needed in production.
Step S200, the width in the position of induction electrode 30, the number of teeth of gear 20, gap is set according to the revolving speed of gear 20
δ, magnetic field intensity.
Specifically, S200 includes the following steps:
Step S210, according to the condition (such as: whether band is magnetic, and how is diameter of axle situation) and tachometric survey demand of the input terminal that tests the speed
To make the number of teeth of induction electrode 30, gear 20.
Specifically, the tooth of gear 20 should use symmetric design, and shape can make involute profile, rectangle tooth form, trapezoidal
Asymmetric design or incomplete tooth design also can be used in tooth form etc. in special circumstances.
Step S220, according to the size of the self assembly experiment production cavity in S100, and according to the installation of induction electrode 30
Position and tachometric survey demand make the modulus, the width δ in gap and the intensity in magnetic field of gear 20, further determine that gear
20 diameter and the model for selecting bearing 70, to determine 10 size of shell according to the width δ in gap.
The width δ in gap should by the self assembly in step S100 test be determined, while should also be as consider rotation because
Element, so the width δ in gap should be slightly less than experiment and measure self assembly chain structure length L, common value range be L/4 < δ <
L。
Step S230, according to the installation site of induction electrode 30 and the width δ in gap, magnetic fluid level probe is made
50。
Magnetic fluid level probe 50 is needed using non magnetic electrically non-conductive material, and bottom should be lower than induction electrode 30, quasi-
Sensor should be stood a period of time at detection magnetic fluid level position, to prevent by the increment that should be higher than that gear 20 with scale
The magnetic fluid splashing stirred is rotated to have an impact liquid level position detection.
Step S240, shell 10 is made according to installation environment and position dimension, shell 10 include: pedestal 11 and with pedestal 11
The lid 12 of connection successively installs induction electrode 30, magnetic source 40, bearing 70, gear 20, magnetic current body fluid in sensor base 11
Position probe 50, and check mutually to whether there is and interfere.
Step S250, lid 12 is made according to 11 size of sensor base, needs to make groove 15 on lid 12 and is used for
Permanent magnet is installed, the magnetic fluid for being mixed with nonmagnetic conductive particle prepared is filled by the mounting hole of magnetic fluid level probe 50
Enter into the cavity that tests the speed and tests its anti-leak characteristic.
The gap there are 0.02 to 0.2 millimeter is needed between permanent magnet and the opening of groove 15.
Step S260, it after first assembly, needs to carry out energization test experiments, guarantees the validity of assembly.
In conclusion the present invention provides a kind of gear type magnetic fluid speed probe and preparation method thereof, shown gear
Formula magnetic fluid speed probe includes: shell, gear, several induction electrodes and several magnetic sources；The shell has chamber
Body, the gear are arranged in the cavity and can rotate in the cavity；The induction electrode is arranged in the shell
On wall, there is gap between the induction electrode and the increment of the gear, the magnetic source is arranged in the inner walls simultaneously
For providing magnetic field in the gap location；It is filled with magnetic fluid in the cavity, the magnetic fluid includes that several non magnetic are led
Charged particle, several described nonmagnetic conductive particles be used in the magnetic field self assembly and connect the induction electrode with it is described
The increment of gear.Since gear type magnetic fluid speed probe structure of the invention is simple, compact, each section is relatively independent, side
Just it safeguards and overhauls.And utilize magnetic fluid self-characteristic, the tachometric survey being adapted under high speed rotation situation.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of gear type magnetic fluid speed probe, characterized in that it comprises: shell, gear, several induction electrodes with
And several magnetic sources；The shell has cavity, and the gear is arranged in the cavity and can rotate in the cavity；Institute
It states induction electrode to be arranged in the inner walls, there is gap between the induction electrode and the increment of the gear, it is described
Magnetic source is arranged in the inner walls and for providing magnetic field in the gap location；Magnetic fluid is filled in the cavity.
2. gear type magnetic fluid speed probe according to claim 1, which is characterized in that the magnetic fluid includes several
A nonmagnetic conductive particle, several described nonmagnetic conductive particles are used for the self assembly in the magnetic field and connect the induction
The increment of electrode and the gear, the width in the gap are 10-10000 μm.
3. gear type magnetic fluid speed probe according to claim 2, which is characterized in that the nonmagnetic conductive particle
For in nano-scale copper powder, nanoscale aluminium powder, nano-scale silver powder, nanoscale copper wire, nanoscale aluminum steel, nanoscale silver wire, fullerene
It is one or more.
4. gear type magnetic fluid speed probe according to claim 1, which is characterized in that the intensity in the magnetic field is greater than
0.1 tesla.
5. gear type magnetic fluid speed probe according to claim 1, which is characterized in that be arranged on the shell useful
In the magnetic fluid level probe of detection magnetic fluid level.
6. gear type magnetic fluid speed probe according to claim 1, which is characterized in that the gear is circular cone tooth
Wheel.
7. gear type magnetic fluid speed probe according to claim 1, which is characterized in that described gear one end passes through axis
It holds and is rotatablely connected with the inner wall of the shell, the other end is provided with sprocket on the gear, and post holes, institute are arranged on the shell
Sprocket is stated outside the post holes to the cavity.
8. gear type magnetic fluid speed probe according to claim 7, which is characterized in that be arranged in the inner walls
There is sealing magnet, the sealing magnet surrounds the sprocket.
9. gear type magnetic fluid speed probe according to claim 7, which is characterized in that the gear, the gear
Column does not have magnetic and electrically conductive.
10. a kind of production method based on gear type magnetic fluid speed probe described in any one of claim 1-9, special
Sign is comprising step:
Magnetic fluid is prepared according to nonmagnetic conductive particle；
The intensity in the position of induction electrode, the number of teeth of gear, the width in gap, magnetic field is set according to the revolving speed of gear.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910452822.6A CN110244075B (en) | 2019-05-28 | 2019-05-28 | Gear type magnetic fluid rotating speed sensor and manufacturing method thereof |
| PCT/CN2020/082862 WO2020238405A1 (en) | 2019-05-28 | 2020-04-02 | Gear-type magnetic fluid-based rotational speed sensor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910452822.6A CN110244075B (en) | 2019-05-28 | 2019-05-28 | Gear type magnetic fluid rotating speed sensor and manufacturing method thereof |
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| CN110244075A true CN110244075A (en) | 2019-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020238405A1 (en) * | 2019-05-28 | 2020-12-03 | 南方科技大学 | Gear-type magnetic fluid-based rotational speed sensor and manufacturing method thereof |
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| CN114646774B (en) * | 2021-04-02 | 2024-02-13 | 无锡未科精密技术有限公司 | Portable rotation tester |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110244075B (en) | 2023-08-29 |
| WO2020238405A1 (en) | 2020-12-03 |
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