CN210427619U - Immersed magnetic fluid rotating speed measuring device - Google Patents
Immersed magnetic fluid rotating speed measuring device Download PDFInfo
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- CN210427619U CN210427619U CN201920783044.4U CN201920783044U CN210427619U CN 210427619 U CN210427619 U CN 210427619U CN 201920783044 U CN201920783044 U CN 201920783044U CN 210427619 U CN210427619 U CN 210427619U
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Abstract
The utility model discloses an submergence formula magnetic current body rotational speed measuring device, submergence formula magnetic current body rotational speed measuring device includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a magnetic rotor positioned in the shell; an induction electrode is arranged on the magnetic rotor, is opposite to the input electrode and has a gap with the input electrode; and a magnetic fluid is filled between the shell and the magnetic rotor. The non-magnetic conductive particles can be rapidly self-assembled in the magnetic field, so that the speed measurement detection efficiency is improved, the range of the magnetic field formed by the magnetic rotor is large, a short chain structure is formed in advance, a long chain structure can be rapidly formed, the speed measurement detection efficiency is further improved, and the test time is shortened.
Description
Technical Field
The utility model relates to a rotational speed measuring device technical field especially relates to an submergence formula magnetic current body rotational speed measuring device.
Background
The commonly used rotating speed measuring devices include photoelectric type, capacitance type, variable reluctance type, tachogenerator and the like. In the prior art, the rotating speed is measured by directly transmitting the rotating state, but the measuring time of the rotating speed measured by directly transmitting the rotating state is long.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide an submergence formula magnetic current body rotational speed measuring device, aim at solving the long problem of rotational speed measuring device measuring time among the prior art.
The utility model provides a technical scheme that technical problem adopted as follows:
an immersed magnetic fluid rotational speed measuring device, wherein, it includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a magnetic rotor positioned in the shell; the magnetic rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the magnetic rotor, induction electrodes are arranged on the magnetic rotor, and gaps are formed between the induction electrodes and the input electrodes and opposite to the input electrodes; and a magnetic fluid is filled between the shell and the magnetic rotor.
The immersed magnetic fluid rotating speed measuring device, wherein the magnetic rotor comprises: the rotor comprises a rotor body and a magnetic cylinder sleeved outside the rotor body.
The immersed magnetic fluid rotating speed measuring device is characterized in that a shaft hole is formed in the shell, and a speed measuring shaft for driving the magnetic rotor to rotate is arranged in the shaft hole; one end of the speed measuring shaft is connected with the rotor body, and the other end of the speed measuring shaft penetrates through the shaft hole and extends out of the shell.
The immersed magnetic fluid rotating speed measuring device is characterized in that two baffles are arranged on the inner wall of the shell, and the two baffles are respectively positioned at two axial ends of the magnetic rotor.
The immersed magnetic fluid rotating speed measuring device is characterized in that a sealing magnet is arranged on the edge of the shaft hole, and the sealing magnet surrounds the speed measuring shaft.
The immersed magnetic fluid rotating speed measuring device is characterized in that the speed measuring shaft is non-magnetic and non-conductive.
The immersed magnetic fluid rotating speed measuring device is characterized in that the magnetic fluid comprises a plurality of nonmagnetic conductive particles, the nonmagnetic conductive particles are used for self-assembling in a magnetic field of the magnetic rotor to connect the induction electrode and the input electrode, and the width of the gap is 10-600 mu m.
The immersed magnetic fluid rotating speed measuring device is characterized in that the nonmagnetic conductive particles are one or more of nanoscale copper powder, nanoscale aluminum powder, nanoscale silver powder, nanoscale copper wires, nanoscale aluminum wires, nanoscale silver wires and fullerene.
The immersed magnetic fluid rotating speed measuring device is characterized in that the intensity of the magnetic field is greater than 0.1 Tesla.
Has the advantages that: the non-magnetic conductive particles can be rapidly self-assembled in the magnetic field, so that the speed measurement detection efficiency is improved, the time is saved, the range of the magnetic field formed by the magnetic rotor is large, the magnetic fluid can form a short chain structure in advance, and when the induction electrode is opposite to the input electrode, the short chain structure can rapidly form a long chain structure, so that the conduction of the induction electrode and the input electrode is realized, the speed measurement detection efficiency is further improved, and the test time is shortened.
Drawings
Fig. 1 is a cross-sectional view of the immersed magnetofluid rotation speed measuring device of the present invention.
Fig. 2 is a cross-sectional view of the immersed magnetic fluid rotation speed measuring device of the present invention.
Fig. 3 is a schematic structural diagram of the middle base and the input electrode of the present invention.
Fig. 4 is a schematic structural view of the magnetic rotor of the present invention.
Fig. 5 is a schematic structural diagram of the non-magnetic conductive particles in the absence of an external magnetic field.
Fig. 6 is a schematic structural diagram of the non-magnetic conductive particles in the vertical magnetic field according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-6, the present invention provides some preferred embodiments of an immersed magnetic fluid rotation speed measuring device.
As shown in fig. 1 and fig. 2, the immersed magnetic fluid rotation speed measuring device of the present invention includes: the device comprises a shell 10, a plurality of input electrodes 30 arranged on the inner wall of the shell 10 and a magnetic rotor 20 positioned in the shell 10; a cavity for measuring speed is formed in the housing 10, the magnetic rotor 20 can rotate in the housing 10 (i.e. the cavity), the plurality of input electrodes 30 are arranged at intervals along the rotation direction of the magnetic rotor 20, the magnetic rotor 20 is provided with induction electrodes 21, and the induction electrodes 21 are opposite to the input electrodes 30 and have gaps with the input electrodes 30; a magnetic fluid is filled between the housing 10 and the magnetic rotor 20, that is, the magnetic fluid is filled in the cavity, and the magnetic rotor 20 is immersed in the magnetic fluid.
The magnetic fluid includes a number of non-magnetic conductive particles for self-assembly in the magnetic field of the magnetic rotor 20 to connect the induction electrode 21 and the input electrode 30.
It is worth mentioning that the present invention requires measuring the rotation speed of the magnetic rotor 20. Under the action of a certain magnetic field, the non-magnetic conductive particles in the magnetic fluid are self-assembled along the direction of the magnetic induction line to form a chain structure, namely, the non-magnetic conductive particles are sequentially arranged and connected into a chain. The magnetic rotor 20 includes: the rotor comprises a rotor body and a magnetic cylinder sleeved outside the rotor body; specifically, the induction electrode 21 is provided on the magnetic cylinder. The number of the induction electrodes 21 is one in the present embodiment, but may be plural.
The input electrode 30 is attached to the inner wall of the casing 10, and the input electrode 30 is externally connected with an input power end of the test circuit. The input electrodes 30 are arranged at intervals, when the magnetic rotor 20 rotates and the induction electrode 21 is opposite to the input electrodes 30, the distance between the induction electrode 21 and the input electrodes 30 is small, and two ends of a chain structure formed by connecting the nonmagnetic conductive particles are respectively connected to the input electrodes 30 and the induction electrodes 21, so that the input electrodes 30 and the magnetic rotor 20 are conducted. When the magnetic rotor 20 rotates and the sensing electrode 21 does not face the input electrode 30 (i.e. the sensing electrode 21 faces the position between two adjacent input electrodes 30), the sensing electrode 21 is far away from the input electrode 30, two ends of the chain structure formed by connecting the non-magnetic conductive particles cannot be connected to the sensing electrode 21 and the input electrode 30, and certainly, the sensing electrode 21 cannot be connected to the input electrode 30 (i.e. the sensing electrode 21 is disconnected from the input electrode 30). The speed of the current pulse of the induction electrode 21 and the input electrode 30 can be used for calculating the rotating speed of the magnetic rotor 20.
The non-magnetic conductive particles can be rapidly self-assembled in the magnetic field, so that the speed measurement detection efficiency is improved, the time is saved, the range of the magnetic field formed by the magnetic rotor 20 is large, the non-magnetic conductive particles can form a short chain structure in advance, and when the induction electrode 21 is opposite to the input electrode 30, the short chain structure can rapidly form a long chain structure, so that the conduction of the induction electrode 21 and the input electrode 30 is realized, the speed measurement detection efficiency is further improved, and the test time is shortened.
The magnetic fluid is a stable solution formed by mixing nano-scale magnetic particles (MPs, the diameter of which is about 10nm), base carrier liquid and dispersing agent. Compared with the common fluid, the magnetic fluid not only has the liquidity of the liquid, but also has the magnetization performance, and the control on the movement of the magnetic fluid can be realized through an external magnetic field by utilizing the magnetization characteristic of the magnetic fluid.
The magnetic fluid containing the nonmagnetic particles is called a reverse magnetic fluid (nonmagnetic fluid). This is because the size of the non-magnetic particles is much larger than the nano-scale magnetic particles in the magnetic fluid, and the interaction between the non-magnetic particles and the magnetic fluid can be regarded as fluid-solid coupling between solid phase particles and newtonian fluid. Referring to fig. 5-6, in the presence of an applied magnetic field, the non-magnetic particles are magnetized in opposite directions by the magnetic fluid in the vicinity and exhibit anisotropy. When a large number of nonmagnetic particles are placed in the magnetic fluid, dipole force exists among the nonmagnetic particles due to magnetic moments, and the nonmagnetic particles are assembled into a chain-shaped structure in the direction of a magnetic field due to the anisotropy. The non-magnetic particles assembled into the chain structure have lower energy and are more stable.
Furthermore, the utility model discloses in adopt temperature sensing insulating magnetic fluid, common temperature sensing insulating magnetic fluid has magnetic fluid such as water base, oil base, ester and fluoroether oil, and specifically, the base carrier fluid can select water, machine oil, hydroxyl group oil, fluoroether oil etc. and the dispersant can adopt styrene or phosphate buffer solution for keep non-magnetic conductive particle's homogeneous mixing state. Because the temperature-sensing insulating magnetic fluid generally has good thermal conductivity, the immersed magnetic fluid rotating speed measuring device has good heat dissipation performance.
For convenience of calculation, let the number of input electrodes 30 be n, the rotation speed of the magnetic rotor 20 can be calculated in various ways: first, when a sensing electrode 21 is provided, the time for detecting n current pulses of the sensing electrode 21 and the input electrode 30 is t1Second, the rotation speed of the magnetic rotor 20 is n/t1Revolutions per second. Secondly, when one sensing electrode 21 is provided, the time for detecting two adjacent current pulses of the sensing electrode 21 and the input electrode 30 is t2Second, the rotation speed of the magnetic rotor 20 is 1/t2Third, when two sensing electrodes 21 are provided, it is necessary to consider that the central angle of the pair of the two sensing electrodes 21 is α, and the time t for detecting that one of the input electrodes 30 sequentially faces the two sensing electrodes 21 is t3Second, the rotation speed of the magnetic rotor 20 is t3X 360 °/α rev/s.
Referring to fig. 1 and fig. 2, in a preferred embodiment of the present invention, the magnetic rotor 20 includes: a rotor body and a magnetic cylinder (not shown in the figure) sleeved outside the rotor body. The magnetic cylinder adopts a permanent magnet or an electromagnet. In order to better provide the magnetic field, the line connecting the inductive electrode 21 and the input electrode 30 is parallel to the magnetic field lines, i.e. the direction of the magnetic field lines is along the radial direction of the magnetic rotor 20, so that the non-magnetic conductive particles are distributed along the magnetic field lines to connect the inductive electrode 21 and the input electrode 30.
The housing 10 includes: a base 11 and a cover 12 connected to the base 11; the base 11 is provided with a flange 13 and a bottom plate 14, the flange 13 is perpendicular to the bottom plate 14, and the bottom plate 14 is provided with a screw hole for a screw to pass through and fix the rotating speed measuring device.
In a preferred embodiment of the present invention, the casing 10 is provided with a shaft hole 111, the shaft hole 111 is disposed at the bottom of the base 11, and a speed measuring shaft for driving the magnetic rotor 20 to rotate is disposed in the shaft hole 111; one end of the speed measuring shaft is connected with the rotor body, and the other end of the speed measuring shaft penetrates through the shaft hole 111 and extends out of the shell. The speed measuring shaft is used for being connected with a measured object, and the speed measuring shaft can be connected with the measured object through a coupler.
As shown in fig. 4, a through hole 201 is provided on the rotor body for the speed measuring shaft to pass through, and the speed measuring shaft is connected with the rotor body through a key 23. The key 23 is mainly used to connect and transmit the rotary motion between the tachometer shaft and the magnetic rotor. Specifically, be provided with first half groove 202 on the through-hole 201 inner wall, be provided with the half groove of second on the axle outer wall that tests the speed, first half groove 202 makes up into the keyway with the half groove of second, and key 23 is located the keyway. The rotor body is connected with the speed measuring shaft through the key 23, the speed measuring shaft is convenient to replace, namely, the rotating shaft of the measured object can also be used as the speed measuring shaft and is connected with the rotor body.
In a preferred embodiment of the present invention, the inner wall of the housing 10 is provided with a baffle 40, and the baffle 40 is divided into two parts, which are respectively located at two axial ends of the magnetic rotor 20. The baffle 40 is mainly used for adjusting the relative positions of the sensing electrode 21 and the input electrode 30, and ensuring the alignment of the sensing electrode 21 and the input electrode 30. Specifically, the two are a shaft shoulder baffle plate 41 and a shaft end baffle plate 42, the shaft shoulder baffle plate 41 is annular and is sleeved on the speed measuring shaft, and the shaft end baffle plate 42 is located at the end of the speed measuring shaft and is circular.
In a preferred embodiment of the present invention, please refer to fig. 1, fig. 2 and fig. 3, in order to avoid the leakage of the magnetic fluid, the sealing magnet 50 is disposed at the edge of the shaft hole 111, the sealing magnet 50 surrounds the speed measuring shaft, and of course, the sealing magnet 50 is disposed on the inner wall of the housing 10. Further, a groove is provided on the inner wall of the housing 10, specifically, the groove is provided on the base 11; the sealing magnet 50 is located in the recess, and the distance between the sealing magnet 50 and the opening of the recess is 0.02 to 0.2 mm. The sealing magnet 50 makes use of the rheological property of the magnetic fluid to form a sealing film having solid phase property at the sealing portion of the magnetic fluid to isolate the external environment and prevent the internal leakage of the rotation speed measuring apparatus. The sealing magnet 50 is a permanent magnet, and commonly used permanent magnets include neodymium iron boron permanent magnet and ferrite permanent magnet. The permanent magnet should be magnetized in the radial direction.
In a preferred embodiment of the present invention, the non-magnetic conductive particles are one or more of nano-copper powder, nano-aluminum powder, nano-silver powder, nano-copper wire, nano-aluminum wire, nano-silver wire, and fullerene. Specifically, of course, the nonmagnetic conductive particles are not limited to the above materials, and the nonmagnetic property of the nonmagnetic conductive particles herein means a nonmagnetic property with respect to a substance containing iron, cobalt, nickel, or the like.
In a preferred embodiment of the invention, the width of the gap is 10-600 μm. Preferably, the width of the gap is 50-100 μm. Specifically, the width of the gap needs to be set according to the requirement of rotating speed measurement, and since the length of the chain structure formed by connecting the nonmagnetic conductive particles is related to time, the length of the chain structure increases with the passage of time, and certainly, the chain structure is also broken, the connection and the breakage of the chain structure are a reversible process, and after a certain time, the connection and the breakage of the chain structure reach balance. Therefore, the chain structure needs to be connected to a length enough to exceed the width of the gap to connect the induction electrode 21 and the tooth end of the magnetic rotor 20 during the time when the tooth end of the magnetic rotor 20 is opposed to the induction electrode 21. Of course, the higher the rotation speed to be measured, the smaller the width of the gap; the width of the gap may be increased when the rotational speed to be measured is lower. Of course, the width of the gap also needs to be determined according to the sensing time, and when the sensing is required to be fast, the width of the gap is smaller, and when the sensing is not required to be fast, the width of the gap can be increased.
In a preferred embodiment of the present invention, the strength of the magnetic field is greater than 0.1 tesla. Specifically, the magnetic field strength of the permanent magnet should be greater than 0.2T (Tesla) for water-based magnetic fluids and greater than 0.1T (Tesla) for oil-based magnetic fluids. The strength of the magnetic field can control the length of the chain-shaped structure, and the stronger the magnetic field, the longer the chain-shaped structure; the weaker the magnetic field, the shorter the length of the chain-like structure. The strength of the magnetic field can be set according to the requirement of rotating speed measurement.
In a preferred embodiment of the present invention, the speed measuring shaft is non-magnetic and non-conductive. Specifically, the speed measuring shaft is made of a non-magnetic non-conducting material, and a ferromagnetic material cannot be used, so that the magnetic field distribution condition of the magnetic fluid rotating speed measuring device is not influenced; or the surface of the tachometer shaft is plated with a lead layer although a conductive material is adopted. When the shaft diameter of the rotating shaft of the measured object is proper and nonmagnetic, the rotating shaft can be directly connected with the rotor body through the key 23 to measure the speed; when the shaft to be measured has weak magnetism and the shaft diameter is smaller or thicker, the shaft coupling is required to be connected to the speed measuring shaft.
The utility model has the advantages of it is following: (1) the non-magnetic conductive particles can be rapidly self-assembled in the magnetic field, so that the speed measurement detection efficiency is improved, the time is saved, the range of the magnetic field formed by the magnetic rotor 20 is large, the non-magnetic conductive particles can form a short chain structure in advance, and when the induction electrode 21 is opposite to the input electrode 30, the short chain structure can rapidly form a long chain structure, so that the conduction of the induction electrode 21 and the input electrode 30 is realized, the speed measurement detection efficiency is further improved, and the test time is shortened. (2) The immersed magnetic fluid rotating speed measuring device has simple and compact structure, each part is relatively independent, and the maintenance and the overhaul are convenient; (3) the immersed magnetofluid rotating speed measuring device has good interchangeability, and can realize modularization, serialization and rapid manufacture; (4) the immersed magnetofluid rotating speed measuring device of the utility model has no special requirements on the working environment and can adapt to various special environments; (5) the utility model discloses utilize magnetic fluid self characteristic, can adapt to the rotational speed measurement under the high-speed rotatory situation. (6) The rotating speed measuring device has no special requirement on the length size of a speed measuring area, can be made very small, and the gap of the cavity of the rotating speed measuring device can be smaller than 50 mu m under the condition allowed by the technology.
Immersion type magnetic fluid rotating speed measuring device adopt the following method to make:
and S100, preparing magnetic fluid according to the nonmagnetic conductive particles.
Specifically, magnetic fluids of different base carrier liquids are selected for suspension dissolution according to the physicochemical properties of the non-magnetic micro-conductive particles, the temperature-sensitive insulating magnetic fluid has good heat dissipation performance, the temperature-sensitive insulating magnetic fluid is generally commonly used, the commonly used temperature-sensitive insulating magnetic fluid comprises magnetic fluids such as water base, oil base, ester base, fluoroether oil and the like, the base carrier liquid can be prepared by solvents such as water, engine oil, hydroxy oil and the like, experimental measurement is needed after preparation, and the self-assembly efficiency of self-assembly with the chain length L under the designed magnetic field intensity is required to reach 80%.
The magnetic fluid with different magnetization intensities is selected by comprehensively considering the viscosity, pressure and economy of the experimental fluid during selection, the higher the magnetization intensity is, the more obvious the solid characteristics of the magnetic fluid are, the self-assembly efficiency can be greatly improved, meanwhile, the resistance caused by the magnetic viscosity can be greatly increased, and the factors of the resistance caused by the magnetic viscosity and the self-assembly efficiency need to be comprehensively considered during manufacturing.
Step S200 is to set the position of the input electrode 30, the number of the input electrodes 30, the width of the gap, and the strength of the magnetic field according to the rotation speed of the magnetic rotor 20.
Specifically, step S200 includes the steps of:
step S210, manufacturing a tachometer shaft, a key 23 and a magnetic rotor with an induction electrode 21 according to the conditions of the tachometer input end (such as whether the tachometer input end is magnetic or not and the shaft diameter condition) and the requirement of rotating speed measurement.
Step S220, manufacturing the size of the cavity according to the self-assembly experiment in step S100, and manufacturing 30 input electrodes N on the inner surface of the base 11 according to the size of the tachometer cavity and the requirement of the rotation speed measurement.
Step S230, manufacturing the base 11 according to the installation environment and the position size, obtaining the gap size delta of the tachometer cavity through the inner diameter size of the base 11, installing the induction electrode 21 on the inner surface of the base 11, and adjusting the relative position between the input electrode 30 on the inner surface of the base 11 and the induction electrode 21 on the magnetic rotor through the thickness of the shaft shoulder baffle 41.
The width of the gap should be determined by the self-assembly experiment in step S100, and the rotation factor should be considered, so the width of the gap should be slightly smaller than the length L of the self-assembly chain structure measured by the experiment, and the value range is L/4< δ < L.
After sizing, preliminary static and dynamic balance calculations should be performed to balance the additional disturbances caused by uneven loading on the shaft.
Step S240, installing the key 23, the shoulder baffle 41, the shaft end baffle 42 and the magnetic rotor with the input electrode 30 on the tachometer shaft according to the corresponding test position of the input electrode 30 on the magnetic rotor and the induction electrode 21.
The symmetrical arrangement of the input electrodes 30 is usually adopted for the measurement of the uniform rotating speed, and the asymmetrical arrangement of the input electrodes 30 is often adopted according to the actual requirement when variable acceleration exists for the rotating speed, only partial rotating angle is concerned, or reciprocating rotation exists.
Step S250, manufacturing the cover body 12 and the sealed permanent magnet according to the size of the base 11, sequentially installing the sealed magnet, the magnetic rotor and the speed measuring shaft matched in the step S240 on the base 11, filling the prepared ferrofluid mixed with the non-magnetic conductive particles into the speed measuring cavity, installing the cover body 12 and testing the leakage-proof property of the cover body.
And step S260, after initial assembly, carrying out an electrification test experiment to ensure the effectiveness of assembly.
To sum up, the utility model provides an submergence formula magnetic current body rotational speed measuring device, submergence formula magnetic current body rotational speed measuring device includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a magnetic rotor positioned in the shell; the magnetic rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the magnetic rotor, induction electrodes are arranged on the magnetic rotor, and gaps are formed between the induction electrodes and the input electrodes and opposite to the input electrodes; and a magnetic fluid is filled between the shell and the magnetic rotor and comprises a plurality of non-magnetic conductive particles, and the plurality of non-magnetic conductive particles are used for self-assembling in a magnetic field of the magnetic rotor to connect the induction electrode and the input electrode. The non-magnetic conductive particles can be rapidly self-assembled in the magnetic field, so that the speed measurement detection efficiency is improved, the time is saved, the range of the magnetic field formed by the magnetic rotor is large, the non-magnetic conductive particles can form a short chain structure in advance, and when the induction electrode is opposite to the input electrode, the short chain structure can rapidly form a long chain structure, so that the conduction of the induction electrode and the input electrode is realized, the speed measurement detection efficiency is further improved, and the test time is shortened.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. An immersed magnetic fluid rotating speed measuring device is characterized by comprising: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a magnetic rotor positioned in the shell; the magnetic rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the magnetic rotor, induction electrodes are arranged on the magnetic rotor, and gaps are formed between the induction electrodes and the input electrodes and opposite to the input electrodes; and a magnetic fluid is filled between the shell and the magnetic rotor.
2. The immersed magnetic fluid rotational speed measurement device according to claim 1, wherein the magnetic rotor comprises: the rotor comprises a rotor body and a magnetic cylinder sleeved outside the rotor body.
3. The immersed magnetofluid rotating speed measuring device according to claim 2, wherein the housing is provided with a shaft hole, and a speed measuring shaft for driving the magnetic rotor to rotate is arranged in the shaft hole; one end of the speed measuring shaft is connected with the rotor body, and the other end of the speed measuring shaft penetrates through the shaft hole and extends out of the shell.
4. The immersed magnetic fluid rotation speed measuring device according to claim 3, wherein two baffles are arranged on the inner wall of the shell, and the two baffles are respectively positioned at two axial ends of the magnetic rotor.
5. The immersed magnetic fluid rotation speed measuring device according to claim 3, wherein the shaft hole edge is provided with a sealing magnet, and the sealing magnet surrounds the tachometer shaft.
6. An immersed magnetic fluid rotational speed measuring device according to claim 5 wherein the tachometer shaft is non-magnetic and non-conductive.
7. An immersed magnetic fluid rotation speed measuring device according to claim 1, wherein the magnetic fluid comprises a plurality of non-magnetic conductive particles for self-assembly in the magnetic field of the magnetic rotor to connect the induction electrode and the input electrode, and the gap has a width of 10-600 μm.
8. The device for measuring the rotational speed of the immersed magnetic fluid according to claim 7, wherein the non-magnetic conductive particles are one or more of nano-copper powder, nano-aluminum powder, nano-silver powder, nano-copper wire, nano-aluminum wire, nano-silver wire and fullerene.
9. An immersed magnetic fluid rotational speed measurement device according to claim 7 wherein the strength of the magnetic field is greater than 0.1 tesla.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221093A (en) * | 2019-05-28 | 2019-09-10 | 南方科技大学 | A kind of immersion magnetic fluid rotation-speed measuring device and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221093A (en) * | 2019-05-28 | 2019-09-10 | 南方科技大学 | A kind of immersion magnetic fluid rotation-speed measuring device and preparation method thereof |
| CN110221093B (en) * | 2019-05-28 | 2024-04-02 | 南方科技大学 | Immersed magnetic fluid rotating speed measuring device and manufacturing method thereof |
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