CN100573154C - Magnetic fluid acceleration transducer - Google Patents

Magnetic fluid acceleration transducer Download PDF

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Publication number
CN100573154C
CN100573154C CNB2007100639918A CN200710063991A CN100573154C CN 100573154 C CN100573154 C CN 100573154C CN B2007100639918 A CNB2007100639918 A CN B2007100639918A CN 200710063991 A CN200710063991 A CN 200710063991A CN 100573154 C CN100573154 C CN 100573154C
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China
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magnetic
mass
housing
acceleration transducer
magnetic fluid
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CNB2007100639918A
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CN101246183A (en
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刘桂雄
邱东勇
曹东
程韬波
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

Magnetic fluid acceleration transducer of the present invention comprises that non-magnetic housing is the closed container that is made of nonmagnetic substance; Mass is located at the non-magnetic housing middle part, is provided with pick-up unit between the surface of contact of both ends of the surface and non-magnetic housing, and keeps the preload pressure of setting between mass, pick-up unit and non-magnetic housing; And be full of magnetic fluid in the cavity that non-magnetic housing and mass form; Pick-up unit is used to detect the variation of pressure between mass and the non-magnetic housing, output acceleration detection consequential signal.Have characteristics such as wide range, range controllability, high sensitivity, high reliability, intelligent, long working life.

Description

Magnetic fluid acceleration transducer
Technical field
The present invention relates to the production and the application of acceleration transducer, relate in particular to a kind of acceleration transducer based on magnetic fluid.
Background technology
At present, all commonly used in many technical fields to acceleration transducer, as motor racing control, building machinery motion control, mechanical vibration detection, space flight and aviation, household appliances Performance Detection or the like.
Existing acceleration transducer has following several structure usually.
A kind of acceleration transducer is to adopt cantilever beam structure, comprises stiff end and is arranged on the semi-girder of doing reciprocal elastic deformation motion on the substrate, determines extraneous acceleration magnitude by the mode that detects the semi-girder position.Detection mode commonly used is provided with that an end is fixed, the free-moving semi-girder of the other end, pastes foil gauge at the root of semi-girder, detects the shift value of semi-girder root by foil gauge, thereby determines extraneous input acceleration.
Another kind of acceleration transducer is that steel ball is placed in the housing with the state that moves freely, according to the mechanicalness vibration that applies from the outside, steel ball relatively moves, then the switch sections that designs by predetermined configurations according to this displacement produces on-off output, and this structure mainly is used as a kind of acceleration switch.
Above-mentioned acceleration transducer all has the little characteristics of rigidity, arrives the ultimate value of measurement range in the acceleration analysis process easily, and once making the material that the back just can not change acceleration transducer inside, these all are their shortcomings.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of acceleration transducer, be based on the acceleration transducer of magnetic fluid, have characteristics such as wide range, range controllability, high sensitivity, high reliability, intelligent, long working life.
The objective of the invention is to be achieved through the following technical solutions:
A kind of magnetic fluid acceleration transducer comprises: non-magnetic housing, mass, pick-up unit and magnetic fluid, wherein:
Non-magnetic housing: the closed container that constitutes by nonmagnetic substance;
Mass: be located at the non-magnetic housing middle part, be provided with pick-up unit between the surface of contact of both ends of the surface and non-magnetic housing, and between mass, pick-up unit and non-magnetic housing, keep the preload pressure of setting; And be full of magnetic fluid in the cavity that non-magnetic housing and mass form;
Pick-up unit: be used to detect the variation of pressure between mass and the non-magnetic housing, output acceleration detection consequential signal.
Described magnetic fluid acceleration transducer also comprises the magnetic field control device, is used to change the viscosity of magnetic fluid, and the displacement that the control of quality piece is axial specifically comprises:
Field coil: be wound in the outside of non-magnetic housing, produce uniform magnetic field, change the viscosity of magnetic fluid, the displacement that the control of quality piece is axial by input current.
Described magnetic fluid acceleration transducer also comprises detection control apparatus, is used for the acceleration detection consequential signal according to pick-up unit output, the input current of control field coil, thereby the internal magnetic field of control field coil.
Described pick-up unit comprises the piezoelectric element that one or polylith piezoelectric patches are formed by serial arrangement or parallel way, piezoelectric element is located between mass and the non-magnetic housing, be used to detect the displacement variation of mass, output can be for the signal of subsequent detection electric circuit inspection.
Described mass is made with the high specific gravity material.
Described mass is right cylinder or prism, and circumferentially is provided with multiple tracks groove or blade at mass, is used to increase the effective contact area with magnetic fluid.
Described non-magnetic housing comprises non magnetic inner core and non magnetic gland, wherein:
Described non magnetic inner core both ends open, two ends are installed a non magnetic gland by screw retention respectively and are compressed mass composition non-magnetic housing, and produce the preload pressure that keeps setting between mass, pick-up unit and non-magnetic housing; Perhaps,
Described non magnetic inner core one end opening, opening part are installed a non magnetic gland and are compressed mass composition non-magnetic housing, and produce the preload pressure that keeps setting between mass, pick-up unit and non-magnetic housing; Perhaps,
Also be provided with non magnetic O-ring seal between described non magnetic inner core and the non magnetic gland.
Described non-magnetic housing is right cylinder or prism, and outer wall in axial direction is provided with circumferential recess, is used to install field coil; Perhaps also comprise,
Described mass end is provided with detent, and described non-magnetic housing internal end surface place is provided with boss, and mass is circumferentially located by the non-magnetic housing internal boss.
Described magnetic fluid comprises at least a in magnetic fluid, magnetic compound fluid or the magnetic rheological body.
Described magnetic fluid acceleration transducer, also comprise shell body, described non-magnetic housing, magnetic fluid, mass, pick-up unit or magnetic field control device are arranged in the shell body inner chamber, shell body specifically comprises outer sleeve, upper end cover and bottom end cover, outer sleeve and upper end cover and bottom end cover pass through bolt, described bottom end cover is provided with installs leg and/or mounting hole, perhaps;
Be provided with spacer sleeve between described shell body and non-magnetic housing, be used to isolate getting in touch of magnetic field control device and external magnetic field, suppress external magnetic field and disturb.
As seen from the above technical solution provided by the invention, magnetic fluid acceleration transducer of the present invention comprises that non-magnetic housing is the closed container that is made of nonmagnetic substance; Mass is located at the non-magnetic housing middle part, is provided with pick-up unit between the surface of contact of both ends of the surface and non-magnetic housing, and keeps the preload pressure of setting between mass, pick-up unit and non-magnetic housing; And be full of magnetic fluid in the cavity that non-magnetic housing and mass form; Pick-up unit is used to detect the variation of pressure between mass and the non-magnetic housing, output acceleration detection consequential signal.
Specifically a mass and two piezoelectric elements can be positioned over the inside of the non-magnetic housing of the full magnetic fluid that a nonmagnetic substance forms, circumferential positioning action by non magnetic gland, make mass, piezoelectric element keep coaxial with non-magnetic housing, avoided uneven stressed situation, non magnetic gland is except playing the effect of location, pretightning force also is provided, when non magnetic gland is locked, the pretightning force that produces compresses piezoelectric element and mass, and piezoelectric element is closely contacted with mass; When having extraneous acceleration, mass is because inertia effect, to produce stretching or compression effects to piezoelectric element,, can determine the displacement of mass by detecting the output signal of piezoelectric element, and then the value of definite extraneous acceleration, simultaneously, mass also will be subjected to the damping force effect of magnetic fluid, by the damping force of control magnetic fluid, displacement that can the control of quality piece, thus realize detecting the change of range ability.
Novel on the structure of the present invention, avoided traditional cantilever beam structure, introduced piezoelectric, the pretightning force that provides by non magnetic gland, mass is closely contacted with piezoelectric, strengthen the sensitivity of described acceleration transducer on the one hand, can also eliminate the influence of radial effect on the other hand; Introduce piezoelectric in the described acceleration transducer, effectively increased the rigidity of acceleration transducer, can improve the range of acceleration transducer, realize that the acceleration transducer wide range detects; Many groove structures of symmetry are set on the mass, have not only increased stability of structure, and increased effective contact area of mass and magnetic fluid, further strengthen the sensitivity of acceleration transducer; On two end faces of mass, piezoelectric element is set, when having extraneous acceleration, will make wherein piezoelectric element pressurized, and an other piezoelectric element is loosened, this differential detection mode is effectively eliminated various interference, has improved the accuracy that the mass displacement detects; Utilize magnetic fluid viscosity controllability characteristics in addition among the present invention, by the field coil electric current is changed, change the magnetic field intensity that is applied on the magnetic fluid, reach the purpose of control magnetic fluid viscosity, thereby can reach control, realize the characteristics of wide range the acceleration transducer range.Have characteristics such as wide range, range controllability, high sensitivity, high reliability, intelligent, long working life.
Description of drawings
Fig. 1 is the three-dimensional exploded perspective view of magnetic fluid acceleration transducer of the present invention;
Fig. 2 is the structural representation of magnetic fluid acceleration transducer of the present invention;
Embodiment
Magnetic fluid acceleration transducer of the present invention comprises that non-magnetic housing is the closed container that is made of nonmagnetic substance; Mass is located at the non-magnetic housing middle part, is provided with pick-up unit between the surface of contact of both ends of the surface and non-magnetic housing, and keeps the preload pressure of setting between mass, pick-up unit and non-magnetic housing; And be full of magnetic fluid in the cavity that non-magnetic housing and mass form; Pick-up unit is used to detect the variation of pressure between mass and the non-magnetic housing, output acceleration detection consequential signal.
Specifically be the inside that mass and piezoelectric element is positioned over the non-magnetic housing of the full magnetic fluid that a nonmagnetic substance forms, circumferential positioning action by non magnetic gland, make mass, piezoelectric element keeps coaxial with non-magnetic housing, avoided the uneven stressed situation of mass and piezoelectric element, the pressure of the suffered mass of piezoelectric element according to the axis of non-magnetic housing symmetrically, non magnetic gland is except playing the effect of circumferential location to mass and piezoelectric element, necessary pretightning force also is provided, when non magnetic gland is locked, the pretightning force that produces compresses piezoelectric element and mass, piezoelectric element is closely contacted with mass, increased stability of structure like this, increased the rigidity of described acceleration transducer, the measurement sensitivity of energy increased acceleration sensor; When having extraneous acceleration, mass is because inertia effect, to produce the piezoelectric element that closely contacts with it and stretch or compression effects, when if mass produces compression to one of them piezoelectric element, this piezoelectric element can produce a corresponding output signal, another piece piezoelectric element then will be owing to being loosened the effect that produces stretching, this piezoelectric element also will produce a corresponding output signal, the output terminal of two piezoelectric elements is connected according to differential ways of connecting, can effectively eliminate various interference, the accuracy of the piece displacement detecting that improves the quality, by detecting the output signal of piezoelectric element, can determine the displacement of mass, thereby determine the value of extraneous acceleration, simultaneously, mass outer wall place is provided with the groove of multiple tracks symmetry, can effectively increase effective contact area of mass and magnetic fluid, input current by the control field coil, the magnetic field of may command field coil, the magnetic field of field coil can change the viscosity of magnetic fluid, and the change of magnetic fluid viscosity will change the damping force of magnetic fluid to mass, thus the displacement of may command mass, realize that the acceleration transducer wide range detects, also dynamic controlled quentity controlled variable journey range size.
The structure of the specific embodiment of the present invention such as Fig. 1 and shown in Figure 2, the most basic structure of described acceleration transducer comprises: non-magnetic housing, magnetic fluid 10, mass 11, pick-up unit, wherein: non-magnetic housing is the closed container that nonmagnetic substance constitutes, and inside is full of magnetic fluid 10; Non-magnetic housing comprises non magnetic inner core 6 and non magnetic gland 3, non magnetic inner core 6 both ends opens in this example, two ends are respectively by the non magnetic gland 3 of first screw, 13 fixed installations, airtight non-magnetic housing is formed in the locking back, and produces the preload pressure that maintenance is set between mass 11, pick-up unit and non-magnetic housing; In the cavity of non-magnetic housing and mass formation, be full of magnetic fluid 10; Sometimes non magnetic inner core can be an end opening under the situation that processing technology allows, and opening part compresses mass 3 by non magnetic gland of first screw, 13 fixed installations and forms non-magnetic housing, and inside is full of magnetic fluid 10.Simultaneously,, between described non magnetic inner core 6 and the non magnetic gland 3 non magnetic O-ring seal 5 can be set, prevent that magnetic fluid 10 from leaking in order to realize airtight (mainly being the sealing of magnetic fluid) of non-magnetic housing better.
Non-magnetic housing outer wall in this example in axial direction is provided with circumferential recess, the outer wall of just non magnetic inner core 6 in axial direction is provided with circumferential recess, be used to install field coil, in axial direction reserve wall thickness, be used for fixing non magnetic gland 3 at two end faces of non magnetic inner core 6.
Non-magnetic housing in this example is cylindrical, and being shaped as of just non magnetic inner core 6 is cylindrical, and the hole is opened in inside, and both ends of the surface are reserved wall thickness is installed, and in axial direction are provided with circumferential recess at the outer wall of non magnetic inner core 6, are used to install field coil 8; Certainly, non-magnetic housing also can be a prism, just non magnetic inner core 6 be shaped as prism, the hole is opened in inside, two end faces is reserved wall thickness, outer wall at non magnetic inner core 6 in axial direction is provided with circumferential recess, and groove also can be used for being provided with the coil stationary cover, and field coil 8 can be wrapped in coil stationary and put.
Magnetic fluid 10 possesses any or wherein any several combination in the fluid of magnetic for magnetic fluid, magnetic compound fluid or magnetic rheological body etc.Be full of magnetic fluid 10 in the non magnetic inner core 6 of described acceleration transducer, mass 11 is arranged in the magnetic fluid 10, is subjected to the damping force effect of magnetic fluid 10.Change the viscosity of magnetic fluid 10, can change the damping force size of 10 pairs of masses 11 of magnetic fluid, thereby change the displacement of mass 11 at axial direction.
Pick-up unit, described pick-up unit comprises the piezoelectric element 4 that one or polylith piezoelectric patches are formed by serial arrangement or parallel way, piezoelectric element 4 is located between mass 11 and the non-magnetic housing, be used to detect the displacement variation of mass 11, output can be for the signal of subsequent detection electric circuit inspection.
Piezoelectric element 4 is made of the material that quartz crystal, piezoelectric ceramics or other novel piezoelectric materials etc. possess piezoelectric effect.Piezoelectric element 4 in this example is a cylinder thin slice shape, and the hole is opened at the center, is used to be positioned at the lug boss position of non magnetic gland 3, keeps coaxial with non magnetic inner core 6, guarantee and the stress area of mass according to the axis symmetry; Certainly, do not get rid of piezoelectric element 4 and be other interchangeable shapes such as square, prismatic.Be enough to consider piezoelectric element 4 is bonded on the non magnetic gland 3 guaranteed the time in performance, simplify installation process.When the non magnetic gland 3 of locking, piezoelectric element 4 is subjected to the effect of pretightning force and tightens to connect airtight and touch contact end face with mass 11, the displacement that assurance piezoelectric element 4 can the normal induction mass.
Mass 11 is made for the high specific gravity material, and generally requiring proportion is 14-19 gram/cubic centimetre, mass can for metal as constituting by high specific gravity alloys such as tungalloy, copper-tungstens.Mass also can be for nonmetal, as long as satisfy above-mentioned specific gravity range.Mass 11 ends are provided with detent, circumferentially locate by the boss of non magnetic gland 3, and the mass 11 in this example is a right cylinder, circumferentially is provided with the multiple tracks groove at right cylinder, are used to increase effective contact area of mass 11 and magnetic fluid; Certainly, mass 11 also can be a prism, circumferentially is provided with the multiple tracks groove at prism, can increase effective contact area of mass 11 and magnetic fluid; Under the condition that processing technology allows, can mass 11 circumferentially process slim vane, can further increase effective contact area of mass 11 and magnetic fluid.When the non magnetic gland 3 of locking, the pretightning force of generation makes mass 11 closely contact with piezoelectric element 4, can increase the sensitivity of described acceleration transducer, simultaneously owing to the material behavior of piezoelectric element 4, and rigidity that can the increased acceleration sensor; When having extraneous acceleration, mass 11 is because corresponding displacement is exported in the effect of self inertia, because piezoelectric element 4 closely contacts with mass 11, the displacement of mass 11 just becomes the input quantity of piezoelectric element 4.When changing the viscosity of magnetic fluid 10, the damping force that mass 11 is subjected to magnetic fluid 10 will change, thereby its output shift quantity also changes: when identical acceleration is imported, if increase the viscosity of magnetic fluid 10, the damping force that mass 11 is subjected to magnetic fluid 10 will increase relatively, the output shift quantity of mass 11 reduces relatively, and this moment, described acceleration transducer was fit to measure the bigger input acceleration of numeric ratio; If reduce the viscosity of magnetic fluid 10, the damping force that mass 11 is subjected to magnetic fluid 10 will reduce relatively, and the output shift quantity of mass 11 increases relatively, and this moment, described acceleration transducer was fit to measure the less input acceleration of numeric ratio.Therefore, by the viscosity of control magnetic fluid 10, can control the range ability of described acceleration transducer, simultaneously, by increasing the viscosity of magnetic fluid 10 significantly, described acceleration transducer can be realized large range measuring.
In order to finish surveying work better, the acceleration transducer of the above also comprises the magnetic field control device on the basis of this example, be used to change the viscosity of magnetic fluid, the displacement that the control of quality piece is axial, specifically comprise field coil, field coil is wound in the outside of non-magnetic housing, produces uniform magnetic field by input current, change the viscosity of magnetic fluid, the displacement that the control of quality piece is axial.In this example, coil is wrapped on the groove of non magnetic inner core 6, keeps coaxial with non magnetic inner core 6; Coaxial coil also can be set fixedly be placed on the non magnetic inner core 6, field coil 8 is wrapped in coil stationary and puts.Field coil 8 is used for producing uniform magnetic field in the inside of non magnetic inner core 6, changes the electrical current of field coil 8, can change the magnetic field of non magnetic inner core 6 inside: increase the electrical current of field coil 8, will increase the magnetic field of non magnetic inner core 6 inside; Reduce the electrical current of field coil 8, will reduce the magnetic field of non magnetic inner core 6 inside.
Described acceleration transducer also comprises shell body, described non-magnetic housing, magnetic fluid 10, mass 11, pick-up unit or magnetic field control device are arranged in the shell body inner chamber, shell body specifically comprises outer sleeve 7, upper end cover 12 and bottom end cover 1, outer sleeve 7 is fixing by second screw 14 with upper end cover 12 and bottom end cover 1, and described bottom end cover 1 is provided with installs leg 15 and/or mounting hole 16.
In addition, be provided with spacer sleeve between described shell body and non-magnetic housing, be used to isolate getting in touch of magnetic field control device and external magnetic field, suppress external magnetic field and disturb.Spacer sleeve comprises non magnetic sleeve 9 and non magnetic packing ring 2.
Described acceleration transducer also comprises detection control apparatus, is used for the acceleration detection consequential signal according to pick-up unit output, the input current of control field coil, thereby the internal magnetic field of control field coil.
The principle of work of acceleration transducer of the present invention is as follows:
As Fig. 1 and shown in Figure 2, in non magnetic inner core 6, be full of magnetic fluid 10,10 li of magnetic fluids, mass 11 and piezoelectric element 4 are by the boss location of non magnetic gland 3, when the non magnetic gland 3 of locking, the pretightning force that produces makes mass 11 closely contact with piezoelectric element 4, mass 11 also is subjected to the damping force effect of magnetic fluid 10, mass 11 is provided with the multiple tracks circumferential recess, increase effective contact area with magnetic fluid 10, because non magnetic gland 3 is provided with O-ring seal 5, makes magnetic fluid 10 can not overflow; Outer wall at non magnetic inner core 6 in axial direction is provided with circumferential recess, field coil 8 is arranged in the circumferential recess, be used to provide uniform magnetic field, field coil 8 outer setting non magnetic sleeve 9, non magnetic gland 3 be provided with non magnetic packing ring, be used for the magnetic field of isolated field coil 8 and the contact of external magnetic field, prevent the external magnetic field interference.
When having extraneous acceleration, mass 11 is because action of inertia, to export corresponding displacement, this displacement becomes the input quantity of piezoelectric element 4, because mass 11 closely contacts with two piezoelectric elements 4, two input displacement opposite in signs that piezoelectric element 4 obtains, promptly wherein a piezoelectric element is compressed, an other piezoelectric element is then loosened, at this moment, and the corresponding signal value of piezoelectric element 4 outputs, because the opposite in sign of these two piezoelectric element signals, can connect by the signal of differential ways of connecting with both, detect then, this differential detection mode can be eliminated various interference; By detecting the output signal of piezoelectric element 4, then can determine the extraneous acceleration of described acceleration transducer input.
Electrical current by control field coil 8, change the magnetic field size that produces, can change the viscosity of magnetic fluid 10, because mass 11 is subjected to the damping force effect of magnetic fluid 10, therefore can change the damping force effect that mass 11 is subjected to, and then change the output shift quantity of mass 11.When identical extraneous acceleration is imported, change the electrical current of field coil 8, change the viscosity of magnetic fluid 10, the displacement of mass 11 can be changed, thereby the range controllability of described acceleration transducer can be realized; If increase substantially the viscosity of magnetic fluid 10, when identical extraneous acceleration was imported, the displacement of mass 11 will reduce, thereby realized the measurement of wide range acceleration.
If further the output quantity of piezoelectric element 4 is input to the control circuit of field coil 8 with the form of feedback, control circuit can be adjusted the electrical current of field coil 8 automatically according to the output quantity of piezoelectric element 4, then can realize the intelligent of described acceleration transducer.
No longer adopt traditional semi-girder working method in this routine described acceleration sensor structure, then introduced piezoelectric element as flexible member, improved the measurement sensitivity of described acceleration transducer, flexible member bending no longer occurs, physical deformation such as reverses in the course of the work, has also improved the mission life and the reliability of acceleration transducer.
Therefore the present invention has following advantage and beneficial effect:
1, novel on the structure of the present invention, avoided traditional cantilever beam structure, changed the principle of work of mass, be to the innovation on the existing acceleration transducer principle;
2, adopt magnetic fluid viscosity controllability characteristics among the present invention,, change the magnetic field intensity that is applied on the magnetic fluid, reach the purpose of control magnetic fluid viscosity, thereby realized acceleration transducer range controllability by the electrical current of control field coil;
3, the present invention introduces many grooves mass and piezoelectric element, by improving the viscosity of magnetic fluid, can realize the detection of wide range input acceleration;
4, take the differential connection of piezoelectric element output signal among the present invention, can effectively eliminate various interference, improved accuracy in detection;
5, the present invention has eliminated flexible member and produced elastic deformation crooked, that reverse in motion process, has improved the functional reliability of described acceleration transducer;
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (11)

1, a kind of magnetic fluid acceleration transducer is characterized in that, comprising: non-magnetic housing, mass, pick-up unit and magnetic fluid, wherein:
Non-magnetic housing: the closed container that constitutes by nonmagnetic substance;
Mass: be located at the non-magnetic housing middle part, be provided with pick-up unit between the surface of contact of both ends of the surface and non-magnetic housing, and between mass, pick-up unit and non-magnetic housing, keep the preload pressure of setting; And be full of magnetic fluid in the cavity that non-magnetic housing and mass form;
Pick-up unit: be used to detect the variation of pressure between mass and the non-magnetic housing, output acceleration detection consequential signal.
2, magnetic fluid acceleration transducer according to claim 1 is characterized in that, also comprises the magnetic field control device, is used to change the viscosity of magnetic fluid, and the displacement that the control of quality piece is axial specifically comprises:
Field coil: be wound in the outside of non-magnetic housing, produce uniform magnetic field, change the viscosity of magnetic fluid, the displacement that the control of quality piece is axial by input current.
3, magnetic fluid acceleration transducer according to claim 2, it is characterized in that, also comprise detection control apparatus, be used for acceleration detection consequential signal according to pick-up unit output, the input current of control field coil, thereby the internal magnetic field of control field coil.
4, magnetic fluid acceleration transducer according to claim 1 and 2 is characterized in that, described pick-up unit comprises the piezoelectric element that a piezoelectric patches is formed; Perhaps, described pick-up unit comprises the piezoelectric element that the polylith piezoelectric patches is formed by serial arrangement or parallel way;
Piezoelectric element is located between mass and the non-magnetic housing, is used to detect the displacement variation of mass, and output can be for the signal of subsequent detection electric circuit inspection.
5, magnetic fluid acceleration transducer according to claim 1 and 2 is characterized in that, described mass is made with the high specific gravity material.
6, magnetic fluid acceleration transducer according to claim 5 is characterized in that, described mass is right cylinder or prism, and circumferentially is provided with multiple tracks groove or blade at mass, is used to increase the effective contact area with magnetic fluid.
7, magnetic fluid acceleration transducer according to claim 1 and 2 is characterized in that, described non-magnetic housing comprises non magnetic inner core and non magnetic gland, wherein:
Described non magnetic inner core both ends open, two ends are installed a non magnetic gland by screw retention respectively and are compressed mass composition non-magnetic housing; Perhaps,
Described non magnetic inner core one end opening, opening part are installed a non magnetic gland and are compressed mass composition non-magnetic housing.
8, magnetic fluid acceleration transducer according to claim 7 is characterized in that, also is provided with non magnetic O-ring seal between described non magnetic inner core and the non magnetic gland.
9, magnetic fluid acceleration transducer according to claim 7 is characterized in that, described non-magnetic housing is right cylinder or prism, and outer wall in axial direction is provided with circumferential recess, is used to install field coil; Perhaps also comprise,
Described mass end is provided with detent, and described non-magnetic housing internal end surface place is provided with boss, and mass is circumferentially located by the non-magnetic housing internal boss.
10, magnetic fluid acceleration transducer according to claim 1 and 2, it is characterized in that, also comprise shell body, described non-magnetic housing, magnetic fluid, mass, pick-up unit or magnetic field control device are arranged in the shell body inner chamber, shell body specifically comprises outer sleeve, upper end cover and bottom end cover, outer sleeve and upper end cover and bottom end cover are by bolt, and described bottom end cover is provided with installs leg and/or mounting hole.
11, magnetic fluid acceleration transducer according to claim 10 is characterized in that, is provided with spacer sleeve between described shell body and non-magnetic housing, is used to isolate getting in touch of magnetic field control device and external magnetic field, suppresses external magnetic field and disturbs.
CNB2007100639918A 2007-02-15 2007-02-15 Magnetic fluid acceleration transducer Expired - Fee Related CN100573154C (en)

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CN103591945A (en) * 2013-11-19 2014-02-19 天津大学 Magnetic fluid top suitable for measuring 0-1 KHz of input signals
CN103675351A (en) * 2013-12-26 2014-03-26 北京交通大学 Novel inductive magnetic liquid acceleration sensor
CN110244074B (en) * 2019-05-28 2024-04-02 南方科技大学 Patch type micro magnetic fluid rotating speed sensor and preparation method thereof
CN111307273B (en) * 2020-03-27 2021-12-17 重庆理工大学 Inductance type vibration sensor based on magnetic sensitive material

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
磁流体传感器研究现状与发展趋势. 曹东等.传感器与微系统，第25卷第5期. 2006
磁流体传感器研究现状与发展趋势. 曹东等.传感器与微系统，第25卷第5期. 2006 *

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