CN106678177B - A kind of controllable composite damping active damping magnetic fluid bearing - Google Patents
A kind of controllable composite damping active damping magnetic fluid bearing Download PDFInfo
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- CN106678177B CN106678177B CN201710008898.0A CN201710008898A CN106678177B CN 106678177 B CN106678177 B CN 106678177B CN 201710008898 A CN201710008898 A CN 201710008898A CN 106678177 B CN106678177 B CN 106678177B
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- coil
- magnetic fluid
- rotary shaft
- cylinder barrel
- seal casinghousing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
Abstract
The invention discloses a kind of controllable composite damping active damping magnetic fluid bearings, including a rotary shaft, the coaxial seal casinghousing being set in rotary shaft, be additionally provided in seal casinghousing: coil cylinder barrel, inner ring are coaxially set in rotary shaft, and outer ring is fixed on the inner sidewall of seal casinghousing；First coil skeleton, inner ring are coaxially set in rotary shaft, and outer ring is fixed in the inner sidewall of coil cylinder barrel；It is wound with the first excitation coil on first coil skeleton, is arranged so that the first excitation coil is enclosed around the rotary shaft one；Magnetic fluid is imported with magnetic fluid in seal casinghousing, is also filled with magnetic fluid in the gap between coil cylinder barrel, first coil skeleton and rotary shaft；Magnetic fluid between rotary shaft and coil cylinder barrel in work department is used for vibration damping；The energization of first excitation coil generates the first magnetic field for passing perpendicularly through the magnetic fluid in work department, for increasing the viscosity of magnetic fluid.Good damping result of the present invention, and the active damping having the function of.
Description
Technical field
The present invention relates to survival equipment design fields, and in particular to a kind of controllable composite damping active damping magnetic fluid
Bearing.
Background technique
With the development of industrial technology, higher and higher to the requirement of rotating machinery, high speed, high-precision, high load capacity are always
The target that rotating machine art development is pursued.And supporting technology is high speed, the key technology of high-precision rotary machinery.It is most important
Bearing-bearing is generally divided into two classes: rolling bearing and sliding bearing.Although rolling bearing running accuracy is very high, what it bore
Load is small, working life is short, is restricted in the application field of some high speeds, heavy duty.The running accuracy of sliding bearing itself and
Stability is not high to be also difficult to adapt to the high-precision demand for development of rotating machinery.
The double grading of magnetic fluid not only magnetic material and fluid, but also have and control rheological characteristic, thermal physical characteristic using magnetic field
With the ability of optical property.In addition, magnetic fluid does not show magnetism macroscopically when no externally-applied magnetic field；When having externally-applied magnetic field, table
It is now superparamagnetism, while in a certain range, viscosity becomes larger with the enhancing of magnetic field strength.Used in Boundary Lubrication of Magnetic Fluids sliding axle
It holds, the bearing being exactly lubricated using joined the carrier fluid (i.e. magnetic fluid) of magnetic retention particle as lubricant medium.In carrier fluid
While realizing lubricant effect identical with plain oil, when there is externally-applied magnetic field effect, using magnetic fluid as the viscosity of oil film
Increase, radially corresponding damping increases with it with bearing, plays the role of vibration damping.
But existing magnetic fluid sliding bearing exists and damping capacity can not be adjusted, can not active damping, exist
Uncontrollable problem；And although existing magnetic fluid sliding bearing has preferable effectiveness in vibration suppression, effectiveness in vibration suppression is not strong enough
Greatly, it is impossible to meet the vibration damping demands of specific bearing.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of controllable composite damping active damping magnetic fluid bearings, including
One rotary shaft is coaxially set in seal casinghousing in rotary shaft, is additionally provided in the seal casinghousing:
Coil cylinder barrel, inner ring are coaxially set in the rotary shaft, and outer ring is fixed on the inside of the seal casinghousing
On wall；
First coil skeleton, inner ring are coaxially set in the rotary shaft, and outer ring is fixed on the coil cylinder barrel
In inner sidewall；It is wound with the first excitation coil on the first coil skeleton, so that first excitation coil is around the rotation
The circle setting of axis one；
Magnetic fluid is imported with magnetic fluid, and the coil cylinder barrel, the first coil skeleton and institute in the seal casinghousing
It states in the gap between rotary shaft and is also filled with magnetic fluid；
The rotary shaft is rotated relative to the coil cylinder barrel, first coil skeleton, the rotary shaft and the coil cylinder
Magnetic fluid between cylinder in work department is used for vibration damping；First excitation coil, which is powered, generates the first magnetic field, and the first magnetic field is vertical
Magnetic fluid in the work department, for increasing the viscosity of magnetic fluid.
Preferably, one end of the coil cylinder barrel is axially provided with a stepped hole, the aperture of the stepped hole is greater than described
The aperture of the inner ring of coil cylinder barrel, the first coil skeleton are mounted in the stepped hole；It is additionally provided in the stepped hole
One magnetic conduction cylinder barrel, magnetic conduction cylinder barrel end are pressed on one end of the first coil skeleton, are used for the first coil bone
Frame is fixed in the stepped hole；
The inner ring of the magnetic conduction cylinder barrel is set in the rotary shaft, between the magnetic conduction cylinder barrel and the rotary shaft between
Magnetic fluid is also filled in gap, the first magnetic field that first excitation coil generates sequentially passes through rotary shaft, rotary shaft and coil cylinder
Magnetic fluid, first coil skeleton, magnetic conduction cylinder barrel, magnetic conduction cylinder barrel between cylinder and the magnetic fluid between rotary shaft, form a closure
Magnetic circuit.
Preferably, the seal casinghousing includes bearing shell shell, it is covered on the both ends open of the bearing shell shell close
Capping, the rotary shaft and the bearing shell shell are coaxially disposed, and the sealing cover is stretched out at the both ends of the rotary shaft；The line
The outer ring of circle cylinder barrel is mounted on the inner sidewall of the bearing shell shell.
Preferably, being additionally provided with O-ring seal between the sealing cover and the bearing shell shell end.
Preferably, being provided with a step on the inner wall of the bearing shell shell, one end of the coil cylinder barrel is pressed in described
On rank；Top cylinder is additionally provided in the bearing casing cabable body, described top cylinder one end is against on the other end of the coil cylinder barrel, with institute
It states the sealing cover that bearing shell shell is fixedly connected to be against on the other end of the top cylinder, for fixing the coil cylinder barrel.
Preferably, be additionally provided with oil filler point and wire guide on the seal casinghousing, by the oil filler point to the sealing
Baffle is injected in shell, realizes that first excitation coil is connect with external power supply by the wire guide.
Preferably, further including having two groups of preload driving assemblies, the seal casinghousing is located in a bearing block, the tight driving
Component is mounted on bearing block；
Every group of preload driving assembly includes driver and pre-tightening mechanism, and driver and pre-tightening mechanism are symmetrically pressed in described close
On the lateral wall of capsule body, the driver and the pre-tightening mechanism are used to apply symmetrical radial force to the seal casinghousing；
The radial force that preload driving assembly applies the seal casinghousing described in two groups is perpendicular.
Preferably, the driver is super-magnetostrictive drive, the super-magnetostrictive drive includes an installation
Outer housing on the bearing block is provided with push rod, upper permanent magnet, ultra-magnetic telescopic that sequence abuts in the outer housing
Stick, lower permanent magnet, the upper end of the push rod, which is stretched out at the top of the outer housing, to be against on the seal casinghousing side wall, the lower permanent magnetism
Body is against the outer housing bottom；
Be additionally provided with the second coil rack in the outer housing, second coil rack be set in the push rod, on forever
Magnet, giant magnetostrictive rod, lower permanent magnet outer ring on；The second excitation coil is wound on second coil rack, it is described
Second excitation coil, which is powered, generates the second magnetic field, and second magnetic field sequentially passes through outer housing bottom, shell body sidewall, outer housing
Top, push rod, upper permanent magnet, giant magnetostrictive rod, lower permanent magnet form a closed magnetic circuit.
Preferably, being provided at least one roller slot, the roller slot on one end that the push rod and seal casinghousing offset
It is inside provided with roller, the roller is between the push rod and the seal casinghousing.
Preferably, the pre-tightening mechanism is that torsional spring pre-tightens force mechanisms, it include torsional spring pretightning force pedestal, rotation
Lid, the lower end of the torsional spring pretightning force pedestal are against on the lateral wall of the seal casinghousing, and the upper end of the spiral cover passes through
It is threadably mounted on the bearing block, the lower end of the spiral cover is against the upper end of the torsional spring pretightning force pedestal.
Preferably, being provided with spring between the torsional spring pretightning force pedestal and the spiral cover lower end.
Preferably, further including there are two displacement sensor, described two displacement sensors are respectively used to measurement rotary shaft,
Preload driving assembly described in two groups applies the axle center rail on the direction of radial force to the seal casinghousing and assists.
The present invention due to using the technology described above, is allowed to compared with prior art, have the following advantages that and actively imitate
Fruit:
1) controllable composite damping active damping magnetic fluid bearing provided by the invention, by the first excitation coil generate across
The viscosity for increasing magnetic fluid is played the role of, to increase effectiveness in vibration suppression in first magnetic field of magnetic fluid；And the present invention is to pass through
First excitation coil generates magnetic field, compared with the existing technology in by the way of permanent magnet, the present invention can be by adjusting the
The electric current of one excitation coil, thus change magnetic field strength, thus magnetic fluid viscosity, to realize what the active of damping effect was adjusted
Function；
The present invention not only position precision with higher compared with traditional filmatic bearing, the position adjustment function of active, and
And there is stronger active damping performance；
2) controllable composite damping active damping magnetic fluid bearing provided by the invention, by pre-tightening the setting of driving assembly,
Apply radial force to seal casinghousing, then be transported in rotary shaft, to further play the effect of vibration damping；Pre-tighten driving assembly
The damping that work department magnetic fluid provides in the damping and seal casinghousing of offer, two parts damping collective effect
The lower vibration damping aligning for reaching entire rotation axis, reaches the active damping function that general sliding bearing does not have；
3) controllable composite damping active damping magnetic fluid bearing provided by the invention passes through setting according to two displacement sensors
It sets, the data measured obtain the orbit of shaft center of rotary shaft, and then obtain the Vibration Condition of rotary shaft, adjust driver input current
The size of (i.e. the operating current of the second excitation coil) carries out real-time active control to magnetic fluid bearing.
Detailed description of the invention
In conjunction with attached drawing, by hereafter state detailed description, can be more clearly understood that above-mentioned and other feature of the invention and
Advantage, in which:
Fig. 1 is the structural schematic diagram of controllable composite damping active damping magnetic fluid bearing provided by the invention；
Fig. 2 is A-A axial sectional view in Fig. 1；
Fig. 3 is B-B axial sectional view in Fig. 2.
Specific embodiment
Referring to the attached drawing for showing the embodiment of the present invention, the present invention is described in more detail.However, the present invention can be with
Many different forms are realized, and should not be construed as being limited by the embodiment herein proposed.On the contrary, proposing that these embodiments are
In order to reach abundant and complete disclosure, and those skilled in the art is made to understand the scope of the present invention completely.These are attached
In figure, for clarity, the size and relative size in layer and region may be exaggerated.
Referring to Fig.1-3, the present invention provides a kind of controllable composite damping active damping magnetic fluid bearings, including a rotary shaft
27, it is coaxially set in seal casinghousing in rotary shaft 27, is additionally provided with coil cylinder barrel 15, first coil skeleton in seal casinghousing
13；The inner ring of coil cylinder barrel 15 is coaxially set in rotary shaft 27, and outer ring is fixed on the inner sidewall of seal casinghousing；First coil
The inner ring of skeleton 13 is coaxially set in rotary shaft 27, and outer ring is fixed in the inner sidewall of coil cylinder barrel 15；First coil skeleton
It is wound with the first excitation coil 7 on 13, is arranged so that the first excitation coil 7 is enclosed around rotary shaft 27 1；It is imported in seal casinghousing
Magnetic fluid, and magnetic fluid is also filled in the gap between coil cylinder barrel 15, first coil skeleton 13 and rotary shaft 27.
In the course of work, rotary shaft 27 is rotated relative to coil cylinder barrel 15, first coil skeleton 13, rotary shaft 27 and coil
Magnetic fluid between cylinder barrel 15 in work department 16 is used for vibration damping；Meanwhile first excitation coil 7 be powered generate the first magnetic field, first
Magnetic field passes perpendicularly through the magnetic fluid in work department 16, plays the role of the viscosity for increasing magnetic fluid, to increase effectiveness in vibration suppression；
And the present invention is to generate magnetic field by excitation coil, middle by the way of permanent magnet compared with the existing technology, the present invention can
With the electric current by adjusting the first excitation coil, thus change magnetic field strength, thus magnetic fluid viscosity, to realize damping effect
Active adjust function.
In the present embodiment, seal casinghousing includes bearing shell shell 20, and 20 axial ends of bearing shell shell has opening, and axis
It is covered with sealing cover 17 on the both ends open of watt shell 20, thus the confined space of one accommodating magnetic fluid of composition；Rotary shaft 27
It is coaxially disposed with bearing shell shell 20, and sealing cover 17 is stretched out at the both ends of rotary shaft 27, the outer ring of coil cylinder barrel 15 is mounted on bearing shell
On the inner sidewall of shell 20.Further, it is additionally provided with O-ring seal 18 between 20 end of sealing cover 17 and bearing shell shell, used
Sealing between reinforcement sealing cover 17 and bearing shell shell 20.
In the present embodiment, a step is provided on the inner wall of bearing shell shell 20, the right end of coil cylinder barrel 15 is pressed in step
On；Top cylinder 19 is additionally provided in bearing shell shell 20, the right end of top cylinder 19 is against on the left end of coil cylinder barrel 15, with bearing shell shell
20 sealing covers 17 being fixedly connected are against again on the right end of top cylinder 19, and coil cylinder barrel 15 is fixed on bearing shell shell to realize
Function on inner sidewall, certainly, the fixed form of coil cylinder barrel 15 are not limited thereto, and fixed form structure of the invention is simple
Convenient for the fixed installation of coil cylinder barrel 15.
In the present embodiment, one end of coil cylinder barrel 15 is axially provided with a stepped hole, and the aperture of stepped hole is greater than coil
The aperture of the inner ring of cylinder barrel 15；The first coil skeleton 13 for being wound with excitation coil is mounted in stepped hole, and first coil skeleton
13 left end is pressed in stepped hole bottom；A magnetic conduction cylinder barrel 14 is additionally provided in stepped hole, magnetic conduction cylinder barrel 14 is lived for axial restraint
The first coil hanger 13, specific 14 left end of magnetic conduction cylinder barrel are pressed on the right end of first coil skeleton 13, magnetic conduction cylinder barrel 14
Right end flushed with the right end of coil cylinder barrel 15, the right end of top cylinder 19 has also been against magnetic conduction while be against coil 15 right end of cylinder barrel
On the right end of cylinder barrel 14, to realize the fixation of first coil skeleton 13.In the present embodiment, by coil cylinder barrel 15
The setting of stepped hole and magnetic conduction cylinder barrel 14 is set, is for the ease of first coil skeleton 13 to be installed in coil cylinder barrel 15
In side wall, certainly, first coil skeleton 13 can also be installed to by other means in coil cylinder barrel 15 in other embodiments, this
Place is with no restrictions.
Further, the inner ring of magnetic conduction cylinder barrel 14 is set in rotary shaft 27, between magnetic conduction cylinder barrel 14 and rotary shaft 27
Magnetic fluid is also filled in gap, the first magnetic field that the first excitation coil 7 generates sequentially passes through 27 → rotary shaft of rotary shaft 27 and line
Enclose cylinder barrel 15 between magnetic fluid → between first coil skeleton 13 → magnetic conduction, 14 → magnetic conduction of cylinder barrel cylinder barrel 14 and rotary shaft 27
Magnetic fluid → rotary shaft 27, to form a closed magnetic circuit, which passes perpendicularly through the magnetic fluid in working space 16.
In the present embodiment, oil filler point 12 and wire guide 8 are additionally provided on seal casinghousing；Oil guiding hole 12 is used for capsul
Injection magnetic fluid in vivo, so that rushing full magnetic fluid in the work department 16 of rotary shaft 27, specific oil guiding hole 12 is set up directly on axis
On the side wall of watt shell 20, as shown in Figure 2；Connection of the wire guide 8 for the first excitation coil 7 and external power supply, specifically
Wire guide 8 sequentially passes through 20 coil cylinder barrel 15 of bearing shell shell, as shown in Figure 2.
In the present embodiment, which further includes having two groups of preload driving groups
Part, every group of preload driving assembly include driver 2 and pre-tightening mechanism 3, and driver 2 and pre-tightening mechanism 3 are symmetrically pressed in capsul
On the lateral wall of body, driver 2 and pre-tightening mechanism 3 are used to apply symmetrical radial force to seal casinghousing；Two groups of preload driving groups
The radial force that part applies seal casinghousing is perpendicular, to ensure that the stabilization radially to exert a force.The present invention is by pre-tightening driving group
The setting of part applies radial force to seal casinghousing, then is transported in rotary shaft 27, to further play the effect of vibration damping.
Pre-tighten the damping that work department magnetic fluid provides in the damping and seal casinghousing that driving assembly provides, two parts vibration damping
The vibration damping aligning that entire rotation axis is reached under damping collective effect, reaches the active damping function that general sliding bearing does not have
Energy.
Specifically, driver 2 uses super-magnetostrictive drive in the present embodiment, super-magnetostrictive drive is mounted on
On bearing block 1, and seal casinghousing also is located in bearing block 1.
Super-magnetostrictive drive includes an outer housing being mounted on bearing block 1, and outer housing is by main casing 23, setting
It is constituted in the pedestal 24 on 23 lower ending opening of main casing, the upper cover 22 that is arranged in 23 upper end opening of main casing, pedestal 24 passes through
The modes such as screw are fixed on bearing block 1；It is provided with the push rod 5 that sequence abuts from top to bottom in outer housing, upper permanent magnet 4, surpasses
Magnetostrictive rod 31, lower permanent magnet 32, the upper end of push rod 5 are stretched out upper cover 22 and are against on the lateral wall of bearing shell shell 20, lower permanent magnetism
The lower end of body 32 is against on outer housing bottom.The second coil rack 21 is additionally provided in outer housing, the second coil rack 21 is arranged
Push rod 5, upper permanent magnet 4, giant magnetostrictive rod 31, lower permanent magnet 32 outer ring on；Is wound on second coil rack 21
Two excitation coils 30, the second excitation coil 30, which is powered, generates the second magnetic field.Second magnetic field sequentially passes through outer housing bottom (i.e. pedestal
24), shell body sidewall (i.e. main casing 23), outer housing top (i.e. upper cover 22), push rod 5, upper permanent magnet 4, giant magnetostrictive rod
31, lower permanent magnet 32, to form a closed magnetic circuit.
The present invention is generated by the second excitation coil 30 across the magnetic field of giant magnetostrictive rod 31, and giant magnetostrictive rod is caused
31 stretch along magnetic induction line direction (i.e. vertical direction in Fig. 2) and generate power output and displacement, to successively push upper permanent magnetism
Body 4 and push rod 5, so that push rod 5 applies radial force to the lateral wall of seal casinghousing, radial force is further transferred to rotary shaft 27
On, to play the effect of vibration damping；Meanwhile the present invention is to generate magnetic field by the second excitation coil 30, passes through control the
The size of current of two excitation coils 30 controls magnetic field strength, so as to control the stroke of giant magnetostrictive rod 31, thus
It realizes and effectiveness in vibration suppression is precisely controlled.
In addition, the present invention is respectively arranged with a permanent magnet (4,32) in the upper and lower side of giant magnetostrictive rod 31, for producing
Raw bias magnetic field, playing the frequency multiplication phenomenon that inhibits the giant magnetostrictive rod 31 in excitation field, (frequency multiplication phenomenon will affect
The control of 31 stroke of giant magnetostrictive rod), be conducive to the power output and output displacement that accurately manipulate giant magnetostrictive rod 31.This
The seal casinghousing that invention controls magnetic fluid bearing using the super-magnetostrictive drive of permanent magnet type bias magnetic field carries out position
Adjustment and application damping, the fabric driver is because using permanent magnet, so generation heat itself is few, to magnetic fluid bearing
Position control accuracy is improved effect.
Further, it is provided at least one roller slot on one end that push rod 5 and bearing shell shell 20 offset, is set in roller slot
It is equipped with roller 6, roller 6 is between push rod 5 and bearing shell shell 20, as shown in Figure 3.(illustrate that lower roller slot, roller are arranged
Effect).
In the present embodiment, pre-tightening mechanism is that torsional spring pre-tightens force mechanisms, and torsional spring pre-tightens force mechanisms and is mounted on axis
It holds on seat 1.
Specifically, it includes torsional spring pretightning force pedestal 9, spiral cover 11 that torsional spring, which pre-tightens force mechanisms, torsional spring is pre-
The lower end of clamp force pedestal 9 is against on the lateral wall of bearing shell shell 20, and is fitted closely with the lateral wall of bearing shell shell 20；Spiral cover 11
Upper end by being threadably mounted on bearing block 1, the lower end of spiral cover 11 is against the upper end of torsional spring pretightning force pedestal 9.Rotation
Spiral cover 11 so that spiral cover 11 relative to bearing block rotation axis to moving down, and torsional spring pretightning force pedestal 9 is pushed to be pressed on bearing shell
On the lateral wall of shell 20, apply pretightning force to it, while can quantify to rotate helical spring by the rotating cycle of screw thread
Pre-tighten the size that the pretightning force of force mechanisms applies；The pretightning force is transmitted on roller 6 by bearing bush shell, and then is transmitted to
On giant magnetostrictive material stick 30, the work of the positioning to magnetic fluid bearing (i.e. seal casinghousing and internal structure) is not only acted as in this way
With, and effect is improved to the displacement output performance of driver.
Further, the upper end of torsional spring pretightning force pedestal 9 is provided with a groove, and the lower end of spiral cover 11 is provided with stretching
Portion, extension are put in groove；And spring 10 is arranged on extension, 10 upper end of spring is against on spiral cover 11, and lower end is against recessed
Trench bottom.
In the present embodiment, which further includes that there are two displacement sensors
29, two displacement sensors are respectively used to measurement rotary shaft 27, apply radial force to seal casinghousing in two groups of preload driving assemblies
Direction on orbit of shaft center；Further, two displacement sensors 29 are horizontal and vertical two non-contact electric eddy positions
Displacement sensor.The orbit of shaft center of rotary shaft 27 is obtained according to the data that two displacement sensors 29 are measured, and then obtains rotary shaft
27 Vibration Condition adjusts the size of driver input current (i.e. the operating current of the second excitation coil), to magnetic fluid bearing
Carry out real-time active control.
Those skilled in the art should be understood that the present invention can be implemented without departing from it with many other concrete forms
The spirit or scope of itself.Although case study on implementation of the invention has been described, it should be understood that the present invention should not be limited to these implementations
Example, those skilled in the art can make variation within the spirit and scope of the present invention as defined by the following claims
And modification.
Claims (9)
1. a kind of controllable composite damping active damping magnetic fluid bearing, which is characterized in that including a rotary shaft, be coaxially set in rotation
Seal casinghousing in shaft is additionally provided in the seal casinghousing:
Coil cylinder barrel, inner ring are coaxially set in the rotary shaft, and outer ring is fixed on the inner sidewall of the seal casinghousing；
First coil skeleton, inner ring are coaxially set in the rotary shaft, and outer ring is fixed on the inside of the coil cylinder barrel
In wall；It is wound with the first excitation coil on the first coil skeleton, so that first excitation coil is around the rotary shaft one
Circle setting；
Magnetic fluid is imported with magnetic fluid, and the coil cylinder barrel, the first coil skeleton and the rotation in the seal casinghousing
Magnetic fluid is also filled in gap between shaft；
The rotary shaft is rotated relative to the coil cylinder barrel, first coil skeleton, the rotary shaft and the coil cylinder barrel it
Between magnetic fluid in work department be used for vibration damping；First excitation coil, which is powered, generates the first magnetic field, and the first magnetic field passes perpendicularly through
Magnetic fluid in the work department, for increasing the viscosity of magnetic fluid；
The controllable composite damping active damping magnetic fluid bearing further includes two groups of preload driving assemblies, and the seal casinghousing is located at
In one bearing block, the preload driving assembly is mounted on bearing block；
Every group of preload driving assembly includes driver and pre-tightening mechanism, and driver and pre-tightening mechanism are symmetrically pressed in the capsul
On the lateral wall of body, the driver and the pre-tightening mechanism are used to apply symmetrical radial force to the seal casinghousing；Two groups
The radial force that the preload driving assembly applies the seal casinghousing is perpendicular；
The driver is super-magnetostrictive drive, and the super-magnetostrictive drive includes one to be mounted on the bearing block
On outer housing, push rod, the upper permanent magnet, giant magnetostrictive rod, lower permanent magnet that sequence abuts, institute are provided in the outer housing
The upper end for stating push rod, which is stretched out at the top of the outer housing, to be against on the seal casinghousing side wall, and the lower permanent magnet is against the shell
Body bottom；
It is provided at least one roller slot on one end that the push rod and seal casinghousing offset, is provided with rolling in the roller slot
Stick, the roller is between the push rod and the seal casinghousing；
The pre-tightening mechanism is that torsional spring pre-tightens force mechanisms, includes torsional spring pretightning force pedestal, spiral cover, the rotating missile
The lower end of spring pretightning force pedestal is against on the lateral wall of the seal casinghousing, and the upper end of the spiral cover is described by being threadably mounted at
On bearing block, the lower end of the spiral cover is against the upper end of the torsional spring pretightning force pedestal.
2. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that the coil cylinder
One end of cylinder is axially provided with a stepped hole, and the aperture of the stepped hole is greater than the aperture of the inner ring of the coil cylinder barrel, described
First coil skeleton is mounted in the stepped hole；A magnetic conduction cylinder barrel, magnetic conduction cylinder barrel end are additionally provided in the stepped hole
Portion is pressed on one end of the first coil skeleton, for the first coil skeleton to be fixed in the stepped hole；
The inner ring of the magnetic conduction cylinder barrel is set in the rotary shaft, in the gap between the magnetic conduction cylinder barrel and the rotary shaft
Be also filled with magnetic fluid, the first magnetic field that first excitation coil generates sequentially pass through rotary shaft, rotary shaft and coil cylinder barrel it
Between magnetic fluid, first coil skeleton, magnetic conduction cylinder barrel, the magnetic fluid between magnetic conduction cylinder barrel and rotary shaft, form a closed magnetic circuit.
3. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that the capsul
Body includes bearing shell shell, and sealing cover, the rotary shaft and the bearing shell are covered on the both ends open of the bearing shell shell
Shell coaxial arrangement, and the sealing cover is stretched out at the both ends of the rotary shaft；The outer ring of the coil cylinder barrel is mounted on the axis
On the inner sidewall of watt shell.
4. controllable composite damping active damping magnetic fluid bearing according to claim 3, which is characterized in that the sealing cover
O-ring seal is additionally provided between the bearing shell shell end.
5. controllable composite damping active damping magnetic fluid bearing according to claim 3, which is characterized in that the bearing casing cabable
A step is provided on the inner wall of body, one end of the coil cylinder barrel is pressed on the step；It is also set up in the bearing casing cabable body
There is top cylinder, described top cylinder one end is against on the other end of the coil cylinder barrel, the sealing being fixedly connected with the bearing shell shell
Lid is against on the other end of the top cylinder, for fixing the coil cylinder barrel.
6. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that the capsul
It is additionally provided with oil filler point and wire guide on body, baffle is injected into the seal casinghousing by the oil filler point, by described
Wire guide realizes that first excitation coil is connect with external power supply.
7. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that the outer housing
Inside be additionally provided with the second coil rack, second coil rack be set in the push rod, upper permanent magnet, giant magnetostrictive rod,
On the outer ring of lower permanent magnet；The second excitation coil is wound on second coil rack, second excitation coil, which is powered, to be produced
Raw second magnetic field, second magnetic field sequentially passes through outer housing bottom, shell body sidewall, outer housing top, push rod, upper permanent magnetism
Body, giant magnetostrictive rod, lower permanent magnet form a closed magnetic circuit.
8. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that the rotating missile
Spring is provided between spring pretightning force pedestal and the spiral cover lower end.
9. controllable composite damping active damping magnetic fluid bearing according to claim 1, which is characterized in that further include having two
A displacement sensor, described two displacement sensors are respectively used to measurement rotary shaft, and preload driving assembly is to institute described in two groups
State the orbit of shaft center on the direction of seal casinghousing application radial force.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710008898.0A CN106678177B (en) | 2017-01-05 | 2017-01-05 | A kind of controllable composite damping active damping magnetic fluid bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008898.0A CN106678177B (en) | 2017-01-05 | 2017-01-05 | A kind of controllable composite damping active damping magnetic fluid bearing |
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| CN106678177A CN106678177A (en) | 2017-05-17 |
| CN106678177B true CN106678177B (en) | 2019-10-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108506344A (en) * | 2018-04-09 | 2018-09-07 | 上海应用技术大学 | A kind of magnetic fluid sliding bearing |
| CN109854622B (en) * | 2019-03-26 | 2020-04-28 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Active magnetic bearing system capable of controlling axial system radial vibration based on intelligent material |
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