CN104595407B - A kind of magneto-rheological vibration damper - Google Patents
A kind of magneto-rheological vibration damper Download PDFInfo
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- CN104595407B CN104595407B CN201510010251.2A CN201510010251A CN104595407B CN 104595407 B CN104595407 B CN 104595407B CN 201510010251 A CN201510010251 A CN 201510010251A CN 104595407 B CN104595407 B CN 104595407B
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
- Sealing Devices (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Magneto-rheological vibration damper disclosed by the invention includes cylinder barrel, the inner chamber of cylinder barrel is provided with piston and piston rod, the port of export of piston rod is provided with first order sealing device, first order sealing device includes the first sealing shell and the first permanent-magnetic clamp being arranged in the inner chamber of the first sealing shell and two first annular magnetic poles, first seals casing is located at the outside of piston rod, each first annular magnetic pole includes the ring part that is wholely set and overhanging tapered portion, tapered portion is set in outside piston rod, there is between tapered portion and piston rod the first gap, first permanent-magnetic clamp is arranged between the ring part of two first annular magnetic poles, diamagnetic filler it is filled with between the tapered portion of two first annular magnetic poles.Good sealing effect of the present invention, its first order sealing device acts primarily as the effect sealed of resistance to wearing, and increases service life of vibroshock, also has simultaneously and shares the effect sealing pressure.
Description
Technical field
The present invention relates to a kind of vibroshock, especially relate to a kind of magneto-rheological vibration damper.
Background technology
Magneto-rheological vibration damper is typical hydraulic cylinder structure, and the hydraulic buffer of the more suitable physical dimension of damping force is bigger.In magneto-rheological vibration damper in use cylinder barrel, magnetic flow liquid (being made up of magnetic-particle and carrier fluid) carrier fluid easily leaks, leakage can cause that magneto-rheological vibration damper performance changes, along with increasing the weight of of liquid oil leakage, the viscous damping coefficient of magnetic flow liquid also can increase therewith, the maximum damping force causing magneto-rheological vibration damper is gradually increased, but its damping force-displacement curve also becomes more and more not full, and model center building reduces.The solution problem of magneto-rheological vibration damper leakage is always up a difficult problem, the position of leakage occurs mainly in the port of export of piston rod, the liquid of leakage is mainly the carrier fluid in magnetic flow liquid, end cap and the seal failure of piston rod place are the reasons causing leakage, this place is generally movable sealing, the main mode adopting this special envelope and O combination.
Reciprocating motion due to magneto-rheological vibration damper piston, during vibroshock work, Si Te envelope has relative sliding with O and piston rod, and there is contact friction easily abrasion, it can be seen that one section of bright trace on this piston rod after vibroshock is dismantled, illustrate there is abrasion, increased wear along with this special envelope with O, cause that sealing member voltage endurance capability reduces, when the pressure in vibroshock cylinder barrel is more than the allowable pressure of sealing member, the carrier fluid that magnetic flow liquid Middle molecule is less will leak, frictional heating easily makes sealing member softening transform reduce and seals pressure simultaneously, finally leak, leakage makes the stability of vibroshock and reliability reduce, the mechanical property causing magneto-rheological vibration damper is irregular change, affect effectiveness in vibration suppression, this is also the main cause that magneto-rheological vibration damper is difficult to be used widely, and the problem leaked receives much concern always.
For avoiding the leakage of magneto-rheological vibration damper carrier fluid, domestic scholars are made that a lot of effort, such as once it has been proposed that magnetic liquid sealing structure to be used for the sealing of magneto-rheological vibration damper, but owing to the yield stress of magnetic liquid is relatively low, cause that magnetic fluid sealing pressure is inadequate, therefore its sealing effectiveness is still not ideal enough, it is impossible to fundamentally solve the leakage problem of carrier fluid.
Summary of the invention
The technical problem to be solved is: for the deficiencies in the prior art, it is provided that the magneto-rheological vibration damper of a kind of good sealing effect.
This invention address that the technical scheme that above-mentioned technical problem adopts is: a kind of magneto-rheological vibration damper, including cylinder barrel, the inner chamber of described cylinder barrel is provided with piston and piston rod, the arranged outside of described piston has permanent-magnetic clamp and magnet exciting coil, described piston rod can do linear reciprocating motion in a working chamber, described working chamber is filled with magnetic flow liquid, described magnetic flow liquid is made up of magnetic-particle and carrier fluid, the side of described working chamber is provided with seal, the arranged outside of described seal has rear end cap, described rear end cap is provided with single journal stirrup, the other end of described piston rod is connected to double, two journal stirrup, the port of export of described piston rod is provided with first order sealing device, described first order sealing device is arranged on one end of the working chamber of described cylinder barrel, described first order sealing device includes the first sealing shell and the first permanent-magnetic clamp in the inner chamber being arranged on the first described sealing shell and two first annular magnetic poles, described first seals casing and is located at the outside of described piston rod, each described first annular magnetic pole includes the ring part that is wholely set and overhanging tapered portion, described tapered portion is set in outside described piston rod, there is between described tapered portion and described piston rod the first gap, two described first annular magnetic poles are oppositely arranged, the tapered portion of two described first annular magnetic poles is adjacent, the first described permanent-magnetic clamp is arranged between the ring part of the first annular magnetic pole of described two, it is filled with diamagnetic filler between the tapered portion of two described first annular magnetic poles.First order sealing device is arranged on the port of export of piston rod, connects with the working chamber of piston rod, and its side contacts with magnetic flow liquid.First order sealing device is excited magnetic energy by the first permanent-magnetic clamp, forms magnetic loop through the first gap two first annular magnetic poles, piston rod and two first annular magnetic poles and piston rod, forms high-intensity magnetic field between two first annular magnetic poles and piston rod.When piston rod does linear reciprocating motion, magnetic flow liquid in its working chamber also can move, the high pressure magnetic flow liquid formed can impact the one side of the first sealing shell, cause that part magnetic flow liquid enters in the first gap under the effect of the pressure, the existence of the high-intensity magnetic field owing to being formed between above-mentioned two first annular magnetic poles and piston rod, the magnetic-particle in magnetic flow liquid in adsorbable entrance the first gap of this high-intensity magnetic field, form firmly sealing ring, thus can effectively stop the continuation of magnetic-particle to external diffusion, reduce the abrasion of vibroshock, set up sealing of effectively resistance to wearing.Therefore, first order sealing device acts primarily as the effect sealed of resistance to wearing, good sealing effect, can increase the service life of vibroshock, also has simultaneously and shares the effect sealing pressure.First seals shell can adopt non-magnet material to make, such as 316L austenitic stainless steel.First annular magnetic pole can be made up of the electromagnetic pure iron material having low-coercivity, high magnetic permeability, high saturation magnetic flux density and magnetic aging stable, to reduce remanent magnetism and volume.First permanent-magnetic clamp can be made up of the NdFeB material with higher remanent magnetism, superelevation magnetic energy product and ultra-high coercive force.The diamagnetic filler filled between the tapered portion of two first annular magnetic poles plays and improves seal pressure differential and reduce the effect of leakage field.
The side of close described double, two journal stirrups of described first order sealing device is provided with second level sealing device, described second level sealing device includes the second sealing shell and the corrugated tube in the inner chamber being arranged on the second described sealing shell, one end of the second described sealing shell is fixing with described cylinder barrel to be connected, described second seals the other end of shell and seals, one end of described corrugated tube is sheathed and is fixed on described piston rod, the other end of described corrugated tube is fixed on described second and seals between shell and the described first sealing shell, the inner chamber that described second seals shell is divided into corrugated tube inner chamber and corrugated tube exocoel by described corrugated tube, described corrugated tube inner chamber is all filled with the carrier fluid identical with the carrier fluid in described working chamber with being all filled with in described corrugated tube exocoel in described corrugated tube inner chamber and described corrugated tube exocoel.One end of corrugated tube is fixing on the piston rod, and the other end of corrugated tube is fixed on the second sealing shell and first and seals between shell, and during such piston rod linear reciprocating motion, linear reciprocating motion, other end transfixion are done with piston in one end of corrugated tube.When piston do roping dynamic time, corrugated tube is stretched, and when piston does pressure motion, corrugated tube is compressed.Along with the stretching carried out under the drive of piston repeatedly and compression motion, the carrier fluid in the two ends of corrugated tube and corrugated tube inner chamber keeps geo-stationary with cylinder barrel and piston rod all the time, it does not have wearing and tearing, magnetic flow liquid is difficult to leak at the two ends of corrugated tube；Additionally, first order sealing device is by piston rod working chamber and the corrugated tube isolation in the sealing device of the second level, can effectively stop the magnetic-particle in magnetic flow liquid to enter second level sealing device, reduce the abrasion of corrugated tube, improve the service life of corrugated tube.Although corrugated tube inner chamber and piston rod working chamber likely have a small amount of carrier fluid exchange, but because fluid exchange will not occur for corrugated tube inner chamber and corrugated tube exocoel, thus without the loss leakage that carrier fluid occurs, it is ensured that the performance of magnetic flow liquid will not change, thus realizing better seal effect.The carrier fluid filled in corrugated tube inner chamber with corrugated tube exocoel is identical with the carrier fluid in the magnetic flow liquid filled in piston rod working chamber, corrugated tube can be played lubrication and thermolysis by the carrier fluid in corrugated tube inner chamber and corrugated tube exocoel, can reduce the abrasion of corrugated tube further.
On the basis of first order sealing device, the effect of second level sealing device mainly prevents the carrier fluid in magnetic flow liquid from leaking, and the effect further functioning as the abrasion reducing corrugated tube, improving shock absorber sealing.Even if a small amount of magnetic-particle in the first gap leaks out in corrugated tube inner chamber, also it is difficult in corrugated tube inner chamber and spreads, thus magnetic-particle can be hindered to enter other positions of second level sealing device, while avoiding magnetic-particle that corrugated tube is caused abrasion, the service life of corrugated tube can be increased, and improve the sealing effectiveness of vibroshock further.The Main Function of corrugated tube is to prevent because the carrier fluid in magnetic flow liquid leaks, loses and cause that the physical parameters such as magnetorheological viscosity change, this is because the volume fraction of magnetic-particle is for determine through Theoretical Calculation in magnetic flow liquid, if carrier fluid leaks, the volume fraction of magnetic-particle will change, this necessarily affects the serviceability of magnetic flow liquid, the mechanical property causing magneto-rheological vibration damper changes, and damping property more can be affected.
The outside of described piston rod is welded with retainer ring assembly, described retainer ring assembly includes the first retainer ring and second retainer ring of interlocking, one end of described corrugated tube is fixedly clamped by the first described retainer ring and the second described retainer ring, described second seals shell and threadeds with described cylinder barrel, described second seals the end of shell and is provided with the first packing ring, and the other end of described corrugated tube is sealed shell by the first described packing ring and described second and is fixedly clamped.Retainer ring assembly welding position on the piston rod is determined by the maximum dynamic stroke of magneto-rheological vibration damper.Second seals shell threadeds with cylinder barrel, makes the first sealing shell that screw thread can be relied on to screw power and is fixed on the port of cylinder barrel better, and is easy to the assembling of vibroshock.The end of corrugated tube can be firmly pressed on the first sealing shell by the first packing ring, reduces the leakage of carrier fluid in corrugated tube inner chamber.
Also include third level sealing device, described third level sealing device includes the 3rd sealing shell and the 3rd permanent-magnetic clamp in the inner chamber being arranged on the 3rd described sealing shell, magnetism-isolating loop and two the 3rd annular magnetic poles, described the 3rd seals shell and threadeds with described second other end sealing shell, the other end sealing shell by described second seals, the outer end of the 3rd described sealing shell is threaded hold-down bolt, described magnetism-isolating loop and described two the 3rd annular magnetic poles are all set in the outside of described piston rod, there is between described magnetism-isolating loop and described piston rod the second gap, described magnetism-isolating loop is arranged between described two the 3rd annular magnetic pole, the 3rd described permanent-magnetic clamp is set in the outside of described magnetism-isolating loop, equidistant on the inner surface of each the 3rd described annular magnetic pole it is arranged at intervals with multiple bulge loop being convex to described piston rod, each have third space between described bulge loop and described piston rod, namely multiple gaps between described third space and multiple bulge loop constitute the seal clearance between the 3rd permanent-magnetic clamp and piston rod, it is filled with magnetic fluid in described seal clearance.Third level sealing device, on the basis of first order sealing device and second level sealing device, is mainly used for the inside and outside differential pressure of balance second level sealing device, prevents the leakage of carrier fluid in the sealing device of the second level further and prevent extraneous dust foreign material from entering corrugated tube and causing the abrasion of corrugated tube.Being sealed layer by layer by three grades of first order sealing device, second level sealing device and third level sealing device, it may be achieved better seal effect, these the three grades gross pressures that sealing can seal layer by layer are:
P=P1+P2+P3
Wherein, P1、P2And P3The sealing pressure that respectively first order sealing device, second level sealing device and third level sealing device are shared.
Third level sealing device adopts magnet fluid sealing mechanism, and its sealing principle is identical with first order sealing device, but otherwise varied in structure and performance.Magnetic line of force traverse the 3rd annular magnetic pole that the magnetic field that 3rd permanent-magnetic clamp excites produces, then through the magnetic fluid in the seal clearance between the 3rd annular magnetic pole and piston rod, enter piston rod, pass from piston rod again, magnetic fluid in seal clearance and the 3rd annular magnetic pole, it is eventually returned in the 3rd permanent-magnetic clamp, magnetic loop is formed in whole third level sealing device, high-intensity magnetic field is produced in seal clearance, magnetic fluid generation magnetic rheology effect, magnetic fluid is in seal clearance under the effect of high-intensity magnetic field, its yield strength moment increases several orders of magnitude, present the character of similar solid, magnetic fluid is tightly inhaled in seal clearance, form sealing ring, by fully wrapped around for the piston rod inside the 3rd annular magnetic pole, be equivalent to pin the seal clearance between piston rod and the 3rd annular magnetic pole completely, thus can effectively hinder other materials to pass from seal clearance, realize sealing.
3rd permanent-magnetic clamp has magnetomotive force, it is possible to produces magnetic field, can be made up of NdFeB material.3rd annular magnetic pole is magnetic conductive material, and electromagnetic pure iron material can be adopted to make.3rd sealing shell and magnetism-isolating loop are non-magnet material, the non-magnetic materials such as diamagnetic rustless steel can be adopted to make, such as 316L austenitic stainless steel.Magnetism-isolating loop is mainly used to ensure that the magnetic line of force is concentrated mainly in the gap between multiple bulge loop on the magnetic fluid of filling.
The unilateral cross sectional shape of described bulge loop is trapezoidal.When the unilateral cross sectional shape of bulge loop is trapezoidal, its good sealing effect, is first-selected cross sectional shape.It is of course also possible to adopt other shapes such as rectangle, triangle, to reach good sealing effectiveness.
Described first seals and is provided with O RunddichtringO between shell and the inwall of described cylinder barrel, described second seals and is provided with the second packing ring between shell and the described the 3rd sealing shell, described the 3rd seals and is provided with the 3rd packing ring between shell and described hold-down bolt, it is provided with H839 sealing ring between described hold-down bolt and described piston rod, between the 3rd annular magnetic pole of the outer end of described piston rod, described hold-down bolt and the close described the 3rd sealing shell, is provided with backbone sealing ring.O RunddichtringO can ensure that magnetic flow liquid will not seal leakage between shell and cylinder barrel from first.Second packing ring can ensure that the 3rd sealing shell and the second threaded connection place sealing shell do not leak.3rd packing ring can ensure that hold-down bolt and the 3rd threaded connection place sealing shell do not leak.H839 sealing ring and backbone sealing ring can prevent external impurities from entering seal clearance, still prevent the magnetic fluid in seal clearance and run off.
The mixing liquid that carrier fluid must meet the requirement compared with low viscosity and less density, the common carrier fluid in this area such as silicone oil, water or other viscosity and density relatively low can serve as selection.Silicone oil is first-selected carrier fluid, and its viscosity is low, and density is less, is beneficial to magnetic-particle and spreads and be dispersed in carrier fluid, and silicone oil will not corrode corrugated tube, and lubrication and radiating effect are better.
Described corrugated tube is the corrugated tube that hydrogenated nitrile-butadiene rubber is made.The service life that it is critical only that corrugated tube of second level sealing device, and the service life of corrugated tube is relevant with the fatigue properties of selected material.The reason of the corrugated tube that the preferred hydrogenated nitrile-butadiene rubber of the present invention is made is in that, hydrogenated nitrile-butadiene rubber corrugated tube mechanical strength is high, and abrasion resistance properties, oil resistivity, hot water resistance, resistance to lubricating oil and hydraulic pressure resistant oil are functional.The wearability of hydrogenated nitrile-butadiene rubber is 1.8 times of common nitrile rubber, be fluorubber, 2.5 times of acrylate rubber；Oil resistivity is suitable with fluorubber；Acid resistance, gasproof oiliness can be 5 times of common nitrile rubber；Resistance to lubricating oil and the refrigerant performance of resistance to non-Freon are good；To various lube oil additives and to hydrogen sulfide stable performance；And tolerance to cold is better than fluorubber, it is suitable for making the sealing article used under dynamic and static working condition.The working range of hydrogenated nitrile-butadiene rubber is big, and it uses temperature to may be up to 170 DEG C, and can at 150 DEG C of temperature life-time service.
The outer surface of described piston rod and described second seals and is provided with resistant to elevated temperatures anti-sticky Lubricant coating material layer on the inner surface of shell.This anti-sticky Lubricant coating material layer is directly coated on the outer surface of piston rod and the inner surface of the second sealing shell by resistant to elevated temperatures anti-sticky Lubricant coating material, formed through hot setting, the inner surface that the outer surface and second that can make piston rod seals shell is smooth, reduce the abrasion to piston rod and corrugated tube so that it is longer service life.
Compared with prior art, it is an advantage of the current invention that: magneto-rheological vibration damper disclosed by the invention, good sealing effect, the magnetic-particle in magnetic flow liquid in adsorbable entrance the first gap of high-intensity magnetic field formed between two first annular magnetic pole and piston rod, form firmly sealing ring, thus can effectively stop the continuation of magnetic-particle to external diffusion, reduce the abrasion of vibroshock, setting up sealing of effectively resistance to wearing, the diamagnetic filler filled between the tapered portion of two first annular magnetic poles has the effect improving seal pressure differential and reduction leakage field.First order sealing device acts primarily as the effect sealed of resistance to wearing, and increases service life of vibroshock, also has simultaneously and shares the effect sealing pressure.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment magneto-rheological vibration damper；
Fig. 2 is A place enlarged drawing in Fig. 1；
Fig. 3 is C place enlarged drawing in Fig. 2；
Fig. 4 is B place enlarged drawing in Fig. 1；
Fig. 5 is D place enlarged drawing in Fig. 4.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Magneto-rheological vibration damper as depicted, including cylinder barrel 1, the inner chamber of cylinder barrel 1 is provided with piston 2 and piston rod 21, the arranged outside of piston 2 has permanent-magnetic clamp 22 and magnet exciting coil 23, piston rod 21 can do linear reciprocating motion in a working chamber 24, working chamber 24 is filled with magnetic flow liquid, magnetic flow liquid is made up of magnetic-particle and dimethicone, the side of working chamber 24 is provided with seal 25, the arranged outside of seal 25 has rear end cap 26, rear end cap 26 has been wholely set single journal stirrup 27, the other end of piston rod 21 is connected to double, two journal stirrup 28, the port of export of piston rod 21 is provided with first order sealing device, second level sealing device and third level sealing device.
First order sealing device is arranged on one end of the working chamber 24 of cylinder barrel 1, first order sealing device includes the first sealing shell 31 and the first permanent-magnetic clamp 32 being arranged in the inner chamber of the first sealing shell 31 and two first annular magnetic poles 33, first seals shell 31 is set in the outside of piston rod 21, it is provided with O RunddichtringO 34 between first sealing shell 31 and the inwall of cylinder barrel 1, each first annular magnetic pole 33 includes the ring part 331 that is wholely set and overhanging tapered portion 332, tapered portion 332 is set in outside piston rod 21, there is between tapered portion 332 and piston rod 21 first gap 211, two first annular magnetic poles 33 are oppositely arranged, the tapered portion 332 of two first annular magnetic poles 33 is adjacent, first permanent-magnetic clamp 32 is arranged between the ring part 331 of two first annular magnetic poles 33, diamagnetic filler 35 it is filled with between the tapered portion 332 of two first annular magnetic poles 33.
Second level sealing device is arranged on the side near double, two journal stirrups 28 of first order sealing device, second level sealing device includes the corrugated tube 42 that the second sealing shell 41 is made with the hydrogenated nitrile-butadiene rubber being arranged in the inner chamber of the second sealing shell 41, one end of second sealing shell 41 is fixing with cylinder barrel 1 to be connected, second other end sealing shell 41 seals, the outside of piston rod 21 is welded with retainer ring assembly, retainer ring assembly includes the first retainer ring 45 and the second retainer ring 46 of interlocking, one end of corrugated tube 42 is fixedly clamped by the first retainer ring 45 and the second retainer ring 46, second seals shell 41 threadeds with cylinder barrel 1, second end sealing shell 41 is provided with the first packing ring 47, the other end of corrugated tube 42 is fixedly clamped by the first packing ring 47 and the second sealing shell 41, the inner chamber that second seals shell 41 is divided into corrugated tube inner chamber 43 and corrugated tube exocoel 44 by corrugated tube 42, corrugated tube inner chamber 43 and corrugated tube exocoel 44 are all filled with dimethicone.
Third level sealing device includes the 3rd sealing shell 51 and the 3rd permanent-magnetic clamp 52 being arranged in the 3rd inner chamber sealing shell 51, magnetism-isolating loop 53 and two the 3rd annular magnetic poles 54, 3rd seals shell 51 threadeds with second other end sealing shell 41, it is provided with the second packing ring 55 between second sealing shell 41 and the 3rd sealing shell 51, the other end sealing shell 41 by second seals, the outer end of the 3rd sealing shell 51 is threaded hold-down bolt 56, it is provided with the 3rd packing ring 57 between 3rd sealing shell 51 and hold-down bolt 56, H839 sealing ring 58 it is provided with between hold-down bolt 56 and piston rod 21, piston rod 21, it is provided with backbone sealing ring 59 between 3rd annular magnetic pole 54 of the outer end of hold-down bolt 56 and close 3rd sealing shell 51, magnetism-isolating loop 53 and two the 3rd annular magnetic poles 54 are all set in the outside of piston rod 21, there is between magnetism-isolating loop 53 and piston rod 21 second gap 212, magnetism-isolating loop 53 is arranged between two the 3rd annular magnetic poles 54, 3rd permanent-magnetic clamp 52 is set in the outside of magnetism-isolating loop 53, equidistant on the inner surface of each 3rd annular magnetic pole 54 it is arranged at intervals with multiple bulge loop 541 being convex to piston rod, the unilateral cross sectional shape of bulge loop 541 is trapezoidal, between each bulge loop 541 and piston rod 21, there is third space 213, namely gap 542 between multiple third spaces 213 and multiple bulge loop 541 constitutes the seal clearance between the 3rd permanent-magnetic clamp 542 and piston rod 21, magnetic fluid it is filled with in seal clearance.
In above-described embodiment, the outer surface and second of piston rod 21 seals and is provided with resistant to elevated temperatures anti-sticky Lubricant coating material layer on the inner surface of shell 41.
Carrier fluid in above-described embodiment is except dimethicone, it is also possible to be other silicone oil, water or other viscosity and the relatively low mixing liquid of density.
First order sealing device is excited magnetic energy by the first permanent-magnetic clamp 32, form magnetic loop through the first gap 211 two first annular magnetic poles 33, piston rod 21 and two first annular magnetic poles 33 and piston rod 21, between two first annular magnetic poles 33 and piston rod 21, form high-intensity magnetic field.When piston rod 21 does linear reciprocating motion, magnetic flow liquid in its working chamber 24 also can move, the high pressure magnetic flow liquid formed can impact the one side of the first sealing shell 31, cause that part magnetic flow liquid enters in the first gap 211 under the effect of the pressure, the existence of the high-intensity magnetic field owing to being formed between above-mentioned two first annular magnetic poles 33 and piston rod 21, the magnetic-particle in magnetic flow liquid in adsorbable entrance the first gap 211 of this high-intensity magnetic field, form firmly sealing ring, thus can effectively stop the continuation of magnetic-particle to external diffusion, reduce the abrasion of vibroshock, set up sealing of effectively resistance to wearing.
Even if a small amount of magnetic-particle in the first gap 211 leaks out in corrugated tube inner chamber 43, also it is difficult in corrugated tube inner chamber 43 and spreads, thus magnetic-particle can be hindered to enter other positions of second level sealing device, while avoiding magnetic-particle that corrugated tube 42 is caused abrasion, the service life of corrugated tube 42 can be increased, and improve the sealing effectiveness of vibroshock further.
Magnetic line of force traverse the 3rd annular magnetic pole 54 that the magnetic field that 3rd permanent-magnetic clamp excites produces, then through the magnetic fluid in the seal clearance between the 3rd annular magnetic pole 54 and piston rod 21, enter piston rod 21, pass from piston rod 21 again, magnetic fluid in seal clearance and the 3rd annular magnetic pole 54, it is eventually returned in the 3rd permanent-magnetic clamp 52, magnetic loop is formed in whole third level sealing device, high-intensity magnetic field is produced in seal clearance, magnetic fluid generation magnetic rheology effect, magnetic fluid is in seal clearance under the effect of high-intensity magnetic field, its yield strength moment increases several orders of magnitude, present the character of similar solid, magnetic circulation is tightly inhaled in seal clearance, form sealing ring, by fully wrapped around for the piston rod 21 inside the 3rd annular magnetic pole 54, be equivalent to pin the seal clearance between piston rod 21 and the 3rd annular magnetic pole 54 completely, thus can effectively hinder other materials to pass from seal clearance, realize sealing.Third level sealing device, on the basis of first order sealing device and second level sealing device, is mainly used for the inside and outside differential pressure of balance second level sealing device, prevents the leakage of carrier fluid in the sealing device of the second level further and prevent extraneous dust foreign material from entering corrugated tube 42 and causing the abrasion of corrugated tube 42.Being sealed layer by layer by three grades of first order sealing device, second level sealing device and third level sealing device, it may be achieved better seal effect, these the three grades gross pressures that sealing can seal layer by layer are:
P=P1+P2+P3
Wherein, P1、P2And P3The sealing pressure that respectively first order sealing device, second level sealing device and third level sealing device are shared.
Claims (6)
1. a magneto-rheological vibration damper, including cylinder barrel, the inner chamber of described cylinder barrel is provided with piston and piston rod, the arranged outside of described piston has permanent-magnetic clamp and magnet exciting coil, described piston rod can do linear reciprocating motion in a working chamber, described working chamber is filled with magnetic flow liquid, described magnetic flow liquid is made up of magnetic-particle and carrier fluid, the side of described working chamber is provided with seal, the arranged outside of described seal has rear end cap, described rear end cap is provided with single journal stirrup, the other end of described piston rod is connected to double, two journal stirrup, it is characterized in that the port of export of described piston rod is provided with first order sealing device, described first order sealing device is arranged on one end of the working chamber of described cylinder barrel, described first order sealing device includes the first sealing shell and the first permanent-magnetic clamp in the inner chamber being arranged on the first described sealing shell and two first annular magnetic poles, described first seals casing and is located at the outside of described piston rod, each described first annular magnetic pole includes the ring part that is wholely set and overhanging tapered portion, described tapered portion is set in outside described piston rod, there is between described tapered portion and described piston rod the first gap, two described first annular magnetic poles are oppositely arranged, the tapered portion of two described first annular magnetic poles is adjacent, the first described permanent-magnetic clamp is arranged between the ring part of the first annular magnetic pole of described two, it is filled with diamagnetic filler between the tapered portion of two described first annular magnetic poles；The side of close described double, two journal stirrups of described first order sealing device is provided with second level sealing device, described second level sealing device includes the second sealing shell and the corrugated tube in the inner chamber being arranged on the second described sealing shell, one end of the second described sealing shell is fixing with described cylinder barrel to be connected, described second seals the other end of shell and seals, one end of described corrugated tube is sheathed and is fixed on described piston rod, the other end of described corrugated tube is fixed on described second and seals between shell and the described first sealing shell, the inner chamber that described second seals shell is divided into corrugated tube inner chamber and corrugated tube exocoel by described corrugated tube, described corrugated tube inner chamber is all filled with the carrier fluid identical with the carrier fluid in described working chamber with in described corrugated tube exocoel；The outer surface of described piston rod and described second seals and is provided with resistant to elevated temperatures anti-sticky Lubricant coating material layer on the inner surface of shell.
2. a kind of magneto-rheological vibration damper according to claim 1, it is characterized in that the outside of described piston rod is welded with retainer ring assembly, described retainer ring assembly includes the first retainer ring and second retainer ring of interlocking, one end of described corrugated tube is fixedly clamped by the first described retainer ring and the second described retainer ring, described second seals shell and threadeds with described cylinder barrel, described second seals the end of shell and is provided with the first packing ring, and the other end of described corrugated tube is sealed shell by the first described packing ring and described second and is fixedly clamped.
3. a kind of magneto-rheological vibration damper according to claim 1 and 2, characterized by further comprising third level sealing device, described third level sealing device includes the 3rd sealing shell and the 3rd permanent-magnetic clamp in the inner chamber being arranged on the 3rd described sealing shell, magnetism-isolating loop and two the 3rd annular magnetic poles, described the 3rd seals shell and threadeds with described second other end sealing shell, the other end sealing shell by described second seals, the outer end of the 3rd described sealing shell is threaded hold-down bolt, described magnetism-isolating loop and described two the 3rd annular magnetic poles are all set in the outside of described piston rod, there is between described magnetism-isolating loop and described piston rod the second gap, described magnetism-isolating loop is arranged between described two the 3rd annular magnetic pole, the 3rd described permanent-magnetic clamp is set in the outside of described magnetism-isolating loop, equidistant on the inner surface of each the 3rd described annular magnetic pole it is arranged at intervals with multiple bulge loop being convex to described piston rod, each have third space between described bulge loop and described piston rod, namely multiple gaps between described third space and multiple bulge loop constitute the seal clearance between the 3rd permanent-magnetic clamp and piston rod, it is filled with magnetic fluid in described seal clearance.
4. a kind of magneto-rheological vibration damper according to claim 3, it is characterised in that the unilateral cross sectional shape of described bulge loop is trapezoidal.
5. a kind of magneto-rheological vibration damper according to claim 3, it is characterized in that described first seals and be provided with O RunddichtringO between shell and the inwall of described cylinder barrel, described second seals and is provided with the second packing ring between shell and the described the 3rd sealing shell, described the 3rd seals and is provided with the 3rd packing ring between shell and described hold-down bolt, H839 sealing ring it is provided with between described hold-down bolt and described piston rod, described piston rod, it is provided with backbone sealing ring between 3rd annular magnetic pole of the outer end of described hold-down bolt and the close described the 3rd sealing shell.
6. a kind of magneto-rheological vibration damper according to claim 3, it is characterised in that described corrugated tube is the corrugated tube that hydrogenated nitrile-butadiene rubber is made.
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| CN201510010251.2A CN104595407B (en) | 2015-01-09 | 2015-01-09 | A kind of magneto-rheological vibration damper |
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| CN201510010251.2A CN104595407B (en) | 2015-01-09 | 2015-01-09 | A kind of magneto-rheological vibration damper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106402254B (en) * | 2016-11-18 | 2018-05-01 | 合肥工业大学 | A kind of valve type magneto-rheological fluid suspension of internal bypass road |
| CN108626243B (en) * | 2017-03-22 | 2021-06-11 | 舍弗勒技术股份两合公司 | Linear guide system, linear guide device, control device and control method thereof |
| CN107327437B (en) * | 2017-08-01 | 2024-04-19 | 沈阳玉衡科技有限公司 | Composite material hydraulic cylinder body with filling framework and manufacturing method thereof |
| CN110005772B (en) * | 2019-03-25 | 2020-07-07 | 山东科技大学 | Permanent magnet type magnetorheological fluid transmission device |
| CN112984030B (en) * | 2021-03-03 | 2022-04-19 | 重庆大学 | Magnetorheological damper with corrugated pipe deformation suction and discharge function |
| CN114017459A (en) * | 2021-10-25 | 2022-02-08 | 中国劳动关系学院 | Arc-shaped alternating field magnetorheological fluid damper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5284330A (en) * | 1992-06-18 | 1994-02-08 | Lord Corporation | Magnetorheological fluid devices |
| CN2496698Y (en) * | 2001-08-27 | 2002-06-26 | 上海汇众汽车制造有限公司 | Wear and leakage-resistance apparatus of magnetic rheological fluid damper |
| US6896109B2 (en) * | 2003-04-07 | 2005-05-24 | Csa Engineering, Inc. | Magnetorheological fluid vibration isolator |
| CN203516580U (en) * | 2013-09-13 | 2014-04-02 | 宁波大学 | Self-sealing magnetorheological damper |
| CN204403251U (en) * | 2015-01-09 | 2015-06-17 | 宁波大学 | A kind of magneto-rheological vibration damper |
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