CN112392888B - Magnetic liquid vibration damper - Google Patents
Magnetic liquid vibration damper Download PDFInfo
- Publication number
- CN112392888B CN112392888B CN202011254829.6A CN202011254829A CN112392888B CN 112392888 B CN112392888 B CN 112392888B CN 202011254829 A CN202011254829 A CN 202011254829A CN 112392888 B CN112392888 B CN 112392888B
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- magnetic liquid
- cavity
- pipe
- porous medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
- F16F6/005—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid using permanent magnets only
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
- F16F7/112—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on fluid springs
Abstract
The invention provides a magnetic liquid shock absorber which comprises a shell, an end cover, a first porous medium piece and a first permanent magnet, wherein the end cover is connected with the shell, a first inner cavity is defined between the end cover and the shell, the first porous medium piece is arranged in the first inner cavity, first magnetic liquid is filled in pores of the first porous medium piece, the first permanent magnet is movably arranged in the first inner cavity, and the first permanent magnet can be matched with the first magnetic liquid so as to drive the first magnetic liquid to move relative to the first porous medium piece. The magnetic liquid shock absorber provided by the invention has the advantages of good shock absorption effect and stable shock absorption effect.
Description
Technical Field
The invention relates to the technical field of mechanical engineering vibration, in particular to a magnetic liquid shock absorber.
Background
In the field of aerospace, because a spacecraft is limited by energy, a passive damper is very suitable for being adopted, and particularly, low-frequency and small-amplitude vibration generated by a long and straight object in the spacecraft, such as vibration of an antenna and a solar panel, is a difficult problem of damping. The magnetic liquid damper has the characteristics of zero energy consumption, sensitivity to inertial force, simple structure, high damping speed and long service life, is a passive damper suitable for low-frequency and small-amplitude vibration, and is particularly suitable for low-frequency and small-amplitude vibration of long and straight objects in the aerospace field. In addition, the magnetic liquid damper also has wide application prospects in ground systems, such as vibration damping of vibration isolation platforms and high-power antennas.
However, in the existing magnetic liquid damper, the brittleness of the permanent magnet material is high, and the spacecraft can undergo a greatly accelerated process during launching, so that collision is likely to be caused, and the permanent magnet is broken. In addition, the magnetic liquid damper has fewer friction surfaces with damping effect, poor damping effect and the like.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides the magnetic liquid shock absorber which has the advantages of good shock absorption effect and stable shock absorption effect.
The magnetic liquid vibration absorber comprises a shell, an end cover, a first porous medium piece and a first permanent magnet, wherein the end cover is connected with the shell, and a first inner cavity is defined between the end cover and the shell; the first porous medium piece is arranged in the first inner cavity, and first magnetic liquid is filled in pores of the first porous medium piece; the first permanent magnet is movably arranged in the first inner cavity and can be matched with the first magnetic liquid so as to drive the first magnetic liquid to move relative to the first porous medium piece.
In some embodiments, the magnetic liquid vibration absorber further comprises a mounting tube disposed within the first interior cavity, the mounting tube extending in a first direction, wherein the first porous media member is disposed within the mounting tube and the first magnetic liquid is disposed within the mounting tube.
In some embodiments, the mounting tube is a circular tube, the first permanent magnet is annular, the first porous medium piece is annular, the axial direction of the mounting tube, the axial direction of the first porous medium piece and the axial direction of the first permanent magnet are consistent with the first direction, and the first permanent magnet is sleeved on the mounting tube; or each of the outer edge and the inner edge of the cross section of the installation pipe is polygonal, the outer peripheral surface of the installation pipe forms a plurality of outer side surfaces, the first permanent magnet comprises a plurality of sheet-shaped permanent magnets, and each outer side surface is opposite to at least one sheet-shaped permanent magnet.
In some embodiments, the first lumen has first and second side walls opposite in the first direction, the first side wall having a first protrusion thereon and the second side wall having a second protrusion thereon, wherein the mounting tube has first and second ends opposite in the first direction, the first protrusion extending into the first end and the second protrusion extending into the second end, optionally, the first protrusion has a dimension in the first direction of 1/30-1/15 of a dimension of the first lumen in the first direction, and the second protrusion has a dimension in the first direction of 1/30-1/15 of a dimension of the first lumen in the first direction.
In some embodiments, the magnetic liquid damper further comprises a connector, a second permanent magnet, a second magnetic liquid and a second porous medium piece, wherein the second permanent magnet is connected with the first permanent magnet through the connector; the second magnetic liquid is arranged in the first inner cavity, the second magnetic liquid is adsorbed on the second permanent magnet, and the second magnetic liquid is in contact with the wall surface of the first inner cavity; the second porous medium piece is arranged on at least one of the second permanent magnet and the connecting piece, and a part of the second magnetic liquid is filled in pores in the second porous medium piece.
In some embodiments, the first inner cavity comprises a first cavity section, a second cavity section and a third cavity section arranged in sequence along the first direction, the area of the cross section of the first cavity section decreases along a direction away from the second cavity section, the area of the cross section of the third cavity section decreases along a direction away from the second cavity section, optionally, the diameter of the cross section of the first cavity section decreases along a direction away from the second cavity section, and the diameter of the cross section of the third cavity section decreases along a direction away from the second cavity section.
In some embodiments, the connecting member is a connecting pipe, the connecting pipe extends along the first direction, the connecting pipe is sleeved on the first permanent magnet, the connecting pipe is a circular pipe, the mounting pipe is a circular pipe, the first porous medium piece is circular ring-shaped, the first permanent magnet is circular ring-shaped, the axial direction of the mounting pipe, the axial direction of the first porous medium piece and the axial direction of the first permanent magnet are consistent with the first direction, the first permanent magnet is sleeved on the mounting pipe, optionally, the outer diameter of the first permanent magnet is 1/3-3/5 of the diameter of the second cavity section, the inner diameter of the first permanent magnet is 3/10-1/2 of the diameter of the second cavity section, optionally, the outer diameter of the mounting pipe is 1/5-2/5 of the diameter of the second cavity section, the inner diameter of the installation tube is 2/3-9/10 of the outer diameter of the installation tube, and the length of the installation tube is equal to the size of the first inner cavity in the first direction; or, each of the outer edge and the inner edge of the cross section of the mounting tube is polygonal, the outer peripheral surface of the mounting tube forms a plurality of outer side surfaces, the inner edge of the cross section of the connecting tube is polygonal, the inner peripheral surface of the connecting tube forms a plurality of mounting surfaces corresponding to the outer side surfaces one to one, wherein the first permanent magnet comprises a plurality of sheet-shaped permanent magnets, each mounting surface is provided with at least one sheet-shaped permanent magnet, each outer side surface is opposite to at least one sheet-shaped permanent magnet, optionally, the inner edge of the cross section of the connecting tube is regular polygon, the sheet-shaped permanent magnets are cuboid-shaped, the diameter of a circumscribed circle of the regular polygon formed by the inner edge of the cross section of the connecting tube is 1/3-3/5 of the diameter of the second cavity section, and the length of the sheet-shaped permanent magnets is equal to the, the width of the sheet-shaped permanent magnet is 1/2-9/10 of the side length of a regular polygon formed by the inner edge of the cross section of the connecting pipe, and the height of the sheet-shaped permanent magnet is 1/30-1/6 of the diameter of the second cavity section.
In some embodiments, a dimension of the first cavity section in the first direction is equal to a dimension of the third cavity section in the first direction, optionally, the first cavity section and the third cavity section are each frustoconical.
In some embodiments, the connecting member is a connecting pipe, the connecting pipe is a circular pipe, the second porous medium piece is in a circular ring shape, the second permanent magnet is in a circular ring shape, the second porous medium piece is sleeved on the second permanent magnet, the second permanent magnet is sleeved on the connecting pipe, optionally, the outer diameter of the second permanent magnet is 2/3-3/4 of the diameter of the second cavity section, the inner diameter of the second permanent magnet is 1/2-2/3 of the diameter of the second cavity section, the outer diameter of the second porous medium piece is 5/7-9/10 of the diameter of the second cavity section, the outer diameter of the second porous medium piece is greater than the minimum diameter of the first cavity section, the outer diameter of the second porous medium piece is greater than the minimum diameter of the third cavity section, optionally, the second permanent magnets are multiple, the second permanent magnets are arranged in the first direction at intervals, the second porous medium pieces are multiple, and the second porous medium pieces are arranged on the second permanent magnets in a one-to-one correspondence mode.
In some embodiments, the first porous medium member is made of at least one of sponge, carbon foam, and copper foam, and the second porous medium member is made of at least one of sponge, carbon foam, and copper foam.
Drawings
FIG. 1 is a schematic diagram of a magnetic liquid vibration damper according to an embodiment of the present invention.
Reference numerals:
the filter comprises a shell 1, a first inner cavity 101, a first cavity section 1011, a second cavity section 1012, a third cavity section 1013, a mounting pipe 2, a first porous medium part 3, a connecting part 4, a connecting pipe 4a, a first permanent magnet 5, a second permanent magnet 6, second magnetic liquid 7, a second porous medium part 8, a first end cover 9, a first vent hole 901, a first protrusion 902, a second end cover 10, a second vent hole 1001, a second protrusion 1002, a first filter screen 11, a second filter screen 12, a first seal ring 13, a second seal ring 14 and first magnetic liquid 15.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A magnetic liquid vibration damper according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the magnetic liquid vibration absorber according to the embodiment of the present invention includes a housing 1, an end cap, a first porous medium member 3, and a first permanent magnet 5. The end cap is connected to the housing 1, and a first inner cavity 101 is defined between the end cap and the housing 1. The first porous medium member 3 is disposed in the first cavity 101, and the pores of the first porous medium member 3 are filled with the first magnetic liquid 15. The first permanent magnet 5 is movably arranged in the first inner cavity 101, and the first permanent magnet 5 can be matched with the first magnetic liquid 15 so as to drive the first magnetic liquid 15 to move relative to the first porous medium piece 3.
According to the magnetic liquid damper provided by the embodiment of the invention, when the first permanent magnet 5 moves in the first inner cavity 101, the first permanent magnet 5 drives the first magnetic liquid 15 located in the first inner cavity 101 to move relative to the mounting pipe 2, the first magnetic liquid 15 has a magnetic liquid layer with a velocity gradient, the first magnetic liquids 15 with different moving speeds are sheared and rubbed with each other, mechanical energy is converted into heat energy, the first magnetic liquid 15 is enabled to be viscous and consume energy, and the damping effect is increased.
The first porous medium piece 3 is arranged, and the first magnetic liquid 15 is filled in the pores of the first porous medium piece 3, so that on one hand, the solid-liquid contact area is increased, meanwhile, the velocity gradient in the first magnetic liquid 15 is increased, the friction energy consumption and the viscous energy consumption are increased, and the vibration reduction effect is further increased.
Meanwhile, the flow rates of the first magnetic liquids 15 passing through different pores of the first porous medium piece 3 are different, and the first magnetic liquids 15 with different flow rates can be sheared and rubbed with each other when meeting, so that mechanical energy is converted into heat energy, energy can be consumed by viscosity in the first magnetic liquids 15, and the vibration reduction effect is further improved.
In addition, by arranging the first magnetic liquid 15 to be accommodated in the pores of the first porous medium piece 3, the volatilization of the first magnetic liquid 15 can be reduced, and the vibration reduction effect of the magnetic liquid vibration reducer is more stable.
Therefore, the magnetic liquid damper provided by the embodiment of the invention has the advantages of good damping effect, stable damping effect and the like.
It should be noted that the end cap and the housing 1 are made of non-magnetic material, and in order to reduce the weight, a material with low density, such as acrylic or aluminum, is preferably used. The type of the first magnetic liquid 15 is selected according to actual working conditions, such as ester-based magnetic liquid, engine oil-based magnetic liquid, fluoroether oil-based magnetic liquid, and the like.
For ease of understanding, arrow a in fig. 1 indicates the left-right direction of the magnetic liquid damper, and arrow B in fig. 1 indicates the up-down direction of the magnetic liquid damper.
As shown in fig. 1, the magnetic fluid vibration damping device includes a housing 1, an end cap, a first permanent magnet 5, a first magnetic fluid 15, a first porous medium member 3, a second permanent magnet 6, a second magnetic fluid 7, a second porous medium member 8, a first seal ring 13, and a second seal ring 14.
In some embodiments, the magnetic liquid vibration absorber further comprises a mounting tube 2, the mounting tube 2 being disposed within the first inner chamber 101, the mounting tube 2 extending in a first direction, wherein the first porous medium member 3 is disposed within the mounting tube 2, and the first magnetic liquid 15 is disposed within the mounting tube 2. Therefore, under the adsorption of the first permanent magnet 5, the first magnetic liquid 15 fills the pores of the first porous medium piece 3 and partially abuts against the inner wall of the mounting pipe 2, so that the friction area between the first magnetic liquid 15 and the solid surface is further increased, the velocity gradient in the first magnetic liquid 15 is further increased, and the vibration reduction effect of the magnetic liquid vibration reducer is further improved. Moreover, the installation tube 2 realizes the limitation of the first magnetic liquid 15, so that most of the first magnetic liquid 15 is filled in the pores of the first porous medium piece 3, and the first magnetic liquid cannot be separated from the pores of the first porous medium under the adsorption of the first permanent magnet 5 and is directly adsorbed on the first permanent magnet 5.
Specifically, the installation pipe 2 extends along the left-right direction, the first permanent magnet 5 is arranged outside the installation pipe 2 and adjacent to the outer wall of the installation pipe 2, and the first porous medium piece 3 is attached to the inner wall of the installation pipe 2.
In some embodiments, the mounting tube 2 is a circular tube, the first permanent magnet 5 is circular ring-shaped, and the first porous medium member 3 is circular ring-shaped. The axial direction of the installation pipe 2, the axial direction of the first porous medium piece 3 and the axial direction of the first permanent magnet 5 are consistent with the first direction, and the first permanent magnet 5 is sleeved on the installation pipe 2.
From this, first permanent magnet 5 all has stronger adsorption affinity to first magnetic fluid 15 in each position of installation pipe 2, and each position of the inner wall of installation pipe 2 also has first porous medium piece 3 that can hold first magnetic fluid 15, and first magnetic fluid 15 in the installation pipe 2 can adsorb in the pore of first porous medium more under the attraction of first permanent magnet 5, has increased the friction area of first magnetic fluid 15 and solid surface, and then further improves the damping effect of magnetic fluid shock absorber.
Specifically, the outer diameter of the first porous medium member 3 is substantially equal to the inner diameter of the mounting pipe 2, and the first porous medium member 3 is fixed in the mounting pipe 2 by means of adhesion, transition fit, interference fit, or the like.
Alternatively, each of the outer and inner edges of the cross section of the mounting tube 2 is polygonal, the outer circumferential surface of the mounting tube 2 forms a plurality of outer side surfaces, and the first permanent magnet 5 includes a plurality of sheet-shaped permanent magnets, each of the outer side surfaces being opposed to at least one of the sheet-shaped permanent magnets. Therefore, the first permanent magnet 5 and the outer wall of the mounting pipe 2 opposite to the first permanent magnet 5 are also ensured to be substantially parallel to each other, so that the first magnetic liquid 15 in the mounting pipe 2 can be more uniformly adsorbed on the inner wall of the mounting pipe 2 under the attraction of the first permanent magnet 5, and the vibration reduction effect of the magnetic liquid vibration reducer is further ensured.
Specifically, the sheet-like permanent magnets and the corresponding outer side faces are parallel to each other, and it is preferable that each outer side face is disposed to oppose one sheet-like permanent magnet, and at this time, two adjacent sheet-like permanent magnets are disposed at an interval.
In some embodiments, the first cavity 101 has a first sidewall surface and a second sidewall surface opposite to each other in the first direction, the first sidewall surface is provided with a first protrusion 902, and the second sidewall surface is provided with a second protrusion 1002. Wherein the mounting tube 2 has a first end and a second end opposite in a first direction, a first protrusion 902 extending into the first end and a second protrusion 1002 extending into the second end. Thus, the first protrusion 902 and the second protrusion 1002 complete the relative fixation of the mounting tube 2 to the housing 1 and the end cap.
Specifically, the first protrusion 902 and the second protrusion 1002 are both cylindrical, the diameter of the first protrusion 902 and the second protrusion 1002 is equal to the inner diameter of the mounting tube 2, and the axis of the first protrusion 902, the axis of the second protrusion 1002, and the axis of the second cavity 1012 are substantially coincident.
Optionally, the dimension of the first protrusion 902 in the first direction is 1/30-1/15 of the dimension of the first lumen 101 in the first direction, and the dimension of the second protrusion 1002 in the first direction is 1/30-1/15 of the dimension of the first lumen 101 in the first direction. Therefore, when the first protrusion 902 and the second protrusion 1002 complete the limiting of the installation pipe 2, it is also ensured that the first magnetic liquid 15 does not interfere with the first protrusion 902 and the second protrusion 1002 when the first permanent magnet 5 moves to the maximum amplitude in the left and right directions, so as to ensure the vibration reduction effect of the first magnetic liquid 15 on the magnetic liquid vibration reducer.
It should be noted that the housing 1 is provided with openings at the left end and the right end, and the number of the end caps is two and is respectively the first end cap 9 and the second end cap 10. A first end cap 9 is attached to the housing 1 to close the left end opening and a second end cap 10 is attached to the housing 1 to close the right end opening. The first sidewall surface at this time is formed on the first end cap 9, and the second sidewall surface is formed on the second end cap 10.
In some embodiments, the magnetic liquid damper further comprises a first seal ring 13 and a second seal ring 14, the first end cap 9 is connected with the housing 1 through bolts, and the first seal ring 13 is sandwiched between the first end cap 9 and the housing 1. The second end cap 10 is connected to the housing 1 by bolts, and the second seal ring 14 is interposed between the second end cap 10 and the housing 1. Therefore, the first sealing ring 13 ensures the sealing of the joint of the first end cover 9 and the shell 1, and the second sealing ring 14 ensures the sealing of the joint of the second end cover 10 and the shell 1, so as to avoid the second magnetic liquid 7 from leaking from the joint of the first end cover 9 and the shell 1 and the joint of the second end cover 10 and the shell 1 to influence the vibration reduction effect of the magnetic liquid vibration reducer.
The first sealing ring 13 and the second sealing ring 14 are both O-shaped rings made of rubber, and the left end face and the right end face of the shell 1 are both provided with annular clamping grooves for clamping the O-shaped rings.
In some embodiments, the first sidewall surface is provided with a first vent 901 for communicating the first cavity 101 with the outside, and the second sidewall surface is provided with a second vent 1001 for communicating the first cavity 101 with the outside. From this, guarantee that the cavity between first end cover 9 and the second permanent magnet 6 that is closest to first end cover 9 communicates with the external world, guarantee that the cavity between second end cover 10 and the second permanent magnet 6 that is closest to second end cover 10 communicates with the external world, and then guarantee that magnetic liquid shock absorber has higher sensitivity.
Optionally, the magnetic liquid damper further includes a first screen 11 and a second screen 12, the first screen 11 is disposed on the first sidewall surface, the first screen 11 covers the first vent hole 901, the second screen 12 is disposed on the second sidewall surface, and the second screen 12 covers the second vent hole 1001. Therefore, the first filter screen 11 and the second filter screen 12 are used for preventing external dust from entering the inner cavity to pollute the second magnetic liquid 7, and further ensuring the vibration reduction effect of the magnetic liquid vibration reducer.
Specifically, the first filter 11 is circular and has a diameter 1.05 to 1.5 times the inner diameter of the first vent 901, and the second filter 12 is circular and has a diameter 1.05 to 1.5 times the inner diameter of the second vent 1001. The first filter screen 11 and the second filter screen 12 are made of non-magnetic materials, such as non-magnetic stainless steel, acrylic, aluminum or plastic.
In some embodiments, the magnetic liquid damper further comprises a connecting member 4, a second permanent magnet 6, a second magnetic liquid 7 and a second porous medium member 8, the second permanent magnet 6 being connected to the first permanent magnet 5 through the connecting member 4. The second magnetic liquid 7 is arranged in the first inner cavity 101, the second magnetic liquid 7 is adsorbed on the second permanent magnet 6, and the second magnetic liquid 7 is in contact with the wall surface of the first inner cavity 101. The second porous medium member 8 is provided on at least one of the second permanent magnet 6 and the connection member 4, and a part of the second magnetic liquid 7 is filled in the pores in the second porous medium member 8.
Therefore, the second permanent magnet 6 also serves as a vibration damping mass, and when the connecting piece 4 and the first permanent magnet 5 move in the first inner cavity 101 relative to the mounting pipe 2 in the first direction, the connecting piece 4 also drives the second permanent magnet 6 to move in the first inner cavity 101 relative to the mounting pipe 2. The second permanent magnet 6 drives part of the second magnetic liquid 7 to move along with the second permanent magnet 6 relatively quickly. The part of the second magnetic liquid 7 in contact with the wall surface of the shell 1 is immobile or moves slowly, so that a magnetic liquid layer with a speed gradient exists in the second magnetic liquid 7, the second magnetic liquids 7 with different moving speeds are sheared and rubbed with each other, mechanical energy is converted into heat energy, the second magnetic liquids 7 are viscous and consume energy, and the vibration reduction effect is improved.
Due to the existence of the pores in the second porous medium piece 8, on one hand, the solid-liquid contact area is increased, and meanwhile, the velocity gradient in the second magnetic liquid 7 is increased, so that the friction energy consumption and the viscous energy consumption are increased, and the vibration reduction effect is further increased.
Meanwhile, the flow rates of the second magnetic liquids 7 passing through different pores of the second porous medium piece 8 are different, and the second magnetic liquids 7 with different flow rates can be sheared and rubbed with each other when meeting, so that mechanical energy is converted into heat energy, energy can be consumed by viscosity in the second magnetic liquids 7, and the vibration reduction effect is further improved.
In some embodiments, the first lumen 101 includes a first lumen section 1011, a second lumen section 1012, and a third lumen section 1013 arranged in sequence along the first direction. The cross-sectional area of the first cavity section 1011 decreases in a direction away from the second cavity section 1012, and the cross-sectional area of the third cavity section 1013 decreases in a direction away from the second cavity section 1012. Optionally, the diameter of the cross-section of the first cavity section 1011 decreases in a direction away from the second cavity section 1012, and the diameter of the cross-section of the third cavity section 1013 decreases in a direction away from the second cavity section 1012.
Therefore, when the second permanent magnet 6 moves towards the first cavity section 1011, the second magnetic liquid 7 is pressed and deformed while contacting the wall surface of the first cavity section 1011, and at this time, the wall surface of the first cavity section 1011 always makes the connecting member 4 move towards the third cavity section 1013, so that the second magnetic liquid 7 returns to the original shape. Similarly, when the connecting member 4 moves toward the third cavity 1013, the second magnetic liquid 7 is pressed and deformed while contacting the wall of the third cavity 1013, and at this time, the wall of the third cavity 1013 causes the connecting member 4 to move toward the first cavity 1011, so that the second magnetic liquid 7 returns to its original shape. Therefore, the probability that the second permanent magnet 6 is broken is effectively reduced by the first cavity section 1011 and the third cavity section 1013, and the service performance of the magnetic liquid shock absorber is ensured. Furthermore, the first and third cavity sections 1011, 1013 also facilitate the return of the second permanent magnet 6 to the center position of the first interior cavity 101, i.e. to the second cavity section 1012, when the magnetic liquid damper vibrations and accelerations are zero.
It should be noted that, under the normal operation of the magnetic liquid vibration absorber, the single-side amplitude of the second porous medium member 8 is smaller than the left-right dimension of the first and third cavity sections 1011 and 1013, that is, the second porous medium member 8 does not collide with the wall surface of the first internal cavity 101.
In some embodiments, the connecting member 4 is a connecting tube 4a, the connecting tube 4a extends along a first direction, and the connecting tube 4a is sleeved on the first permanent magnet 5. The connecting pipe 4a is a circular pipe, the mounting pipe 2 is a circular pipe, the first porous medium piece 3 is circular, and the first permanent magnet 5 is circular. The axial direction of the installation pipe 2, the axial direction of the first porous medium piece 3 and the axial direction of the first permanent magnet 5 are consistent with the first direction, and the first permanent magnet 5 is sleeved on the installation pipe 2.
At this time, the outer diameter of the first permanent magnet 5 is 1/3-3/5 of the diameter of the second cavity 1012, and the inner diameter of the first permanent magnet 5 is 3/10-1/2 of the diameter of the second cavity 1012. Therefore, the thickness of the first permanent magnet 5 ensures that the first permanent magnet has enough adsorption force on the first magnetic liquid 15 in the installation pipe 2, so as to ensure that the first magnetic liquid 15 has enough friction area with the solid surface, and further ensure the vibration reduction effect of the magnetic liquid vibration reducer.
Furthermore, the outer diameter of the mounting tube 2 is 1/5-2/5 of the diameter of the second chamber section 1012, the inner diameter of the mounting tube 2 is 2/3-9/10 of the outer diameter of the mounting tube 2, and the length of the mounting tube 2 is equal to the dimension of the first lumen 101 in the first direction. From this, the thickness of installation pipe 2 also guarantees that first permanent magnet 5 has sufficient adsorption affinity to first magnetic fluid 15 in installation pipe 2 to guarantee that first magnetic fluid 15 and solid surface have sufficient friction area, guarantee to have sufficient velocity gradient in first magnetic fluid 15 simultaneously, and then guarantee the damping effect of magnetic fluid shock absorber.
In some embodiments, each of the outer and inner edges of the cross-section of the mounting tube 2 is polygonal, the outer circumferential surface of the mounting tube 2 forming a plurality of outer lateral surfaces. The inner edge of the cross section of the connecting pipe 4a is polygonal, and the inner peripheral surface of the connecting pipe 4a forms a plurality of mounting surfaces corresponding to the outer side surfaces one to one. The first permanent magnet 5 comprises a plurality of sheet-shaped permanent magnets, at least one sheet-shaped permanent magnet is mounted on each mounting surface, and each outer side surface is opposite to at least one sheet-shaped permanent magnet.
At this time, the inner edge of the cross section of the connection pipe 4a is a regular polygon, and the sheet-like permanent magnet is a rectangular parallelepiped. The diameter of a circumscribed circle of a regular polygon formed by the inner edge of the cross section of the connecting pipe 4a is 1/3-3/5 of the diameter of the second cavity section 1012, the length of the sheet-shaped permanent magnet is equal to that of the connecting pipe 4a, the width of the sheet-shaped permanent magnet is 1/2-9/10 of the side length of the regular polygon formed by the inner edge of the cross section of the connecting pipe 4a, and the height of the sheet-shaped permanent magnet is 1/30-1/6 of the diameter of the second cavity section 1012. From this, a plurality of slice permanent magnets in a plurality of installation faces set up with separating, avoid two adjacent slice permanent magnets to contact each other and influence magnetism, guarantee to the first magnetic fluid 15 in the installation pipe 2 stable, adsorb evenly.
In some embodiments, the dimension of the first cavity section 1011 in the first direction is equal to the dimension of the third cavity section 1013 in the first direction, and both the first cavity section 1011 and the third cavity section 1013 are frustoconical. Thereby ensuring that the magnetic liquid damper has the same damping effect in the left direction and the right direction. The length of the connecting pipe 4a is greater than the size of the second cavity 1012 in the first direction, as shown in fig. 1, that is, the distance between the left end surface of the second permanent magnet 6 at the leftmost end and the right end surface of the second permanent magnet 6 at the rightmost end is greater than the length of the second cavity 1012 in the left-right direction. This ensures that the first 1011 and third 1013 chamber sections return the connecting element 4 to the central position of the first interior chamber 101.
In some embodiments, the connecting member 4 is a connecting tube 4a, the connecting tube 4a is a circular tube, the second porous medium member 8 is in a circular ring shape, the second permanent magnet 6 is in a circular ring shape, the second porous medium member 8 is sleeved on the second permanent magnet 6, and the second permanent magnet 6 is sleeved on the connecting tube 4 a. At this time, the outer diameter of the second permanent magnet 6 is 2/3-3/4 of the diameter of the second cavity 1012, the inner diameter of the second permanent magnet 6 is 1/2-2/3 of the diameter of the second cavity 1012, and the outer diameter of the second porous medium piece 8 is 5/7-9/10 of the diameter of the second cavity 1012. Wherein, the outer diameter of the second porous medium member 8 is larger than the minimum diameter of the first cavity section 1011, and the outer diameter of the second porous medium member 8 is larger than the minimum diameter of the third cavity section 1013, thereby further preventing the second permanent magnet 6 from being broken by contacting with the left wall surface and the right wall surface of the first inner cavity 101.
Optionally, the number of the second permanent magnets 6 is multiple, the multiple second permanent magnets 6 are arranged at intervals in the first direction, the number of the second porous medium pieces 8 is multiple, and the multiple second porous medium pieces 8 are arranged on the multiple second permanent magnets 6 in a one-to-one correspondence manner. Therefore, the second magnetic liquid 7 can be filled in the pores on the left side and the right side in each second porous medium piece 8, so that the contact area between the second magnetic liquid 7 and the solid surface is further increased, the velocity gradient in the first magnetic liquid 15 is further increased, and the vibration reduction effect of the magnetic liquid vibration absorber is further improved.
Specifically, there are two second permanent magnets 6, and both the two second permanent magnets 6 are axially magnetized, and the axes of the two second permanent magnets 6 are substantially coincident. The connecting pipe 4a sequentially comprises a first pipe section, a second pipe section and a third pipe section from left to right, the outer diameters of the first pipe section and the third pipe section are the same, and the outer diameters of the first pipe section and the third pipe section are smaller than the outer diameter of the second pipe section. The second permanent magnet 6 on the left side is sleeved on the first pipe section, the left end face of the second permanent magnet 6 is overlapped with the left end face of the first pipe section, the second permanent magnet 6 on the right side is sleeved on the third pipe section, and the right end face of the second permanent magnet is overlapped with the right end face of the third pipe section.
In some embodiments, the first porous medium member 3 is made of at least one of sponge, carbon foam, and copper foam, and the second porous medium member 8 is made of at least one of sponge, carbon foam, and copper foam.
Therefore, when the magnetic liquid damper vibrates, the first porous medium piece 3 and the second porous medium piece 8 both have elasticity, so that the relative movement between the first magnetic liquid 15 in the pore and the first porous medium piece 3 is realized, and the relative movement between the second magnetic liquid 7 in the pore and the second porous medium piece 8 is also realized, so that the energy consumed due to viscosity is increased, and the damping effect of the magnetic liquid damper is improved.
Specifically, the pores of the first porous dielectric member 3 and the second porous dielectric member 8 are both in the micro-scale or nano-scale, and the first porous dielectric member 3 and the second porous dielectric member 8 are both made of the same material, such as at least one of sponge, carbon foam, and copper foam.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (18)
1. A magnetic liquid shock absorber, comprising:
a housing;
the end cover is connected with the shell, and a first inner cavity is defined between the end cover and the shell;
the first porous medium piece is arranged in the first inner cavity, and pores of the first porous medium piece are filled with first magnetic liquid; and
the first permanent magnet is movably arranged in the first inner cavity and can be matched with the first magnetic liquid so as to drive the first magnetic liquid to move relative to the first porous medium piece;
the magnetic liquid separation device further comprises an installation pipe, wherein the installation pipe is arranged in the first inner cavity and extends along a first direction, the first porous medium piece is arranged in the installation pipe, and the first magnetic liquid is arranged in the installation pipe.
2. The magnetic liquid damper according to claim 1,
the mounting pipe is a circular pipe, the first permanent magnet is annular, the first porous medium piece is annular, the axial direction of the mounting pipe, the axial direction of the first porous medium piece and the axial direction of the first permanent magnet are consistent with the first direction, and the first permanent magnet is sleeved on the mounting pipe;
or each of the outer edge and the inner edge of the cross section of the installation pipe is polygonal, the outer peripheral surface of the installation pipe forms a plurality of outer side surfaces, the first permanent magnet comprises a plurality of sheet-shaped permanent magnets, and each outer side surface is opposite to at least one sheet-shaped permanent magnet.
3. The magnetic liquid damper according to claim 1, wherein the first inner chamber has a first sidewall surface and a second sidewall surface opposite in the first direction, the first sidewall surface being provided with a first protrusion, the second sidewall surface being provided with a second protrusion, wherein the mounting tube has a first end and a second end opposite in the first direction, the first protrusion extending into the first end, the second protrusion extending into the second end.
4. The magnetic liquid damper of claim 3, wherein the dimension of the first protrusion in the first direction is 1/30-1/15 of the dimension of the first internal cavity in the first direction, and the dimension of the second protrusion in the first direction is 1/30-1/15 of the dimension of the first internal cavity in the first direction.
5. The magnetic liquid damper according to any one of claims 1 to 4, characterized by further comprising:
a connecting member;
the second permanent magnet is connected with the first permanent magnet through the connecting piece;
the second magnetic liquid is arranged in the first inner cavity, the second magnetic liquid is adsorbed on the second permanent magnet, and the second magnetic liquid is in contact with the wall surface of the first inner cavity; and
a second porous medium member provided on at least one of the second permanent magnet and the connecting member, a part of the second magnetic liquid being filled in pores in the second porous medium member.
6. The magnetic liquid damper of claim 5, wherein the first inner cavity comprises a first cavity section, a second cavity section and a third cavity section arranged in sequence along the first direction, the cross-sectional area of the first cavity section decreases along a direction away from the second cavity section, and the cross-sectional area of the third cavity section decreases along a direction away from the second cavity section.
7. The magnetic liquid damper of claim 6, wherein the diameter of the cross-section of the first cavity section decreases in a direction away from the second cavity section and the diameter of the cross-section of the third cavity section decreases in a direction away from the second cavity section.
8. The magnetic liquid damper as claimed in claim 6, wherein the connecting member is a connecting tube extending in the first direction, the connecting tube being fitted over the first permanent magnet, wherein
The connecting pipe is a circular pipe, the mounting pipe is a circular pipe, the first porous medium piece is in a circular ring shape, the first permanent magnet is in a circular ring shape, the axial direction of the mounting pipe, the axial direction of the first porous medium piece and the axial direction of the first permanent magnet are consistent with the first direction, and the first permanent magnet is sleeved on the mounting pipe.
9. The magnetic liquid damper of claim 8, wherein the outer diameter of the first permanent magnet is 1/3-3/5 of the diameter of the second cavity section and the inner diameter of the first permanent magnet is 3/10-1/2 of the diameter of the second cavity section.
10. The magnetic liquid damper of claim 8, wherein the outer diameter of the mounting tube is 1/5-2/5 of the diameter of the second cavity section, the inner diameter of the mounting tube is 2/3-9/10 of the outer diameter of the mounting tube, and the length of the mounting tube is equal to the dimension of the first inner cavity in the first direction.
11. The magnetic liquid damper according to claim 6, wherein the connecting member is a connecting pipe extending in the first direction, the connecting pipe is fitted over the first permanent magnet, each of an outer edge and an inner edge of a cross section of the mounting pipe is polygonal, an outer peripheral surface of the mounting pipe forms a plurality of outer side surfaces, an inner edge of a cross section of the connecting pipe is polygonal, and an inner peripheral surface of the connecting pipe forms a plurality of mounting surfaces corresponding to the plurality of outer side surfaces one to one, wherein the first permanent magnet includes a plurality of sheet-shaped permanent magnets, at least one sheet-shaped permanent magnet is mounted on each of the mounting surfaces, and each of the outer side surfaces is opposite to at least one sheet-shaped permanent magnet.
12. The magnetic liquid damper as claimed in claim 11, wherein the inner edge of the cross section of the connection pipe is a regular polygon, the sheet-shaped permanent magnet is rectangular parallelepiped, the diameter of a circumscribed circle of the regular polygon formed by the inner edge of the cross section of the connection pipe is 1/3-3/5 of the diameter of the second cavity section, the length of the sheet-shaped permanent magnet is equal to the length of the connection pipe, the width of the sheet-shaped permanent magnet is 1/2-9/10 of the side length of the regular polygon formed by the inner edge of the cross section of the connection pipe, and the height of the sheet-shaped permanent magnet is 1/30-1/6 of the diameter of the second cavity section.
13. The magnetic liquid damper of claim 6, wherein a dimension of the first cavity segment in the first direction is equal to a dimension of the third cavity segment in the first direction.
14. The magnetic liquid shock absorber of claim 13, wherein the first and third cavity sections are each frustoconical.
15. The magnetic liquid damper according to claim 6, wherein the connecting member is a connecting pipe, the connecting pipe is a circular pipe, the second porous medium member is circular ring-shaped, the second permanent magnet is circular ring-shaped, the second porous medium member is sleeved on the second permanent magnet, and the second permanent magnet is sleeved on the connecting pipe.
16. The magnetic liquid damper of claim 15, wherein the outer diameter of the second permanent magnet is 2/3-3/4 of the diameter of the second cavity section, the inner diameter of the second permanent magnet is 1/2-2/3 of the diameter of the second cavity section, the outer diameter of the second piece of porous media is 5/7-9/10 of the diameter of the second cavity section, the outer diameter of the second piece of porous media is larger than the smallest diameter of the first cavity section, and the outer diameter of the second piece of porous media is larger than the smallest diameter of the third cavity section.
17. The magnetic liquid damper according to claim 15, wherein the second permanent magnet is plural, plural second permanent magnets are provided at intervals in the first direction, plural second porous medium members are provided, and plural second porous medium members are provided on the plural second permanent magnets in one-to-one correspondence.
18. The magnetic liquid damper according to claim 5, wherein the first porous medium member is made of at least one of sponge, carbon foam, and copper foam, and the second porous medium member is made of at least one of sponge, carbon foam, and copper foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254829.6A CN112392888B (en) | 2020-11-11 | 2020-11-11 | Magnetic liquid vibration damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254829.6A CN112392888B (en) | 2020-11-11 | 2020-11-11 | Magnetic liquid vibration damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112392888A CN112392888A (en) | 2021-02-23 |
| CN112392888B true CN112392888B (en) | 2021-06-08 |
Family
ID=74600212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011254829.6A Active CN112392888B (en) | 2020-11-11 | 2020-11-11 | Magnetic liquid vibration damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112392888B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999022162A1 (en) * | 1997-10-29 | 1999-05-06 | Lord Corporation | Controllable medium device and apparatus utilizing same |
| CN2715274Y (en) * | 2004-05-26 | 2005-08-03 | 北京交通大学 | Magnetic liquid upward movement device |
| UA12327U (en) * | 2004-08-30 | 2006-02-15 | Oleh Viacheslavovyc Buchatskyi | Controlled magnetorheological damper with additional damping |
| CN102032304A (en) * | 2010-12-29 | 2011-04-27 | 北京交通大学 | Magnetic fluid damping device |
| CN102644691A (en) * | 2012-05-21 | 2012-08-22 | 上海应用技术学院 | Double-access foam metal magneto-rheological fluid damper |
| CN103758911A (en) * | 2014-01-27 | 2014-04-30 | 安徽柳工起重机有限公司 | Vehicle magneto-rheological oil gas suspension damping valve |
| CN104074903A (en) * | 2014-06-30 | 2014-10-01 | 北京交通大学 | Magnetic liquid damping shock absorber with arc-shaped inner wall axial section |
| CN104455140A (en) * | 2014-11-14 | 2015-03-25 | 孙欣 | Damper for vehicle suspension |
| CN104613121A (en) * | 2015-01-26 | 2015-05-13 | 北京交通大学 | Outer taper angle magnetic liquid damping absorber |
| CN108331877A (en) * | 2018-01-22 | 2018-07-27 | 哈尔滨工程大学 | Shear-type magnetorheological fluid damper based on quadrupole magnetic core Yu foam metal liner |
-
2020
- 2020-11-11 CN CN202011254829.6A patent/CN112392888B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999022162A1 (en) * | 1997-10-29 | 1999-05-06 | Lord Corporation | Controllable medium device and apparatus utilizing same |
| CN2715274Y (en) * | 2004-05-26 | 2005-08-03 | 北京交通大学 | Magnetic liquid upward movement device |
| UA12327U (en) * | 2004-08-30 | 2006-02-15 | Oleh Viacheslavovyc Buchatskyi | Controlled magnetorheological damper with additional damping |
| CN102032304A (en) * | 2010-12-29 | 2011-04-27 | 北京交通大学 | Magnetic fluid damping device |
| CN102644691A (en) * | 2012-05-21 | 2012-08-22 | 上海应用技术学院 | Double-access foam metal magneto-rheological fluid damper |
| CN103758911A (en) * | 2014-01-27 | 2014-04-30 | 安徽柳工起重机有限公司 | Vehicle magneto-rheological oil gas suspension damping valve |
| CN104074903A (en) * | 2014-06-30 | 2014-10-01 | 北京交通大学 | Magnetic liquid damping shock absorber with arc-shaped inner wall axial section |
| CN104455140A (en) * | 2014-11-14 | 2015-03-25 | 孙欣 | Damper for vehicle suspension |
| CN104613121A (en) * | 2015-01-26 | 2015-05-13 | 北京交通大学 | Outer taper angle magnetic liquid damping absorber |
| CN108331877A (en) * | 2018-01-22 | 2018-07-27 | 哈尔滨工程大学 | Shear-type magnetorheological fluid damper based on quadrupole magnetic core Yu foam metal liner |
Non-Patent Citations (3)
| Title |
|---|
| 基于BP神经网络的多孔介质减振器隔振效果分析;杨文荣等;《磁性材料及器件》;20160131;第47卷(第01期);第44-48页 * |
| 基于MATLAB的磁流体-泡沫金属减振器的仿真研究;徐平等;《机械设计》;20081020;第25卷(第10期);第38-40页 * |
| 磁性液体阻尼减振实验台的设计和实验分析;冯振华等;《振动.测试与诊断》;20130215;第33卷(第01期);第106-110,169页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112392888A (en) | 2021-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112196927B (en) | Magnetic liquid damping shock absorber based on first-order and second-order buoyancy principle | |
| CN101836844A (en) | Vacuum cleaner | |
| CN112196925B (en) | Magnetic liquid damping vibration absorber | |
| CN104074903A (en) | Magnetic liquid damping shock absorber with arc-shaped inner wall axial section | |
| CN104847826B (en) | Cone angle magnetic fluid damper in a kind of | |
| CN112112921B (en) | Magnetic liquid damping vibration absorber | |
| CN214578511U (en) | Magnetic liquid vibration damper | |
| CN112196926B (en) | Magnetic liquid damping vibration absorber | |
| CN112392888B (en) | Magnetic liquid vibration damper | |
| CN112392887B (en) | Magnetic liquid vibration damper | |
| CN112727973B (en) | Magnetic liquid vibration damper | |
| CN112211940B (en) | Magnetic liquid vibration damper | |
| CN214007866U (en) | Magnetic liquid shock absorber based on second-order buoyancy principle | |
| CN112392884B (en) | Magnetic liquid shock absorber based on second-order buoyancy principle | |
| CN214007868U (en) | Magnetic liquid vibration damper | |
| CN214221873U (en) | Magnetic liquid damping vibration absorber | |
| CN112392891B (en) | Magnetic liquid vibration damper | |
| CN112392886B (en) | Magnetic liquid vibration damper | |
| CN112392885B (en) | Magnetic liquid vibration damper | |
| CN112392889B (en) | Magnetic liquid shock absorber based on first-order buoyancy principle | |
| CN112392890B (en) | Magnetic liquid vibration damper | |
| CN214146389U (en) | Magnetic liquid vibration damper | |
| CN214007867U (en) | Magnetic liquid vibration damper | |
| CN214007879U (en) | Magnetic liquid damping shock absorber based on first-order and second-order buoyancy principle | |
| CN213981781U (en) | Magnetic liquid vibration damper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |