CN112392885A - Magnetic liquid vibration damper - Google Patents

Magnetic liquid vibration damper Download PDF

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Publication number
CN112392885A
CN112392885A CN202011254781.9A CN202011254781A CN112392885A CN 112392885 A CN112392885 A CN 112392885A CN 202011254781 A CN202011254781 A CN 202011254781A CN 112392885 A CN112392885 A CN 112392885A
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China
Prior art keywords
magnetic liquid
pipe
sliding rod
pipe section
pipeline
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Granted
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CN202011254781.9A
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CN112392885B (en
Inventor
李德才
李倩
孙睿
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Tsinghua University
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Tsinghua University
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Publication of CN112392885A publication Critical patent/CN112392885A/en
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses a magnetic liquid vibration damper, comprising: a housing defining a cavity; the mass block comprises a first sliding rod connected with the mass block; a first porous media piece disposed within the first conduit; a first magnetic liquid filled in the first pipe, the first magnetic liquid being located between the first porous medium member and the first slide rod in an extending direction of the first pipe, the at least a portion of the first pipe extending in a first direction; and a first gas filled within the first pipe, the first gas being located between the first magnetic liquid and the second end of the first pipe. Therefore, the magnetic liquid damper provided by the embodiment of the invention has the advantages of capability of being used in space, good damping effect, stable damping effect and the like.

Description

Magnetic liquid vibration damper
Technical Field
The invention relates to the 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.
In the related art, the existing magnetic liquid damper mainly uses a second-order buoyancy principle damper, mainly takes the form that the damping mass block is a permanent magnet, and fluid shear is generated through the relative motion of the permanent magnet and the magnetic liquid, so as to achieve the effects of viscous energy consumption, as in document 1 (patent application of publication No. CN 104074903A) and document 2 (patent application of publication No. CN 102032304A), most of the existing magnetic liquid second-order buoyancy principle dampers have the following disadvantages: 1. the permanent magnet material is relatively fragile, and the permanent magnet is likely to be collided in the process of extremely high acceleration, so that the permanent magnet is broken; 2. the friction surface which plays a role of vibration reduction is less, the vibration reduction effect is poorer, and the like; 3. some magnetic liquid vibration dampers cannot be reset in space, so that the magnetic liquid vibration dampers cannot be used in space.
Therefore, the magnetic liquid damper needs to be redesigned to solve the above problems, so that the magnetic liquid damper has practical engineering value.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention propose a magnetic liquid damper.
According to an embodiment of the present invention, a magnetic liquid damper includes:
a housing defining a cavity;
a first conduit, at least a portion of the first conduit being disposed within the cavity;
the mass block comprises a connected first sliding rod, the first sliding rod is movably arranged in the first pipeline along the extension direction of at least one part of the first pipeline, one part of the first sliding rod extends out of the first pipeline from the first end of the first pipeline, and the second end of the first pipeline is closed;
a first porous media piece disposed within the first conduit;
a first magnetic liquid filled in the first pipe, the first magnetic liquid being located between the first porous medium member and the first slide rod in an extending direction of the first pipe, the at least a portion of the first pipe extending in a first direction; and
a first gas filled within the first tube, the first gas being between the first magnetic liquid and the second end of the first tube.
Therefore, the magnetic liquid damper provided by the embodiment of the invention has the advantages of capability of being used in space, good damping effect, stable damping effect and the like.
In some embodiments, the first pipeline includes a first pipe section, a second pipe section and a third pipe section which are connected in sequence, one end of the first pipe section forms the first end portion of the first pipeline, the first pipe section extends along the first direction, one end of the third pipe section forms the second end portion of the first pipeline, at least a portion of the first magnetic liquid is disposed at a joint of the first pipe section and the second pipe section, the first porous medium member is disposed in the second pipe section, the first porous medium member is adjacent to the first pipe section, the first gas is disposed in the second pipe section and the third pipe section, the first sliding rod is movably disposed in the first pipe section along the first direction, and the portion of the first sliding rod extends out of the first pipe section.
The magnetic liquid vibration absorber according to the embodiment of the present invention further includes:
the mass block further comprises a second sliding rod, the first sliding rod is movably arranged in the first pipeline along the preset direction, the second sliding rod is movably arranged in the second pipeline along the preset direction, a part of the second sliding rod extends out of the second pipeline from the first end of the second pipeline, and the second end of the second pipeline is closed;
a second porous media piece disposed within the second conduit;
a second magnetic liquid filled in the second pipe, the second magnetic liquid being located between the second porous medium member and the second slide rod in an extending direction of the second pipe, the at least a portion of the second pipe extending in the first direction; and
a second gas filled within the second pipe, the second gas being located between the second magnetic liquid and the second end of the second pipe.
In some embodiments, the second pipeline includes a fourth pipe section, a fifth pipe section and a sixth pipe section which are connected in sequence, one end of the fourth pipe section forms the first end portion of the second pipeline, the fourth pipe section extends along the first direction, one end of the sixth pipe section forms the second end portion of the second pipeline, at least a portion of the second magnetic liquid is disposed at a junction of the fourth pipe section and the fifth pipe section, the second porous medium member is disposed in the fifth pipe section, the second porous medium member is adjacent to the fourth pipe section, the second gas is disposed in the fifth pipe section and the sixth pipe section, the second sliding rod is movably disposed in the fourth pipe section along the first direction, and the portion of the second sliding rod extends out of the fourth pipe section.
The magnetic liquid vibration absorber according to the embodiment of the present invention further includes:
the first permanent magnet is arranged on the first sliding rod and is positioned between the first sliding rod and the first magnetic liquid in the extending direction of the first pipeline; and
and the second permanent magnet is arranged on the second sliding rod and is positioned between the second sliding rod and the second magnetic liquid in the extending direction of the second pipeline.
In some embodiments, the third tube segment and the sixth tube segment are located outside of the housing.
In some embodiments, the mass block further includes a third permanent magnet, the portion of the first sliding rod is connected to the third permanent magnet, and the portion of the second sliding rod is connected to the third permanent magnet, wherein a third magnetic liquid is adsorbed on the third permanent magnet, and the third magnetic liquid is in contact with the wall surface of the cavity.
In some embodiments, a porous medium ring is disposed on a circumferential surface of the third permanent magnet, and pores of the porous medium ring are filled with the third magnetic liquid.
In some embodiments, a vent is provided on the housing.
In some embodiments, a first sealing ring is disposed between the first pipe and the first sliding rod, and a second sealing ring is disposed between the second pipe and the second sliding rod.
Drawings
Fig. 1 is a schematic structural view of a magnetic liquid vibration damper according to an embodiment of the present invention.
Reference numerals:
a housing 100, a first housing 101, a second housing 102, a cavity 110;
a first pipeline 200, a first end 201 of the first pipeline 200, a second end 202 of the first pipeline 200, a first pipe segment 210, a second pipe segment 220, a third pipe segment 230;
a second pipeline 300, a first end 301 of the second pipeline 300, a second end 302 of the second pipeline 300, a fourth pipe segment 310, a fifth pipe segment 320, a sixth pipe segment 330;
a mass 400, a first sliding rod 410, a second sliding rod 420, a third permanent magnet 430, a porous medium ring 440;
a first piece of porous media 510, a second piece of porous media 520, a first gas 530, a second gas 540,
a first magnetic liquid 610, a second magnetic liquid 620, a third magnetic liquid 630;
the permanent magnet assembly comprises a first permanent magnet 810, a second permanent magnet 820, a vent 830, a first sealing ring 840 and a second sealing ring 850.
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 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings, and as shown in fig. 1, the magnetic liquid vibration damper 1000 according to an embodiment of the present invention includes a housing 100, a first tube 200, a mass block 400, a first porous medium member 510, a first magnetic liquid 610, and a first gas 530.
The housing 100 defines a cavity 110; at least a portion of the first conduit 200 is disposed within the cavity 110.
The mass 400 comprises a connected first sliding rod 410, the first sliding rod 410 is movably arranged in the first conduit 200 along an extension direction of at least a portion of the first conduit 200, a portion of the first sliding rod 410 extends out of the first conduit 200 from the first end 201 of the first conduit 200, and the second end 202 of the first conduit 200 is closed. A first piece of porous media 510 is disposed within the first conduit 200.
The first magnetic liquid 610 is filled in the first pipe 200, the first magnetic liquid 610 is located between the first porous medium member 510 and the first sliding rod 410 in the extending direction of the first pipe 200, and at least a part of the first pipe 200 extends in the first direction. The first gas 530 is filled in the first pipe 200, and the first gas 530 is located between the first magnetic liquid 610 and the second end 202 of the first pipe 200.
Magnetic liquid damper 1000 according to the embodiment of the present invention is configured by providing first sliding rod 410, and first sliding rod 410 is movably provided in first pipe 200 along the extending direction of at least a part of first pipe 200. Thus, the first sliding bar 410 is movable within at least a portion of the first conduit 200 under the influence of the vibrating mechanical energy.
The operation of the magnetic fluid vibration absorber 1000 will be briefly described below by taking as an example the case where the mass 500 moves toward the direction adjacent to the first magnetic fluid 610 under the influence of the vibrating mechanical energy.
The first magnetic liquid 610 is located between the first porous medium member 510 and the first sliding rod 410 in the extending direction of the first pipe 200. So that when the first sliding rod 410 contacts the first magnetic liquid 610 during the movement of the first sliding rod 410 towards the first magnetic liquid 610, the first sliding rod 410 can push the first magnetic liquid 610 to flow into the first porous medium member 510, so that the first magnetic liquid 610 moves in the pores of the first porous medium member 510. Thereby allowing friction of first magnetic liquid 610 with first porous medium piece 510. Therefore, the solid-liquid contact area is increased, more mechanical energy can be converted into frictional heat energy, and the vibration reduction effect is improved.
Meanwhile, the first magnetic liquid 610 passing through different pores of the first porous medium piece 510 has different flow rates, and the first magnetic liquid 610 with different flow rates can be sheared and rubbed when meeting, so that mechanical energy is converted into heat energy, energy can be consumed by viscosity inside the first magnetic liquid 610, the vibration reduction effect is further increased, part of the first magnetic liquid 610 can be filled in the pores of the first porous medium piece 510, the volatilization of the first magnetic liquid 610 can be reduced, and the vibration reduction effect of the magnetic liquid vibration reducer is more stable.
As the first magnetic liquid 610 moves within the pores of the first piece of porous media 510, the first magnetic liquid 610 pushes the first gas 530 towards the second end 202 of the first tube 200. The second end 202 of the first tube 200 is closed, and thus, the first magnetic liquid 610 pushes the first gas 530 towards the second end 202 of the first tube 200, and the first magnetic liquid 610 causes the volume of the first gas 530 to be compressed. The pipe diameter of the first pipe 200 is not changed (the contact area between the first magnetic liquid 610 and the first gas 530 is not changed), the pressure of the first gas 530 on the first magnetic liquid 610 is increased, that is, the acting force of the first gas 530 on the first magnetic liquid 610 is increased.
Thereby increasing the force of first magnetic fluid 610 on first slide bar 410 (i.e., increasing the first restoring force of first magnetic fluid 610 on first slide bar 410).
When the first slide lever 410 undergoes a motion process of acceleration followed by deceleration and then the speed of the first slide lever is 0, the first slide lever 410 moves to the first limit position.
When the mass 400 moves to the first extreme position, for example, when the mass 400 moves to the left to the first extreme position, the first magnetic liquid 610 is reset under the force of the first gas 760 on it, and the first magnetic liquid 610 pushes the mass 400 to move to its equilibrium position, for example, the mass 400 moves to the right. The equilibrium position of the mass 400 is: when the mass 400 is in a position where no damping motion occurs, the mass 400 is stationary relative to the housing 100.
The magnetic liquid vibration absorber 1000 according to the embodiment of the present invention can be used in space by closing the second end 202 of the first tube 200 and filling the first gas 530 in the first tube 200 so that the restoring force is provided by the pressure of the first gas 760 when the mass 400 is shifted from the equilibrium position, the restoring force provided by the pressure of the first gas 760 being not affected by gravity.
Therefore, the magnetic liquid damper 1000 according to the embodiment of the invention has the advantages of being capable of being used in space, good in damping effect, stable in damping effect and the like.
The magnetic liquid vibration absorber 1000 according to the embodiment of the present invention includes a housing 100, a first tube 200, a mass 400, a first porous medium member 510, a first magnetic liquid 610, a first gas 530, and a first permanent magnet 810.
The housing 100 includes a first housing 101 and a second housing 102 disposed opposite each other, the first housing 101 and the second housing 102 defining a cavity 110.
At least a portion of the first conduit 200 is disposed within the cavity 110. The first pipeline 200 includes a first pipe segment 210, a second pipe segment 220, and a third pipe segment 230 connected in series. One end of the first pipe segment 210 constitutes a first end portion 201 of the first pipe 200 and one end of the third pipe segment 230 constitutes a second end portion 202 of the first pipe 200. At least a portion of the first conduit 200 extends in a first direction. Specifically, the first pipe section 210 extends in a first direction, for example, the first pipe section 210 extends in a left-right direction. The first direction may be a left-right direction as indicated by arrow a in fig. 1. In order to make the technical solution of the present application more easily understood, the following further describes the technical solution of the present application by taking the example that the first pipe section 210 extends rightward from the second pipe section 220.
The mass 400 comprises a connected first sliding rod 410, the first sliding rod 410 being movably arranged within the first conduit 200 in the extension direction of at least a part of the first conduit 200. Specifically, the first slide lever 410 is movably provided in the first pipe section 210 in the left-right direction. A portion of the first slide bar 410 extends out of the first conduit 200 from the first end 201 of the first conduit 200. Specifically, a portion of the first sliding bar 410 protrudes rightward from the first pipe section 210.
A first piece of porous media 510 is disposed within the first conduit 200. Specifically, a first piece of porous media 510 is disposed within the second tube segment 220, with the first piece of porous media 510 adjacent the first tube segment 210.
The first magnetic fluid 610 is filled in the first pipeline 200, and at least a part of the first magnetic fluid 610 is disposed at the joint of the first pipe segment 210 and the second pipe segment 220, i.e., at least a part of the first magnetic fluid 610 is disposed at the corner of the first pipe segment 210 and the second pipe segment 220.
The first permanent magnet 810 is provided on the first sliding bar 410, and the first permanent magnet 810 is located between the first sliding bar 410 and the first magnetic liquid 610 in the extending direction of the first pipe 200. The first permanent magnet 810 adsorbs the first magnetic liquid 610, and the first permanent magnet 810 causes the first magnetic liquid 610 to move as the first sliding bar 410 moves.
The first magnetic liquid 610 is located between the first porous medium member 510 and the first sliding rod 410 in the extending direction of the first pipe 200, that is, both ends of the first magnetic liquid 610 do not exceed the first porous medium member 510 and the first sliding rod 410 in the extending direction of the first pipe 200. For example, a part of the first magnetic liquid 610 may be filled in the pores of the first porous medium member 510, so that volatilization of the first magnetic liquid 610 may be reduced, the vibration damping effect of the magnetic liquid vibration damper may be more stable, and the contact area between the first magnetic liquid 610 and the first porous medium member 510 may be increased, thereby further increasing the vibration damping effect.
The first gas 530 is filled in the first pipe 200, and particularly, the first gas 530 is provided in the second pipe segment 220 and the third pipe segment 230. The first gas 530 is located between the first magnetic liquid 610 and the second end 202 of the first conduit 200. The second end 202 of the first pipe 200 is closed, so there is an interaction force between the first gas 530 and the first magnetic liquid 610.
Therefore, when the mass 400 moves toward the first magnetic liquid 610 under the influence of the vibrating mechanical energy, the first sliding rod 410 moves toward the first magnetic liquid 610 (e.g., the first sliding rod 410 moves to the left) and pushes the first magnetic liquid 610 toward the first porous medium member 510, so that the first magnetic liquid 610 moves within the pores of the first porous medium member 510. Thereby allowing the first magnetic liquid 610 to rub against the first porous medium member 510. The solid-liquid contact area is increased, so that more mechanical energy can be converted into frictional heat energy, and the vibration reduction effect is improved.
Meanwhile, the first magnetic liquids 610 passing through different pores of the first porous medium member 510 have different flow rates, and the first magnetic liquids 610 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 610, and the vibration reduction effect is further increased.
Moreover, after the first magnetic liquid 610 enters the first pipe section 210 under the pushing of the first sliding rod 410, the first magnetic liquid 610 moves to the first gas 530 under the pushing of the first sliding rod 410, that is, the first magnetic liquid 610 located in the first pipe section 210 moves to the first gas 530 under the pushing of the first sliding rod 410. The first magnetic liquid 610 causes the gas volume of the first gas 530 to be compressed. The pipe diameter of the first pipe 200 is not changed (the contact area between the first magnetic liquid 610 and the first gas 530 is not changed), the pressure of the first gas 530 on the first magnetic liquid 610 is increased, that is, the acting force of the first gas 530 on the first magnetic liquid 610 is increased.
Thereby increasing the force of first magnetic fluid 610 on first slide bar 410 (i.e., increasing the first restoring force of first magnetic fluid 610 on first slide bar 410).
When the mass 400 moves to its equilibrium position, e.g., the mass 400 moves to the right, after the mass 400 moves to the first extreme position (at which time the first magnetic liquid 610 in the second tube segment 220 moves to the position farthest from the first tube segment 210), e.g., after the mass 400 moves to the left to the first extreme position. The first magnetic liquid 610 moves toward the first sliding rod 410 by the first gas 530, and the first magnetic liquid 610 pushes the first sliding rod 410 to move in the opposite direction (for example, the first magnetic liquid 610 pushes the first sliding rod 410 to move rightward). The equilibrium position of the mass 400 is: when the mass 400 is in a position where no damping motion occurs, the mass 400 is stationary relative to the housing 100.
After the mass 400 moves to the second limit position, for example, after the mass 400 moves to the right to the second limit position, the mass 400 receives a restoring force to move leftward again, thereby repeating the above process, which will not be described in detail herein. It will be appreciated by those skilled in the art that the mass 400 may be moved first (to the left) towards the first extreme position and first (to the right) towards the second extreme position when moved under the influence of the vibrating mechanical energy.
As shown in fig. 1, magnetic liquid shock absorber 1000 in accordance with an embodiment of the present invention further includes second tube 300, second porous medium piece 520, second magnetic liquid 620, second gas 540 and second permanent magnet 820.
At least a portion of the second pipeline 300 is disposed in the cavity 110, and the second pipeline 300 includes a fourth pipe segment 310, a fifth pipe segment 320, and a sixth pipe segment 330, which are connected in sequence. One end of fourth pipe segment 310 forms a first end 301 of second pipe 300 and one end of sixth pipe segment 330 forms a second end 302 of second pipe 300. At least a portion of the second duct 300 extends in a first direction. Specifically, the fourth pipe section 310 extends in a first direction, for example, the fourth pipe section 310 extends in a left-right direction. In order to make the technical solution of the present application more easily understood, the following further describes the technical solution of the present application by taking the example that the fourth pipe section 310 extends leftwards from the fifth pipe section 320.
The mass 400 further comprises a second sliding rod 420, the first sliding rod 410 is movably disposed in the first conduit 200 along a predetermined direction, the second sliding rod 420 is movably disposed in the second conduit 300 along a predetermined direction, for example, the second sliding rod 420 is movably disposed in the fourth conduit section 310 along a left-right direction. A portion of second slide bar 420 extends out of second conduit 300 from first end 301 of second conduit 300, e.g., a portion of second slide bar 420 extends leftward in a left-right direction out of fourth tube segment 310. Thus, as mass 400 moves left and right, second slide bar 420 moves in a left and right direction within fourth tube segment 310 of second tube 300.
A second porous media 520 is disposed within the second tube 300. Specifically, the second piece of porous media 520 is disposed within the fifth tube segment 320, with the second piece of porous media 520 adjacent the fourth tube segment 310.
The second permanent magnet 820 is provided on the second sliding bar 420, and the second permanent magnet 820 is located between the second sliding bar 420 and the second magnetic liquid 620 in the extending direction of the second pipe 300. The second permanent magnet 820 adsorbs the second magnetic liquid 620, and the second permanent magnet 820 causes the second magnetic liquid 620 to move as the second sliding bar 420 moves.
The second magnetic liquid 620 is filled in the second pipeline 300, and at least a part of the second magnetic liquid 620 is disposed at the joint of the fourth pipe section 310 and the fifth pipe section 320, that is, at least a part of the second magnetic liquid 620 is disposed at the corner of the fourth pipe section 310 and the fifth pipe section 320. The second magnetic liquid 620 is located between the second porous medium member 520 and the second sliding rod 420 in the extending direction of the second pipe 300, that is, both ends of the second magnetic liquid 620 do not exceed the second porous medium member 520 and the second sliding rod 420 in the extending direction of the first pipe 200. For example, a part of the second magnetic liquid 620 may be filled in the pores of the second porous medium member 520, so that the volatilization of the second magnetic liquid 620 may be reduced, and the damping effect of the magnetic liquid damper may be more stable.
The second gas 540 is filled in the second pipe 300, and particularly, the second gas 540 is provided in the fifth pipe segment 320 and the sixth pipe segment 330. Second gas 540 is located between second magnetic liquid 620 and second end 302 of second tube 300. Second end 302 of second tube 300 is closed, and thus, second gas 540 and second magnetic liquid 620 have interacting forces.
Therefore, when the mass 400 moves toward the second magnetic liquid 620 under the influence of the vibrating mechanical energy, the second sliding rod 420 moves toward the second magnetic liquid 620 (e.g., the second sliding rod 420 moves rightward) and pushes the second magnetic liquid 620 toward the second porous medium member 520, so that the second magnetic liquid 620 moves in the pores of the second porous medium member 520. Thereby allowing friction of the second magnetic liquid 620 with the second porous medium member 520. The solid-liquid contact area is increased, so that more mechanical energy can be converted into frictional heat energy, and the vibration reduction effect is improved.
Meanwhile, the flow rates of the second magnetic liquids 620 passing through different pores of the second porous medium member 520 are different, and the second magnetic liquids 620 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 620, and the vibration reduction effect is further improved.
Moreover, after the second magnetic liquid 620 enters the fourth pipe segment 310 under the pushing of the second sliding rod 420, the second magnetic liquid 620 moves to the second gas 540 under the pushing of the second sliding rod 420, that is, the second magnetic liquid 620 located in the fourth pipe segment 310 moves to the second gas 540 under the pushing of the second sliding rod 420. The second magnetic liquid 620 causes the gas volume of the second gas 540 to be compressed. The pipe diameter of second pipe 300 is not changed (the contact area between second magnetic liquid 620 and second gas 540 is not changed), and the pressure of second gas 540 on second magnetic liquid 620 is increased, that is, the force of second gas 540 on second magnetic liquid 620 is increased.
Thereby causing the acting force of the second magnetic liquid 620 on the second slide lever 420 to increase (i.e., the second restoring force of the second magnetic liquid 620 on the second slide lever 420 to increase).
When the mass 400 moves to its equilibrium position, for example, the mass 400 moves to the left after the mass 400 moves to the second limit position (at which time the second magnetic liquid 620 in the fourth pipe section 310 moves to the position farthest from the fourth pipe section 310), for example, after the mass 400 moves to the right to the second limit position. The second magnetic liquid 620 moves toward the second sliding rod 420 under the action of the second gas 540, and a larger pressure is generated between the second gas 540 and the second magnetic liquid 620, and pushes the second sliding rod 420 to move in the opposite direction (for example, the second magnetic liquid 620 pushes the second sliding rod 420 to move to the left).
After the mass 400 has moved to the first extreme position, for example, after the mass 400 has moved to the left to the first extreme position, the mass 400 is subjected to a restoring force to move to the right again, thereby repeating the above process, which will not be described in detail herein.
As shown in fig. 1, the first duct 200 and the second duct 300 are disposed spaced apart in a preset direction. The first duct 200 and the second duct 300 are disposed at intervals in the left-right direction. For example, the first conduit 200 is located on the left side of the mass 400 and the second conduit 300 is located on the right side of the mass 400. The mass 400 may be moved to the left to the first limit and then to the right to the second limit, or the mass 400 may be moved to the right to the second limit and then to the left to the first limit, so that the above process is repeated, which will not be described in detail herein.
In some embodiments, the third tube segment 230 and the sixth tube segment 330 are located outside the housing 100. The floor space of magnetic liquid damper 1000 is reduced. The third pipe segment 230 makes the original volume that the first gas 530 can be filled with larger, even if the first sliding rod 410 moves a larger distance, the ratio of the compressed volume of the first gas 530 to the original volume is not too small, the acting force between the first gas 530 and the first magnetic liquid 610 is not too large, and the flexibility of the movement of the mass block 400 is limited; the sixth pipe segment 330 makes the original volume that the second gas 540 can fill larger, and even when the second sliding rod 420 moves a larger distance, the ratio of the compressed volume of the second gas 540 to the original volume is not too small, and the force between the second gas 540 and the second magnetic liquid 620 is not too large, thereby limiting the flexibility of the movement of the mass 400.
By adjusting the contact area of the first slide rod 410 and the first magnetic liquid 610, the rigidity of the magnetic liquid damper can be adjusted, the rigidity being larger when the contact area is larger; by adjusting the contact area of the second slide lever 420 and the second magnetic liquid 620, the rigidity of the magnetic liquid damper can be adjusted, the rigidity being larger as the contact area is larger.
The stiffness of the magnetic liquid damper can be adjusted by adjusting the original pressure of the first gas 530 when the magnetic liquid damper is in the equilibrium position, the stiffness being greater when the pressure is greater; by adjusting the original pressure of the second gas 540 when the magnetic liquid damper is in the equilibrium position, the stiffness of the magnetic liquid damper can be adjusted, the stiffness being greater when the pressure is greater.
In some embodiments, the third tube segment 230 is the same tube segment as the second tube segment 220, and the sixth tube segment 330 is the same tube segment as the fifth tube segment 320. The first and second pipes 200 and 300 are closed pipes so that gas and liquid inside the first and second pipes 200 and 300 do not leak.
In some embodiments, the mass 400 further includes a third permanent magnet 430, a portion of the first sliding rod 410 is connected to the third permanent magnet 430, and a portion of the second sliding rod 420 is connected to the third permanent magnet 430, wherein a third magnetic liquid 630 is adsorbed on the third permanent magnet 430, and the third magnetic liquid 630 contacts the wall surface of the cavity 110. The peripheral surface of the third permanent magnet 430 is provided with a porous medium ring 440, and the pores of the porous medium ring 440 are filled with a third magnetic liquid 630. The third magnetic liquid 630 helps the mass 400 to be stably suspended in the cavity 110.
Under the influence of the vibrating mechanical energy, the mass 400 moves, the third permanent magnet 430 adsorbs the third magnetic liquid 630, and the third magnetic liquid 630 is sheared and rubbed inside, so that the mechanical energy is converted into heat energy, the third magnetic liquid 630 can be sticky to consume energy, and the vibration reduction effect is further increased.
The third magnetic liquid 630 passing through different pores of the porous medium ring 440 has different flow rates, the existence of the pores increases the solid-liquid contact area, increases the velocity gradient inside the third magnetic liquid 630, and the third magnetic liquids 630 having different flow rates can shear and rub each other when meeting each other, thereby converting mechanical energy into heat energy, so that the inside of the third magnetic liquid 630 can be viscous to consume energy, and further increasing the vibration reduction effect.
As shown in fig. 1, in some embodiments, a first sealing ring 840 is disposed between the first pipe 200 and the first sliding rod 410, and the first sealing ring 840 prevents the first magnetic liquid 610 from leaking between the first pipe 200 and the first sliding rod 410 due to gravity when used on the ground. A second sealing ring 850 is disposed between the second pipe 300 and the second sliding rod 420. The second sealing ring 850 prevents the second magnetic liquid 620 from leaking between the second pipe 300 and the second sliding rod 420 due to the influence of gravity when used on the ground.
The casing 100 is provided with a vent hole 830, and the vent hole 830 is provided with a filter screen. In use at ground level, the vents 830 allow gas to enter the cavity 110, reducing the pressure within the cavity 110 and facilitating movement of the mass 400.
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 (10)

1. A magnetic liquid shock absorber, comprising:
a housing defining a cavity;
a first conduit, at least a portion of the first conduit being disposed within the cavity;
the mass block comprises a connected first sliding rod, the first sliding rod is movably arranged in the first pipeline along the extension direction of at least one part of the first pipeline, one part of the first sliding rod extends out of the first pipeline from the first end of the first pipeline, and the second end of the first pipeline is closed;
a first porous media piece disposed within the first conduit;
a first magnetic liquid filled in the first pipe, the first magnetic liquid being located between the first porous medium member and the first slide rod in an extending direction of the first pipe, the at least a portion of the first pipe extending in a first direction; and
a first gas filled within the first tube, the first gas being between the first magnetic liquid and the second end of the first tube.
2. The magnetic liquid damper according to claim 1, wherein the first pipe comprises a first pipe section, a second pipe section, and a third pipe section connected in this order, one end of the first tube section constituting the first end of the first tube, the first tube section extending in the first direction, one end of the third pipe section forms a second end part of the first pipeline, at least one part of the first magnetic liquid is arranged at the joint of the first pipe section and the second pipe section, the first piece of porous media is disposed within the second tube segment, the first piece of porous media is adjacent the first tube segment, the first gas is arranged in the second pipe section and the third pipe section, the first sliding rod is movably arranged in the first pipe section along the first direction, and one part of the first sliding rod extends out of the first pipe section.
3. The magnetic liquid damper according to claim 2, further comprising:
the mass block further comprises a second sliding rod, the first sliding rod is movably arranged in the first pipeline along the preset direction, the second sliding rod is movably arranged in the second pipeline along the preset direction, a part of the second sliding rod extends out of the second pipeline from the first end of the second pipeline, and the second end of the second pipeline is closed;
a second porous media piece disposed within the second conduit;
a second magnetic liquid filled in the second pipe, the second magnetic liquid being located between the second porous medium member and the second slide rod in an extending direction of the second pipe, the at least a portion of the second pipe extending in the first direction; and
a second gas filled within the second pipe, the second gas being located between the second magnetic liquid and the second end of the second pipe.
4. The magnetic liquid damper according to claim 3, wherein the second pipe comprises a fourth pipe section, a fifth pipe section and a sixth pipe section which are connected in sequence, one end of the fourth tube section constituting the first end of the second tube, the fourth tube section extending in the first direction, one end of the sixth pipe section forms the second end part of the second pipeline, at least one part of the second magnetic liquid is arranged at the joint of the fourth pipe section and the fifth pipe section, the second piece of porous media is disposed within the fifth tube segment, the second piece of porous media is adjacent the fourth tube segment, the second gas is arranged in the fifth pipe section and the sixth pipe section, the second sliding rod is movably arranged in the fourth pipe section along the first direction, and one part of the second sliding rod extends out of the fourth pipe section.
5. The magnetic liquid damper according to claim 4, further comprising:
the first permanent magnet is arranged on the first sliding rod and is positioned between the first sliding rod and the first magnetic liquid in the extending direction of the first pipeline; and
and the second permanent magnet is arranged on the second sliding rod and is positioned between the second sliding rod and the second magnetic liquid in the extending direction of the second pipeline.
6. The magnetic liquid damper of claim 5, wherein the third tube segment and the sixth tube segment are located outside the housing.
7. The magnetic liquid damper according to any one of claims 3 to 6, wherein the mass further comprises a third permanent magnet, the portion of the first sliding rod is connected to the third permanent magnet, the portion of the second sliding rod is connected to the third permanent magnet, and a third magnetic liquid is adsorbed on the third permanent magnet and contacts with the wall surface of the cavity.
8. The magnetic liquid damper according to claim 7, wherein a porous medium ring is provided on a circumferential surface of the third permanent magnet, and pores of the porous medium ring are filled with the third magnetic liquid.
9. The magnetic liquid damper according to claim 7, wherein the housing is provided with a vent hole.
10. The magnetic liquid damper of claim 7, wherein a first seal ring is disposed between the first conduit and the first sliding rod, and a second seal ring is disposed between the second conduit and the second sliding rod.
CN202011254781.9A 2020-11-11 2020-11-11 Magnetic liquid vibration damper Active CN112392885B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103122960A (en) * 2013-02-08 2013-05-29 北京交通大学 Magnetic liquid damp shock absorber
CN103939618A (en) * 2014-04-29 2014-07-23 北京交通大学 Magnetic liquid sealing device for porous pole shoes
US20150021129A1 (en) * 2013-07-19 2015-01-22 Trelleborgvibracoustic Gmbh Vibration absorber and vibration absorber assembly
CN204533318U (en) * 2015-01-28 2015-08-05 北京交通大学 Permanent magnet provides the magnetic fluid damper of restoring force
WO2019185196A1 (en) * 2018-03-30 2019-10-03 Esm Energie- Und Schwingungstechnik Mitsch Gmbh Linear magnetic spring and use in vibration dampers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103122960A (en) * 2013-02-08 2013-05-29 北京交通大学 Magnetic liquid damp shock absorber
US20150021129A1 (en) * 2013-07-19 2015-01-22 Trelleborgvibracoustic Gmbh Vibration absorber and vibration absorber assembly
CN103939618A (en) * 2014-04-29 2014-07-23 北京交通大学 Magnetic liquid sealing device for porous pole shoes
CN204533318U (en) * 2015-01-28 2015-08-05 北京交通大学 Permanent magnet provides the magnetic fluid damper of restoring force
WO2019185196A1 (en) * 2018-03-30 2019-10-03 Esm Energie- Und Schwingungstechnik Mitsch Gmbh Linear magnetic spring and use in vibration dampers

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