CN112196927B

CN112196927B - Magnetic liquid damping shock absorber based on first-order and second-order buoyancy principle

Info

Publication number: CN112196927B
Application number: CN202011144774.3A
Authority: CN
Inventors: 李德才; 韩鹏栋; 李倩; 李英松; 任思杰
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-08-17
Anticipated expiration: 2040-10-23
Also published as: CN112196927A

Abstract

The invention provides a magnetic liquid damping shock absorber based on a first-order and second-order buoyancy principle. The housing defines a first enclosed cavity. The first permanent magnet and the second permanent magnet are both arranged on the shell. The non-magnetic conductive shell is positioned in the first closed cavity, the non-magnetic conductive shell limits a second closed cavity, and a first magnetic liquid cavity is limited between the non-magnetic conductive shell and the shell. The suspension permanent magnet is positioned in the second closed cavity, and a second magnetic liquid cavity is defined between the suspension permanent magnet and the non-magnetic conductive shell. The first magnetic liquid fills a part of the first magnetic liquid chamber, and the second magnetic liquid fills a part of the second magnetic liquid chamber. The magnetic liquid damping vibration absorber provided by the embodiment of the invention has the advantages of excellent vibration absorption effect and more sensitive response to vibration with small amplitude and low frequency.

Description

Magnetic liquid damping shock absorber based on first-order and second-order buoyancy principle

Technical Field

The invention relates to the field of mechanical engineering vibration control, in particular to a magnetic liquid damping vibration absorber based on first-order and second-order buoyancy principles.

Background

The magnetic liquid is a novel functional material with fluidity and magnetism, and the unique property of the magnetic liquid enables the magnetic liquid to have extremely wide application in the engineering field. The magnetic liquid damping shock absorber is a passive shock absorber, has high sensitivity to inertial force, and has the advantages of simple structure, small volume, large energy consumption, long service life and the like. Therefore, the magnetic liquid damping vibration absorber is widely applied to the vibration attenuation of long and straight objects (such as solar sailboards, antennas and the like of space stations) of large-scale spacecrafts with low frequency and small amplitude. Meanwhile, the vibration reduction device has wide application prospect on the ground, such as vibration reduction of a large-power antenna with the length of hundreds of meters, vibration reduction of a precision balance and the like.

However, the magnetic liquid damping shock absorbers in the related art cannot be applied in engineering practice due to various structural problems. For example, in CN102032304A, a cylindrical permanent magnet is used as a damping mass, and the permanent magnet is suspended in a housing by using a magnetic liquid second-order buoyancy principle, because the housing is filled with a magnetic liquid, the movement of the permanent magnet is very slow, and the magnetic liquid is difficult to flow between the permanent magnet and the housing, so that the damping effect of the damper is poor. For another example, CN104895983A uses the first-order buoyancy principle of magnetic liquid to suspend a non-magnetic conductive mass in a housing, but since the mass is not effectively constrained in the radial direction, radial disturbance is likely to occur, resulting in the mass being prone to tilt when subjected to vibration and to collide with the housing wall, and since the housing is filled with magnetic liquid, the motion of the mass is limited, and therefore, the method still has no practical application.

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 a magnetic liquid damping vibration absorber based on the first-order and second-order buoyancy principles, which has excellent vibration absorption effect and sensitive response to vibration with small amplitude and low frequency.

The magnetic liquid damping shock absorber based on the first-order and second-order buoyancy principles according to the embodiment of the invention comprises: a housing defining a first enclosed cavity; the first permanent magnet and the second permanent magnet are both arranged on the shell, and the first permanent magnet is opposite to the second permanent magnet in a first preset direction; the non-magnetic conduction shell is positioned in the first closed cavity, the non-magnetic conduction shell is positioned between the first permanent magnet and the second permanent magnet in the first preset direction, the non-magnetic conduction shell defines a second closed cavity, and a first magnetic liquid cavity is defined between the non-magnetic conduction shell and the shell; the suspension permanent magnet is positioned in the second closed cavity, and a second magnetic liquid cavity is defined between the suspension permanent magnet and the non-magnetic conductive shell; a first magnetic liquid filling a part of the first magnetic liquid chamber; a second magnetic liquid filling a part of the second magnetic liquid chamber.

According to the magnetic liquid damping shock absorber provided by the embodiment of the invention, the two shock absorption units are arranged, when the magnetic liquid damping shock absorber is vibrated by the outside, the two shock absorption units simultaneously play a shock absorption role based on the first-order buoyancy principle and the second-order buoyancy principle respectively, so that the magnetic liquid damping shock absorber can dissipate vibration energy more quickly when a damped object generates mechanical vibration, the vibration energy dissipation efficiency and the shock absorption effect can be improved, and the magnetic liquid damping shock absorber can absorb vibration more quickly and better. In addition, the first magnetic liquid is not filled in the first magnetic liquid cavity, and the second magnetic liquid is not filled in the second magnetic liquid cavity, so that cavities are formed in the first magnetic liquid cavity and the second magnetic liquid cavity, and the first vibration damping unit and the second vibration damping unit move more flexibly, so that the magnetic liquid damping vibration absorber provided by the invention is more sensitive to vibration with small amplitude and low frequency.

Therefore, the magnetic liquid damping vibration absorber provided by the embodiment of the invention has the advantages of excellent vibration absorption effect and more sensitive response to vibration with small amplitude and low frequency.

In addition, the magnetic liquid damping shock absorber based on the first-order and second-order buoyancy principles of the invention also has the following additional technical characteristics:

in some embodiments, the housing, the first closed cavity, the non-magnetic shell, the second closed cavity, and the suspended permanent magnet are all cylindrical, the axial directions of the housing, the first closed cavity, the non-magnetic shell, the second closed cavity, and the suspended permanent magnet are the same, and the first preset direction is the axial direction of the housing.

In some embodiments, the magnetic liquid damping shock absorber further includes a permanent magnet ring, the permanent magnet ring is in a circular ring shape, the permanent magnet ring is sleeved on the outer shell, an axial direction of the permanent magnet ring is the same as an axial direction of the outer shell, and the permanent magnet ring is axially magnetized.

In some embodiments, the permanent magnet ring comprises a plurality of permanent magnet rings, the plurality of permanent magnet rings are arranged along the axial direction of the outer shell, and optionally, the plurality of permanent magnet rings are opposite to each other in the same pole.

In some embodiments, the housing includes a shell having a top opening, and an end cap mounted to the shell, the end cap covering the top opening, the shell and the end cap defining the first enclosed cavity, the first permanent magnet being attached to the end cap, and the second permanent magnet being attached to the shell.

In some embodiments, the first permanent magnet is cylindrical, and the first permanent magnet is disposed inside or outside the end cap; or the first permanent magnet is provided with a central hole, the central hole penetrates through the first permanent magnet along the first preset direction, and the magnetic liquid damping shock absorber further comprises: the first magnetism isolating cover is connected with the inner side or the outer side of the end cover, and a first magnetism isolating cavity is defined between the first magnetism isolating cover and the end cover; and the first iron core is cylindrical, the first iron core is matched in the central hole of the first permanent magnet, and the first iron core and the first permanent magnet are matched in the first magnetism isolating cavity.

In some embodiments, the second permanent magnet is cylindrical, and the second permanent magnet is arranged on the inner side or the outer side of the bottom of the shell; or the second permanent magnet is provided with a central hole, the central hole penetrates through the second permanent magnet along the first preset direction, and the magnetic liquid damping shock absorber further comprises: the second magnetic isolation cover is connected with the inner side or the outer side of the bottom of the shell and defines a second magnetic isolation cavity with the bottom of the shell; and the second iron core is cylindrical, the second iron core is matched in the central hole of the second permanent magnet, and the second iron core and the second permanent magnet are matched in the second magnetism isolating cavity.

In some embodiments, the magnetic liquid damping shock absorber further comprises a socket spring fitted in the second closed cavity, and the levitating permanent magnet is located in a central accommodating cavity of the socket spring, wherein a second magnetic liquid is filled between the socket spring and the levitating permanent magnet, the socket spring has a plurality of turns, and a second magnetic liquid is filled between two adjacent turns of the socket spring.

In some embodiments, the levitating permanent magnet is axially or radially magnetized.

In some embodiments, the magnetic liquid damping shock absorber further includes a first triangular reinforcing rib and a second triangular reinforcing rib, the plurality of permanent magnet rings are located between the first triangular reinforcing rib and the second triangular reinforcing rib in a first preset direction, each of the first triangular reinforcing rib and the second triangular reinforcing rib includes a plurality of permanent magnet rings, and the plurality of first triangular reinforcing ribs and the plurality of second triangular reinforcing ribs are connected to the housing so as to fixedly mount the plurality of permanent magnet rings on the housing.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a magnetic liquid damping shock absorber according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a socket spring according to an embodiment of the present invention.

Fig. 3 is a first schematic distribution diagram of triangular reinforcing ribs according to an embodiment of the invention.

Fig. 4 is a second schematic distribution diagram of the triangular reinforcing ribs according to the embodiment of the invention.

Reference numerals:

magnetic liquid damping shock absorber 100;

a housing 1; an end cap 2; a first permanent magnet 3; a first triangular reinforcing rib 41; the second triangular reinforcing rib 42; a first cavity 51; a second cavity 52; a first magnetic liquid 6; a socket spring 7; a second magnetic liquid 8; a non-magnetically conductive housing 9; a second magnetism isolating cover 10; a second core 11; a second permanent magnet 12; a suspended permanent magnet 13; a first permanent magnet ring 14; a second permanent magnet ring 15; a third permanent magnet ring 16; a fourth permanent magnet ring 17; and a seal ring 18.

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 damping shock absorber 100 based on the first and second order buoyancy principles according to an embodiment of the present invention will be described with reference to fig. 1 to 4.

As shown in fig. 1, a magnetic liquid damping shock absorber 100 according to an embodiment of the present invention includes a housing, a first permanent magnet 3, a second permanent magnet 12, a non-magnetic conductive housing 9, a levitation permanent magnet 13, a first magnetic liquid 6, and a second magnetic liquid 8.

The housing defines a first enclosed cavity. First permanent magnet 3 and second permanent magnet 12 all set up on the shell, and first permanent magnet 3 is relative in first predetermined direction with second permanent magnet 12. For convenience of description, the first predetermined direction is a direction indicated by an arrow E in fig. 1. A magnetic field is formed between the first permanent magnet 3 and the second permanent magnet 12.

A non-magnetically conductive housing 9 is located in the first enclosed cavity. The non-magnetically conductive housing 9 is located between the first permanent magnet 3 and the second permanent magnet 12 in a first predetermined direction. As shown in fig. 1, the first permanent magnet 3 and the second permanent magnet 12 are respectively located above and below the non-magnetic conductive housing 9, and the non-magnetic conductive housing 9 is located in the magnetic field formed by the first permanent magnet 3 and the second permanent magnet 12. The non-magnetically permeable housing 9 defines a second enclosed cavity. A first magnetic fluid chamber is defined between the non-magnetically permeable casing 9 and the housing.

A levitating permanent magnet 13 is located in a second enclosed cavity defined by the non-magnetically permeable housing 9. A second magnetic fluid chamber is defined between the levitating permanent magnet 13 and the non-magnetically permeable housing 9.

The first magnetic liquid 6 fills a part of the first magnetic liquid chamber, that is, the first magnetic liquid 6 is not located in the first magnetic liquid chamber fully. The second magnetic liquid 8 fills a part of the second magnetic liquid chamber, that is, the second magnetic liquid 8 is not located in the second magnetic liquid chamber fully. That is, a part of the first magnetic liquid chamber is filled with the first magnetic liquid 6, and the other part forms the first cavity 51. A part of the second magnetic liquid chamber is filled with the second magnetic liquid 8, and the other part forms a second cavity 52. It should be noted that the shape of the first magnetic liquid 6 in the first magnetic liquid chamber and the first cavity 51 is related to the force state of the magnetic liquid damping shock absorber 100, and is not limited herein. The second magnetic liquid 8 in the second magnetic liquid chamber and the second cavity 52 have the same shape.

The non-magnetic conductive shell 9, the second magnetic liquid 8 in the non-magnetic conductive shell 9 and the suspension permanent magnet 13 form a first vibration reduction unit, and the suspension permanent magnet 13 forms a second vibration reduction unit. The first magnetic liquid 6 suspends the first vibration reduction unit in the first closed cavity under the action of the magnetic fields of the first permanent magnet 3 and the second permanent magnet 12, and the second magnetic liquid 8 suspends the second vibration reduction unit (namely, the suspended permanent magnet 13) in the second closed cavity under the action of the magnetic field of the suspended permanent magnet 13.

When the magnetic liquid damping shock absorber 100 is subjected to external vibration, relative motion occurs between the first shock absorption unit and the housing, and the first magnetic liquid 6 flows between the first shock absorption unit and the housing, so that extrusion, friction and viscous shear are generated inside the first magnetic liquid 6, between the first magnetic liquid 6 and the first shock absorption unit, and between the first magnetic liquid 6 and the housing to consume energy, thereby achieving the effect of shock absorption, wherein the shock absorption process is based on the first-order buoyancy principle of the magnetic liquid. Meanwhile, relative motion occurs between the second vibration damping unit and the non-magnetic conductive shell 9, and the second magnetic liquid 8 flows between the second vibration damping unit and the non-magnetic conductive shell 9, so that extrusion, friction and viscous shearing are generated inside the second magnetic liquid 8 and between the second magnetic liquid 8 and the second vibration damping unit and between the second magnetic liquid 8 and the non-magnetic conductive shell 9 to consume energy, and thus the vibration damping effect is achieved, and the vibration damping process is based on the second-order buoyancy principle of the magnetic liquid. Therefore, the magnetic liquid damping shock absorber 100 provided by the invention is the magnetic liquid damping shock absorber 100 based on the first-order buoyancy principle and the second-order buoyancy principle of the magnetic liquid.

As shown in fig. 1, in some embodiments, the housing, the first enclosed cavity, the non-magnetic conductive housing 9, the second enclosed cavity, and the levitating permanent magnet 13 are all cylindrical. And the axial directions of the shell, the first closed cavity, the non-magnetic conductive shell 9, the second closed cavity and the floating permanent magnet 13 are the same. The first predetermined direction is the axial direction of the housing, i.e. the direction indicated by arrow E in fig. 1.

In some embodiments, the diameter of the non-magnetic conductive housing 9 is 1/4-2/5 of the first closed cavity diameter. The diameter of the suspension permanent magnet 13 is 1/4-2/5 of the diameter of the second closed cavity. The volume of the first magnetic liquid 6 is 1/9-1/3 of the volume of the first magnetic liquid chamber (first closed cavity), and the volume of the second magnetic liquid 8 is 1/9-1/3 of the volume of the second magnetic liquid chamber (second closed cavity).

Optionally, the first magnetic liquid 6 is a kerosene-based magnetic liquid. The second magnetic liquid 8 is an oil-based magnetic liquid.

In some embodiments, the levitating permanent magnet 13 is axially or radially magnetized. As shown in fig. 1, the levitating permanent magnet 13 is radially magnetized. The radial magnetization means that the magnetization direction of the levitation permanent magnet 13 is along the radial direction thereof.

Optionally, the material of the suspended permanent magnet 13 is rubidium, iron and boron.

In some embodiments, as shown in FIG. 1, embodiments of the present invention provide a magnetic liquid damping shock absorber 100 further comprising a permanent magnet ring. The permanent magnetic ring is in a circular ring structure, the permanent magnetic ring is sleeved on the shell, and the axial direction of the permanent magnetic ring is the same as that of the shell. The permanent magnet ring is axially magnetized, and the axial magnetization of the permanent magnet ring means that the magnetization direction of the permanent magnet ring is along the axial direction of the permanent magnet ring, namely the N pole and the S pole of the permanent magnet ring are distributed along the axial direction of the permanent magnet ring.

By way of example, the permanent magnet ring comprises a plurality of permanent magnet rings, and the plurality of permanent magnet rings are arranged along the axial direction of the shell. That is, the plurality of permanent magnet rings are arranged on the outer peripheral wall of the housing in the axial direction of the housing, and the plurality of permanent magnet rings are abutted against each other. Optionally, the plurality of permanent magnet rings are connected to each other by welding. The number of permanent magnet rings may be determined by the size of the housing in the first predetermined direction.

Preferably, adjacent permanent magnet rings in the plurality of permanent magnet rings are opposite in homopolar, that is, adjacent permanent magnet rings in the plurality of permanent magnet rings are opposite in magnetic pole with the same polarity. The homopolar of adjacent permanent magnet rings can relatively enhance the magnetic field intensity of the permanent magnet rings to a great extent, and the increased magnetic field intensity of the permanent magnet rings can enable the vibration reduction efficiency of the magnetic liquid damping vibration absorber 100 to be higher on one hand, and can provide effective constraint force for the first vibration reduction unit in the radial direction on the other hand, so that the possibility of rigid collision between the non-magnetic conductive shell 9 and the shell is greatly reduced. It can also be said that the permanent magnet ring provides a circumferential restoring force for the first damping unit.

In addition, compared with the permanent magnet rings with opposite poles, the permanent magnet rings with opposite poles have stronger magnetic field intensity and larger magnetic field force. Therefore, under the condition of meeting a certain magnetic field intensity, the permanent magnet rings with the same poles opposite to each other need less permanent magnet rings compared with the permanent magnet rings with different poles opposite to each other, so that the mass of the magnetic liquid damping shock absorber 100 can be reduced.

Alternatively, as shown in fig. 1, the permanent magnet ring includes a first permanent magnet ring 14, a second permanent magnet ring 15, a third permanent magnet ring 16, and a fourth permanent magnet ring 17. The first permanent magnet ring 14, the second permanent magnet ring 15, the third permanent magnet ring 16 and the fourth permanent magnet ring 17 are shown arranged from below to above in fig. 1.

In some embodiments, as shown in fig. 1, when the permanent magnet ring includes a plurality of permanent magnet rings, the magnetic liquid damping shock absorber 100 according to the embodiment of the present invention further includes a first triangular reinforcing rib 41 and a second triangular reinforcing rib 42. The plurality of permanent magnet rings are located between the first triangular reinforcing rib 41 and the second triangular reinforcing rib 42 in the first preset direction. That is, the first and second triangular reinforcing

ribs

41 and 42 are located above and below the plurality of permanent magnet rings, respectively. The first triangular reinforcing rib 41 and the second triangular reinforcing rib 42 are used for fixing the plurality of permanent magnet rings on the housing, and play a role in reinforcing the installation stability.

As an example, each of the first and second triangular reinforcing

ribs

41 and 42 includes a plurality of first triangular reinforcing ribs 41 pressed against an upper surface of an uppermost permanent magnet ring, and a plurality of second triangular reinforcing ribs 42 abutted against a lower surface of a lowermost permanent magnet ring. As shown in fig. 1, the plurality of first triangular reinforcing ribs 41 are pressed against the upper surface of the fourth permanent magnet ring 17, and the plurality of second triangular reinforcing ribs 42 are in contact with the lower surface of the first permanent magnet ring 14.

Preferably, the plurality of first triangular reinforcing ribs 41 are uniformly arranged in the circumferential direction of the permanent magnet ring. The plurality of second triangular reinforcing ribs 42 are uniformly arranged in the circumferential direction of the permanent magnet ring. Taking the first triangular reinforcing rib 41 as an example, when the number of the first triangular reinforcing ribs 41 is four, the positional relationship between the four first triangular reinforcing ribs 41 and the permanent magnet ring is as shown in fig. 3. When the number of the first triangular reinforcing ribs 41 is six, the positional relationship between the six first triangular reinforcing ribs 41 and the permanent magnet ring is as shown in fig. 4. The position relationship between the second triangular reinforcing rib 42 and the permanent magnet ring is the same. The arrangement makes the structure of the magnetic liquid damping shock absorber 100 more reasonable, and also makes the installation of the permanent magnet ring more stable.

In some embodiments, as shown in fig. 1, the housing comprises a housing 1 and an end cap 2. The housing 1 has a top opening, and the end cap 2 is mounted on the housing 1 with the end cap 2 covering the top opening. The housing 1 and end cap 2 define a first enclosed cavity. As an example, the first permanent magnet 3 is connected to the end cap 2, and the second permanent magnet 12 is connected to the bottom of the housing 1.

In some embodiments, the first permanent magnet 3 is cylindrical and the first permanent magnet 3 is disposed inside or outside the end cap 2. As shown in fig. 1, the first permanent magnet 3 is disposed inside the end cap 2. The arrangement of the first permanent magnet 3 on the inner side of the end cap 2 can enhance the magnetic field strength in the housing, thereby facilitating the suspension of the first damping unit. As an example, as shown in fig. 1, the first permanent magnet 3 is axially magnetized, and the axially magnetized means that the magnetizing direction of the first permanent magnet 3 is along the axial direction thereof, that is, the N pole and the S pole of the first permanent magnet 3 are distributed along the axial direction thereof. As shown in fig. 1, the N pole and S pole of the first permanent magnet 3 are distributed at the lower end and upper end of the first permanent magnet 3.

In some embodiments, the second permanent magnet 12 has a central hole (central through hole) that penetrates the second permanent magnet 12 in a first preset direction. Magnetic liquid damping shock absorber 100 further comprises: a second flux shield 10 and a second core 11. The second magnetism isolating cover 10 is connected with the inner side or the outer side of the bottom of the shell 1 and defines a second magnetism isolating cavity with the bottom of the shell 1. The second iron core 11 is cylindrical, the second iron core 11 is matched in a central hole of the second permanent magnet 12, and the second iron core 11 and the second permanent magnet 12 are both matched in the second magnetism isolating cavity. The second iron core 11 and the second permanent magnet 12 are coaxial. As shown in fig. 1, a second magnetism isolating cover 10 is attached to the outside of the bottom of the case 1, and a second permanent magnet 12 is fixed to the outside of the bottom of the case 1. As an example, as shown in fig. 1, the second permanent magnet 12 is magnetized in a radial direction, and the radial magnetization refers to that the magnetizing direction of the second permanent magnet 12 is along the radial direction thereof, that is, the N pole and the S pole of the second permanent magnet 12 are distributed along the radial direction thereof. As shown in fig. 1, the N pole and S pole of the second permanent magnet 12 are distributed outside and inside the second permanent magnet 12. The second iron core 11 functions to concentrate the lines of magnetic induction of the second permanent magnet 12, that is, functions to enhance the strength of the magnetic field in the housing. The second magnetism isolating cover 10 avoids the occurrence of magnetic leakage phenomenon. The arrangement of the second core 11 and the second flux shield 10 enables the first damping unit to be better suspended in the first closed cavity.

Preferably, the end cap 2, the first permanent magnet 3 and the second permanent magnet 12 are all symmetrically mounted with respect to the axial direction of the housing, so that the structure of the magnetic liquid damping shock absorber 100 is more reasonable.

In other embodiments, the first permanent magnet 3 has a central hole (central through hole) that penetrates the first permanent magnet 3 in a first preset direction. The magnetic liquid damping shock absorber further comprises: first magnetism shield and first iron core. The first magnetism isolating cover is connected with the inner side or the outer side of the end cover 2 and defines a first magnetism isolating cavity with the end cover 2. The first iron core is cylindrical and is matched in a center hole of the first permanent magnet 3, and the first iron core and the first permanent magnet are both matched in the first magnetism isolating cavity. Optionally, the first permanent magnet 3 is radially magnetized.

In other embodiments, the second permanent magnet 12 is cylindrical, and the second permanent magnet 12 is disposed inside or outside the bottom of the housing 1. Optionally, the second permanent magnet 12 is axially magnetized.

In some embodiments, as shown in FIGS. 1 and 2, magnetic liquid damping shock absorber 100 further includes a socket spring 7. A socket spring 7 is fitted in the second closed cavity, the socket spring 7 having a central receiving cavity. The suspension permanent magnet 13 is positioned in the middle accommodating cavity of the socket spring 7, namely the socket spring 7 is sleeved on the suspension permanent magnet 13. Second magnetic liquid 8 is filled between the nest spring 7 and the suspension permanent magnet 13, the nest spring 7 has a plurality of circles, and the second magnetic liquid 8 is filled between two adjacent circles of the nest spring 7. The nest spring 7 can play a role in buffering and absorbing vibration, and the second magnetic liquid 8 is arranged between two adjacent circles of the nest spring 7, so that when the magnetic liquid damping vibration absorber 100 is vibrated from the outside, the second magnetic liquid 8 between two adjacent circles of the nest spring 7 and the wall of the nest spring 7 can be squeezed, rubbed and sheared by viscosity to consume energy, and the vibration absorption effect of the magnetic liquid damping vibration absorber 100 is better.

Optionally, the socket spring 7 is welded to the inner wall of the non-magnetically conductive housing 9.

In some embodiments, as shown in FIG. 1, magnetic liquid damping shock absorber 100 further comprises a seal ring 18, seal ring 18 being located at the junction of end cap 2 and housing 1.

Optionally, the end cap 2 has a sealing groove in which the sealing ring 18 is located, the housing 1 abutting against the sealing ring 18. Alternatively, the housing 1 has a sealing groove, the sealing ring 18 is located in the sealing groove, and the end cap 2 abuts against the sealing ring 18. The seal ring 18 functions as a seal to prevent the first magnetic liquid 6 from leaking.

Alternatively, the end cap 2 is connected to the housing 1 by fixing bolts.

The connection relationship between the parts of magnetic liquid damping shock absorber 100 shown in FIG. 1 is as follows:

locate the below of end cover 2 with first permanent magnet 3, the connected mode of first permanent magnet 3 and end cover 2 is welding, bonding or threaded connection.

The whole formed by the second permanent magnet 12, the second iron core 11 and the second magnetism isolating cover 10 is fixedly connected to the outer side of the bottom of the shell 1, namely below the shell 1. The connection mode can adopt welding, bonding or screw connection and the like. The second iron core 11 and the second permanent magnet 12 are connected by bonding or welding.

The first permanent magnet ring 14, the second permanent magnet ring 15, the third permanent magnet ring 16 and the fourth permanent magnet ring 17 are welded and connected with each other to form a whole, the whole is sleeved on the outer side of the shell 1, the first permanent magnet ring 14, the second permanent magnet ring 15, the third permanent magnet ring 16 and the fourth permanent magnet ring 17 are fixed with the shell 1 through the first triangular reinforcing ribs 41 and the second triangular reinforcing ribs 42, and the first permanent magnet ring 14, the second permanent magnet ring 15, the third permanent magnet ring 16 and the fourth permanent magnet ring 17 are fixed with the shell 1, and the first triangular reinforcing ribs 41 and the second triangular reinforcing ribs 42 can be fixed with the shell 1 through welding or threaded connection.

The nest spring 7 is welded on the inner wall of the non-magnetic conductive shell 9, the suspended permanent magnet 13 is placed in the middle accommodating cavity of the nest spring 7, the second magnetic liquid 8 is injected into the non-magnetic conductive shell 9, and finally the non-magnetic conductive shell 9 is sealed. The levitating permanent magnet 13 will be levitated in the non-magnetic conductive housing 9 according to the second order buoyancy principle of the magnetic liquid.

The sealed non-magnetic conductive casing 9 is put into the casing 1, and the first magnetic liquid 6 is injected into the casing 1. The non-magnetic conductive housing 9 will be suspended in the housing 1 according to the principle of first order buoyancy of the magnetic liquid. The sealing ring 18 is put into the sealing groove of the end cover 2, and the end cover 2 is fixedly connected with the shell 1 in a sealing way by using nuts and bolts.

In operation of magnetic liquid damping shock absorber 100 as shown in FIG. 1, damping shock absorber 100 is mounted on a device to be damped. When a device to be damped vibrates, relative motion occurs between a first damping unit formed by the non-magnetic-conductive shell 9, the second magnetic liquid 8 in the non-magnetic-conductive shell 9 and the suspension permanent magnet 13 and the shell, and meanwhile, relative motion occurs between the second damping unit and the non-magnetic-conductive shell 9, and the mechanical energy of the vibration can be converted into heat energy by the shearing force in the first magnetic liquid 6, the friction force between the first magnetic liquid 6 and the first damping unit, the friction force between the first magnetic liquid 6 and the shell, the shearing force in the second magnetic liquid 8, the friction force between the second magnetic liquid 8 and the second damping unit, and the friction force between the second magnetic liquid 8 and the non-magnetic-conductive shell 9, so that the damping effect is realized.

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

1. A magnetic liquid damping shock absorber based on first and second order buoyancy principle, comprising:

a housing defining a first enclosed cavity;

the first permanent magnet and the second permanent magnet are both arranged on the shell, and the first permanent magnet is opposite to the second permanent magnet in a first preset direction;

the non-magnetic conduction shell is positioned in the first closed cavity, the non-magnetic conduction shell is positioned between the first permanent magnet and the second permanent magnet in the first preset direction, the non-magnetic conduction shell defines a second closed cavity, and a first magnetic liquid cavity is defined between the non-magnetic conduction shell and the shell;

the suspension permanent magnet is positioned in the second closed cavity, and a second magnetic liquid cavity is defined between the suspension permanent magnet and the non-magnetic conductive shell;

a first magnetic liquid filling a part of the first magnetic liquid chamber;

a second magnetic liquid filling a part of the second magnetic liquid chamber.

2. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 1, wherein the outer shell, the first closed cavity, the non-magnetically conductive shell, the second closed cavity and the suspended permanent magnet are all cylindrical, axial directions of the outer shell, the first closed cavity, the non-magnetically conductive shell, the second closed cavity and the suspended permanent magnet are the same, and the first preset direction is the axial direction of the outer shell.

3. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 2, further comprising a permanent magnet ring, wherein the permanent magnet ring is of a circular ring structure, the permanent magnet ring is sleeved on the outer shell, the axial direction of the permanent magnet ring is the same as the axial direction of the outer shell, and the permanent magnet ring is axially magnetized.

4. The first and second order buoyancy based magnetic liquid damping shock absorber according to claim 3 wherein said permanent magnet ring comprises a plurality of said permanent magnet rings arranged axially along said housing, optionally with a plurality of said permanent magnet rings homopolar opposed.

5. The first and second order buoyancy principle based magnetic liquid damping shock absorber according to claim 2 wherein said housing comprises a shell having a top opening and an end cap mounted to said shell, said end cap covering said top opening, said shell and said end cap defining said first enclosed cavity, said first permanent magnet attached to said end cap, said second permanent magnet attached to said shell.

6. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 5, wherein the first permanent magnet is cylindrical, and the first permanent magnet is disposed inside or outside the end cap; or

The first permanent magnet is provided with a central hole, the central hole penetrates through the first permanent magnet along a first preset direction, and the magnetic liquid damping shock absorber further comprises:

the first magnetism isolating cover is connected with the inner side or the outer side of the end cover, and a first magnetism isolating cavity is defined between the first magnetism isolating cover and the end cover; and

the first iron core is cylindrical and is matched in the central hole of the first permanent magnet, and the first iron core and the first permanent magnet are matched in the first magnetism isolating cavity.

7. The first and second order buoyancy principle based magnetic liquid damping shock absorber according to claim 5,

the second permanent magnet is cylindrical and is arranged on the inner side or the outer side of the bottom of the shell; or

The second permanent magnet has a center hole, the center hole runs through the second permanent magnet along the first preset direction, and the magnetic liquid damping vibration absorber further comprises:

the second magnetic isolation cover is connected with the inner side or the outer side of the bottom of the shell and defines a second magnetic isolation cavity with the bottom of the shell; and

the second iron core is cylindrical and is matched in the central hole of the second permanent magnet, and the second iron core and the second permanent magnet are matched in the second magnetism isolating cavity.

8. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 2, further comprising a socket spring fitted in the second closed cavity, wherein the levitating permanent magnet is located in a central receiving cavity of the socket spring, wherein a second magnetic liquid is filled between the socket spring and the levitating permanent magnet, the socket spring has a plurality of turns, and a second magnetic liquid is filled between two adjacent turns of the socket spring.

9. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 2, wherein the levitating permanent magnet is axially magnetized or radially magnetized.

10. The first-order and second-order buoyancy principle-based magnetic liquid damping shock absorber according to claim 4, further comprising a first triangular reinforcing rib and a second triangular reinforcing rib, wherein the plurality of permanent magnet rings are located between the first triangular reinforcing rib and the second triangular reinforcing rib in the first preset direction, each of the first triangular reinforcing rib and the second triangular reinforcing rib comprises a plurality of permanent magnet rings, and the plurality of first triangular reinforcing ribs and the plurality of second triangular reinforcing ribs are connected with the housing so as to fixedly mount the plurality of permanent magnet rings on the housing.