CN214221874U

CN214221874U - Drawer type magnetic liquid damping vibration absorber

Info

Publication number: CN214221874U
Application number: CN202022393067.XU
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: 2021-09-17
Anticipated expiration: 2030-10-23

Abstract

The utility model provides a drawer type magnetic liquid damping shock absorber, magnetic liquid damping shock absorber includes casing, first permanent magnet, second permanent magnet, third permanent magnet, fourth permanent magnet and magnetic liquid. The housing defines an enclosed cavity. The first permanent magnet and the second permanent magnet are connected through a first connecting rod, the third permanent magnet and the fourth permanent magnet are connected through a second connecting rod, the third permanent magnet is located between the first permanent magnet and the second permanent magnet in the first direction, the second permanent magnet is located between the third permanent magnet and the fourth permanent magnet in the first direction, and the first permanent magnet and the third permanent magnet, the third permanent magnet and the second permanent magnet, and the second permanent magnet and the fourth permanent magnet are opposite in homopolar direction in the first direction. The magnetic liquid damping shock absorber has the advantages of high shock absorption efficiency, excellent shock absorption effect and the like.

Description

Drawer type magnetic liquid damping vibration absorber

Technical Field

The utility model belongs to the technical field of mechanical engineering vibration control and specifically relates to a drawer type magnetic liquid damping shock absorber is related to.

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 absorber in the prior art still has the problems of unsatisfactory damping effect, low damping efficiency and the like, and restricts the practical production and application of the magnetic liquid damping shock absorber.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the embodiment of the present invention provides a drawer-type magnetic liquid damping shock absorber, which has the advantages of high damping efficiency, excellent damping effect, etc.

According to the utility model discloses drawer type magnetism liquid damping shock absorber, include: the casing is used for limiting a closed cavity, the wall surfaces of the closed cavity comprise a peripheral wall surface, a first side wall surface and a second side wall surface, the first side wall surface and the second side wall surface are opposite in a first direction, and the peripheral wall surface is located between the first side wall surface and the second side wall surface in the first direction; the first permanent magnet and the second permanent magnet are connected through a first connecting rod; third permanent magnet and fourth permanent magnet, the third permanent magnet with the fourth permanent magnet passes through the second connective bar and links to each other, the third permanent magnet is in first direction is located first permanent magnet with between the second permanent magnet, the second permanent magnet is in first direction is located the third permanent magnet with between the fourth permanent magnet, first lateral wall face is in first direction with first permanent magnet is relative, the second lateral wall face is in first direction with the fourth permanent magnet is relative, first connective bar passes the third permanent magnet, the second connective bar passes the second permanent magnet, wherein first permanent magnet with the third permanent magnet, the third permanent magnet with the second permanent magnet, the second permanent magnet with the fourth permanent magnet is in first direction homopolar is relative, first permanent magnet, A gap is formed between the peripheral surface and the peripheral wall surface of each of the second permanent magnet, the third permanent magnet and the fourth permanent magnet; and a magnetic liquid, the magnetic liquid being located in the gap.

According to the utility model discloses drawer type magnetic liquid damping shock absorber that provides is provided with first damping unit and second damping unit, and relative motion between first damping unit and the second damping unit can be regarded as the relative motion of drawer type. Thereby work as the embodiment of the utility model provides a when magnetic liquid damping shock absorber receives external vibration, except taking place passive relative motion between first damping unit and the second damping unit, still can be owing to take place initiative relative motion with the magnetic pole repulsion, thereby increased the reciprocating motion's of first damping unit and second damping unit frequency, and then can improve the ability of magnetic liquid damping shock absorber energy consumption, the damping effect and the damping efficiency of magnetic liquid damping shock absorber consequently improve.

Therefore, the embodiment of the utility model provides a magnetic liquid damping shock absorber has advantages such as damping efficiency is high, the damping effect is excellent.

In addition, according to the utility model discloses a drawer type magnetic liquid damping shock absorber still has following additional technical characterstic:

in some embodiments, each of the closed cavity, the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet is cylindrical and axially identical, and the first direction is an axial direction of the closed cavity.

In some embodiments, the number of the first connecting rods is one, the number of the second connecting rods is multiple, the central axis of the first connecting rod coincides with the central axis of the second permanent magnet, the multiple second connecting rods surround the first connecting rod in the circumferential direction of the closed cavity, and optionally, the central axis of symmetry of the multiple second connecting rods coincides with the central axis of the first connecting rod.

In some embodiments, a first through hole is formed in the third permanent magnet, a second through hole is formed in the second permanent magnet, the first connecting rod penetrates through the first through hole, and the second connecting rod penetrates through the second through hole; the diameter of the first through hole is larger than that of the first connecting rod corresponding to the first through hole, and the diameter of the second through hole is larger than that of the second connecting rod corresponding to the second through hole.

In some embodiments, a first elastic pad is disposed on at least one of the wall surface of the first through hole and the first connection rod, and a second elastic pad is disposed on at least one of the wall surface of the second through hole and the second connection rod.

In some embodiments, a protrusion structure is disposed on the peripheral wall surface, and the protrusion structure is located between the second permanent magnet and the third permanent magnet in the first direction.

In some embodiments, the protrusion structure is annular and extends from the peripheral wall surface to a central axis of the closed cavity along a radial direction of the closed cavity, wherein the protrusion structure has a first surface and a second surface opposite to each other in the first direction, and a cushion is provided on each of the first surface and the second surface.

In some embodiments, the first connecting rod, the second connecting rod, and the housing are all non-magnetically permeable materials.

In some embodiments, the first, second, third, and fourth permanent magnets are all axially magnetized.

In some embodiments, the gap is annular, optionally the magnetic liquid fills the gap to divide the enclosed cavity into a plurality of enclosed subcavities.

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 drawer type magnetic liquid damping shock absorber according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a first damping unit and a second damping unit according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a second permanent magnet according to an embodiment of the present invention.

Reference numerals:

the drawer type magnetic liquid damping shock absorber 100;

a first end cap 1; a first permanent magnet 2; a third permanent magnet 3; a second permanent magnet 4; a fourth permanent magnet 5; a first seal ring 61; a second seal ring 62; a second end cap 7; a magnetic liquid 8; the first connecting rod 91; a second connecting rod 92; a cushion pad 10; a first through-hole 111; a second through-hole 112; a body 12; a first elastic pad 131; a second elastic pad 132; and a raised structure 14.

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 exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A drawer type magnetic liquid damping shock absorber according to an embodiment of the present invention is described below with reference to fig. 1 to 3.

As shown in fig. 1, the drawer-type magnetic liquid damping vibration absorber 100 according to the embodiment of the present invention includes a housing, a first permanent magnet 2, a second permanent magnet 4, a third permanent magnet 3, a fourth permanent magnet 5, and a magnetic liquid 8.

The housing defines an enclosed cavity whose walls include a peripheral wall.

The first permanent magnet 2 and the second permanent magnet 4 are connected by a first connection rod 91. The third permanent magnet 3 and the fourth permanent magnet 5 are connected by a second connecting rod 92.

The third permanent magnet 3 is located between the first permanent magnet 2 and the second permanent magnet 4 in the first direction, and the second permanent magnet 4 is located between the third permanent magnet 3 and the fourth permanent magnet 5 in the first direction. For convenience of expression, the first direction is hereinafter referred to in the direction of arrow E shown in fig. 1. It should be noted that the left and right directions of the drawer-type magnetic liquid damping shock absorber 100 can refer to the directions indicated by the arrows E in fig. 1, and although the specific embodiment is not limited to the illustrated left and right directions, for the sake of simplifying the description, the left and right directions can be referred to as the directions shown in fig. 1 hereinafter.

That is, the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4, and the fourth permanent magnet 5 are disposed at intervals in the first direction in the closed cavity. The third permanent magnet 3 is located on the right side of the first permanent magnet 2, the second permanent magnet 4 is located on the right side of the third permanent magnet 3, and the fourth permanent magnet 5 is located on the right side of the second permanent magnet 4.

The first connecting rod 91 passes through the third permanent magnet 3, the second connecting rod 92 passes through the second permanent magnet 4, and the first permanent magnet 2 and the third permanent magnet 3, the third permanent magnet 3 and the second permanent magnet 4, and the second permanent magnet 4 and the fourth permanent magnet 5 are opposite in the same polarity in the first direction. Homopolar opposition means that the first permanent magnet 2 is opposite to the third permanent magnet 3, the third permanent magnet 3 is opposite to the second permanent magnet 4, and the second permanent magnet 4 is opposite to the magnetic pole with the same polarity as the fourth permanent magnet 5.

A gap is provided between the circumferential surface of each of the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3, and the fourth permanent magnet 5 and the circumferential wall surface of the housing. The magnetic liquid 8 is located in the gap. The magnetic liquid 8 is attracted in the gap by the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3, and the fourth permanent magnet 5.

In the embodiment of the present invention, the drawer-type magnetic liquid damping vibration absorber 100 is provided, wherein the first permanent magnet 2 and the second permanent magnet 4 are connected by the first connecting rod 91 to form a first vibration absorbing unit. The third permanent magnet 3 and the fourth permanent magnet 5 are connected by a second connecting rod 92 to form a second damping unit. The first vibration reduction unit and the second vibration reduction unit are used as mass blocks and are suspended in the closed cavity under the action of the magnetic liquid 8 to form the magnetic liquid damping vibration absorber based on the magnetic liquid second-order buoyancy principle.

When the object to be damped vibrates mechanically, the drawer-type magnetic liquid damping vibration absorber 100 moves relatively between the first vibration damping unit and the housing, between the second vibration damping unit and the housing, and between the first vibration damping unit and the second vibration damping unit. Squeezing, friction and viscous shearing are generated among the magnetic liquid 8, among the magnetic liquid 8 and the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3 and the fourth permanent magnet 5, and among the magnetic liquid 8 and the peripheral wall surface of the shell to consume energy, so that the effect of vibration reduction is achieved.

In the vibration damping process, the first vibration damping unit and the second vibration damping unit firstly generate passive relative motion due to external mechanical vibration. Since the first permanent magnet 2 is opposite to the third permanent magnet 3, the third permanent magnet 3 is opposite to the second permanent magnet 4, and the second permanent magnet 4 is opposite to the magnetic poles having the same polarity as the fourth permanent magnet 5, once any one of the first permanent magnet 2 and the third permanent magnet 3, the third permanent magnet 3 and the second permanent magnet 4, and the second permanent magnet 4 and the fourth permanent magnet 5 (for example, the first permanent magnet 2 and the third permanent magnet 3) is reduced in distance due to the relative movement of the first damping unit and the second damping unit in the first direction, repulsion occurs between two adjacent permanent magnets due to the principle that like poles repel each other, so that the first damping unit and the second damping unit are actively moved relative to each other due to the repulsion.

Wherein the motion direction of the active relative motion of each of the first and second damping units is opposite to the motion direction of the passive relative motion thereof. Moreover, when the first and second damping units produce a relative movement in the first direction (passive relative movement), either the distance of the first permanent magnet 2 from the third permanent magnet 3 is reduced and the distance of the second permanent magnet 4 from the fourth permanent magnet 5 is reduced, or the distance of the third permanent magnet 3 from the second permanent magnet 4 is reduced.

This passive relative movement and the active relative movement cooperate such that the frequency of the reciprocating movement of the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3 and the fourth permanent magnet 5 in the housing increases. And the increase of the times of reciprocating motion can increase the energy consumed by extrusion, friction and viscous shearing in the magnetic liquid 8, between the magnetic liquid 8 and the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3 and the fourth permanent magnet 5 and between the magnetic liquid 8 and the peripheral wall surface of the shell, so that the mechanical energy of vibration can be converted more quickly, the vibration amplitude of the permanent magnets can be reduced to the minimum more quickly, and the vibration reduction efficiency is effectively improved.

In some embodiments, as shown in fig. 1, the walls of the enclosed cavity defined by the housing further include a first sidewall surface and a second sidewall surface, the first sidewall surface and the second sidewall surface being opposite in the first direction, the perimeter wall surface being located between the first sidewall surface and the second sidewall surface in the first direction. The first side wall surface is opposed to the first permanent magnet 2 in the first direction, and the second side wall surface is opposed to the fourth permanent magnet 5 in the first direction. That is, the first sidewall is a left sidewall of the enclosed cavity and the second sidewall is a right sidewall of the enclosed cavity.

As an example, as shown in fig. 1, each of the first, third, second, and fourth

permanent magnets

2, 3, 4, and 5 has left and right sides, respectively, in the first direction. The left side and the right side of each of the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4 and the fourth permanent magnet 5 are different magnetic poles, that is, taking the first permanent magnet 2 as an example in fig. 1, the left side of the first permanent magnet 2 is an N pole, and the right side of the first permanent magnet 2 is an S pole. The right side surface (S-pole) of the first permanent magnet 2 is opposed to the left side surface (S-pole) of the third permanent magnet 3 in the first direction. The right side surface (N pole) of the third permanent magnet 3 is opposed to the left side surface (N pole) of the second permanent magnet 4 in the first direction. The right side surface (S-pole) of the second permanent magnet 4 is opposed to the left side surface (S-pole) of the fourth permanent magnet 5 in the first direction.

Preferably, the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4 and the fourth permanent magnet 5 are identical in shape, size and magnetic force. It is further preferred that the masses of the first, third, second and fourth

permanent magnets

2, 3, 4, 5 are equal and that the weight of the first damping unit is equal to the weight of the second damping unit, so that the inertia of the first damping unit is the same as the inertia of the second damping unit. The inertia of the first vibration damping unit is the same as the inertia of the second vibration damping unit, so that the motion characteristics of the first vibration damping unit and the second vibration damping unit are the same, and the design of the drawer-type magnetic liquid damping vibration absorber 100 is more reasonable.

In the case where the drawer-type magnetic liquid damping vibration absorber 100 is not subjected to external vibration, that is, the acting force between the first vibration damping unit and the second vibration damping unit is in a balanced state. The first vibration reduction unit and the second vibration reduction unit are both in balance positions, and the first vibration reduction unit, the second vibration reduction unit and the shell are relatively static. Preferably, the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4 and the fourth permanent magnet 5 are arranged at equal intervals in the first direction. That is, the distances between the first permanent magnet 2 and the third permanent magnet 3, between the third permanent magnet 3 and the second permanent magnet 4, and between the second permanent magnet 4 and the fourth permanent magnet 5 are equal.

In some embodiments, the gap between the circumferential surface of each of the first, second, third and fourth

permanent magnets

2, 4, 3, 5 and the circumferential wall surface of the housing is annular, i.e. the gap extends over the entire circumference of the closed cavity. Since the magnetic liquid 8 is located in the annular gap, that is, the magnetic liquid 8 is annular.

Optionally, the magnetic liquid 8 fills the annular gap to divide the closed cavity into a plurality of closed sub-cavities. That is, the magnetic liquid 8 between the first permanent magnet 2 and the peripheral wall surface of the housing seals the cavity between the first permanent magnet 2 and the first side wall surface to form a closed first sub-chamber. The magnetic liquid 8 between the peripheral wall surfaces of the shell of the fourth permanent magnet 5 seals the cavity between the fourth permanent magnet 5 and the second side wall surface to form a closed second sub-cavity. Thus, a closed third sub-chamber is formed between the first permanent magnet 2 and the fourth permanent magnet 5.

The acting force between the first vibration damping unit and the second vibration damping unit is in a balanced state, that is, when the first vibration damping unit and the second vibration damping unit are both located at a balanced position, the pressures of the first sub-cavity and the second sub-cavity are equal, that is, at the moment, the acting force of the gas in the first sub-cavity on the first vibration damping unit, the acting force of the gas in the second sub-cavity on the second vibration damping unit, and the repulsive force between the first vibration damping unit and the second vibration damping unit are balanced with each other, so that the first vibration damping unit and the second vibration damping unit are relatively static with the shell.

When the drawer-type magnetic liquid damping vibration absorber 100 is subjected to mechanical vibration, passive relative motion occurs between the first vibration attenuation unit, the second vibration attenuation unit and the shell. For example, when the first damping unit and the second damping unit are passively displaced to the left by the vibrating mechanical energy, the first permanent magnet 2 compresses the gas in the first sub-chamber, the pressure in the first sub-chamber increases, and the gas in the first sub-chamber generates a rightward restoring force on the first permanent magnet 2, so that the rate of leftward movement of the first permanent magnet 2 is reduced, or the first permanent magnet 2 starts to be displaced to the right by the restoring force of the gas in the first sub-chamber, at this time, if the second damping unit continues to be displaced to the left by the inertia, the distance between the first permanent magnet 2 and the third permanent magnet 3, and the distance between the second permanent magnet 4 and the fourth permanent magnet 5 are reduced. According to the repulsion of like poles, the first vibration reduction unit and the second vibration reduction unit can generate active relative motion generated by repulsive force. The second damping unit will start to move to the right under the action of the repulsive force and compress the gas in the second sub-chamber, and when the pressure in the second sub-chamber reaches a certain degree, the gas in the second sub-chamber will push the second damping unit to move to the left. The acting force of the gas in the first sub cavity on the first vibration reduction unit, the acting force of the gas in the second sub cavity on the second vibration reduction unit and the repulsive force between the first vibration reduction unit and the second vibration reduction unit are interacted, so that the first vibration reduction unit and the second vibration reduction unit continuously reciprocate in the shell until the mechanical energy of vibration is converted into heat energy, the first vibration reduction unit and the second vibration reduction unit return to the balance position, and the first vibration reduction unit, the second vibration reduction unit and the shell are relatively static, namely the vibration reduction process is completed. That is, the first and second damping units are able to generate a restoring force during vibration by compressing the gas in the first and second sub-chambers, which enables the first and second damping units to return to an initial equilibrium position.

In some embodiments, each of the closed cavity of the housing, the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4, and the fourth permanent magnet 5 is cylindrical and axially identical. The first direction is then axial to the closed cavity. That is, the axial direction of the enclosed cavity is shown in the direction indicated by arrow E in fig. 1.

As an example, the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4 and the fourth permanent magnet 5 are all axially magnetized. That is, the magnetizing directions of the first permanent magnet 2, the third permanent magnet 3, the second permanent magnet 4, and the fourth permanent magnet 5 are all along the first direction.

In some embodiments, the number of the first connecting rods 91 is one, the number of the second connecting rods 92 is plural, and the central axis of the first connecting rod 91 coincides with the central axis of the second permanent magnet 4. That is, both ends of the first connection rod 91 are connected to the middle portions of the first and second

permanent magnets

2 and 4, respectively. The extending direction of the first connection rod 91 is a first direction. The plurality of second connecting rods 92 surrounds the first connecting rod 91 in the circumferential direction of the closed cavity. Alternatively, the symmetrical center lines of the plurality of second connecting rods 92 coincide with the center axis of the first connecting rod 91. I.e. the centre line of symmetry of the second plurality of connecting rods 92 also coincides with the centre axis of the second permanent magnet 4. The purpose of this arrangement is to make the relative movement of the first and second damping units more stable and also to make the structure of the drawer-type magnetic liquid damping vibration absorber 100 more reasonable.

Preferably, the first and second connecting

rods

91 and 92 are equal in length.

Optionally, the first connecting rod 91, the second connecting rod 92 and the housing are all non-magnetically conductive materials.

As shown in fig. 1 and 3, the number of the second connecting rods 92 is optionally three, three second connecting rods 92 surround the first connecting rod 91 in the circumferential direction of the closed cavity, and the symmetrical center lines of the three second connecting rods coincide with the central axis of the first connecting rod.

In some embodiments, as shown in fig. 1, a first through hole 111 is provided on the third permanent magnet 3, and a second through hole 112 is provided on the second permanent magnet 4. The first through hole 111 penetrates the third permanent magnet 3 in the first direction, and the second through hole 112 penetrates the second permanent magnet 4 in the first direction. That is, the first through hole 111 axially penetrates the third permanent magnet 3 along the third permanent magnet 3, and the second through hole 112 axially penetrates the second permanent magnet 4 along the second permanent magnet 4. The first connection rod 91 is connected to the first permanent magnet 2 and the second permanent magnet 4 through the first through hole 111. The second connecting rod 92 passes through the second through hole 112 to be connected to the third permanent magnet 3 and the fourth permanent magnet 5.

As shown in fig. 1 and 3, alternatively, there are one first connecting rod 91 and three second connecting rods 92. Accordingly, there are one first through hole 111 and three second through holes 112. And, the three second through holes 112 correspond to the three second connecting rods 92 one to one. "one-to-one correspondence" means that the three second connecting rods 92 pass through the three second through holes 112, respectively.

Preferably, the diameter of the first through hole 111 is larger than that of the first connection rod 91 corresponding thereto, and the diameter of the second through hole 112 is larger than that of the second connection rod 92 corresponding thereto. "corresponding thereto" means the corresponding relationship of the first connecting rod 91 or the second connecting rod 92 and the first through hole 111 or the second through hole 112 through which it passes. Alternatively, the diameter of the first connection rod 91 is 1/3-2/3 of the diameter of the first through-hole 111. Optionally, the diameter of the second connecting rod 92 is 1/3-2/3 of the diameter of the second through hole 112. This is provided for preventing the first connecting rod 91 from rigidly colliding with the wall surface of the first through hole 111 and the second connecting rod 92 with the wall surface of the second through hole 112 during the relative movement of the first damping unit and the second damping unit.

In some embodiments, a first elastic pad 131 is disposed on at least one of the wall surface of the first through hole 111 and the first connection rod 91, and a second elastic pad 132 is disposed on at least one of the wall surface of the second through hole 112 and the second connection rod 92. The first and second

elastic pads

131 and 132 prevent the first and second damping units from rigidly colliding with the wall surfaces of the first and second through

holes

111 and 92 and 112 during the relative movement of the first and second damping units. As shown in fig. 1, a first elastic pad 131 is disposed on a wall surface of the first through hole 111, and a second elastic pad 132 is disposed on a wall surface of the second through hole 112. The first elastic pad 131 and the second elastic pad 132 may also have a buffering and vibration damping effect to some extent.

In some embodiments, the peripheral wall of the casing is provided with a protruding structure 14, and the protruding structure 14 is located between the second permanent magnet 4 and the third permanent magnet 3 in the first direction. Alternatively, as shown in fig. 1, the projection structure 14 is annular, and the projection structure 14 extends from the peripheral wall surface of the housing to the central axis of the closed cavity along the radial direction of the closed cavity, wherein the projection structure 14 has a first surface and a second surface opposite in the first direction, and the cushion pad 10 is provided on each of the first surface and the second surface. The first connecting rod 91 and the second connecting rod 92 both pass through the middle of the annular boss structure 14. The cushion pad 10 is provided on both sides of the projection structure 14. The cushion pad 10 may be a circular cushion pad 10 matching with the left and right sides of the protrusion structure 14, or may be a sheet-shaped cushion pad 10 as shown in fig. 1, and the sheet-shaped cushion pad 10 is provided with a through hole for the first connecting rod 91 and the second connecting rod 92 to pass through.

The purpose of providing the protruding structure 14 on the peripheral wall surface of the housing is to prevent the first and second damping units from colliding with the first or second side wall surface of the housing due to excessive displacement and causing damage. The cushion pad 10 is provided to avoid a rigid collision when the first and second damping units are in contact with the first and second surfaces of the protrusion structure 14. The cushion pad 10 can also provide a cushioning effect to some extent.

In some embodiments, the housing comprises a body 12, a first end cap 1 and a second end cap 7, the body 12 having a first opening and a second opening at two ends, the first end cap 1 being mounted at the first opening, the second end cap 7 being mounted at the second opening. I.e. the first end cap 1 covers the first opening and the second end cap 7 covers the second opening. Alternatively, the first and second end caps 1 and 7 are connected to the body 12 by fixing bolts.

In some embodiments, as shown in fig. 1, the drawer-type magnetic liquid damping vibration absorber 100 further comprises a sealing ring, which comprises a first sealing ring 61 and a second sealing ring 62, wherein the first sealing ring 61 is located at the connection position of the first end cap 1 and the body 12, and the second sealing ring 62 is located at the connection position of the second end cap 7 and the body 12. The first sealing ring 61 and the second sealing ring 62 play a sealing role, and the magnetic liquid 8 is prevented from leaking.

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

a first elastic pad 131 is mounted on a wall surface of the first through-hole 111, and a second elastic pad 132 is mounted on a wall surface of the second through-hole 112. The cushion pad 10 is symmetrically adhered to both sides of the projection structures 14. The first permanent magnet 2 and the second permanent magnet 4 are connected by a first connection rod 91. The third permanent magnet 3 and the fourth permanent magnet 5 are connected by a second connecting rod 92 and are fitted into the body 12. The attachment means may be adhesive. Then, the magnetic liquid 8 is injected into the gaps between the first permanent magnet 2, the second permanent magnet 4, the third permanent magnet 3, and the fourth permanent magnet 5 and the peripheral wall surface of the body 12. Finally, the first end cap 1 and the second end cap 7 are respectively installed at the first opening and the second opening of the body 12. The connection mode can be a thread fixed connection.

In the description of the present invention, it is to be understood that the terms "center", "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, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present 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," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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" or the like mean that a particular 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, 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 without departing from the scope of the present invention.

Claims

1. A drawer type magnetic liquid damping shock absorber, comprising:

the casing is used for limiting a closed cavity, the wall surfaces of the closed cavity comprise a peripheral wall surface, a first side wall surface and a second side wall surface, the first side wall surface and the second side wall surface are opposite in a first direction, and the peripheral wall surface is located between the first side wall surface and the second side wall surface in the first direction;

the first permanent magnet and the second permanent magnet are connected through a first connecting rod;

third permanent magnet and fourth permanent magnet, the third permanent magnet with the fourth permanent magnet passes through the second connective bar and links to each other, the third permanent magnet is in first direction is located first permanent magnet with between the second permanent magnet, the second permanent magnet is in first direction is located the third permanent magnet with between the fourth permanent magnet, first lateral wall face is in first direction with first permanent magnet is relative, the second lateral wall face is in first direction with the fourth permanent magnet is relative, first connective bar passes the third permanent magnet, the second connective bar passes the second permanent magnet, wherein first permanent magnet with the third permanent magnet, the third permanent magnet with the second permanent magnet, the second permanent magnet with the fourth permanent magnet is in first direction homopolar is relative, first permanent magnet, A gap is formed between the peripheral surface and the peripheral wall surface of each of the second permanent magnet, the third permanent magnet and the fourth permanent magnet; and

a magnetic liquid in the gap.

2. The drawer-type magnetic liquid damping vibration absorber of claim 1, wherein each of the enclosed cavity, the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet is cylindrical and axially identical, and the first direction is axial to the enclosed cavity.

3. The drawer-type magnetic liquid damping shock absorber according to claim 2, wherein the number of the first connecting rods is one, the number of the second connecting rods is plural, a central axis of the first connecting rod coincides with a central axis of the second permanent magnet, and the plural second connecting rods surround the first connecting rod in a circumferential direction of the closed cavity.

4. The drawer-type magnetic liquid damping shock absorber according to claim 3, wherein a center line of symmetry of the plurality of second connecting rods coincides with a center axis of the first connecting rod.

5. The drawer-type magnetic liquid damping vibration absorber as recited in claim 2, wherein a first through hole is provided on the third permanent magnet, a second through hole is provided on the second permanent magnet, the first connecting rod passes through the first through hole, and the second connecting rod passes through the second through hole;

the diameter of the first through hole is larger than that of the first connecting rod corresponding to the first through hole, and the diameter of the second through hole is larger than that of the second connecting rod corresponding to the second through hole.

6. The drawer-type magnetic liquid damping shock absorber according to claim 5, wherein a first elastic pad is provided on at least one of a wall surface of the first through hole and the first connection rod, and a second elastic pad is provided on at least one of a wall surface of the second through hole and the second connection rod.

7. The drawer-type magnetic liquid damping vibration absorber as recited in claim 2, wherein a projection structure is provided on the peripheral wall surface, the projection structure being located between the second permanent magnet and the third permanent magnet in the first direction.

8. The drawer-type magnetic liquid damping shock absorber according to claim 7, wherein the protrusion structure is annular, the protrusion structure extending from the peripheral wall surface to a central axis of the closed cavity in a radial direction of the closed cavity, wherein the protrusion structure has a first surface and a second surface opposite in the first direction, and a cushion is provided on each of the first surface and the second surface.

9. The drawer-type magnetic liquid damping shock absorber according to claim 1, wherein the first connecting rod, the second connecting rod and the housing are all non-magnetically conductive materials.

10. The drawer-type magnetic liquid damping shock absorber of claim 2 wherein the first, second, third and fourth permanent magnets are all axially charged.

11. The drawer-type magnetic liquid damping shock absorber according to any one of claims 1 to 10, wherein the gap is annular.