CN114439876A - Friction electrification electromagnetic liquid damping shock absorber - Google Patents

Abstract

The invention discloses a friction electrification electromagnetic liquid damping shock absorber, which comprises: a housing; the friction part is positioned in the shell and comprises an upper friction part and a lower friction part, the upper friction part and the lower friction part are made of different materials, and the upper friction part, the lower friction part and the side wall of the shell form a vibration reduction cavity; the working unit is arranged in the vibration damping cavity and comprises a permanent magnet and an elastic rope used for connecting the permanent magnet and the side wall of the shell; the magnetic liquid is respectively positioned on the side surfaces of the permanent magnets facing the upper friction part and the lower friction part; a conductive portion including a conductive wire for electrically connecting the upper friction portion and the lower friction portion; the electricity utilization units are connected in series between the upper friction part and the lower friction part to form a closed loop. Therefore, the vibration mechanical energy is converted into usable electric energy, the conversion consumption of the vibration mechanical energy is accelerated, and the damping vibration attenuation efficiency of the friction electrification electromagnetic liquid damping vibration absorber is improved.

Description

A friction-generating electromagnetic liquid damping shock absorber

technical field

The invention relates to the field of mechanical engineering vibration control, in particular to a friction-generating electromagnetic liquid damping shock absorber.

Background technique

As a new type of nano-functional material, magnetic liquid is a stable colloidal solution formed by coating the surface of nano-scale magnetic particles with surfactant and dispersing it in a base carrier liquid. Due to its unique composition and structure, magnetic liquid has both fluidity and magnetism, and can be used in many fields such as shock absorbers, sensors, and seals. Magnetic liquid damping shock absorber works based on the second-order buoyancy principle of magnetic liquid. It has the advantages of long life, no external energy supply, simple structure, small size, light weight and high reliability. It is suitable for longer parts in spacecraft ( Such as satellite dishes, solar panels) low frequency, small amplitude, local vibration reduction of small acceleration.

The working unit in the existing magnetic liquid damping shock absorber has poor suspension stability, low damping and vibration reduction efficiency, and cannot convert the mechanical energy of vibration into usable energy.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a friction-generating electromagnetic liquid damping shock absorber, which has excellent damping and vibration-absorbing effects and can convert vibration mechanical energy into usable electrical energy.

According to the friction-generating electromagnetic liquid damping shock absorber according to the embodiment of the present invention, the friction-generating electromagnetic liquid damping shock absorber includes: a casing, a friction part, a working unit, a magnetic liquid, a conducting part and an electricity consumption unit. The friction parts are arranged at both ends of the casing, and the friction parts include an upper friction part and a lower friction part, the materials of the upper friction part and the lower friction part are different, and the upper friction part and the lower friction part are made of different materials. The friction part and the casing form a vibration damping cavity; the working unit is arranged in the vibration damping cavity, and the working unit includes a permanent magnet and an elastic cord for connecting the permanent magnet and the inner wall of the casing; the The magnetic liquid is arranged between the working unit and the friction part; the conductive part includes a wire, and the wire is connected with the friction part; the electricity consumption unit is connected with the upper friction part and the friction part through the wire. The lower friction parts are connected to form a closed circuit.

When the frictional electromagnetic liquid damping shock absorber is affected by external vibration, the working unit is displaced in the vibration damping cavity, and under the action of the elastic rope, the working unit reciprocates, so The magnetic liquid generates friction with the upper friction part and the lower friction part at the same time. According to the triboelectric effect, at this time, the upper friction part and the lower friction part generate opposite electric charges, and the upper friction part and the lower friction part generate opposite charges. The friction part, the lower friction part, the electrode layer, the wire and the power consumption unit are connected to form a closed loop, and the electric charge moves in the closed loop to finally form a current. Electricity unit storage or utilization. In this way, the conversion of vibrational mechanical energy into usable electrical energy is realized, and the conversion and consumption of vibrational mechanical energy is accelerated, the damping and vibration reduction efficiency of the frictional electromagnetic liquid damping shock absorber is improved, and the frictional Practicality of electromagnetic liquid damping shock absorbers.

Further, a side surface of the upper friction portion facing the working unit and a side surface of the lower friction portion facing the working unit are both formed with surface textures.

Further, both the upper friction part and the lower friction part are made of polymer material.

Further, the thicknesses of the upper friction part and the lower friction part are both 200um-500um.

Further, the permanent magnets are Halbach array permanent magnets.

Further, the elastic cord includes a first elastic cord and a second elastic cord, and the first elastic cord and the second elastic cord are symmetrically arranged on both sides of the permanent magnet; The ends are respectively fixedly connected to the permanent magnet and the inner wall of the casing, and the two ends of the second elastic rope are respectively fixedly connected to the permanent magnet and the inner wall of the casing.

Further, the conductive part further includes an electrode layer connected with the wire, the electrode layer is respectively arranged on the side of the upper friction part away from the working unit and the side of the lower friction part away from the working unit .

Further, the housing includes a main body and end caps fixed at both ends of the main body, and the end caps fixed at both ends of the main body are disposed on the outer surface of the electrode layer away from the friction part.

Further, the casing is made of electrical insulating material.

Further, the friction-induced electromagnetic liquid damping shock absorber further includes a fixing member, and the fixing member is used for fixedly connecting the main body and the end cover.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic cross-sectional structure diagram of a friction-induced electromagnetic liquid damping shock absorber according to an embodiment of the present invention;

2 is a schematic structural diagram of a housing according to an embodiment of the present invention;

Fig. 3 is the sectional view along II-II in Fig. 1;

4 is a schematic diagram of a rectangular surface texture structure of a friction portion according to an embodiment of the present invention;

5 is a schematic diagram of a polygonal surface texture structure of a friction portion according to an embodiment of the present invention;

6 is a schematic diagram of a circular surface texture structure of a friction portion according to an embodiment of the present invention;

7 is a schematic diagram of a triangular surface texture structure of a friction portion according to an embodiment of the present invention.

Reference number:

Friction-generating electromagnetic liquid damping shock absorber 100,

Housing 10, main body 11, end cover 12, opening 13, vibration damping cavity 14,

Friction part 20, upper friction part 21, lower friction part 22,

Working unit 30, permanent magnet 31, elastic cord 32, first elastic cord 321, second elastic cord 322,

Magnetic Liquid 40,

Conductive part 50, wire 51, electrode layer 52,

power unit 60,

Fixture 70 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection or indirect connection through an intermediate medium, may be internal communication between two elements or an interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Referring to FIGS. 1 to 7 , a friction-induced electromagnetic liquid damping shock absorber 100 is provided according to an embodiment of the present invention. The friction-induced electromagnetic liquid damping shock absorber 100 includes: a casing 10 , a friction part 20 , and a working unit 30 . The magnetic liquid 40 , the conductive part 50 and the power consumption unit 60 .

An accommodating cavity is formed in the casing 10 , and the friction part 20 , the working unit 30 and the magnetic liquid 40 are all located in the accommodating cavity. The casing 10 is made of electrically insulating and non-magnetic materials, so that the casing 10 can prevent the casing 10 from affecting the normal movement of the working unit 30 in the vibration damping cavity 14, and the casing 10 can isolate the conduction of current and prevent leakage.

The friction part 20 is arranged in the casing 10, and the friction part 20 includes an upper friction part 21 and a lower friction part 22. The upper friction part 21, the lower friction part 22 and the casing 10 together define the vibration damping cavity 14. For example, as shown in FIG. The friction part 21 is adjacent to the upper wall surface of the casing 10, the lower friction part 22 is adjacent to the lower wall surface of the casing 10, and the upper friction part 21 and the lower friction part 22 completely occupy the upper wall surface and the lower wall surface of the casing 10. Therefore, the upper friction part 21 , the lower friction part 22 and the side wall surface of the casing 10 form a vibration damping cavity 14 .

Further, the upper friction part 21 and the lower friction part 22 are made of different materials, so that after being rubbed, the electric charges of the upper friction part 21 and the lower friction part 22 are opposite. The friction part 20 is made of polymer materials, such as PET and Kapton. The polymer material is more likely to generate charges after friction, and the thickness of the friction part 20 is between 200um and 500um, which can ensure that the friction part 20 is rubbed by the magnetic liquid 40 Afterwards, charges are normally generated, and the generated charges can be normally transmitted to the conductive portion 50, and the friction portion 20 does not occupy too much space, and the layout is reasonable.

Further, a surface texture is formed on the side of the upper friction portion 21 facing the working unit 30 , and a surface texture is formed on the side of the lower friction portion 22 facing the working unit 30 , as shown in FIGS. 4 to 7 , the surface texture may have Various styles, for example, the surface texture can be at least one of parallel grooves, thread grooves, circular texture, elliptical texture, triangular texture, and polygonal texture, of course, the surface texture can also be other structures The form is not limited here.

The magnetic liquid 40 is located on the side of the permanent magnet 31 facing the upper friction part 21 and the lower friction part 22, respectively. The surface texture can increase the contact area between the upper friction part 21 or the lower friction part 22 and the magnetic liquid 40, and change the shearing force of the magnetic liquid 40. The shear rate increases, the friction between solid and liquid is increased, and the vibration reduction performance of the device is improved at the same time as the efficiency of triboelectric charging of the device.

The working unit 30 is arranged between the upper friction part 21 and the lower friction part 22 . The working unit 30 is a composite magnet composed of a plurality of permanent magnet blocks. The permanent magnet blocks are made of permanent magnet materials, such as NdFeB. Compared with a single magnet structure, the composite structure in which multiple permanent magnet blocks are connected and combined will generate a larger magnetic field gradient, which will increase the suspension force of the magnetic liquid 40 on the working unit 30, thereby improving the suspension stability of the working unit 30. In turn, the vibration damping performance is improved and the service life is prolonged. It should be noted that, although the composite structure using multiple permanent magnet blocks produces a larger magnetic field gradient than a single magnet structure, which improves the stability of the friction-induced electromagnetic liquid damping shock absorber 100, considering the conditions such as volume and quality The number of permanent magnet blocks should not be too large. Generally, according to vibration reduction requirements, the working unit 30 will select 2 to 6 permanent magnet blocks to form a composite structure. Further, the permanent magnet blocks in the working unit 30 can be arranged as a Halbeck array, so that the strongest magnetic field can be generated with the least amount of magnets, and the stability of the friction-induced electromagnetic liquid damping shock absorber 100 can be further improved.

There is a gap between the working unit 30 and the friction part 20, and the width of the gap is 1-3 mm, which can ensure the relative movement of the working unit 30 and the friction part 20. The ester-based magnetic liquid 40 is adsorbed on the surface of the permanent magnet 31 . When the working unit 30 and the friction part 20 move relatively, friction is generated between the magnetic liquid 40 and the friction part 20 .

Although based on the second-order buoyancy principle of the magnetic liquid, the magnetic liquid 40 can suspend the working unit 30 immersed in it with a larger specific gravity than itself. When suspended at rest, the working unit 30 is basically in the center of the liquid. When receiving external vibration energy, it will Causes the working unit 30 to fluctuate arbitrarily, and finally the working unit 30 returns to the equilibrium position in the form of a recovery motion due to the pressure difference caused by the asymmetry of the magnetic liquid 40, that is, returns to the center of the liquid, but because the working unit 30 is composed of multiple permanent The combined magnet blocks have a relatively large mass. If only the force provided by the magnetic liquid 40 is used, it is difficult for the working unit 30 to complete the reciprocating motion. One end of the elastic cord 32 is fixed on the inner wall of the housing 10 , and the other end of the elastic cord 32 is fixedly connected with the permanent magnet 31 . The displacement of the working unit 30 under the influence of the vibration drives the elastic cord 32 to deform the elastic cord 32 . The elastic rope 32 is generally made of non-magnetically conductive and elastically deformable materials, such as spring steel, etc., and the elastic rope 32 includes a first elastic rope 321 and a second elastic rope 322, and the first elastic rope 321 and the second elastic rope 322 are symmetrical It is arranged at both ends of the permanent magnet 31, that is, the two ends of the first elastic rope 321 are respectively fixedly connected with the permanent magnet 31 and the inner wall of the casing 10, and the two ends of the second elastic rope 322 are respectively connected with the permanent magnet 31 and the inner wall. The inner wall of the casing 10 is fixedly connected. In addition, the first elastic cord 321 and the second elastic cord 322 can also be in the same horizontal plane, which ensures that the working unit 30 can reciprocate smoothly.

The conductive portion 50 includes wires 51 and electrode layers 52 . The electrode layer 52 is provided on the outer surface of the upper friction part 21 or the lower friction part 22 away from the working unit 30 , the electrode layer 52 is connected with the friction part 20 , and the wire 51 is connected with the electrode layer 52 and the power consumption unit 60 , that is, the power consumption The unit 60 is connected in series between the upper friction part 21 and the lower friction part 22 , so that the upper friction part 21 , the lower friction part 22 , the electrode layer 52 , the wire 51 and the power unit 60 form a closed loop. The electrode layer 52 is generally made of a material with good conductivity, such as copper or the like.

The power-consuming unit 60 may be electronic components such as capacitors and diodes, which can store or utilize electrical energy in a closed loop.

As shown in FIG. 1 and FIG. 2 , in the friction-induced electromagnetic liquid damping shock absorber 100 provided by the embodiment of the present invention, the housing 10 further includes a main body 11 and an end cover 12 . Openings 13 are provided at both ends of the main body 11 , and the end caps 12 are fixed on the openings 13 and cover the openings 13 . The main body 11 and the end cap 12 are fixed by the fixing member 70 , and the main body 11 and the end cap 12 can be disassembled. The fixing member 70 is a fixing bolt, which is convenient for installation and removal.

When assembling, the main body 11 and the end cover 12 are disassembled first, so that the friction part 20 , the working unit 30 , etc. can be assembled into the housing 10 easily. During the assembly process, the friction part 20 is arranged on the opening 13 and completely covers the opening 13, and the surface of the friction part 20 faces the end face of the opening 13, so that the friction part 20 and the main body 11 together form the vibration damping cavity 14, and the working unit 30 is arranged in the damping chamber 14. The vibration chamber 14 is connected to the inner peripheral wall of the main body 11 through the elastic cord 32 ; The end cover 12 is fixedly connected to the main body 11 through the fixing member 70 to protect and fix the friction part 20 and the electrode layer 52 to ensure the stability of the overall structure of the friction-induced electromagnetic liquid damping shock absorber 100 . Since the working unit 30 includes the permanent magnet 31 and the frictional electromagnetic liquid damping shock absorber 100 generates current during use, the main body 11 and the end cover 12 are electrically insulating and non-magnetic materials such as plexiglass.

During use, the friction-induced electromagnetic liquid damping shock absorber 100 is affected by external vibration, and the working unit 30 is displaced in the vibration damping cavity 14. Under the action of the elastic rope 32, the working unit 30 reciprocates, and the magnetic liquid 40 At the same time, friction is generated with the upper friction part 21 and the lower friction part 22. According to the triboelectric effect, the upper friction part 21 and the lower friction part 22 generate opposite electric charges, and the upper friction part 21, the lower friction part 22, The electrode layer 52 , the wire 51 and the power-consuming unit 60 are connected to form a closed loop. The electric charge moves in the closed loop and finally forms a current. The current passes through the power-consuming unit 60 and is stored or utilized by the power-consuming unit 60 . In this way, the conversion of vibrational mechanical energy into usable electrical energy is realized, the conversion and consumption of vibrational mechanical energy is accelerated, the damping and vibration reduction efficiency of the friction-induced electromagnetic liquid damping shock absorber 100 is improved, and the friction-induced electromagnetic liquid is also expanded. Practicality of damping shock absorber 100 .

Further, the surfaces of the upper friction part 21 and the lower friction part 22 adjacent to the working unit 30 are provided with surface texture, the surface texture can increase the contact area between the friction part 20 and the magnetic liquid 40 and change the shearing force of the magnetic liquid 40 . The speed increases, the friction between solid and liquid is increased, the conversion and consumption of vibration mechanical energy is further accelerated, the friction electrification efficiency is improved, and the vibration reduction efficiency of the friction electrification electromagnetic liquid damping shock absorber 100 is also improved.

In the description of this specification, description with reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means specific features, structures, materials, or characteristics described in connection with the embodiments or examples. Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily 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.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A triboelectric, electromagnetic, liquid damping shock absorber, comprising:

a housing;

the friction part is positioned in the shell and comprises an upper friction part and a lower friction part, the upper friction part and the lower friction part are made of different materials, and the upper friction part, the lower friction part and the side wall of the shell form a vibration reduction cavity;

the working unit is arranged in the vibration reduction cavity and comprises a permanent magnet and an elastic rope used for connecting the permanent magnet and the side wall of the shell;

magnetic liquid, the said magnetic liquid locates at the side of the said permanent magnet towards said upper friction part and said lower friction part separately;

a conductive portion including a conductive wire for electrically connecting the upper friction portion and the lower friction portion;

and the power utilization unit is connected between the upper friction part and the lower friction part in series to form a closed loop.

2. The triboelectric, electromagnetic, liquid damping shock absorber according to claim 1, wherein the side of said upper friction portion facing said working unit and the side of said lower friction portion facing said working unit are each formed with a surface texture.

3. The triboelectric magnetic liquid damping shock absorber according to claim 2, characterized in that said upper friction portion and said lower friction portion are both composed of a polymer material.

4. The triboelectric magnetic liquid damping shock absorber according to claim 1, wherein the thickness of the upper friction portion and the lower friction portion is 200-500 um each.

5. The triboelectric magnetic liquid damping vibration absorber according to claim 1, wherein said permanent magnet is a halbach array permanent magnet.

6. The triboelectric magnetic liquid damping vibration absorber of claim 1, wherein said bungee cord comprises a first bungee cord and a second bungee cord, said first bungee cord and said second bungee cord being symmetrically disposed on either side of said permanent magnet; the two ends of the first elastic rope are fixedly connected with the permanent magnet and the inner wall of the shell respectively, and the two ends of the second elastic rope are fixedly connected with the permanent magnet and the inner wall of the shell respectively.

7. The triboelectric magnetic liquid damping vibration absorber of claim 1, wherein said conductive portion further comprises electrode layers connected to said wires, said electrode layers being disposed on a side of said upper friction portion remote from said working unit and a side of said lower friction portion remote from said working unit, respectively.

8. The shock absorber according to any one of claims 1 to 7, wherein the housing comprises a main body and end caps fixed to both ends of the main body, and the end caps fixed to both ends of the main body are disposed on outer surfaces of the electrode layers away from the friction portion.

9. The triboelectric magnetic liquid damping absorber according to claim 8, wherein said housing is of an electrically insulating material.

10. The triboelectric magnetic liquid damping shock absorber according to claim 8, further comprising a fixture for fixedly connecting the body and end cap.

Images