CN117717225A - A variable stiffness energy harvesting backpack system based on static resistance damping - Google Patents
A variable stiffness energy harvesting backpack system based on static resistance damping Download PDFInfo
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Abstract
本公开提出一种基于静电阻尼作用的变刚度能量收集背包系统，包括背包本体、具有中空层的背带、弹性带以及设置于背包本体和背带之间的自供电变刚度装置；弹性带的两端分别固接于背带的中空层内和背包本体之间；自供电变刚度装置包括摩擦供电单元、静电吸附单元和电路管理单元，摩擦供电单元、静电吸附单元的定子与背带共同构成定子部分，摩擦供电单元、静电吸附单元的动子与背包本体共同构成动子部分；摩擦供电单元基于摩擦生电原理将弹性带存储的动能转换为电能驱动静电吸附单元，通过电路管理单元调节后提供电能给静电吸附单元，静电吸附单元基于静电吸附作用改变本背包系统的弹性刚度，通过增加背包本体与背带间的滑动阻尼力实现静电阻尼作用。
The present disclosure proposes a variable stiffness energy collection backpack system based on electrostatic damping, which includes a backpack body, a strap with a hollow layer, an elastic strap, and a self-powered variable stiffness device disposed between the backpack body and the strap; both ends of the elastic strap They are respectively fixed in the hollow layer of the strap and between the backpack body; the self-powered variable stiffness device includes a friction power supply unit, an electrostatic adsorption unit and a circuit management unit. The stator of the friction power supply unit, the electrostatic adsorption unit and the strap together constitute the stator part. The power supply unit, the mover of the electrostatic adsorption unit and the backpack body together form the mover part; the friction power supply unit converts the kinetic energy stored in the elastic band into electrical energy based on the principle of triboelectricity to drive the electrostatic adsorption unit, and provides electrical energy to the static electricity after being adjusted by the circuit management unit The adsorption unit, the electrostatic adsorption unit changes the elastic stiffness of the backpack system based on electrostatic adsorption, and achieves electrostatic damping by increasing the sliding damping force between the backpack body and the straps.
Description
Technical Field
The disclosure relates to the technical field of luggage application, in particular to a variable stiffness energy collection backpack system based on an electrostatic damping effect.
Background
The knapsack, as a portable storing device, brings convenience in people's daily life. However, conventional backpacks have a common problem in that the backpacks can be coupled to float along with the walking or running movements of the human body, which can bring additional idle work, consume human energy and accumulate backpack fatigue. Meanwhile, continuous energy supply of portable wearable equipment is also a technical challenge in field activities such as scientific investigation, hiking, military training, fire rescue and the like. Conventional power sources, such as batteries, suffer from inherent disadvantages such as limited capacity and life, need for frequent recharging and charging sources, difficulty in recycling, etc. Therefore, a suspension mechanism such as an elastic belt system which can decouple the coupling motion of the backpack and the human body is explored, so that the suspension mechanism and the elastic belt system can slide relatively to reduce the vibration amplitude of the load, thereby achieving the effects of vibration reduction and labor saving; meanwhile, the electric energy collection module is driven by the relative motion between the backpack and the human body to collect the motion energy of the human body, so that the electric energy collection device has great practical application and scientific research significance.
The human body movement energy is a sustainable and green energy source, such as walking, running, knee bending and the like, and is used as an energy source, and the electric energy collection module is utilized to convert mechanical energy into electric energy to supply energy to electronic devices, so that a self-powered power supply system is constructed, and the self-powered power supply system has important significance for continuous supply of outdoor power supply. Currently, research on a nano friction generator (Triboelectric nanogenerator, abbreviated as TENG) technology is on the rise, which utilizes friction power generation and electrostatic induction coupling effect to collect mechanical energy, is very suitable for collecting low-frequency energy such as human motion energy, and has higher energy collecting efficiency than electromagnetic, piezoelectric and other technologies. On the other hand, electrostatic adsorption is a common physical phenomenon, and utilizes the attraction effect of positive and negative charges in a high-voltage electrostatic field to realize the adsorption and motion retardation effect on objects; TENG can naturally output a high-voltage electrostatic field, and electrostatic adsorption can be realized based on the TENG, so that an electrostatic damping effect is generated. Therefore, if the human body movement energy collection can be realized based on the TENG technology to generate continuous electric energy, the high-voltage electrostatic field can be utilized to generate an electrostatic damping effect for adjusting the relative movement between the knapsack and the human body, so that the vibration reduction and labor saving to the greatest extent under different conditions of step frequency, pace speed, stride and the like are realized.
Typical knapsack system of current integration TENG technique, pages 11317-11324 of volume 7 and 12 of the journal ACS Nano in 2013 [1] A backpack system with diamond grid type power generation units placed on the shoulder is reported, wherein the backpack system collects human movement mechanical energy and a multi-layer diamond grid type structure by using TENG technology to increase the power generation area so as to improve the output electric energy; pages 1488-1493 of the international journal Journal ofMaterials Chemistry C, volume 5, phase 6 [2] There is reported a backpack system placed at the waist to collect mechanical energy such as walking, running and bending of the waist of a human body, which utilizes a surface treatment technique to manufacture a friction material having an irregular structure on the surface to increase the area of TENG contact friction and thereby increase output electric energy; in addition, the subject group of the applicant is pages 2611-2623, volume 15, phase 2 of the international journal ACS Nano, 2021 [3] A hanging type energy collecting knapsack system based on TENG technology is reported, which utilizes the hanging system to realize vibration reduction and labor saving and TENG technology to collect human body movement energy, and simultaneously applies for a knapsack system national invention patent (ZL 201910573414.6) related to the TENG technology [4] . However, these several TENG technology based backpack systems suffer from the following disadvantages: firstly, the two knapsack technologies have no vibration reduction and labor saving functions and no fatigue reduction effects; second, the former two backpack structures are not backpack systems in practical sense, they simply construct a power generation module based on TENG technology and attach it to a practical backpack, so the integration is not enough and the practicability is not strong. Third, the applicant's task group has been a prior backpack system that, while achieving vibration reduction and effort saving and human movement energy harvesting, has a bullet in its suspension systemThe sex body rigidity adjusting mechanism is difficult to operate, the linear slide rail mechanism is complex in design and low in practicality, and the whole structure is heavy due to excessive use of materials such as an acrylic plate, so that the wearing burden is increased; meanwhile, the primary backpack system does not integrate an electrostatic adsorption structure, so that the electrostatic adsorption structure has no electrostatic damping effect, and the relative movement between the backpack and a human body cannot be finely regulated.
The prior art comprises the following steps:
[1]Weiqing Yang,Jun Chen,Guang Zhu,Jin Yang,Peng Bai,Yuanjie Su,Qingsheng Jing,Xia Cao,Zhong Lin Wang.Harvesting Energy from the Natural Vibration of Human Walking[J].ACS Nano,2013,7(12):11317-11324.https://doi.org/10.1021/nn405175z
[2]Arunkumar Chandrasekhar,Nagamalleswara Rao Alluri,Venkateswaran Vivekananthan,Yuvasree Purusothaman,Sang-Jae Kim.A sustainable freestanding biomechanical energy harvesting smart backpack as a portable-wearable power source[J].Journal of Materials Chemistry C,2017,5(6):1488-1493.https://doi.org/10.1039/c6tc05282g
[3]Ze Yang,Yiyong Yang,Fan Liu,Zhaozheng Wang,Yinbo Li,Jiahao Qiu,Xuan Xiao,Zhiwei Li,Yijia Lu,Linhong Ji,Zhong Lin Wang,Jia Cheng.Power backpack for energy harvesting and reduced load impact[J].ACS Nano,2021,15(2):2611-2623.https://doi.org/10.1021/acsnano.0c07498
[4] cheng Jia, yang Ze, ji Lingong, lu Yijia, li Yinbo A friction-based energy harvesting and offloading backpack [ P ]. Beijing, inc.: CN110269379B,2021-06-04.Https:// kns. Cnki.net/kcms 2/arc/absstract = kxaUMs6x7-4I2jr5WtdXti3zQ F92xu0jPYZ-6FemR80Tp IUx9Y4 vqcnVsRAjjxFmz1 ks88 vUfurkurukurdukqwr6aLd9 xBRyrm & uniplatform = NZKPT =NZKPT
Disclosure of Invention
The present disclosure is directed to solving at least one of the technical problems existing in the prior art.
Therefore, the variable-rigidity energy collection backpack system based on the electrostatic damping effect can realize lighter vibration reduction and labor saving, and can realize rigidity adjustment of the backpack vibration reduction system based on the electrostatic damping technology.
In order to achieve the above purpose, the present disclosure adopts the following technical scheme:
the utility model provides a become rigidity energy collection knapsack system based on static damping effect, including knapsack body, have the braces of hollow layer, rigid coupling in the elastic webbing of the hollow layer of braces, and set up in the self-power becomes rigidity device between knapsack body and the braces;
one end of the elastic belt is fixedly connected in the hollow layer of the braces, and the other end of the elastic belt is fixedly connected with the backpack body;
the self-powered rigidity-changing device comprises a friction power supply unit, an electrostatic adsorption unit and a circuit management unit, wherein the friction power supply unit and the electrostatic adsorption unit are respectively provided with a stator and a rotor, the stators of the friction power supply unit and the electrostatic adsorption unit are connected through a first connecting piece and form a stator part of the rigidity-changing energy collection backpack system together with the braces, and the rotors of the friction power supply unit and the electrostatic adsorption unit are connected through a second connecting piece and form a rotor part of the rigidity-changing energy collection backpack system together with the backpack body; the friction power supply unit converts kinetic energy stored by the elastic belt into electric energy based on a friction electricity generation principle to drive the electrostatic adsorption unit, the electric energy is provided for the electrostatic adsorption unit after being regulated by the circuit management unit, the elastic rigidity of the variable rigidity energy collection backpack system is changed by the electrostatic adsorption unit based on the electrostatic adsorption effect, and the electrostatic damping effect is realized by increasing the sliding damping force between the backpack body and the braces.
In some embodiments, the harness is made of inelastic material, a majority of the elastic strap is located within the hollow layer of the harness, and a minority of the elastic strap is located outside the harness.
In some embodiments, the initial elastic stiffness of the variable stiffness energy harvesting backpack system is positively correlated with the length of the elastic strap.
In some embodiments, the friction power supply unit is arranged closer to the braces than the electrostatic adsorption unit, and adopts a symmetrical independent friction layer type nano friction power generator structure, and comprises a rotor and stators symmetrically arranged at two sides of the rotor, wherein the rotor of the friction power supply unit comprises a driving plate, and two sides of the driving plate facing the stators are respectively and fixedly provided with a friction layer II; the stator of friction power supply unit includes first electrode base plate, first electrode and friction layer one of stacking in proper order, just friction layer one compare first electrode base plate is close to friction power supply unit's active cell sets up, the size of first electrode base plate should cover the motion range of drive plate.
In some embodiments, the first electrodes disposed on the first electrode substrate are arranged in a grid form, and two sides of the driving plate facing the stator are provided with identical grid-type protruding structures, and the protruding structures are consistent with the grid-type arrangement mode of the first electrodes.
In some embodiments, the first electrode substrate, the first electrode and the friction layer located at two sides of the driving board are integrally fixed on one surface of the strap facing the backpack body through the first connecting piece; the driving plate and the second friction layer are connected with the active cell in the electrostatic adsorption unit together through the second connecting piece and are connected with the backpack body.
In some embodiments, the first connecting piece and the second connecting piece are strip-shaped plates with hollow structures, the first connecting piece is connected between the rotor of the friction power supply unit and the upper side and the lower side of the rotor of the electrostatic adsorption unit, and the second connecting piece is connected between the rotor of the friction power supply unit and the left side and the right side of the rotor of the electrostatic adsorption unit.
In some embodiments, the electrostatic adsorption unit is disposed closer to the backpack body than the friction power supply unit, the electrostatic adsorption unit includes a buffer layer, a second electrode substrate, a second electrode, a first dielectric layer, a second dielectric layer, a third electrode, and a third electrode substrate sequentially disposed along a direction from the strap to the backpack body, the buffer layer, the second electrode substrate, the second electrode, and the first dielectric layer constitute a stator of the electrostatic adsorption unit, the second dielectric layer, the third electrode, and the third electrode substrate constitute a mover of the electrostatic adsorption unit, the first dielectric layer is sized to completely cover the second electrode, the second dielectric layer is sized to completely cover the third electrode, and the second electrode is sized to completely cover a range of motion of the third electrode.
In some embodiments, the circuit management unit is provided with two, the friction power supply unit has two ac output ends, a first circuit management unit is connected between the first ac output end of the friction power supply unit and one of the second electrode and the third electrode of the electrostatic adsorption unit, a second circuit management unit is connected between the second ac output end of the friction power supply unit and the other of the second electrode and the third electrode of the electrostatic adsorption unit, and the circuit management unit includes a boost rectifying circuit and a switch that are connected.
In some embodiments, the boost rectifying circuit comprises a main circuit formed by connecting at least two diodes with the same number of capacitors, and a zener diode connected in parallel between an input end and an output end of the main circuit; each diode is connected in series from head to tail in turn, and each capacitor is connected in series between the corresponding two diodes in a staggered manner.
The method has the following beneficial effects:
the invention innovatively provides a variable-rigidity energy collection knapsack system based on an electrostatic damping effect, and the energy collection and overall rigidity adjustment functions of the knapsack system are realized by adopting an electrostatic damping technology. The knapsack adopts a separated assembly design, so that the knapsack body and the knapsack structure can be separated and carried, and the main function realization module comprises a friction power generation unit and an electrostatic adsorption unit, so that the knapsack can lighten the impact of the knapsack heavy object on a human body, and the cushioning effect is realized. Meanwhile, the relative sliding between the human body and the knapsack is utilized to drive the friction power generation unit to collect the motion energy of the human body. The electric energy generated by the friction power supply unit is transmitted to the electrostatic adsorption unit through the circuit management unit, the electrostatic adsorption unit receives the electric energy and then generates electrostatic adsorption force, so that the vibration amplitude generated by the backpack body is reduced, and the overall rigidity adjusting function of the backpack system is realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a variable stiffness energy harvesting backpack system based on electrostatic damping provided by an embodiment of the present disclosure;
FIG. 2 is an exploded view of a portion of the structure of the backpack system of FIG. 1;
FIG. 3 is an exploded schematic view of the overall structure of the backpack system of FIG. 1;
FIG. 4 is an exploded schematic view of the friction power unit of the backpack system of FIG. 1; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 5 is a schematic exploded view of the electrostatic adsorption unit of the backpack system of FIG. 1;
FIG. 6 is a schematic view of the mover of the backpack system of FIG. 1;
FIG. 7 is a schematic diagram of a specific circuit connection structure of the friction power supply unit driving the electrostatic adsorption unit in the backpack system shown in FIG. 1;
fig. 8 is a schematic diagram of a specific circuit structure of a backpack system according to an embodiment of the present disclosure.
In the figure:
10. a backpack body; 11. a clamping groove; 12. a first connector; 13. a second connector; 14. an elastic belt; 15. a harness; 20. a self-powered variable stiffness device; 100. a friction power supply unit; 101. a first electrode substrate; 102. a first electrode; 103. friction layer one; 104. a friction layer II; 105. a driving plate; 200. an electrostatic adsorption unit; 201. a buffer layer; 202. a second electrode substrate; 203. a second electrode; 204. a first dielectric layer; 205. a second dielectric layer; 206. a third electrode; 207. a third electrode substrate; 300. a circuit management unit; 311. a capacitor; 312. a diode; 313. a zener diode; 314. and a switch S.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
On the contrary, the application is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the application as defined by the appended claims. Further, in the following detailed description of the present application, specific details are set forth in order to provide a more thorough understanding of the present application. The present application will be fully understood by those skilled in the art without a description of these details.
Referring to fig. 1 to 8, a variable stiffness energy collecting backpack system based on electrostatic damping according to an embodiment of the present disclosure includes a backpack body 10, a strap 15 (the strap is hollow), an elastic belt 14 fixedly connected to the strap 15, and a self-powered variable stiffness device 20 disposed between the backpack body 10 and the strap 15. Wherein the backpack body 10 is used for containing articles, and the back strap 15 is preferably in the form of a double shoulder strap. Typically, the backpack body 10, the back strap 15, the elastic strap 14 and the self-powered variable stiffness device 20 are integrally combined.
The back strap 15 is made of a hollow structural design and inelastic material, and is only used as a connecting piece between the backpack body 10 and shoulders of a wearer, and the back strap 15 is not telescopic; the elastic belt 14 is made of high-elasticity belt materials, one end of the elastic belt 14 is fixedly connected to the inside of the back belt 15, the other end of the elastic belt is fixedly connected to the inside of the clamping groove 11, the clamping groove 11 is fixedly arranged on one side of the backpack body 10 facing the back belt 15, most of the original length of the elastic belt 14 is positioned in the back belt 15, and only a small part of the length of the elastic belt exceeds the back belt 15 and is placed in the external environment. The elastic band 14 is used for connecting the back strap 15 and the backpack body 10, meanwhile, the elastic band 14 is also used for restraining the freedom of movement of the backpack body 10, so that relative sliding vertical to the ground is generated between the backpack body 10 and the back strap 15, and the high-elastic characteristic of the elastic band 14 reduces inertial impact force generated by the backpack body 10, provides a vibration reduction effect, and realizes movement decoupling between the backpack body 10 and the back strap 15 so as to reduce the load of a human body.
The self-powered stiffness-changing device 20 comprises a friction power supply unit 100, an electrostatic adsorption unit 200 and a circuit management unit 300, wherein the friction power supply unit 100 and the electrostatic adsorption unit 200 are respectively provided with a stator and a rotor, the stator of the friction power supply unit 100 and the stator of the electrostatic adsorption unit 200 are connected through a first connecting piece 12 and form a stator part of the backpack system together with a brace 15, and the rotor of the friction power supply unit 100 and the rotor of the electrostatic adsorption unit 200 are connected through a second connecting piece 13 and form a rotor part of the backpack system together with a backpack body 10; the friction power supply unit 100 converts kinetic energy stored by the elastic belt 14 into electric energy based on a friction electrification principle to drive the electrostatic adsorption unit 200, the electric energy is provided for the electrostatic adsorption unit 200 after being regulated by the circuit management unit 300, the electrostatic adsorption unit 200 changes the elastic rigidity of the backpack system based on electrostatic adsorption, and the electrostatic damping effect is realized by increasing the sliding damping force between the backpack body 10 and the back strap 15.
In some embodiments, referring to fig. 3, the back strap 15 is designed to be hollow, and enough space is left in the back strap to ensure that the elastic strap 14 can be smoothly installed in the internal cavity of the back strap 15; the elastic belt 14 is made of high-elasticity materials, such as rubber materials, polyurethane materials, styrene materials and the like, one end of the elastic belt is fixedly connected with the inner cavity of the back belt 15, the other end of the elastic belt is assembled in the clamping groove 11, the clamping groove 11 is positioned at the left end and the right end of the upper edge of the backpack body 10, so that the elastic belt 14 can uniformly support the backpack body 10, the elastic belt 14 is positioned in the back belt 15 for the most of the original length, and only a small part of the length of the elastic belt exceeds the back belt 15 and is positioned in the external environment; the length of the elastic belt 14 will determine the initial elastic stiffness of the backpack system, if the original length of the elastic belt 14 is longer, and the telescopic distance of the elastic belt 14 is larger, the initial elastic stiffness of the backpack system is smaller, the influence of the electrostatic damping effect generated by the subsequent electrostatic adsorption unit 200 on the change of the stiffness of the backpack system is larger, otherwise, if the original length of the elastic belt 14 is shorter, the telescopic distance of the elastic belt 14 is smaller, the initial elastic stiffness of the backpack system is larger, and the influence of the electrostatic damping effect generated by the electrostatic adsorption unit 200 on the change of the stiffness of the backpack system is smaller, so that the original length of the elastic belt 14 should be increased as much as possible under the premise of ensuring that the backpack body 10 can be better supported, so as to ensure the adjusting effect of the electrostatic damping effect on the stiffness of the backpack system.
In some embodiments, referring to fig. 4, the friction power supply unit 100 is disposed closer to the back strap 15 than the electrostatic adsorption unit 200, the friction power supply unit 100 is a symmetrical independent friction layer type nano friction generator structure, and includes a mover and stators symmetrically disposed at two sides of the mover, the mover of the friction power supply unit 100 includes a driving plate 105, and two sides of the driving plate 105 facing the stators are respectively and fixedly provided with a friction layer two 104; the stator of the friction power supply unit 100 includes a first electrode substrate 101, a first electrode 102 and a first friction layer 103 stacked in sequence, where the first friction layer 103 is disposed closer to the mover of the friction power supply unit 100 than the first electrode substrate 101, and the first friction layer 103 should completely cover the electrode 102 to prevent short circuit, so as to satisfy the power generation principle of the nano friction generator, the first friction layer 103 and the second friction layer 104 are made of two film materials with different electronegativity. Specifically, a layer of unconnected metal conductive electrodes is evaporated on one side, facing the mover, of the first electrode substrate 101 as the first electrode 102, and the first electrodes 102 are distributed in a grid form, so as to improve the charge output efficiency of the friction power supply unit 100, and the first electrode substrate 101, the first electrode 102 and the friction layer 103 positioned on two sides of the driving plate 105 form a whole through the first connecting piece 12, and are fixed on one side, facing the backpack body 10, of the strap 15 as a fixing component in the friction power supply unit 100; the two sides of the driving plate 105 facing the stator are provided with the same grid-type protruding structures, preferably, the grid-type protruding structures are consistent with the grid-type layout mode of the first electrode 102, the two side protruding structure surfaces are provided with a layer of friction layer two 104, the driving plate 105 and the friction layer two 104 form a motion assembly of the friction power supply unit 100 and are connected to the backpack body 10 together through the second connecting piece 13 and the mover in the electrostatic adsorption unit 200, and the size of the first electrode substrate 101 is required to cover the motion range of the driving plate 105. Optionally, the first connecting piece 12 is a strip-shaped plate connected to the upper edge and the lower edge of the first electrode substrate 101 at two sides of the driving plate 105, the second connecting piece 13 is a strip-shaped plate connected to the left side and the right side of the mover of the driving plate 105 and the electrostatic adsorption unit 200, and the first connecting piece 12 and the second connecting piece 13 are both in hollow design so as to reduce dead weight. When the driving plate 105 slides under the driving action of the backpack body 10, the friction layer two 104 and the friction layer one 103 are in contact friction with each other, the contact interface carries an equal amount of heterogeneous charges due to different electronegativity of materials, an electrostatic field is formed in the interface of the two friction layers, based on the principle of electrostatic induction, charges on the surface of the first electrode 102 are redistributed and continuously carried out along with the movement of the driving plate 105, two output ends of the first electrode 102 which are not connected on one first electrode substrate 101 are used as the first alternating current output ends of the friction power supply unit 100 so as to externally output an equal amount of heterogeneous charges, and similarly, two output ends of the first electrode 102 which are not connected on the other first electrode substrate 101 are used as the second alternating current output ends of the friction power supply unit 100 so as to externally output an equal amount of heterogeneous charges.
In some embodiments, referring to fig. 5, the electrostatic adsorption unit 200 is disposed closer to the backpack body 10 than the friction power supply unit 100, and the electrostatic adsorption unit 200 mainly absorbs and reduces a part of kinetic energy generated by the backpack body 10 through electrostatic adsorption, so as to achieve the function similar to a damper in an automobile suspension system, thereby increasing the overall rigidity of the backpack system and reducing the amplitude of the backpack body 10. The electrostatic adsorption mainly comprises the steps of applying hundreds to thousands of volts to a metal electrode, generating adsorption phenomenon under the action of electrostatic induction or polarization, accumulating equal amount of different charges on the surfaces of the electrode and an adsorbed object through the electrostatic induction and polarization of charges, and generating electrostatic adsorption force between a conductive electrode and the adsorbed object according to the principle that the same charges repel each other and the different charges attract each other, so as to realize the adsorption effect. The electrostatic adsorbing unit 200 of the present embodiment is composed of a buffer layer 201, a second electrode substrate 202, a second electrode 203, a first dielectric layer 204, a second dielectric layer 205, a third electrode 206, and a third electrode substrate 207 sequentially disposed along the direction from the back strap 15 to the backpack body 10, wherein the buffer layer 201, the second electrode substrate 202, the second electrode 203, and the first dielectric layer 204 constitute a stator of the electrostatic adsorbing unit 200, and the second dielectric layer 205, the third electrode 206, and the third electrode substrate 207 constitute a mover of the electrostatic adsorbing unit 200. Specifically, the buffer layer 201 is a sponge or other self-damping material, the second electrode 203 and the third electrode 206 are sheet-shaped electrodes made of copper foil, the second electrode 203 and the third electrode 206 have only geometrical differences (specifically, the widths of the second electrode 203 and the third electrode 206 are equal, the length of the second electrode 203 should cover the movement range of the third electrode 206 so as to ensure that electrostatic adsorption is generated between the two electrodes when the two electrodes are electrified), the first dielectric layer 204 and the second dielectric layer 205 are polyimide or other dielectric materials (the first dielectric layer 204 and the second dielectric layer 205 have the function of isolating each other so as to form an insulating state between the two electrodes). When the electric energy generated by the friction power supply unit 100 is output from the first electrode 102 and is transferred to the electrostatic adsorption unit 200, specifically, after the two ac output ends of the friction power supply unit 100 are rectified and controlled by a corresponding circuit management unit 300, positive and negative currents (or charges) are respectively formed, all positive charges (or currents) are injected into one of the second electrode 203 and the third electrode 206, all negative charges (or currents) are injected into the other electrode of the second electrode 203 and the third electrode 206, so that an electrostatic field is formed, and an electrostatic adsorption effect is generated between the second electrode 203 and the third electrode 206.
In some embodiments, referring to fig. 6, the third electrode substrate 207, the third electrode 206 and the second dielectric layer 205 form a whole to be used as a mover of the electrostatic adsorption unit 200, the driving plate 105 and the second friction layer 104 in the friction power supply unit 100 form a whole to be used as a mover of the friction power supply unit 100, and the mover of the electrostatic adsorption unit 200 and the mover of the friction power supply unit 100 are connected through the second connecting piece 13 and form a mover unit of the backpack system with the backpack body 10; except for the mover of the backpack system, the rest is fixedly connected with the back strap 15 to form a whole as the stator of the backpack system. When a human body walks by using the backpack system, the backpack body 10 generates vertical reciprocating sliding due to the inertia effect and the elastic effect of the elastic belt 14, and drives the mover unit of the backpack system to reciprocate.
In some embodiments, referring to fig. 7 and 8, two circuit management units 300 are provided in the backpack system of the present embodiment, and are respectively connected between one ac output terminal of the friction power supply unit 100 and one of the second electrode 203 and the third electrode 206 of the electrostatic adsorbing unit 200, and between the other ac output terminal of the friction power supply unit 100 and the other electrode of the second electrode 203 and the third electrode 206 of the electrostatic adsorbing unit 200. The two circuit management units 300 have the same structure and respectively comprise a boost rectifying circuit and a switch S314 which are connected, wherein the boost rectifying circuit consists of at least two diodes 312 and the same number of capacitors 311, the diodes are sequentially connected in parallel and in series, and each capacitor 311 is connected between the two diodes 312 in series in a staggered way, so that the boost rectifying circuit can add or delete a certain number of diodes and capacitors according to the requirement of an output circuit, but the number of the diodes and the capacitors is required to be ensured to be equal before actual use, and the capacitor plates at the same side as the positive electrode direction of the serial diodes are also the positive electrode due to the unidirectional current conduction characteristic of the diodes. In order to stabilize the output voltage, a zener diode 313 is connected in parallel to two output terminals of the circuit, and meanwhile, the boost rectifying circuit realizes dual functions of boost and rectification due to the serial-parallel characteristic of a plurality of capacitors in the circuit management unit 300. A switch S314 is connected to the boost rectifier circuit and the electrostatic adsorption unit 200, and the presence or absence of the electrostatic adsorption effect is adjusted by controlling the on/off of the switch S.
The working principle of the embodiment of the disclosure is described as follows:
when the backpack system is used, a heavy object is placed in the backpack body 10, and the elastic belt 14 with proper elastic rigidity and length is selected according to the mass of the heavy object in the backpack body 10 so as to adapt to the corresponding backpack weight, thereby achieving the purpose of vibration reduction and buffering. Specifically, if the backpack body 10 sags too much due to excessive backpack mass, the shrinkage force of the elastic strap 14 is insufficient to bear the backpack mass, and the elastic strap 14 needs to be replaced to increase the elastic stiffness of the elastic strap, so that the shrinkage force of the elastic strap 14 is sufficient to bear the current backpack mass, and the backpack body 10 is suspended in the middle balance position.
Then, the person's arms extend into the back strap 15 of the backpack to use the backpack normally, when the person walks or runs by wearing the backpack, the gravity center of the person can reciprocate up and down in the direction perpendicular to the ground due to the movement mechanism of the person, and at this time, the backpack body 10 is decoupled from the movement of the person under the action of the elastic belt 14, so that the relative sliding of the backpack body 10 with respect to the back strap 15 is realized, and the absolute displacement of the backpack body 10 with respect to the ground is small or almost no. Specifically, when a person walks forward, the double upright supporting state is changed into the double cross supporting state, the gravity center of the human body can descend at the moment of walking and striding, and the gravity center of the human body can descend relative to the ground before a knapsack. Further, since the backpack body 10 is fixed on the third electrode substrate 207 and is integrally connected with the mover of the friction power supply unit 100 and the mover of the electrostatic adsorption unit 200, the backpack body 10 can slide relatively with the stator portion of the backpack system through the second connecting member 13. When a person walks forward and strides, the gravity center of the person drives the braces 15 to descend together while descending, the elastic belts 14 are stretched along with the gravity center of the person, the backpack body 10 and the braces 15 are relatively displaced, the backpack body 10 has smaller absolute displacement or almost zero relative to the ground due to the elasticity of the elastic belts 14, and the rising process of the gravity center of the person is similar to the descending process, so that when the person walks or runs, the gravity center of the person moves up and down, the backpack body 10 and the braces 15 relatively slide, and meanwhile, the backpack body 10 is in a 'suspension' state relative to the ground, so that the impact action of the weight mass of the backpack on the person is reduced, and the effects of vibration reduction, buffering, labor saving and pressure relief of the shoulders of the person are realized.
Further, the backpack body 10 slides vertically and reciprocally due to inertia effect and elastic effect of the elastic belt 14, a part of inertia force generated by the backpack body 10 is absorbed by the elastic belt 14, the other part is transmitted to the mover of the friction power supply unit 100 through the second connecting piece 13, the mover of the friction power supply unit 100 is driven to perform sliding friction and generate corresponding charges, electric energy output by the friction power supply unit 100 is input into the circuit management unit 300, and enters the electrostatic adsorption unit 200 after being subjected to boosting rectification and on-off control effect of the circuit management unit 300, voltages are respectively provided for the second electrode 203 and the third electrode 206, so that corresponding electrostatic adsorption force is generated to improve the overall rigidity of the backpack system, and at the moment, the backpack body 10 reduces the amplitude of the reciprocating vibration under the action of the electrostatic adsorption force, so that the regulating function of the backpack system rigidity is realized. In addition, in this embodiment, by controlling the on/off of the switch S in the circuit management unit 300, whether the electric energy generated by the friction power supply unit 100 is transferred to the electrostatic adsorption unit 200 can be selected, so as to realize an active controllable function on the stiffness of the backpack system.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In the description of the embodiments of the present disclosure, it should be understood that the terms "top," "bottom," "up and down," "left and right," "coplanar," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.
In the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "fixedly attached," "affixed," "adhered," "adhesively bonded," "coated," "locked," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; the terms "mechanically" and "electrically" may be used in a generic sense to mean either a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, etc., as would be understood by one of ordinary skill in the art as appropriate, unless specifically defined otherwise.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The variable stiffness energy collection backpack system based on the electrostatic damping effect is characterized by comprising a backpack body, a brace with a hollow layer, an elastic belt fixedly connected with the hollow layer of the brace, and a self-powered variable stiffness device arranged between the backpack body and the brace;
one end of the elastic belt is fixedly connected in the hollow layer of the braces, and the other end of the elastic belt is fixedly connected with the backpack body;
the self-powered rigidity-changing device comprises a friction power supply unit, an electrostatic adsorption unit and a circuit management unit, wherein the friction power supply unit and the electrostatic adsorption unit are respectively provided with a stator and a rotor, the stators of the friction power supply unit and the electrostatic adsorption unit are connected through a first connecting piece and form a stator part of the rigidity-changing energy collection backpack system together with the braces, and the rotors of the friction power supply unit and the electrostatic adsorption unit are connected through a second connecting piece and form a rotor part of the rigidity-changing energy collection backpack system together with the backpack body; the friction power supply unit converts kinetic energy stored by the elastic belt into electric energy based on a friction electricity generation principle to drive the electrostatic adsorption unit, the electric energy is provided for the electrostatic adsorption unit after being regulated by the circuit management unit, the elastic rigidity of the variable rigidity energy collection backpack system is changed by the electrostatic adsorption unit based on the electrostatic adsorption effect, and the electrostatic damping effect is realized by increasing the sliding damping force between the backpack body and the braces.
2. The variable stiffness energy harvesting backpack system of claim 1 wherein the harness is made of inelastic material, a majority of the elastic strap being located within the hollow layer of the harness and a minority of the elastic strap being located outside of the harness.
3. The variable stiffness energy harvesting backpack system of claim 2 wherein an initial elastic stiffness of the variable stiffness energy harvesting backpack system is positively correlated with a length of the elastic strap.
4. The variable stiffness energy collection backpack system according to claim 1, wherein the friction power supply unit is arranged closer to the braces than the electrostatic adsorption unit, the friction power supply unit adopts a symmetrical independent friction layer type nano friction power generator structure, the friction power supply unit comprises a rotor and stators symmetrically arranged on two sides of the rotor, the rotor of the friction power supply unit comprises a driving plate, and two sides of the driving plate facing the stators are respectively fixedly provided with a friction layer II; the stator of friction power supply unit includes first electrode base plate, first electrode and friction layer one of stacking in proper order, just friction layer one compare first electrode base plate is close to friction power supply unit's active cell sets up, the size of first electrode base plate should cover the motion range of drive plate.
5. The variable stiffness energy harvesting backpack system of claim 4, wherein the first electrodes disposed on the first electrode substrate are arranged in a grid pattern, and wherein the two sides of the drive plate facing the stator are provided with identical grid-like raised structures that are consistent with the grid pattern of the first electrodes.
6. The variable stiffness energy harvesting backpack system of claim 4 wherein the first electrode substrate, the first electrode and the friction layer on either side of the drive plate are integrally secured to a face of the strap facing the backpack body by the first connector; the driving plate and the second friction layer are connected with the active cell in the electrostatic adsorption unit together through the second connecting piece and are connected with the backpack body.
7. The variable stiffness energy harvesting backpack system of claim 1, wherein the first and second connectors are each a strip-shaped plate having a hollowed-out structure, the first connector is connected between the mover of the friction power supply unit and the upper and lower sides of the mover of the electrostatic adsorption unit, and the second connector is connected between the mover of the friction power supply unit and the left and right sides of the mover of the electrostatic adsorption unit.
8. The variable stiffness energy harvesting backpack system of claim 1, wherein the electrostatic adsorption unit is disposed closer to the backpack body than the friction power supply unit, the electrostatic adsorption unit comprises a buffer layer, a second electrode substrate, a second electrode, a first dielectric layer, a second dielectric layer, a third electrode, and a third electrode substrate disposed in sequence along the strap to the backpack body, the buffer layer, the second electrode substrate, the second electrode, and the first dielectric layer comprise a stator of the electrostatic adsorption unit, the second dielectric layer, the third electrode, and the third electrode substrate comprise a mover of the electrostatic adsorption unit, the first dielectric layer is sized to completely cover the second electrode, the second dielectric layer is sized to completely cover the third electrode, and the second electrode is sized to completely cover a range of motion of the third electrode.
9. The variable stiffness energy harvesting backpack system of claim 8, wherein the circuit management unit is provided in two, the friction power supply unit has two ac outputs, a first circuit management unit is connected between a first ac output of the friction power supply unit and one of the second and third electrodes of the electrostatic absorption unit, a second circuit management unit is connected between a second ac output of the friction power supply unit and the other of the second and third electrodes of the electrostatic absorption unit, and the circuit management unit includes a boost rectifier circuit and a switch connected.
10. The variable stiffness energy harvesting backpack system of claim 9 wherein the boost rectifier circuit comprises a main circuit of at least two diodes connected with the same number of capacitors and a zener diode connected in parallel between the main circuit input and output; each diode is connected in series from head to tail in turn, and each capacitor is connected in series between the corresponding two diodes in a staggered manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311684345.9A CN117717225A (en) | 2023-12-08 | 2023-12-08 | A variable stiffness energy harvesting backpack system based on static resistance damping |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311684345.9A CN117717225A (en) | 2023-12-08 | 2023-12-08 | A variable stiffness energy harvesting backpack system based on static resistance damping |
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| CN117717225A true CN117717225A (en) | 2024-03-19 |
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| CN202311684345.9A Pending CN117717225A (en) | 2023-12-08 | 2023-12-08 | A variable stiffness energy harvesting backpack system based on static resistance damping |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110772016A (en) * | 2019-10-31 | 2020-02-11 | 南方科技大学 | Backpack |
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2023
- 2023-12-08 CN CN202311684345.9A patent/CN117717225A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110772016A (en) * | 2019-10-31 | 2020-02-11 | 南方科技大学 | Backpack |
| CN110772016B (en) * | 2019-10-31 | 2025-05-16 | 南方科技大学 | Backpack |
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