CN112847299A - Human joint energy recovery device and wearable electronic equipment comprising same - Google Patents
Human joint energy recovery device and wearable electronic equipment comprising same Download PDFInfo
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- CN112847299A CN112847299A CN201911172567.6A CN201911172567A CN112847299A CN 112847299 A CN112847299 A CN 112847299A CN 201911172567 A CN201911172567 A CN 201911172567A CN 112847299 A CN112847299 A CN 112847299A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/0006—Exoskeletons, i.e. resembling a human figure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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Abstract
The application provides a human joint energy recovery device which is used for capturing the motion bioenergy of joints so as to generate electric energy. The generated electrical energy may provide a real-time supply of electrical energy to the wearable electronic device. The device adopts a linear slide rail mechanism and is matched with a first limb and a second limb of a wearer to form a slider-crank mechanism, so that the rotary motion of a joint is converted into the linear motion of the linear slide rail mechanism. The bending beam structure converts the linear motion of the linear slide rail mechanism into bending motion. Piezoelectric films may be adhered to the upper and lower surfaces of the bending beam. During walking, the bending beam is subjected to bending deformation, so that the piezoelectric film is stretched or compressed, and electric energy is generated. In addition, in order to improve the energy recovery efficiency, the complete forced motion of the bending beam can be changed into partial forced motion and partial free oscillation motion. Meanwhile, the mass block is additionally arranged on the bending beam, so that free oscillation can be adjusted, and the energy recovery is further improved. The application also provides wearable electronic equipment equipped with the human joint energy recovery device and a human joint energy recovery method.
Description
Technical Field
The application relates to a human joint energy recovery device, in particular to a human joint energy recovery device based on a piezoelectric material. The application also relates to a wearable device equipped with the human joint energy recovery device.
Background
Along with the rapid development of electronic communication technology and the continuous improvement of human living standard, a large number of portable wearable mobile electronic devices, such as smart phones, smart watches, smart bracelets, blood pressure monitors and the like, appear in daily life. These wearable devices are capable of wireless connection and communication, and can be used in many aspects of human life, thereby improving quality of life and making human life more convenient. However, the limited life of the battery limits the widespread use of this type of device. In addition, frequent charging of mobile electronic devices also greatly reduces the consumer experience.
To solve the above problems, researchers have recently proposed self-powered wearable electronic devices, i.e., wearable electronic devices that can obtain energy sources in real time from the surrounding environment or the wearer, using energy recovery technology. The human body activity can generate a large amount of kinetic biological energy, heat energy, chemical energy, electrostatic energy and the like. For example, when the human body walks freely, the instantaneous maximum power of the knee joint and the hip joint can reach about 70 watts, and the maximum instantaneous power of the ankle joint can reach about 300 watts. The human body biological energy can be converted into electric energy through the energy conversion device, so that the problem of limitation of the endurance time of the conventional portable electronic equipment is solved. In addition, the wearable electronic equipment of self-energy supply can reduce the use of battery to alleviate the problem of old and useless battery pollution environment.
The knee joint has a greater range of motion than the ankle and hip joints of the human body. Furthermore, the motion of the knee joint occurs primarily in the sagittal plane, which helps the energy recovery device to more easily capture the motion of the knee joint. Based on the above advantages, many researchers are working on the energy recovery of human knee joints. For example, one prior patent application proposes the use of an electromagnetic recovery device to capture biomechanical energy from the motion of a person's knee. During walking, the power generation unit can be driven to rotate by the movement of the knee joint, so that energy generated by the movement of the knee joint is recovered. In order to improve energy recovery efficiency, a gear train having a large gear ratio is used to increase the speed of the electromagnetic generator, thereby increasing the induced electromotive force. However, such an energy recovery device is significantly bulky and heavy due to the use of the gear box. It is inconvenient for the user to wear and remove the device. In addition, the device has larger interaction force with the wearer, thereby obviously increasing the walking burden of the wearer and reducing the wearing experience of the wearer. The above drawbacks hinder the further development and widespread use of energy recovery based on electromagnetic technology.
Disclosure of Invention
The utility model provides a human joint energy recuperation device based on piezoelectricity intelligent material.
The device proposed in one embodiment of the present application is capable of capturing large amplitude movements of a joint (e.g., knee joint, elbow joint, ankle joint, etc.) and converting the moving biomechanical energy into electrical energy through flexible piezoelectric material, thereby providing a real-time energy supply for micropower portable wearable electronics.
According to one aspect of the present application, a human joint energy recovery device is provided. The apparatus may include: a first securing strap attached to a first articulated limb of the wearer; a second securing strap attached to a second articulated limb of the wearer; the motion conversion unit is arranged between the first fixing bandage and the second fixing bandage and is used for converting the rotary motion of the joint into linear motion; the bending beam is connected with the motion conversion unit, and the linear motion of the motion conversion unit is converted into the bending motion of the bending beam; and an energy conversion unit installed on an upper surface and/or a lower surface of the bending beam. The energy conversion unit may be deformed in response to the bending motion and convert the deformation into electrical energy.
According to an exemplary embodiment of the present application, the motion converting unit may include a slide rail mechanism including a linear guide and a slider. Wherein, linear guide is articulated with first fixed bandage to and slider and second fixed bandage are articulated. The sliding rail mechanism can be cooperated with the first limb and the second limb to operate as a crank sliding block mechanism, and can convert the rotary motion of the joint into the linear sliding of the sliding block on the linear guide rail. One end of the bending beam is hinged with the sliding block, and the other end of the bending beam is hinged with the linear guide rail.
According to another exemplary embodiment of the present application, the above human body joint energy recovery apparatus may further include: the first adjusting device is fixed on the first fixing binding belt; the second adjusting device is fixed on the second fixing binding belt; a first fixed rotating shaft mounted on a first adjusting device, the first adjusting device being configured to adjust an orientation of the first fixed rotating shaft; and a second fixed rotating shaft mounted on a second adjusting device configured to adjust an orientation of the second fixed rotating shaft. One end of the bending beam can be hinged with the first fixed rotating shaft. The motion conversion unit may include: one end of the sliding block stop block is connected with the other end of the bending beam; the linear slide rail is connected with the other end of the slide block stop block; and the sliding block is sleeved on the linear slide rail and rotates around the second fixed rotating shaft.
In order to allow the first and second fixing bands to be stably mounted at the corresponding portions of the human body, the contact curved surfaces of the first and second fixing bands may be designed according to the shape of the corresponding limb of the wearer.
According to an exemplary embodiment of the present application, the above human body joint energy recovery device may further include a mass fixed to the bending beam.
According to an exemplary embodiment of the present application, the energy conversion unit may include a piezoelectric film. The piezoelectric film may be made of, for example, a piezoelectric smart material or the like.
Piezoelectric films are adhered to the upper and lower surfaces of the bending beam. When the bending beam bears bending deformation, the piezoelectric film can generate tension-compression deformation, so that electric energy is generated.
The upper piezoelectric film and the lower piezoelectric film attached to the bending beam undergo opposite deformations. When the piezoelectric films are arranged in parallel, the positive electrode of the piezoelectric film bonded to the upper side of the bending beam should be connected to the negative electrode of the piezoelectric film bonded to the lower side of the bending beam, and vice versa. However, if the piezoelectric films are arranged in series, the positive electrode of the piezoelectric film bonded to the upper side of the bending beam should be connected to the positive electrode of the piezoelectric film bonded to the lower side of the bending beam, and vice versa. .
According to an exemplary embodiment of the present application, the first and second securing straps may be part of a garment of the wearer.
According to an exemplary embodiment of the present application, the bending beam may be configured as an elastic beam capable of withstanding large deformation, for example, an elastic beam made of carbon fiber or the like.
According to an exemplary embodiment of the present application, the piezoelectric film may be a flexible piezoelectric film or a stretchable piezoelectric film. For example, the piezoelectric film may be made of a piezoelectric fiber composite material or the like.
According to an exemplary embodiment of the present application, the energy conversion unit may be configured as a friction transduction device capable of converting mechanical energy into electrical energy.
According to an exemplary embodiment of the present application, a joint may include, for example (but not limited to), one of a knee joint, an ankle joint, an elbow joint, and the like.
According to an exemplary embodiment of the application, the bending beam may be bent when the joint performs a flexion movement, causing the energy conversion unit to deform and convert said deformation into electrical energy.
According to an exemplary embodiment of the present application, the slider may be fixedly connected with the slider stopper. During the wearer's walking, the curved beam undergoes forced movement throughout the gait cycle.
According to an exemplary embodiment of the present application, the slider may be freely contacted with the slider stopper, and the slider may be moved along the linear slide. During the walking process of the wearer, the bending beam bears forced movement and free oscillation movement in the whole gait cycle.
According to exemplary embodiments of the present application, when the bending beam is subjected to forced motion and free oscillating motion, the mass may be configured to accommodate the free oscillating motion to improve energy recovery efficiency.
According to another aspect of the present application, there is provided a wearable electronic device comprising an energy supply unit. When the wearable electronic device is worn by a user, the electric energy supply unit may be configured to be electrically connected with the human joint energy recovery device to supply the electric energy generated by the human joint energy recovery device to the wearable electronic device, for example, in real time.
According to yet another aspect of the present application, a method of energy recovery in a joint of a human body is provided. The method can comprise the following steps: attaching a first securing strap to a first limb of the wearer connected to an articulation of the wearer; attaching a second securing strap to the articulating second limb of the wearer; converting the rotational motion of the joint into a linear motion by a motion conversion unit connected between the first and second securing straps; converting the linear motion of the motion conversion unit into a bending motion of a bending beam by using the bending beam connected with the motion conversion unit; and deforming the energy conversion unit mounted on the upper surface and/or the lower surface of the bending beam in response to the bending motion and converting the deformation into electric energy by the energy conversion unit.
According to an exemplary embodiment of the present application, the above motion conversion unit may include a slide rail mechanism including a linear guide and a slider. The linear guide is connected with the first fixing strap, and the slider is connected with the second fixing strap. The slide rail mechanism cooperates with the first limb and the second limb to operate as a slider-crank mechanism. The step of converting into linear motion includes converting rotational motion of the joint into linear sliding motion of the slider on the linear guide.
According to an exemplary embodiment of the present application, one end of the bending beam is connected with the slider and the other end is connected with the linear guide. The step of converting the electric energy comprises the steps of enabling the sliding block to move along the linear guide rail through the buckling movement of the joint, so that the bending beam is forced to deform, and converting the deformation of the bending beam into the electric energy.
According to an exemplary embodiment of the present application, the method may further include fixing a first adjusting means on the first fixing strap; fixing a second adjusting device on a second fixing strap; mounting the first fixed rotating shaft on the first adjusting device, and adjusting the direction of the first fixed rotating shaft by using the first adjusting device; mounting the second fixed rotating shaft on a second adjusting device, and adjusting the direction of the second fixed rotating shaft by using the second adjusting device to ensure that one end of the bending beam is connected with the first fixed rotating shaft and the other end of the bending beam is connected with the motion conversion unit; and forcing the bending beam to deform through the linear motion of the motion conversion unit, and converting energy generated by the deformation of the bending beam into electric energy.
According to an exemplary embodiment of the present application, the above motion conversion unit includes: the other end of the bending beam is connected with one end of the sliding block stop block; the linear slide rail is connected with the other end of the slide block stop block; and the sliding block is arranged on the linear sliding rail and is hinged around the second fixed rotating shaft. The step of converting into electric energy may include: the slider moves along the linear sliding rail through the buckling movement of the joint, so that the bending beam is forced to deform, and energy generated by the deformation of the bending beam is converted into electric energy.
Drawings
The principles of the inventive concept are explained below by describing non-limiting embodiments of the present application in conjunction with the drawings. It is to be understood that the drawings are intended to illustrate exemplary embodiments of the application and not to limit the same. The accompanying drawings are included to provide a further understanding of the inventive concepts of the application, and are incorporated in and constitute a part of this specification. Like reference numerals in the drawings denote like features. In the drawings:
fig. 1A to 1E are schematic views showing the operation principle of the human joint energy recovery apparatus according to the first embodiment of the present application.
Fig. 2 shows a schematic configuration of a human joint energy recovery apparatus according to a first embodiment of the present application.
Fig. 3 shows a graph of output power of the human joint energy recovery device according to the first embodiment of the present application at different load resistances.
Fig. 4 shows a graph of output power of the human joint energy recovery device according to the first embodiment of the present application at different walking speeds.
Fig. 5 is a schematic view illustrating an operation principle of the human joint energy recovery apparatus according to the second embodiment of the present application.
Fig. 6 shows a schematic configuration of a human joint energy recovery apparatus according to a second embodiment of the present application.
Figures 7A-7C illustrate a schematic view of the operation of a human joint energy recovery device according to a second embodiment of the present application in different installation situations.
Fig. 8 is a graph showing output voltages of the human joint energy recovery apparatus according to the second embodiment of the present application in different installation states.
Fig. 9 shows a schematic view of a wearable electronic device powered by a human joint energy recovery device according to an embodiment of the present application.
Fig. 10 shows a flow chart of a human joint energy recovery method according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way.
The terminology used herein is for the purpose of describing particular example embodiments and is not intended to be limiting. The terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, elements, components, and/or groups thereof.
In addition, the expressions "connected to" and "connected to" … may mean that the relevant components are directly connected, and other components may be interposed between the relevant components.
It should be noted that in the present specification and claims, expressions such as first, second, etc. are used only to distinguish one feature from another, and do not imply any limitation on the features. Thus, the first securing strap, first adjustment device, first securing spindle discussed below may also be referred to as a second securing strap, second adjustment device, second securing spindle without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of components have been slightly exaggerated for convenience of illustration. The figures are merely illustrative and are not drawn to scale.
The technical solution of the present application is described with reference to schematic diagrams of exemplary embodiments. The exemplary embodiments disclosed herein should not be construed as limited to the particular shapes and dimensions shown, but are to include various equivalent structures capable of performing the same function, as well as deviations in shapes and dimensions that result, for example, from manufacturing. The locations shown in the drawings are schematic in nature and are not intended to limit the specific locations of the various components.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Various aspects of the present application are described in more detail below with reference to the figures.
Fig. 1A to 1E are schematic views showing the operation principle of the human joint energy recovery apparatus according to the first embodiment of the present application. Fig. 2 shows a schematic configuration of a human joint energy recovery apparatus according to a first embodiment of the present application.
As shown in FIGS. 1C and 1E, the human joint energy recovery device 10 may include a thigh securing strap 101 secured to the thigh 12 of the wearer and a calf securing strap 106 secured to the calf 14 of the wearer. The thigh securing strap 101 and the lower leg securing strap 106 may be provided, for example, as part of the wearer's garment. Further, the thigh securing strap 101 and the lower leg securing strap 106 may also be provided as wearable parts that can be worn on the thigh and the lower leg.
The human joint energy recovery apparatus 10 may further include a motion conversion unit 100 converting a rotational motion of the knee joint 16 into a linear motion. The motion converting unit 100 is disposed between the thigh fixing band 101 and the calf fixing band 106 and is hinged with the thigh fixing band 101 and the calf fixing band 106 to convert the rotational motion of the joint into a linear motion. For example, the motion conversion unit 100 may be implemented as the crank block mechanism 100 shown in fig. 1B. For example, the linear slide rail mechanism 18 may cooperate with the wearer's thigh 12, calf 14, knee joint 16 to operate as a slider-crank mechanism 100 to translate rotational motion of the wearer's knee joint 16 into linear motion of the linear slide rail mechanism 18.
The linear slide mechanism 18 may include a slider 103, a linear guide 102, and a guide securing end 108. The slider 103 is slidable along the linear guide 102 but is not rotatable. The slider 103 may be hinged to the lower leg harness 106, for example, by a spherical hinge 109, such that the slider 103 may rotate relative to the lower leg harness 106. As shown in fig. 2, the linear guide 102 is fixedly connected to the guide fixing end 108. The rail fixing end 108 is hinged to the thigh securing strap 101 by a spherical hinge 107 so that the linear rail 102 can rotate relative to the thigh securing strap 101.
As an example, when the wearer's knee joint performs a flexion motion, the slider 103 may slide along the linear guide 102 toward the guide fixing end 108, thereby compressing the bending beam 104 connected to the slider 103 and the linear guide 102 to be deformed. The energy generated by the deformation of the bending beam 104 may then be converted into electrical energy by any suitable means.
As shown in FIG. 1D, the human joint energy recovery device 10 can use the bending beam 104 to convert the linear motion of the slider 103 into the bending motion of the bending beam 104. One end of the bending beam 104 is hinged with the sliding block 103, and the other end is hinged with the guide rail fixing end 108. The bending beam 104 may be an elastic beam capable of withstanding large deformation, such as a carbon fiber beam or the like.
As described above, the existing human body power generation device based on electromagnetic technology is relatively large in size and heavy in structure, and there is relatively large interaction force between the device and the wearer, which significantly increases the walking burden of the wearer and reduces the wearing experience of the wearer.
To reduce the weight and volume of the device to reduce the impact on the wearer's movements, more lightweight smart material based energy recovery devices have been proposed. The energy recovery device is dedicated to providing real-time energy supply for micro-power portable electronic products (such as smart bracelets, smart watches and the like) which are widely used at present. The energy recovery device based on the intelligent material is simple in structure and does not need a heavy speed increasing box. In addition, the running noise of the device can be reduced, and the use experience of a wearer is improved. Smart material based energy recovery devices may include thermoelectric recovery devices, triboelectric recovery devices, and piezoelectric energy recovery devices. The piezoelectric energy recovery device has the characteristics of simple structure, easiness in miniaturization, convenience in installation and the like, and is widely researched in recent years.
When the piezoelectric material is subjected to external pressure or pulling force, charges in the material move directionally, and a voltage difference is formed between two ends of the material. Piezoelectric materials can convert mechanical energy into electrical energy using the piezoelectric properties described above.
In recent years, with the development of smart materials, flexible piezoelectric materials such as polyvinyl fluoride piezoelectric film (PVDF), piezoelectric fiber composite (MFC), and the like have been proposed. Such flexible piezoelectric materials can undergo large mechanical deformations to obtain more electrical energy. For example, chinese patent application No. 201810457579.2 proposes a low frequency flexible energy harvester in which a flexible piezoelectric film attached to a flexible cantilever beam can be used to convert limb motion into high frequency resonant power generation.
The flexible intelligent material is easy to bend, can be stretched and deformed, has large deformation, is easy to be coupled with large-deformation mechanical motion, and can directly and efficiently convert mechanical energy into electric energy, so the flexible intelligent material has huge development potential and commercial application prospect in the field of human body motion energy recovery.
In an exemplary embodiment of the present application, an energy conversion unit such as a piezoelectric film 105 may be disposed on an upper surface and/or a lower surface of the bending beam 104. When the bending beam 104 is bent and deformed, the piezoelectric film 105 may be stretched or compressed, thereby converting energy generated by the deformation into electric energy. The piezoelectric film 105 may be a flexible piezoelectric film or a stretchable piezoelectric film, such as a piezoelectric fiber composite material or the like.
The piezoelectric films 105 on the upper and lower surfaces of the bending beam 104 undergo opposite deformations. When the piezoelectric films 105 are arranged in parallel, the positive electrode of the piezoelectric film 105 bonded to the upper surface of the bending beam 104 should be connected to the negative electrode of the piezoelectric film 105 bonded to the lower surface of the bending beam 104, and vice versa.
Fig. 3 shows a graph of output power of the human joint energy recovery device according to the first embodiment of the present application at different load resistances. In fig. 3, the test conditions were that the wearer was walking on the treadmill with the speed set to the normal walking speed of 4km/h and the load resistance was set to a series of values in the test. It should be noted that the test shown has the piezoelectric film 105 adhered only to the upper surface of the bending beam. The piezoelectric film 105 has a thickness of 0.3mm, a width of 14mm and a length of 200 mm. However, it is to be understood that the piezoelectric film may be adhered only to the lower surface of the bending beam, or may be adhered to both the upper surface and the lower surface of the bending beam. In addition, the size of the piezoelectric film used in the test is merely an example, and the piezoelectric film may be provided in other suitable sizes and shapes as needed.
Fig. 4 shows a graph of output power of the human joint energy recovery device according to the first embodiment of the present application at different walking speeds. In the test, the wearer walked on the treadmill, the load resistance was set to 300k Ω and the walking speed was set to a series of values. It should be noted that in this test only the upper surface of the bending beam is adhered with a piezoelectric film. The piezoelectric film had a thickness of 0.3mm, a width of 14mm and a length of 200 mm. However, it is to be understood that the piezoelectric film may be adhered only to the lower surface of the bending beam, or may be adhered to both the upper surface and the lower surface of the bending beam. In addition, the size of the piezoelectric film used in the test is merely an example, and the piezoelectric film may be provided in other suitable sizes and shapes as needed.
Fig. 5 is a schematic view showing the principle of a human body joint energy recovery apparatus according to a second embodiment of the present application, and fig. 6 is a schematic view showing the structure of the human body joint energy recovery apparatus according to the second embodiment of the present application. As shown in FIG. 5, the device 20 may include a thigh strap 221 secured to the thigh 22 of the wearer and a lower leg strap 211 secured to the lower leg 24 of the wearer.
The human joint energy recovery device 20 may further comprise a thigh adjustment device 201 mounted on the thigh securing strap 221 and a lower leg adjustment device 210 mounted on the lower leg securing strap 211. The thigh fixing rotation shaft 212 is fixed to the thigh adjusting device 201. The thigh adjustment device 201 may be configured to change the orientation of the thigh securing pivot 212 to adjust the comfort of the thigh securing strap 221 on the thigh. Lower leg fixing shaft 213 is fixed to lower leg adjustment device 210. Lower leg adjustment device 210 can be configured to change the orientation of lower leg fixation pivot 213 to adjust the comfort with which lower leg securing strap 211 is worn on the lower leg.
The human joint energy recovery device 20 may further include a motion conversion unit 200. The motion converting unit 200 is disposed between the thigh fixing strap 221 and the calf fixing strap 211 and connected with the thigh fixing strap 221 and the calf fixing strap 211 to convert the rotational motion of the knee joint 26 into the linear motion.
Further, the bending beam 205 may be connected with the motion converting unit 200. As an example, the bending beam 205 may be provided between the thigh securing strap 221 and the calf securing strap 211 together with the motion conversion unit 200. One end of the bending beam 205 may be fixedly connected to the bending beam fixing end 202, and the other end is fixedly connected to the motion converting unit 200. By adjusting the orientation of thigh fixation axis 212 and shank fixation axis 213, flexure beam 205 can be made parallel to the sagittal plane of the wearer.
In an exemplary embodiment, the motion conversion unit 200 may include a slider stopper 206, a linear guide 209, and a slider 207. The slider stopper 206 is fixedly connected with the linear guide 209. The other end of the bent beam 205 is connected to a slider stopper 206 of the motion converting unit 200. A linear slide 209 may be connected to the other end of the slider stop 206. The slider 207 may be connected to the lower leg securing strap 211 via a spherical hinge 208 and may move along a linear slide 209.
The bending beam fixing end 202 can rotate around the thigh fixing rotation shaft 212. The bending beam 205 may be, for example, an elastic beam capable of withstanding large deformation, such as a carbon fiber beam or the like. Energy conversion elements such as piezoelectric films 204 are disposed on the upper and/or lower surfaces of the bending beam 205. When the wearer walks, the bending beam can convert the linear motion of the motion conversion unit into the bending motion. The piezoelectric film 204 may deform in response to the bending motion and convert energy generated by the deformation into electrical energy.
The piezoelectric films 204 on the upper and lower surfaces of the bending beam 205 undergo opposite deformations. When the piezoelectric films 204 are arranged in parallel, the positive electrode of the piezoelectric film 204 adhered to the upper surface of the bending beam 205 should be connected to the negative electrode of the piezoelectric film 204 adhered to the lower surface of the bending beam 205, and vice versa.
The mass 203 may be fixed to the flexure beams 205.
The slider stopper 206 has two contact modes with the slider 207: fixed contact mode and free contact mode. Fig. 7A shows a schematic view of the slider stop 206 in fixed contact mode with the slider 207. As shown in fig. 7A, in the solid mode, the slider 207 is fixed to the slider stop 206 and the curved beam 205 is only subject to forced movement throughout the wearer's gait cycle. Fig. 7B shows the slider stop 206 in free contact mode with the slider 207. In the free contact mode, the slider 207 can slide along the linear slide 209 and the curved beam 205 will undergo forced and free oscillatory motion, as shown in fig. 7B. Fig. 7C is a schematic diagram showing the slider stop 206 and the slider 207 configured in a free contact mode and the mass 203 fixed to the flexure beams 205. When the knee joint is rotated at a large angle, the bending beam 205 is pressed to be deformed. When the knee joint is rotated by a small angle, the bending beam 205 can freely oscillate. When the slider stopper 206 is in free contact with the slider 207, the mass 203 can be used to adjust the free oscillation motion of the bending beam 205, thereby improving the energy recovery efficiency of the human joint energy recovery device 20.
Fig. 8 shows output voltage diagrams of the human joint energy recovery apparatus according to the second embodiment of the present application in three modes shown in fig. 7A to 7C. In the test, the wearer walks on the treadmill at a normal walking speed of 4km/h with a load resistance of, for example, 100k Ω. It should be noted that the piezoelectric film was adhered only to the upper surface of the bending beam in the test, and the piezoelectric film had a thickness of 0.3mm, a width of 28mm, and a length of 309mm as an example. It can be seen from fig. 8 that when the slider stopper 206 is in free contact with the slider 207, the bending beam 205 will undergo forced movement and free oscillation during walking, so that the deformation of the bending beam can be increased to recover more electric energy.
Although the knee joint is described in the above embodiments, it should be noted that the knee joint is merely used as an example. In other embodiments, the knee joint may be replaced with an ankle joint, an elbow joint, or the like.
Further, the energy conversion unit may be configured as a friction transducer device or the like capable of converting mechanical energy into electrical energy, without being limited to the piezoelectric film.
The human joint energy recovery device according to embodiments of the present application may be used to power a wearable electronic device. For example, as shown in fig. 9, the human joint energy recovery device 20 may be wirelessly connected with the energy supply unit 302 of the wearable electronic device 30 to supply the generated electric energy to the wearable electronic device 30 through the energy supply unit 302. The wearable electronic device 30 may be, for example (but not limited to), a smart bracelet, a smart watch, a smart electrocardiograph, or the like.
Fig. 10 shows a method S1000 for energy recovery in a human joint. In steps S1002 and S1004, a thigh securing strap is attached to a thigh of the wearer and a lower leg securing strap is attached to a lower leg of the wearer. When the knee joint performs the flexion-extension motion, the motion conversion unit connected between the thigh fixing band and the calf fixing band converts the rotational motion of the knee joint into the linear motion in step S1006. In step 1008, the bending beam is connected to the motion converting unit and converts the linear motion of the motion converting unit into a bending motion of the bending beam. In step 1010, an energy conversion unit mounted on an upper surface and/or a lower surface of the bending beam deforms in response to the bending motion and converts the deformation into electric energy through the energy conversion unit.
In an exemplary embodiment of the present application, for example, the human joint energy recovery device 20 may be worn on a leg of a wearer. When the wearer walks, the wearer's knee joint performs flexion and extension movements. The bending beam 205 hinged between the slider block 206 and the thigh securing strap 221 is bent. The piezoelectric film 204 adhered to the bending beam 205 deforms in response to the bending of the bending beam 205. The deformation generated by the piezoelectric film 204 can be converted into electrical energy using the piezoelectric properties of the piezoelectric material.
For example, the motion conversion unit used in the method S1000 may be, for example, the slider-crank mechanism 100 described above with reference to fig. 1B or the slider-linear guide mechanism 200 described above with reference to fig. 5. It should be understood that these mechanisms are merely illustrative and are not intended to limit the scope of the present application.
Exemplary embodiments of the present application are described above with reference to the accompanying drawings. It should be understood by those skilled in the art that the above-described embodiments are merely examples for illustrative purposes and are not intended to limit the scope of the present application. The scope of the present application is to be given the full breadth of the appended claims and any and all equivalents thereof, including any combination of features thereof. Any modifications, equivalents and the like which come within the teachings of this application and the scope of the claims should be considered to be within the scope of this application.
Claims (20)
1. A human joint energy recovery device comprising:
a first securing strap attached to a first limb of a wearer connected to an articulation of the wearer;
a second securing strap attached to a second limb of the wearer connected to the joint;
a motion conversion unit connected between the first and second fixing bands for converting a rotational motion of the joint into a linear motion;
a bending beam connected with the motion conversion unit, wherein the linear motion of the motion conversion unit is converted into a bending motion of the bending beam; and
an energy conversion unit mounted on an upper surface and/or a lower surface of the bending beam, wherein the energy conversion unit deforms in response to the bending motion and converts the deformation into electric energy.
2. The human joint energy recovery device of claim 1,
the motion conversion unit comprises a slide rail mechanism, the slide rail mechanism comprises a linear guide rail and a slide block,
wherein the linear guide is coupled to the first harness strap and the slider is coupled to the second harness strap, the slide mechanism cooperating with the first limb and the second limb to operate as a slider-crank mechanism to convert the rotational motion of the joint into linear sliding of the slider on the linear guide; and
wherein one end of the bending beam is connected with the slider, and the other end of the bending beam is connected with the linear guide.
3. The human joint energy recovery device of claim 1, further comprising:
a first adjustment device fixed to the first fixing strap;
the second adjusting device is fixed on the second fixing binding belt;
a first fixed rotating shaft mounted on the first adjusting device, wherein the first adjusting device is configured to adjust an orientation of the first fixed rotating shaft;
a second stationary rotating shaft mounted on the second adjusting device, wherein the second adjusting device is configured to adjust an orientation of the second stationary rotating shaft,
wherein one end of the bending beam is connected with the first fixed rotating shaft, an
Wherein the motion conversion unit includes:
one end of the sliding block stop block is connected with the other end of the bending beam;
the linear sliding rail is connected with the other end of the sliding block stop block; and
and the sliding block is arranged on the linear sliding rail and rotates around the second fixed rotating shaft.
4. The human joint energy recovery device of claim 3, further comprising:
and the mass block is fixed on the bending beam.
5. The human joint energy recovery device of claim 1, wherein said energy conversion unit comprises a piezoelectric film.
6. The body joint energy recovery device of claim 1, wherein the first and second securing straps are part of the wearer's garment.
7. The human joint energy recovery device according to claim 1, wherein said energy conversion unit is configured as a friction transduction device capable of converting mechanical energy into electrical energy.
8. The human joint energy recovery device of claim 1, wherein the joint comprises one of a knee joint, an ankle joint, and an elbow joint.
9. The human joint energy recovery device according to claim 1, wherein the energy conversion unit is deformed and converts the deformation into electric energy in response to the bending beam being bent when the joint performs a flexion motion.
10. The device according to claim 4, wherein the slider is fixedly connected to the slider stop.
11. The device according to claim 10, wherein the curved beam undergoes forced movement throughout the gait cycle during walking of the wearer.
12. The body joint energy recovery device of claim 4, wherein the slider is in free contact with the slider stop and the slider moves along the linear slide.
13. The device according to claim 12, wherein the curved beam undergoes forced and free oscillatory motion throughout the gait cycle during walking of the wearer.
14. The device for energy recovery from human joints of claim 13, wherein the mass is configured to modulate free oscillatory motion when the bending beam is subject to forced motion and free oscillatory motion to improve energy recovery efficiency.
15. A wearable electronic device comprising an energy supply unit, wherein,
when the wearable electronic device is worn by a user, the electric energy supply unit is electrically connected with the human joint energy recovery device according to claim 1 to supply the electric energy generated by the human joint energy recovery device to the wearable electronic device.
16. A method of energy recovery in a human joint, comprising:
attaching a first securing strap to a first limb of a wearer connected to an articulation of the wearer;
attaching a second securing strap to a second limb of the wearer connected to the joint;
converting rotational motion of the joint into linear motion by a motion conversion unit connected between the first and second securing straps;
converting the linear motion of the motion conversion unit into a bending motion of the bending beam by using the bending beam connected with the motion conversion unit; and
deforming an energy conversion unit mounted on an upper surface and/or a lower surface of the bending beam in response to the bending motion and converting the deformation into electric energy by the energy conversion unit.
17. The human joint energy recovery method according to claim 16,
the motion conversion unit comprises a slide rail mechanism comprising a linear guide and a slider, the linear guide being connected with the first immobilisation strap and the slider being connected with the second immobilisation strap, the slide rail mechanism cooperating with the first limb, the second limb to operate as a slider-crank mechanism,
wherein the step of converting the rotational motion to the linear motion comprises:
and converting the rotary motion of the joint into linear sliding of the sliding block on the linear guide rail.
18. The human joint energy recovery method of claim 17, wherein one end of the bending beam is connected to the slider, and the other end of the bending beam is connected to the linear guide, and
wherein the step of converting the deformation into electrical energy comprises:
the sliding block moves along the linear guide rail through the bending movement of the joint, so that the bending beam is forced to deform;
converting the deformation of the bending beam into electrical energy.
19. The human joint energy recovery method of claim 16, further comprising,
securing a first adjustment device to the first securing strap;
securing a second adjustment device to the second securing strap;
mounting a first fixed rotating shaft on the first adjusting device, and adjusting the orientation of the first fixed rotating shaft by using the first adjusting device;
mounting a second fixed rotating shaft on the second adjusting device, and adjusting the orientation of the second fixed rotating shaft by using the second adjusting device,
connecting one end of the bending beam with the first fixed rotating shaft; and
the bending beam is forced to deform by the linear motion of the motion conversion unit, and the energy generated by the deformation of the bending beam is converted into electric energy.
20. The human joint energy recovery method according to claim 19, wherein the motion converting unit comprises:
the other end of the bending beam is connected with one end of the sliding block stop block;
the linear sliding rail is connected with the other end of the sliding block stop block; and
a slider mounted on the linear slide rail and rotating around the second fixed rotating shaft, wherein the step of converting into electrical energy comprises:
the sliding block moves along the linear sliding rail through the bending movement of the joint, so that the bending beam is forced to deform; and
converting the deformation of the bending beam into electrical energy.
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