CN105743388B - A kind of foot-operated piezoelectric generating device and method - Google Patents

Abstract

The invention belongs to the technical field of power generation, and particularly relates to a foot-operated piezoelectric power generation device and method. The device is characterized in that it at least includes a pedal, a cover plate, an arc-shaped frame, and an arc-shaped cavity; Groove, two support blocks are fixed on the left and right ends of the rectangular groove of the pedal, the two support blocks are used to support the cover plate, the sum of the height of the support block and the cover plate is the same as the depth of the rectangular groove; the support block and The cover plate is fixedly connected by screws; the inner arc-shaped surface of the arc-shaped frame has the same shape as the bottom arc-shaped surface of the arc-shaped cavity, and the arc-shaped inner surface of the arc-shaped frame and the bottom circle of the arc-shaped cavity The arc-shaped surfaces fit together, and the arc-shaped frame, the arc-shaped cavity and the pedal are connected by bolts, nuts and springs. The device of the invention has the advantages of simple structure, low use cost and wide application range.

Description

A pedal-type piezoelectric power generation device and method

technical field

The invention belongs to the technical field of power generation, and in particular relates to a foot-operated piezoelectric power generation device and method, which are suitable for low-power electronic equipment that captures energy from human body movement and supplements energy.

technical background

In recent years, electronic information technology has developed rapidly, and many portable electronic devices have appeared, such as mobile communication tools, personal digital assistants, and medical electronic devices. These devices have relatively small power requirements, typically in the milliwatt range. At present, most of these mobile electronic devices are powered by batteries, but the battery power is limited, and when the battery power is exhausted, these devices cannot continue to work. In addition, waste batteries have caused significant pollution to the environment, and many arable lands have been polluted by heavy metals and cannot continue to grow crops. The disposal of waste batteries also requires a lot of social resources. The energy supply of the human body is continuous. If an appropriate energy harvesting device is used to collect energy from human body movements and charge portable electronic devices without affecting daily life, this will alleviate or even solve the energy problem of portable electronic devices.

In terms of utilization of human body energy, the foot movement of people is relatively regular when walking, and the energy application potential is great. Experimental studies have found that the maximum impact force of the feet on the ground when people walk is 1.4 times the weight of the human body. Taking a 65kg person as an example, when walking, the maximum force exerted by the soles of the feet on the ground can reach 1820N, and a large elastic potential energy is generated. In addition, the acceleration generated by foot movement can also be converted into electrical energy through the piezoelectric effect.

The application number is 201420107319.X, and the patent publication number is CN 203722317 U. Although it also uses the energy of the human body to generate electricity, the power generation method is to drive the second gear on the generator through the first gear in the pedal. Due to the mechanical friction loss between the gears, the invention has low power generation efficiency. The application number is 201410711978.9, and the patent publication number is CN 104333262 A. It is also a pedal-type piezoelectric power generation device, but the energy collection method is relatively simple. It only considers the pressure of the human body on the heel, ignoring the human body walking or The energy collection of vibration and swing during exercise, so the energy collection efficiency is not high.

Contents of the invention

The object of the present invention is to provide a pedal-type piezoelectric power generation device and method with simple structure, low use cost and wide application range, which can overcome the single energy collection method of the existing pedal-type power generation device.

The purpose of the present invention is achieved in this way, a pedal-type piezoelectric power generation device is characterized in that it at least includes a pedal, a cover plate, an arc-shaped frame, and an arc-shaped cavity; there is a rectangular groove on the pedal, two The support block is fixed at the left and right ends of the rectangular groove of the pedal, and the two support blocks are used to support the cover plate. The sum of the height of the support block and the cover plate is the same as the depth of the rectangular groove; the support block and the cover plate are fixed by screws connection; the inner arc-shaped surface of the arc-shaped frame has the same shape as the bottom arc-shaped surface of the arc-shaped cavity, and the arc-shaped inner surface of the arc-shaped frame fits with the bottom arc-shaped surface of the arc-shaped cavity, The arc-shaped frame, the arc-shaped cavity and the pedal are connected by bolts, nuts and springs.

The cover plate is a rectangular plate-shaped structure, on which a first piezoelectric cantilever beam and a second piezoelectric cantilever beam are arranged, and the cover plate has two through-hole slots in the length direction, between the two through-hole slots Separated by beams, the length and width of the through hole in the cover plate are equal to the length and width of the first piezoelectric cantilever beam or the second piezoelectric cantilever beam, so that the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are embedded in the It is fixed by the mass block in the through-hole groove.

The first piezoelectric cantilever includes a first piezoelectric element and a first rectangular piezoelectric metal beam, the second piezoelectric cantilever includes a second piezoelectric element and a second rectangular piezoelectric metal beam, the first The piezoelectric element is pasted on the above-mentioned first rectangular piezoelectric metal beam through conductive glue, and the second piezoelectric element is pasted on the above-mentioned second rectangular piezoelectric metal beam through conductive glue; The beam is polarized through the thickness, and the electrodes of the piezoelectric element are connected in series or in parallel.

The mass block includes a left mass block and a right mass block. Both the left mass block and the right mass block are composed of an upper thin mass sheet and a lower thin mass sheet. The upper thin mass sheet and the lower thin mass sheet are connected to the first piezoelectric cantilever through bolts. The beam or the second piezoelectric cantilever is fixedly connected.

The mass blocks are symmetrically distributed in the width direction and the thickness direction of the first piezoelectric cantilever beam or the second piezoelectric cantilever beam.

The arc-shaped cavity is seamlessly bonded to the cover plate; there are ferromagnetic balls in the arc-shaped cavity, and the arc-shaped cavity of the arc-shaped cavity provides a moving track for the ferromagnetic balls. At the same time, Through the compression and expansion of the arc-shaped cavity, the airflow passes back and forth through the through-hole slot in the cover plate, and drives the vibration of the first piezoelectric cantilever beam or the second piezoelectric cantilever beam.

The spring is used to assist the arc-shaped cavity to recover in time.

The function of the nut and the spring is to connect the pedal with the bottom frame, thereby connecting the whole structure together; the second is to adjust the compression range of the spring and the arc-shaped cavity by adjusting the position of the nut.

A method for a foot-operated piezoelectric power generation device, characterized in that: when the pedal receives pressure from the heel, the pressure acts on the arc-shaped cavity through the cover plate, so that the arc-shaped cavity is compressed and deformed , leading to an increase in the gas pressure in the arc-shaped cavity; the compressed gas in the cavity pushes the piezoelectric cantilever away from its original position and bends upward, at this time, an air channel is formed between the piezoelectric cantilever and the groove in the cover plate , the gas flows into the air vent on the side wall of the pedal through the air channel and flows out until the air pressure in the cavity is equal to the outside world;

When the heel leaves the ground, the arc-shaped cavity gradually returns to its original state due to its own elasticity and the action of the spring; at this time, the air pressure in the arc-shaped cavity is lower than the external air pressure, and the air passes through the pedal side wall The ventilation hole of the pedal flows into the pedal, pushing the piezoelectric cantilever beam to bend downward, so that the air flows into the arc-shaped cavity until the air pressure in the arc-shaped cavity is equal to the outside world;

The continuous generation and disappearance of pressure causes changes in the air pressure in the arc-shaped cavity, and the airflow passes back and forth through the through-hole slot in the cover plate, making the piezoelectric cantilever beam in the slot vibrate under the push of the airflow.

Compared with prior art, the beneficial effect of the present invention is:

(1) The energy collection method of the present invention is various, not only can collect energy from the swing and vibration of the human foot, but also can collect energy from the pressure of the foot on the power generation device during the walking or exercise of the human body, which effectively improves the human body movement. energy utilization;

(2) The present invention adopts a cantilever beam-type piezoelectric body structure, and uses a return spring to drive the rapid reset of the arc-shaped cavity, thereby increasing the deformation space generated when the next step is pressed, and improving energy conversion efficiency and power generation capacity;

(3) The invention is installed on the heel of the shoe, and uses human walking or movement as the power source to convert mechanical energy into electrical energy, and is especially suitable for providing electrical energy to portable electronic devices.

The energy collection method of the present invention is diverse, not only can utilize the pressure of the foot on the power generation device during human walking or exercise to collect energy, but also can collect the energy of foot swing and vibration, which improves the utilization rate of foot kinetic energy and human gravitational potential energy . The invention is installed on the heel of the shoe body. It uses the body's own weight, walking and exercise as the power source, converts mechanical energy into electrical energy through the piezoelectric effect, and stores it in the energy storage element.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of an exploded structure of an embodiment of the present invention;

Fig. 2 is a schematic diagram of the pedal structure;

Figure 3 is a schematic diagram of the structure of the cover plate;

Fig. 4 is a structural schematic diagram of a piezoelectric cantilever beam;

Fig. 5 is a schematic diagram of mass block structure;

Fig. 6 is a schematic diagram of the structure of an arc-shaped cavity;

Fig. 7 is a schematic diagram of an arc-shaped frame structure;

FIG. 8 is a schematic diagram of a bridge rectifier circuit.

In the figure: 1. Pedal; 2. Air vent; 3. Cover plate; 4. Mass block; 5. Piezoelectric cantilever beam; 6. Ferromagnetic sphere; 7. Screw; 8. Bolt; 9. Spring; 10. Nut ; 11. Arc-shaped cavity; 12. Arc-shaped frame; A. Equivalent circuit of piezoelectric cantilever beam; B. Bridge rectifier circuit; C. Energy storage element.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, a pedal-type piezoelectric power generation device includes a pedal 1, a cover plate 3, an arc-shaped frame 12, and an arc-shaped cavity 11; the pedal 1 has a rectangular groove 1-1 , two support blocks 1-2 are fixed on the left and right ends of the rectangular groove 1-1 of the pedal 1, the two support blocks 1-2 are used to support the cover plate 3, the sum of the heights of the support block 1-2 and the cover plate 3 The same depth as the rectangular groove 1-1; the support block 1-1 and the cover plate 3 are fixedly connected by screws 7; the inner arc-shaped surface of the arc-shaped frame 12 and the bottom arc of the arc-shaped cavity 11 The shape and surface are the same, the arc-shaped inner surface of the arc-shaped frame 12 fits the arc-shaped surface at the bottom of the arc-shaped cavity 11, and the arc-shaped frame 12 and the arc-shaped cavity are connected by bolts 8, nuts 10 and springs 9. Body 11 and pedal 1 are connected.

As shown in Figure 3, the cover plate 3 is a rectangular plate-shaped structure, on which a first piezoelectric cantilever beam 5-1 and a second piezoelectric cantilever beam 5-2 are arranged, and the cover plate 3 is in the longitudinal direction There are two through-hole slots 3-1, separated by a beam 3-2 between the two through-hole slots 3-1, the length and width of the through-hole slot 3-1 in the cover plate 3 is the same as that of the first piezoelectric cantilever beam 5 -1 or the length and width of the second piezoelectric cantilever 5-2 are equal, so that the first piezoelectric cantilever 5-1 and the second piezoelectric cantilever 5-2 are embedded in the through-hole slot 3-1 and pass through the mass block 4 fixed.

As shown in Figure 4, the first piezoelectric cantilever beam 5-1 includes a first piezoelectric element 5-1-1 and a first rectangular piezoelectric metal beam 5-1-2, and the second piezoelectric The cantilever beam 5-2 includes a second piezoelectric element 5-2-1 and a second rectangular piezoelectric metal beam 5-2-2, and the first piezoelectric element 5-1-1 is pasted on the above-mentioned first rectangular piezoelectric element by conductive glue. On the piezoelectric metal beam 5-1-2, the second piezoelectric element 5-2-1 is pasted on the above-mentioned second rectangular piezoelectric metal beam 5-2-2 through conductive adhesive; the piezoelectric element is pressed along the rectangular The electric metal beam is polarized in the thickness direction, and the electrodes of the piezoelectric element are connected in series or in parallel.

As shown in Figure 5, the mass block 4 includes a left mass block 4-1 and a right mass block 4-2, both of which are composed of an upper thin mass block 4-1-1 and the lower thin mass sheet 4-1-2, the upper thin mass sheet 4-1-1 and the lower thin mass sheet 4-1-2 are connected with the first piezoelectric cantilever beam 5-1 or the second piezoelectric cantilever beam through bolts 5-2 Fixed connection.

The mass blocks 4 are symmetrically distributed in the width direction and the thickness direction of the first piezoelectric cantilever beam 5-1 or the second piezoelectric cantilever beam 5-2.

As shown in Figure 6, the seamless bonding between the arc-shaped cavity 11 and the cover plate 3; the arc-shaped cavity of the arc-shaped cavity 11 provides a track for the ferromagnetic ball 6 to move, and at the same time, through The compression and relaxation of the arc-shaped cavity makes the air flow back and forth through the through-hole slot 3-1 in the cover plate 3, pushing the first piezoelectric cantilever beam 5-1 or the second piezoelectric cantilever beam 5-2 to vibrate.

As shown in Figure 7, the arc-shaped surface of the arc-shaped frame 12 has the same shape as the bottom arc-shaped surface of the arc-shaped cavity 11, and the arc-shaped surface of the arc-shaped frame 12 is the same as that of the arc-shaped cavity 11. The bottom arc-shaped surface fits, and the arc-shaped frame 12, the arc-shaped cavity 11, and the pedal 1 are connected by bolts 8, nuts 10 and springs 9. The effect of the spring 9 is to assist the arc-shaped cavity 11 to recover in time. The function of the nut 10 and the spring 9 is to connect the pedal 1 with the bottom frame, thereby connecting the whole structure together; the second is to adjust the cavity compression range of the spring 9 and the arc-shaped cavity 11 by adjusting the position of the nut 10 . In addition, the bolt 8 has a guiding effect, preventing the spring 9 from bending sideways.

As shown in FIG. 8 , the present invention also includes a piezoelectric cantilever beam equivalent circuit A, a bridge rectifier circuit B and an energy storage element C. The output of piezoelectric cantilever beam equivalent circuit A is converted into DC by bridge rectifier circuit B, and then stored in energy storage element C. The above-mentioned circuits and components are all known technologies, and will not be described in detail here.

A method for a foot-operated piezoelectric power generation device, when the pedal 1 receives pressure from the heel, the pressure acts on the arc-shaped cavity 11 through the cover plate 3, so that the arc-shaped cavity 11 is compressed and deformed , causing the gas pressure in the arc-shaped cavity 11 to increase; the compressed gas in the cavity pushes the piezoelectric cantilever 5 away from its original position and bends upwards. An air passage is formed, through which the gas flows into the ventilation hole on the side wall of the pedal 1 and flows out until the air pressure in the cavity is equal to the outside world;

When the heel leaves the ground, the arc-shaped cavity 11 gradually returns to its original state due to its own elasticity and the effect of the spring 9 . At this time, the air pressure in the arc-shaped cavity 11 is lower than the external air pressure, and the air flows into the pedal through the vent hole 2 on the side wall of the pedal 1, pushing the piezoelectric cantilever beam 5 to bend downward, so that the air flows into the arc-shaped cavity In the body 11, until the air pressure in the arc-shaped cavity is equal to the outside world;

The continuous generation and disappearance of pressure causes the change of the air pressure in the arc-shaped cavity 11, and the air flow passes through the through-hole groove in the cover plate 3 back and forth, so that the piezoelectric cantilever beam 5 in the groove vibrates under the push of the air flow.

At the same time, when a person is walking or exercising, the contact mode between the feet and the ground is that the heel touches the ground, the soles of the feet touch the ground, the toes touch the ground, and the soles of the feet leave the ground. People roll back and forth in the arc-shaped cavity due to the different contact modes between the feet and the ground during walking or sports. When the ferromagnetic sphere 6 rolls directly below the free end of the piezoelectric cantilever 5 , the magnet at the end of the piezoelectric cantilever 5 and the ferromagnetic sphere 6 are instantly adsorbed and released to excite the piezoelectric cantilever 5 to vibrate.

In addition, when the sole of the foot leaves the ground and steps forward, the piezoelectric cantilever 5 will obtain an instantaneous acceleration, which excites the piezoelectric cantilever 5 to vibrate. According to the piezoelectric effect, the deformation generated by the vibration of the piezoelectric cantilever 5 causes charges to be generated on the upper and lower plates of the piezoelectric cantilever 5, thereby realizing the conversion of mechanical energy into electrical energy. The generated electrical energy is converted into direct current through the bridge rectifier circuit B and then stored in the energy storage element C.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the scope of protection of this patent.

Claims (2)

1. A foot-operated piezoelectric power generation device, characterized by: at least including a pedal (1), a cover plate (3), an arc-shaped frame (12), an arc-shaped cavity (11); the pedal (1) There is a rectangular groove (1-1), and two support blocks (1-2) are fixed on the left and right ends of the rectangular groove (1-1) of the pedal (1), and the two support blocks (1-2) are used for Support the cover plate (3), the sum of the heights of the support block (1-2) and the cover plate (3) is the same as the depth of the rectangular groove (1-1); the support block (1-1) and the cover plate ( 3) Fixed connection by screws (7); the inner arc-shaped surface of the arc-shaped frame (12) has the same shape as the bottom arc-shaped surface of the arc-shaped cavity (11), and the circle of the arc-shaped frame (12) The arc-shaped inner surface fits the bottom arc-shaped surface of the arc-shaped cavity (11), and the arc-shaped frame (12) and the arc-shaped cavity ( 11), pedal (1) connection; The cover plate (3) is a rectangular plate-shaped structure, on which a first piezoelectric cantilever beam (5-1) and a second piezoelectric cantilever beam (5-2) are arranged, and the cover plate (3) is There are two through-hole slots (3-1) in the direction, and the two through-hole slots (3-1) are separated by a beam (3-2). The through-hole slot (3-1) in the cover plate (3) The length and width are equal to those of the first piezoelectric cantilever (5-1) or the second piezoelectric cantilever (5-2), so that the first piezoelectric cantilever (5-1) and the second piezoelectric The cantilever beam (5-2) is embedded in the through hole slot (3-1) and fixed by the mass block (4); The first piezoelectric cantilever beam (5-1) includes a first piezoelectric element (5-1-1) and a first rectangular piezoelectric metal beam (5-1-2), and the second piezoelectric The cantilever beam (5-2) includes a second piezoelectric element (5-2-1) and a second rectangular piezoelectric metal beam (5-2-2), and the first piezoelectric element (5-1-1) conducts The adhesive is pasted on the above-mentioned first rectangular piezoelectric metal beam (5-1-2), and the second piezoelectric element (5-2-1) is pasted on the above-mentioned second rectangular piezoelectric metal beam (5- 2-2) above; the piezoelectric element is polarized along the thickness direction of the rectangular piezoelectric metal beam, and the electrodes of the piezoelectric element are connected in series or in parallel; The mass (4) includes a left mass (4-1) and a right mass (4-2), both of which are composed of an upper thin mass ( 4-1-1) and the lower thin mass sheet (4-1-2), the upper thin mass sheet (4-1-1) and the lower thin mass sheet (4-1-2) are connected with the first piezoelectric The cantilever beam (5-1) or the second piezoelectric cantilever beam (5-2) is fixedly connected; The mass blocks (4) are symmetrically distributed in the width direction and the thickness direction of the first piezoelectric cantilever beam (5-1) or the second piezoelectric cantilever beam (5-2); The arc-shaped cavity (11) is seamlessly bonded to the cover plate (3); there are ferromagnetic balls (6) in the arc-shaped cavity (11), and the arc-shaped cavity (11) The arc-shaped cavity provides a moving track for the ferromagnetic ball (6), and at the same time, through the compression and relaxation of the arc-shaped cavity, the airflow passes back and forth through the through-hole slot (3-1) in the cover plate (3), pushing Vibration of the first piezoelectric cantilever (5-1) or the second piezoelectric cantilever (5-2); The spring (9) is used to assist the arc-shaped cavity (11) to recover in time; The function of the nut (10) and the spring (9) is to connect the pedal (1) with the bottom frame, thereby connecting the whole structure together; the second is to adjust the position of the nut (10) to adjust the spring (9) and the cavity compression range of the arc-shaped cavity (11). 2. A pedal-type piezoelectric power generation method, characterized in that: when the pedal (1) receives pressure from the heel, the pressure acts on the arc-shaped cavity (11) through the cover plate (3), so that the circle The arc-shaped cavity (11) is deformed under pressure, which causes the gas pressure in the arc-shaped cavity (11) to increase; the compressed gas in the cavity pushes the piezoelectric cantilever beam (5) away from its original position and bends upward , at this time, an air channel is formed between the piezoelectric cantilever beam and the groove in the cover plate, and the gas flows into the vent hole on the side wall of the pedal (1) through the air channel and flows out until the air pressure in the cavity is equal to the outside world; when the heel When leaving the ground, the arc-shaped cavity (11) gradually returns to its original state due to its own elasticity and the action of the spring (9); at this time, the air pressure in the arc-shaped cavity (11) is lower than the outside air pressure , the air flows into the pedal through the vent hole (2) on the side wall of the pedal (1), pushing the piezoelectric cantilever beam (5) to bend downward, so that the air flows into the arc-shaped cavity (11) until the arc-shaped The air pressure in the cavity is equal to the outside world; the continuous generation and disappearance of pressure causes the change of air pressure in the arc-shaped cavity (11), and the air flow passes back and forth through the through-hole groove in the cover plate (3), making the piezoelectric in the groove The cantilever beam (5) vibrates under the push of the airflow.