A cable-type piezoelectric energy collection device for road surfaces

Abstract

The present invention discloses a cable-type road piezoelectric energy harvesting device, characterized by comprising two parts: an energy conversion unit and an energy harvesting unit. The energy conversion unit comprises a piezoelectric unit, a flexible core shaft, and a shaped housing. The piezoelectric unit includes a piezoelectric body, a carrier, and a rectifier. The piezoelectric body is a fan-shaped structure with multiple arched piezoelectric blades evenly distributed around its circumference. The arched piezoelectric blades are mounted on a piezoelectric base, which contains a piezoelectric sheet embedded in the base. The energy harvesting unit includes a supercapacitor, a DC / DC converter, and a battery, which converts and stores the electrical energy generated by the energy conversion unit. This device can convert road pressure into electrical energy and has the advantages of being compact, highly efficient, and minimally destructive to roads.

Description

Technical Field

[0001] The present invention relates to the technical field of energy recovery, and in particular to a cable-type road surface pressure power generation device. Background Art

[0002] With the rapid development of social economy, energy demand has increased dramatically, and traditional energy reserves are becoming increasingly depleted. Energy recycling and reuse is an important way to solve the energy crisis. In recent years, the construction of the national road transportation system has been continuously improved. By the end of 2019, the total length of national highways reached 501.25×10 4 km. At the beginning of 2020, the national motor vehicle ownership reached 372 million. Such a huge road traffic system provides a huge energy source for the recycling and utilization of road energy, so road energy recovery technology has received widespread attention.

[0003] Existing road energy recovery devices with piezoelectric sheets as the core have developed into piezoelectric sheet stacking and array types, as well as integrated piezoelectric materials and road materials. They mainly use the positive piezoelectric effect of piezoelectric sheets to convert the pressure exerted by vehicles on the road surface into electrical energy. However, most of these energy recovery devices are large in size, complex to lay, and have poor flexibility. Improper installation can cause serious damage to the road surface. Summary of the Invention

[0004] In summary, the present invention has designed a cable-type road piezoelectric energy harvesting device with strong practicality and high energy collection efficiency. This device primarily utilizes a flexible mandrel, piezoelectric body, carrier, and two-stage energy storage element to improve the efficiency and practicality of road pressure energy recovery.

[0005] The present invention is implemented by adopting the following technical scheme: a cable-type pavement piezoelectric energy collection device, including two parts: energy conversion and energy collection; the energy conversion part includes a piezoelectric unit, a flexible core shaft, and a plastic shell; the energy conversion part adopts a flexible core shaft passing through the center of the piezoelectric unit, and a plastic shell wrapped in the outermost layer to connect multiple piezoelectric units and the flexible core shaft into one; the plastic shell is used to protect the energy conversion part and realize the positioning of the piezoelectric unit on the flexible core shaft; this structural design can make the energy conversion part bend and arrange at any angle in the horizontal plane, thereby improving the layout flexibility of the device; the energy collection part is used to convert and store the electric energy generated by the energy conversion part.

[0006] Furthermore, the piezoelectric unit includes a piezoelectric body, a carrier and a rectifier, and the piezoelectric body and the carrier are arranged alternately, and the rectifier is located between the carrier and the piezoelectric body; the piezoelectric body is deformed and emits electrical energy after being compressed; the carrier is used to bear part of the load transmitted from the ground to the energy conversion part, adjust the load-bearing deformation amplitude of the piezoelectric body, and avoid excessive deformation of the piezoelectric body; the rectifier is used to convert the alternating current generated by the compressive deformation of the piezoelectric body into direct current, and transmit it to the energy collection part.

[0007] Furthermore, the piezoelectric element is a fan-shaped structure, comprising an inner ring, an outer ring, and arched piezoelectric blades. Multiple arched piezoelectric blades are evenly spaced between the inner and outer rings. A piezoelectric base is mounted on the arched piezoelectric blades, which contains a piezoelectric chip. This structural design allows the device to remain operational even after the energy conversion unit is rotated to any angle within a circle and grounded, facilitating deployment.

[0008] Furthermore, the arched piezoelectric fan blade is elastic and can return to its original shape after the road pressure disappears; a piezoelectric piece base mounting groove is provided on the arched piezoelectric fan blade, and a piezoelectric piece base fixing groove is provided near the inner ring of the piezoelectric body, and a semi-cylindrical protrusion is provided near the outer ring of the piezoelectric body; the piezoelectric piece base is inserted into the piezoelectric piece base mounting groove from the side of the arched piezoelectric fan blade, and is positioned by the piezoelectric piece base fixing groove to form a cantilever beam structure; this structure can ensure that after the piezoelectric body is pressurized, the piezoelectric piece base in the piezoelectric piece base mounting groove is subjected to force vibration, thereby causing the piezoelectric piece to deform and generate current.

[0009] Furthermore, the piezoelectric film base is an elastic folded structure with a protrusion provided at the open end, and the piezoelectric film is embedded in the middle of the piezoelectric film base.

[0010] Furthermore, the piezoelectric sheets in each piezoelectric body in the piezoelectric unit are first connected in series and then in parallel, and then connected to the bus inside the flexible core shaft in a hybrid connection form, thereby improving the power output effect.

[0011] Furthermore, the energy collection part adopts a two-stage energy storage element. The first-stage energy storage element is a supercapacitor, which has the characteristics of high charge and discharge rate and long service life. The second-stage energy storage element is a battery, which has the characteristics of stable supply voltage. The second-stage energy storage elements work together to achieve the purpose of efficient collection and utilization of electrical energy.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The cable structure with a flexible core shaft allows the piezoelectric cable to be bent at any angle in the horizontal plane, improving the layout flexibility of the device.

[0014] 2. The fan-shaped piezoelectric structure with a piezoelectric plate base mounting groove is designed to ensure that the energy conversion part can be rotated to any angle within a circle and the device can remain in operation after being grounded, which facilitates the laying of the device. After being subjected to road pressure, the piezoelectric plates in the piezoelectric body in the working state can continue to vibrate and generate electricity, thereby improving the power generation capacity of the device.

[0015] 3. The bearing structure design can appropriately adjust the material stiffness of the bearing according to the road surface pressure and the mechanical properties of the road surface material, thereby improving the environmental adaptability of the device.

[0016] 4. The two-stage energy storage method of supercapacitor + battery is adopted to effectively improve the energy storage efficiency and stabilize the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of an implementation scheme of a cable-type road surface pressure power generation device in an example of the present invention.

[0018] Figure 2 This is a schematic structural diagram of the piezoelectric unit and the flexible core shaft in an example of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the piezoelectric body in the patent of this invention.

[0020] Figure 4 This is a schematic diagram of the structure of the piezoelectric plate base in the patent of this invention.

[0021] Figure 5 Schematic diagram of the force acting on the arched piezoelectric fan blade structure in the patent of this invention.

[0022] Figure 6 This is a schematic diagram of the road paving implementation plan of the cable-type road surface pressure power generation device in the patent of this invention.

[0023] The reference numerals are respectively

[0024] 1-energy conversion part, 2-piezoelectric unit, 3-flexible core shaft, 4-molded shell, 5-energy collection part, 6-piezoelectric body, 7-carrying body, 8-rectifier, 9-piezoelectric inner ring, 10-piezoelectric outer ring, 11-arched piezoelectric fan blade, 12-piezoelectric base mounting groove, 13-semi-cylindrical protrusion, 14-fixed seat, 15-piezoelectric base, 16-protrusion, 17-piezoelectric sheet, 18-horizontal wire hole, 19-first wire hole, 20-second wire hole, 21-bus hole, 22-bus, 23-wire, 24-asphalt pavement layer, 25-road base, 26-pavement, 27-lane line. DETAILED DESCRIPTION

[0025] The following is a detailed description of the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The described implementation is only used to explain the present invention, not to limit the present invention.

[0026] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a cable-type pavement piezoelectric energy collection device is proposed, which includes two parts: energy conversion and energy collection; the energy conversion part includes a piezoelectric unit 2, a flexible core shaft 3 and a plastic shell 4; the piezoelectric unit 2 includes a piezoelectric body 6, a carrier 7 and a rectifier 8, and the piezoelectric body 6 has a plurality of arched piezoelectric blades 11 distributed circumferentially, and a piezoelectric sheet base mounting groove 12 is provided on the arched piezoelectric blade 11, and a piezoelectric sheet base 15 is inserted into the piezoelectric sheet base mounting groove 12, and a piezoelectric sheet 17 is embedded in the piezoelectric sheet base 15; the energy collection part includes a supercapacitor, a DC / DC converter, and a battery; the energy collection part is connected to the end of the energy conversion part to convert and store the electric energy generated by the energy conversion part.

[0027] The energy conversion part 1 includes a piezoelectric unit 2, a flexible core shaft 3 and a plastic shell 4; the flexible core shaft 3 passes through the central mounting hole of the piezoelectric unit, and the piezoelectric units 2 are distributed at intervals on the flexible core shaft 3. The outer layer of the flexible core shaft 3 and the piezoelectric unit 2 is wrapped with a plastic shell 4; preferably, the flexible core shaft 3 is made of rubber material, and the plastic shell 4 is heat-shrinkable rubber; the flexible core shaft 3 can make the energy conversion part 1 be bent and arranged at any angle in the horizontal plane, and the plastic shell 4 is used to protect the energy conversion part 1 and fix the position of the piezoelectric unit 2 on the flexible core shaft 3.

[0028] Preferably, each piezoelectric unit 2 is provided with a rectifier 8, three piezoelectric bodies 6 and four carriers 7; in the piezoelectric unit 2, the carriers 7 and the piezoelectric bodies 6 are arranged alternately from left to right, the rectifier 8 is mounted on the inner ring at the left end of the first piezoelectric body, and the mounting hole diameter of the rectifier 8 is equal to the outer diameter of the inner ring 9 of the piezoelectric body; preferably, the piezoelectric body 6 is made of elastic spring steel, and the carrier 7 is a disc-shaped structure made of elastic rubber material. The carrier 7 is used to bear part of the vertical load transmitted from the ground to the energy conversion part 1, adjust the load deformation amplitude of the piezoelectric body 6, avoid excessive deformation of the piezoelectric body 6 and damage the piezoelectric sheet 17, and ensure that after the road pressure disappears, the piezoelectric body 6 and the carrier 7 return to their initial form. The rectifier 8 is used to gather the alternating current generated by the compressive deformation of the piezoelectric sheet 17 and convert it into direct current, which is then transmitted to the energy collection part 5.

[0029] like Figure 3As shown, the piezoelectric body 6 is a fan-blade structure, and each piezoelectric body 6 includes a piezoelectric inner ring 9, a piezoelectric outer ring 10 and an arched piezoelectric fan blade 11; preferably, eight arched piezoelectric fan blades 11 are arranged inside the piezoelectric body, and the arched piezoelectric fan blades 11 are evenly arranged along the circumference between the piezoelectric inner ring 9 and the piezoelectric outer ring 10, the piezoelectric inner ring 9 is in contact with the flexible core shaft 3, and the piezoelectric outer ring 10 is in contact with and fixed to the plastic shell 4; the inner diameter of the piezoelectric inner ring 9 and the carrier 7 is equal to the size of the central mounting hole of the piezoelectric unit 2, and the outer diameter of the piezoelectric outer ring 10 is equal to the outer diameter of the carrier 7.

[0030] A piezoelectric base mounting groove 12 is provided inside the arched piezoelectric fan blade 11, and the piezoelectric base mounting groove 12 includes a semi-cylindrical protrusion 13 and a fixing seat 14, and two symmetrical fixing grooves are provided on the fixing seat 14; the semi-cylindrical protrusion 13 is located on the inner wall of the piezoelectric base mounting groove 12, and the specific position is corresponding to the convex side end of the piezoelectric base 15, and the fixing seat 14 is located inside the piezoelectric base mounting groove 12 near the inner ring 9 of the piezoelectric body.

[0031] like Figure 4 As shown, as a preferred embodiment, the piezoelectric base 15 and the piezoelectric plate 17 are arch-shaped, and the piezoelectric base 15 is an elastic folded structure. The piezoelectric plate 17 is embedded in the middle of the piezoelectric base 15, and protrusions 16 are respectively provided on both sides of the open end of the piezoelectric base 15. After the open end of the piezoelectric base 15 is pressed and closed, the protrusions 16 are inserted into the piezoelectric base mounting groove 12 along the fixing groove on the fixing base 14. The fixing base 14 and the piezoelectric base 15 are assembled in an interference fit, which serves to fix the position of the piezoelectric base 15; a certain gap is reserved between the end of the piezoelectric base 15 and the piezoelectric base mounting groove 12.

[0032] like Figure 5 As shown in FIG, there are three stress states of the arched piezoelectric fan blade 11. Figure 5 As shown in (a), the arched piezoelectric fan blade 11 is in a free state without any force. At this time, there is a certain gap between the piezoelectric base 15 and the semi-cylindrical protrusion 13 and the wall of the piezoelectric base installation groove 12, ensuring that the piezoelectric base 15 can vibrate freely inside the piezoelectric base installation groove 12. Figure 5 As shown in (b), the convex end of the arched piezoelectric fan blade 11 bends in the clockwise direction after being subjected to pressure, and then the piezoelectric base 15 bends clockwise under the action of the semi-cylindrical protrusion 13, causing the piezoelectric piece 17 to bend clockwise. When the pressure disappears, the piezoelectric base mounting groove 12 returns to its initial shape, and the piezoelectric base 15 performs cantilever beam attenuation vibration inside the piezoelectric base mounting groove 12, causing the piezoelectric piece 17 to continuously vibrate and deform to generate alternating current; Figure 5As shown in (c), the concave end of the arched piezoelectric blade 11 bends counterclockwise when pressure is applied, and the sides of the piezoelectric base mounting groove 12 tend to straighten, thereby maintaining the piezoelectric base 15 away from the semi-cylindrical protrusion 13 and maintaining its initial shape, preventing the piezoelectric plate 17 from deforming. The above-mentioned structure of the piezoelectric base mounting groove 12 and the stress-deformed state of the arched piezoelectric blade 11 ensure that the piezoelectric plate 17 in the working state continues to vibrate and generate alternating current after the piezoelectric body 6 is compressed, thereby improving the piezoelectric energy collection effect.

[0033] like Figure 2 As shown, a horizontal wire hole 18 is provided on the carrier 7 inside the piezoelectric unit 2 near the flexible core shaft 3; two first wire holes 19 are provided on the piezoelectric inner ring 9 of the piezoelectric body 6 located at the left end of the piezoelectric unit 2, and the two first wire holes 19 are arranged on opposite sides; two bus holes 21 are provided in the flexible core shaft 3, and second wire holes 20 are provided on the flexible core shaft 3 at positions corresponding to the two first wire holes 19 and connected to the bus holes 21 in the flexible core shaft 3; the three piezoelectric sheets 17 at the same horizontal position on the three piezoelectric bodies 6 inside the piezoelectric unit 2 are first connected in series into a group through the wire 23 and the corresponding horizontal wire holes 18, and then connected to the rectifier 8 for rectification, and then the eight groups of piezoelectric sheets 17 in series are connected in parallel to the bus 22 in the flexible core shaft 3 through the wire 23 and the first wire holes 19 and the second wire holes 20, forming a hybrid connection circuit, and the electric energy is transmitted to the energy collection part 5 through the bus 22 in the flexible core shaft 3 for conversion and storage, thereby improving the efficiency of electric energy recovery.

[0034] like Figure 6 As shown, the energy conversion part 1 is placed between the asphalt pavement layer 24 and the road base layer 25 in a serpentine paving manner, and the serpentine paving spacing of the energy conversion part 1 can be set according to the road traffic volume and speed conditions to improve the energy collection efficiency of the energy conversion part 1.

[0035] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A cable-type road piezoelectric energy harvesting device, characterized by: The invention comprises two parts: energy conversion and energy collection; the energy conversion part (1) comprises a piezoelectric unit (2), a flexible core shaft (3), and a shaped shell (4); the energy conversion part (1) adopts a structural form in which the flexible core shaft (3) passes through the center of the piezoelectric unit (2) and is wrapped with the shaped shell (4) in the outermost layer, so as to connect a plurality of piezoelectric units (2) and the flexible core shaft (3) into one, and the flexible core shaft (3) enables the energy conversion part (1) to be bent and arranged at any angle in a horizontal plane; the shaped shell (4) is used to protect the energy conversion part and realize the positioning of the piezoelectric unit (2) on the flexible core shaft (3); the energy collection part (5) is used to convert and store the electric energy generated by the energy conversion part (1), and the piezoelectric unit (2) comprises a piezoelectric body (6), a carrier (7), and a rectifier (8), and the carrier (7) and the piezoelectric body (6) are arranged alternately from left to right. The rectifier (8) is located between the carrier (7) and the piezoelectric body (6); the piezoelectric body (6) is deformed and emits electrical energy after being compressed; the carrier (7) is used to bear part of the load transmitted from the ground to the energy conversion part (1), adjust the load deformation amplitude of the piezoelectric body (6), and avoid excessive deformation of the piezoelectric body (6); the rectifier (8) is used to convert the alternating current generated by the compression deformation of the piezoelectric body (6) into direct current, and transmit it to the energy collection part; the piezoelectric body (6) is a fan-shaped structure, including a piezoelectric inner ring (9), a piezoelectric outer ring (10) and an arched piezoelectric fan blade (11); a plurality of arched piezoelectric fan blades (11) are evenly arranged between the piezoelectric inner ring (9) and the piezoelectric outer ring (10); the rectifier (8) is sleeved on the piezoelectric inner ring (9) of the first piezoelectric body, and the diameter of the mounting hole of the rectifier (8) is equal to the outer diameter of the piezoelectric inner ring (9); A piezoelectric base (15) is installed on the electric fan blade (11), and a piezoelectric piece (17) is embedded in the piezoelectric base (15). The arched piezoelectric fan blade (11) is elastic and can return to its initial shape after the road pressure disappears; a piezoelectric base mounting groove (12) is provided on the arched piezoelectric fan blade (11), and a piezoelectric base fixing groove is provided near the piezoelectric inner ring (9) of the piezoelectric base mounting groove (12), and a semi-cylindrical protrusion (13) is provided near the piezoelectric outer ring (10); the piezoelectric base (15) is inserted into the piezoelectric base mounting groove (12) from the side of the arched piezoelectric fan blade, and is positioned by the piezoelectric base fixing groove to form a cantilever beam structure; this structure can ensure that after the piezoelectric body is compressed, the piezoelectric base (15) in the piezoelectric base mounting groove (12) is subjected to force vibration, thereby causing the piezoelectric piece (17) to deform and generate current.

2. The cable-type road piezoelectric energy harvesting device according to claim 1, characterized in that: The piezoelectric plate base (15) is an elastic folded structure, with a protrusion (16) provided at the open end thereof, and the piezoelectric plate (17) is embedded in the middle of the piezoelectric plate base (15).

3. A cable-type road piezoelectric energy harvesting device according to claim 1 or 2, characterized in that: The piezoelectric sheets (17) in each piezoelectric body (6) in the piezoelectric unit (2) are first connected in series and then in parallel, and then connected to the bus (22) inside the flexible core shaft (3) in a hybrid connection form, thereby improving the power output effect.

4. A cable-type road piezoelectric energy harvesting device according to claim 1 or 2, characterized in that: The energy collection part (5) adopts a two-stage energy storage element, wherein the first-stage energy storage element is a super capacitor and the second-stage energy storage element is a battery, thereby improving the energy storage efficiency and stabilizing the output voltage.

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