Self-generating seat for a truck
By installing a vibration conversion device in the truck seat, the truck's vibration energy is converted into electrical energy, solving the problems of brittleness and insufficient energy harvesting of traditional piezoelectric ceramic sheets, and achieving efficient energy utilization and safe storage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN ISRING HUATAI AUTO SEAT
- Filing Date
- 2025-07-10
- Publication Date
- 2026-06-19
Smart Images
Figure CN224375416U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle seat technology, and in particular to a self-generating seat for trucks. Background Technology
[0002] Low-carbon and environmentally friendly practices are increasingly becoming the theme of modern life, making the acquisition of electricity in an environmentally friendly and energy-efficient manner ever more important. Chairs are indispensable in our daily lives, whether at home or traveling. However, traditional chairs have limited functionality. To improve the harvesting and utilization of energy from nature, related technologies have been developed that incorporate piezoelectric ceramics into traditional chairs, enabling convenient and quick energy harvesting.
[0003] However, for seats equipped with piezoelectric ceramics, the piezoelectric ceramic sheets are often placed under the seat cushion to collect the energy from when the passenger sits down or gets up, and convert this energy into electrical energy. The drawback of such seats is that piezoelectric ceramics are relatively brittle and have low tensile strength. With long-term use, stress may accumulate inside the plate-like or film-like layered piezoelectric material, thus reducing its service life. Although the energy from when the passenger sits down or gets up can be converted into electrical energy, the frequency of sitting down or getting up is not high enough, so the amount of energy collected is small, which greatly reduces the practicality. Utility Model Content
[0004] This application provides a self-generating seat for trucks that reduces the accumulation of internal stress.
[0005] The technical solution provided in this application for a self-generating seat for trucks is as follows:
[0006] The seat body includes a seat portion, a backrest connected to the seat portion, and a shock-absorbing structure disposed at the bottom of the seat portion. The seat portion includes a seat frame, and the seat body is capable of reciprocating motion along the vertical direction.
[0007] The vibration conversion device includes multiple piezoelectric unit groups connected in parallel around the periphery of the seat frame, each piezoelectric unit group including multiple stacked and connected piezoelectric sheets; and
[0008] An energy harvesting device is provided on the backrest and electrically connected to the vibration conversion device. The energy harvesting device is used to collect the electrical energy output by the vibration conversion device.
[0009] By adopting the above technical solution, the shock absorption structure converts the random vibration energy during truck driving into the energy of the seat body reciprocating vertically; the vibration conversion device partially converts the energy of the seat body reciprocating vertically into electrical energy through the piezoelectric effect, and stores it through the energy collection device, thereby recovering some waste energy and improving energy utilization efficiency; the piezoelectric unit group is set around the periphery of the seat frame, thus not occupying additional space and adapting to the compact layout of the truck cab, while the periphery of the seat frame has a larger vibration amplitude than the center of the seat frame, thereby making the piezoelectric unit group utilize vibration energy more efficiently; multiple piezoelectric sheets are stacked and connected in series to form the piezoelectric unit group, thereby increasing the output voltage of the piezoelectric sheets, and multiple piezoelectric unit groups are connected in parallel to the energy collection device, thereby increasing the output current of the vibration conversion device to transmit electrical energy more efficiently.
[0010] Optionally, the energy harvesting device includes a DC-DC voltage converter and a lithium battery. The DC-DC voltage converter is disposed on the backrest, and a seat armrest is connected to the backrest. The lithium battery is disposed inside the seat armrest and is electrically connected to the DC-DC voltage converter. A power output port is provided on the seat armrest.
[0011] By adopting the above technical solution, the DC-DC voltage converter converts the unstable current output by the piezoelectric element into a stable DC current suitable for the lithium battery storage, thereby improving energy storage efficiency and safety; the lithium battery is installed inside the seat armrest, optimizing the spatial layout of the energy collection device; the power output socket is provided on the seat armrest, which conforms to the driver's operating habits and improves ease of use.
[0012] Optionally, the energy harvesting device further includes a diode rectifier bridge module, which is electrically connected to a DC-DC voltage converter and electrically connected to a piezoelectric unit group.
[0013] By adopting the above technical solution, the diode rectifier bridge module converts the AC power output by the piezoelectric sheet vibration into unidirectional DC power, providing DC power suitable for the operation of the DC-DC converter and lithium battery charging.
[0014] Optionally, the vibration conversion device further includes a protective housing, which is connected to the lower surface of the periphery of the seat frame, and the piezoelectric unit group is disposed inside the protective housing and moves relative to the inner surface of the protective housing.
[0015] By adopting the above technical solution, the protective shell isolates the piezoelectric unit assembly from external environmental interference, thereby extending the service life of the piezoelectric unit assembly. The piezoelectric unit assembly can move relative to the inner surface of the protective shell, thereby avoiding a rigid connection between the piezoelectric element and the protective shell, which would cause fatigue and excessive stress accumulation at the connection point under high-frequency vibration. At the same time, the protective shell restricts the vibration direction of the piezoelectric element, so that the piezoelectric element mainly vibrates along the axial direction and bears axial pressure, thereby improving the utilization rate of vibration energy. The protective shell is connected to the lower surface of the periphery of the seat frame, so that the protective shell directly receives the vibration energy of the seat body and transmits it to the piezoelectric element inside, reducing the attenuation of vibration energy during transmission.
[0016] Optionally, elastic protective film layers are respectively provided on the two opposite surfaces of the piezoelectric unit group, and the side of the piezoelectric unit group is clearance-fitted with the inner surface of the protective housing.
[0017] By adopting the above technical solution, the elastic protective film layer buffers the deformation stress of the piezoelectric sheet under high-speed vibration and buffers the impact of collision with the end face of the protective shell; through the clearance fit between the side of the piezoelectric unit group and the inner surface of the protective shell, the piezoelectric unit group is allowed to swing slightly within the protective shell and move relative to the protective shell, avoiding hard friction between the piezoelectric unit group and the protective shell and reducing energy loss due to friction.
[0018] Optionally, the piezoelectric element is circular; or
[0019] The piezoelectric sheet is rectangular, and the corners of the piezoelectric sheet are rounded.
[0020] By adopting the above technical solutions, the piezoelectric sheet is circular, eliminating stress concentration points at the corners and making the piezoelectric sheet deform evenly when subjected to force; or the piezoelectric sheet is rectangular, with rounded corners, thereby reducing stress concentration points at the corners of the piezoelectric sheet.
[0021] Optionally, an elastic sheet is abutted against the surface of the piezoelectric sheet, and the elastic sheet is arranged radially along the surface of the piezoelectric sheet.
[0022] By adopting the above technical solution, the elastic sheet is arranged radially along the surface of the piezoelectric sheet, thereby providing a certain elastic support and restoring force when the piezoelectric sheet vibrates, so that the piezoelectric sheet can more effectively convert vibration energy; the elastic sheet prevents the piezoelectric sheet from being damaged due to excessive deformation.
[0023] Optionally, the elastic sheets disposed on adjacent piezoelectric sheets are staggered angularly, and the projections of the elastic sheets that abut against two opposite surfaces of the same piezoelectric sheet are offset from each other.
[0024] By adopting the above technical solution, the pressure on the upper and lower surfaces of the same piezoelectric sheet is staggered, thereby making full use of the charge inside the piezoelectric sheet; the elastic sheets are staggered along the angular direction, and the piezoelectric sheets are fitted with the protective shell with gaps, so that when the piezoelectric sheet is subjected to torque during vibration and generates a rotational tendency, the staggered elastic sheets, through mutual compression, convert the rotational kinetic energy of the piezoelectric sheet into the elastic potential energy and elastic deformation of the elastic sheets, avoiding the torque from acting directly on the inside of the piezoelectric sheet, thereby reducing the accumulation of stress inside the piezoelectric sheet.
[0025] Optionally, the inner surface of the protective housing is provided with a sliding groove, and the two ends of the protective housing are provided with counterweights, which cooperate with the sliding groove to slide.
[0026] By adopting the above technical solution, the counterweight plate slides inside the protective housing in conjunction with the sliding groove. When the seat body vibrates, the counterweight plate lags behind the piezoelectric unit group due to inertia, thereby applying an external force to the piezoelectric unit group. The sliding groove limits the movement direction of the counterweight plate, making it consistent with the vertical reciprocating movement direction of the seat body. Thus, the counterweight plate only applies pressure to the piezoelectric unit group, thereby improving the conversion efficiency of the vibration energy of the seat body.
[0027] Optionally, the end face of the counterweight away from the piezoelectric piece abuts against a limiting ring, and an annular recess is formed in the middle of the limiting ring. The annular recess cooperates with the end face of the protective housing to realize the movable connection between the limiting ring and the protective housing.
[0028] By adopting the above technical solution, the limiting ring adjusts the distance between the counterweight and the piezoelectric sheet, thereby adjusting the external force on the piezoelectric sheet, so that the piezoelectric sheet can improve the efficiency of vibration energy conversion while avoiding damage; the limiting ring can adjust the counterweight to abut against the piezoelectric unit group, thereby applying a pre-tightening force to the piezoelectric unit group during the debugging of the vibration conversion device, reducing the gap between the piezoelectric sheet, the elastic sheet and the elastic protective film layer, so as to increase the reliability and tightness of the vibration conversion device.
[0029] In summary, this application includes at least one of the following beneficial technical effects:
[0030] 1. The vibration energy of the seat body is partially converted into electrical energy by the vibration conversion device and stored by the electrical energy collection device electrically connected to the vibration conversion device, thereby effectively utilizing waste energy, saving energy and protecting the environment;
[0031] 2. By using elastic sheets arranged radially and angularly on the piezoelectric sheet, the torque is prevented from acting directly on the inside of the piezoelectric sheet. By providing elastic protective film layers on the opposite two surfaces of the piezoelectric unit group, the impact of the protective shell on the piezoelectric unit group is buffered, thereby reducing the stress accumulation inside the piezoelectric sheet and preventing the piezoelectric sheet from breaking due to its high brittleness.
[0032] 3. By using the limiting ring, during the debugging of the vibration conversion device, the counterweight plate is adjusted to abut against the piezoelectric unit group, reducing the gap between the piezoelectric plate, the elastic plate, and the elastic protective film layer, thereby increasing the reliability and tightness of the vibration conversion device. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the overall structure of a self-generating seat for a truck according to one embodiment of this application;
[0034] Figure 2 This is a partial cross-sectional view of a self-generating seat for a truck according to one embodiment of this application;
[0035] Figure 3 This is a schematic diagram of the overall structure of the piezoelectric unit group in one embodiment of this application;
[0036] Figure 4 yes Figure 3 Sectional view of AA;
[0037] Figure 5 This is a schematic diagram of the structure of the piezoelectric sheet in one embodiment of this application;
[0038] Figure 6 yes Figure 5 Top view;
[0039] Figure 7 yes Figure 5 A bottom view;
[0040] Figure 8 This is a schematic diagram of another shape of the piezoelectric sheet in one embodiment of this application;
[0041] Figure 9 yes Figure 8 Top view;
[0042] Figure 10 yes Figure 8 A bottom view.
[0043] Explanation of reference numerals in the attached figures:
[0044] 1. Seat body; 11. Seat section; 111. Seat frame; 12. Backrest; 121. Seat armrest; 122. Power output socket; 13. Shock absorption structure; 2. Vibration conversion device; 21. Piezoelectric unit group; 211. Piezoelectric sheet; 22. Protective shell; 221. Slide groove; 23. Elastic protective film layer; 24. Elastic sheet; 25. Counterweight; 26. Limiting ring; 3. Energy harvesting device; 31. DC-DC voltage converter; 32. Lithium battery; 33. Diode rectifier bridge module. Detailed Implementation
[0045] The present application will be further described in detail below with reference to all the accompanying drawings.
[0046] The seat body 1 will reciprocate vertically due to the transmission of truck vibrations. The possible scenarios in which the truck vibrates are as follows:
[0047] Trucks are used for long-distance transportation or travel on complex road conditions. When a truck travels on an uneven road surface, the road surface will generate irregular impacts on the truck tires. The impact is transmitted to the truck's suspension system and buffered by the suspension system. However, since trucks usually carry heavy loads and the stiffness of the commonly used leaf spring system is usually relatively high, some high-frequency vibrations are still transmitted to the seat body 1 located inside the truck. The seat body 1 elastically buffers the high-frequency vibrations through the shock absorption structure 13 and converts them into the kinetic energy of the seat body 1 reciprocating in the vertical direction.
[0048] At the same time, the truck's power system needs to perform periodic mechanical movements, which in turn generate periodic mechanical vibrations. Since the truck's power system usually outputs a large amount of power, it generates periodic mechanical vibrations in the truck and transmits them to the seat body 1.
[0049] Please see Figure 1-2 A self-generating seat for a truck provided in this application embodiment includes a seat body 1, a vibration conversion device 2, and an energy harvesting device 3. The seat body 1 can reciprocate along the vertical direction. The vibration conversion device 2 is disposed around the seat frame 111 to convert the vibration energy of the seat body 1 into electrical energy. The energy harvesting device 3 is disposed on the backrest 12 and electrically connected to the vibration conversion device 2 to collect the electrical energy output by the vibration conversion device 2, thereby realizing the recovery and utilization of part of the vibration energy of the seat body 1.
[0050] Specifically, the seat body 1 includes a seat portion 11, a backrest 12 connected to the seat portion 11, and a shock-absorbing structure 13 disposed at the bottom of the seat portion 11. The seat portion 11 includes a seat frame 111. The seat frame 111 is generally made of metal, which has high strength and stability, but it can also be made of other materials such as high-strength plastic. The backrest 12 and the seat portion 11 can be fixedly connected together by welding, bolting, or other methods to ensure the stability of the connection. The shock-absorbing structure 13 can be a common shock-absorbing spring or a hydraulic shock-absorbing device, installed at the bottom of the seat portion 11. When the truck vibrates while driving, the shock-absorbing structure 13 reduces the impact of vibration on the seat through elastic deformation or fluid compression, while converting the random vibration energy of the truck into the energy of the seat body 1 reciprocating motion in the vertical direction.
[0051] The vibration conversion device 2 includes multiple piezoelectric unit groups 21 connected in parallel around the periphery of the frame 111. Each piezoelectric unit group 21 includes multiple piezoelectric sheets 211 stacked and connected in series. The protective housing 22 of each piezoelectric unit group 21 is fixed to the periphery of the frame 111 by welding, screwing, or other methods. For example, a limiting ring 26 is welded around the periphery of the frame 111. The annular recessed surface of the limiting ring 26 is threaded, and the surfaces of the protective housing 22 near its two ends are provided with matching threads. Thus, the protective housing 22 fixes the vibration conversion device 2 by screwing one end of it to the limiting ring 26; the other end of the protective housing 22 is screwed to another limiting ring 26 to limit the piezoelectric unit group 21, the elastic sheet 24, and the counterweight 25. The piezoelectric sheets 211 are usually made of materials with piezoelectric effect. In this embodiment, the piezoelectric sheets 211 are made of PZT piezoelectric ceramic material. Since the mass of the piezoelectric unit group 21 is much smaller than the mass of the seat body 1, its inertia is small, and its response to vibration lags behind that of the seat body 1, thus creating a motion phase difference between the two.
[0052] Specifically, when the seat body 1 moves upward, the piezoelectric unit group 21 temporarily maintains its original position due to inertia, causing the seat body 1 to exert a downward pulling force on it; when the seat body 1 moves downward, the piezoelectric unit group 21 lags behind due to inertia and is subjected to an upward pushing force. This phase difference in motion causes the piezoelectric unit group 21 to be continuously subjected to the forced force applied by the seat body 1, and the direction of the forced force changes with the vibration period. In order to maximize the utilization of vibration energy, the piezoelectric sheet 211 is polarized along its thickness direction, and the forced force in the vertical direction causes the piezoelectric sheet 211 to undergo compression or stretching deformation along the thickness direction, changing the arrangement of the electric dipoles inside the piezoelectric sheet 211, and generating charges on the upper and lower surfaces of the piezoelectric sheet 211.
[0053] Specifically, when the piezoelectric element 211 is compressed, positive charges accumulate on its upper surface and negative charges accumulate on its lower surface; when the piezoelectric element 211 is stretched, the charge polarity reverses, the upper surface becomes negatively charged, and the lower surface becomes positively charged. Because the seat body 1 reciprocates vertically, the direction of the forced force on the piezoelectric element 211 is periodically reversed, causing the polarity and magnitude of the charge on the surface of the piezoelectric element 211 to change periodically with the vibration frequency, forming an alternating electric field, which is electrically connected to the energy harvesting device 3 through the piezoelectric unit group 21 to transport the charge on the surface of the piezoelectric element 211.
[0054] Multiple piezoelectric elements 211 are stacked and connected in series to form a piezoelectric unit group 21, thereby increasing the output voltage of the piezoelectric elements 211. Multiple piezoelectric unit groups 21 are connected in parallel to the energy harvesting device 3, thereby increasing the output current of the vibration conversion device 2 for more efficient energy transmission. In this embodiment, one piezoelectric unit group 21 consists of ten stacked and connected circular piezoelectric elements 211, and multiple identical piezoelectric unit groups 21 are connected in parallel and symmetrically arranged on both sides of the periphery of the frame 111.
[0055] An energy harvesting device 3 is installed on the backrest 12 and electrically connected to the vibration conversion device 2, for collecting the electrical energy output by the vibration conversion device 2. The energy harvesting device 3 includes a diode rectifier bridge module 33, a DC-DC voltage converter 31, and a lithium battery 32.
[0056] Specifically, the diode rectifier bridge module 33 is electrically connected to the DC-DC voltage converter 31 and the piezoelectric unit group 21, respectively, and converts the AC power output by the piezoelectric element 211 into unidirectional DC power, providing suitable DC power for DC-DC conversion and charging of the lithium battery 32. The DC-DC voltage converter 31 is located on the backrest 12, and further converts the unstable current output by the piezoelectric element 211, which has been converted into unidirectional DC power by the diode rectifier bridge module 33, into stable DC power suitable for storage by the lithium battery 32. A seat armrest 121 is connected to the backrest 12. The lithium battery 32 is located inside the seat armrest 121 and is electrically connected to the DC-DC voltage converter 31. A power output socket 122 is provided on the seat armrest 121. The lithium battery 32 is used to store the collected electrical energy, and the power output socket 122 allows the driver to use the collected electrical energy, such as to charge electronic devices like mobile phones and tablets.
[0057] Please see Figure 3-4The vibration conversion device 2 also includes a protective housing 22, which is connected to the lower surface of the periphery of the seat frame 111. The piezoelectric unit group 21 is disposed inside the protective housing 22 and moves relative to the inner surface of the protective housing 22. The protective housing 22 can be made of a rigid material, such as engineering plastic, to protect the piezoelectric unit group 21 and prevent damage from external dust, moisture, etc. Elastic protective film layers 23 are respectively provided on the two opposite surfaces of the piezoelectric unit group 21. The elastic protective film layers 23 can be made of a flexible material, such as rubber or epoxy resin, to protect the piezoelectric sheet 211 and buffer some external impact forces. The side of the piezoelectric unit group 21 is clearance-fitted with the inner surface of the protective housing 22, allowing the piezoelectric unit group 21 to swing slightly within the protective housing 22 and move relative to the protective housing 22, avoiding hard friction between the piezoelectric unit group 21 and the protective housing 22, and reducing energy loss due to friction.
[0058] Please see Figure 5-7 This is one embodiment of the piezoelectric sheet 211 shape. The piezoelectric sheet 211 is circular, and an elastic sheet 24 is tightly abutted against its surface. The elastic sheet 24 is arc-shaped and extends radially along the surface of the piezoelectric sheet 211. The two ends of each elastic sheet 24 point to the center and edge of the piezoelectric sheet 211, respectively, so that the elastic sheets 24 disposed on the surface of the piezoelectric sheet 211 are radially distributed. The circular shape of the piezoelectric sheet 211 eliminates stress concentration points at the corners, making the deformation of the piezoelectric sheet 211 uniform when subjected to force. The elastic sheet 24 can be made of elastic material, such as rubber or silicone.
[0059] Please see Figure 6-7 The projections of the elastic sheets 24 that abut against the two opposite surfaces of the same piezoelectric sheet 211 are offset from each other on the plane. That is, the gap between two radially adjacent elastic sheets 24 on the upper surface of the piezoelectric sheet 211 can accommodate the corresponding elastic sheet 24 on the lower surface of another piezoelectric sheet 211. In other words, the elastic sheets 24 on the upper surface of the piezoelectric sheet 211 and the elastic sheets 24 on the lower surface of another piezoelectric sheet 211 are completely offset in the radial direction. Therefore, the forcing force transmitted to the upper and lower surfaces of the same piezoelectric sheet 211 acts alternately on the surface of the piezoelectric sheet 211 in the radial direction, thereby making the pressure distribution on the piezoelectric sheet 211 more uniform, so that the deformation of the piezoelectric sheet 211 is uniform and stress accumulation is reduced.
[0060] The elastic sheets 24 on adjacent piezoelectric sheets 211 can be staggered in the angular direction. For example, the elastic sheets 24 on the upper piezoelectric sheet 211 can be arranged along the 0° and 90° directions, while the elastic sheets 24 on the lower piezoelectric sheet 211 can be arranged along the 45° and 135° directions. Thus, when the piezoelectric sheet 211 is subjected to torque during vibration and exhibits a rotational tendency, the staggered elastic sheets 24, through mutual compression, convert the rotational kinetic energy of the piezoelectric sheet 211 into the elastic potential energy and elastic deformation of the elastic sheets 24, preventing the torque from acting directly on the interior of the piezoelectric sheet 211, thereby reducing the accumulation of internal stress.
[0061] Please see Figure 8-10 This is another embodiment of the shape of the piezoelectric sheet 211. The piezoelectric sheet 211 is rectangular, and the corners of the piezoelectric sheet 211 are rounded. The rounded corners of the piezoelectric sheet 211 reduce stress concentration points; since the piezoelectric sheet 211 is rectangular, the elastic sheet 24 changes accordingly according to the shape of the piezoelectric sheet 211. The side of the elastic sheet 24 near the edge of the piezoelectric sheet 211 is square, corresponding to the edge shape of the piezoelectric sheet 211, and the side of the elastic sheet 24 near the center of the piezoelectric sheet 211 is arc-shaped.
[0062] In other embodiments, the piezoelectric sheet 211 can be a geometric shape that is symmetrical about the center and has rounded corners. Of course, considering the difficulty of processing and the brittleness of the piezoelectric sheet 211 itself, it is better to have a simple shape in the geometric shape formed by the piezoelectric sheet 211.
[0063] In this embodiment, the protective housing 22 is cylindrical to accommodate the circular piezoelectric sheet 211. In other embodiments, the protective housing 22 may be square to accommodate the rectangular piezoelectric sheet 211. In other embodiments, the protective housing 22 may be elongated rectangular and have internal partitions to form multiple separate regions. Multiple sets of piezoelectric unit groups 21 may be simultaneously disposed inside the same protective housing 22 to make the piezoelectric unit groups 21 more compactly distributed in space.
[0064] A groove 221 is formed on the inner surface of the protective housing 22, and counterweights 25 are provided at both ends of the protective housing 22. The counterweights 25 cooperate with the groove 221 to slide. The counterweights 25 are generally made of a high-density metal material. When the seat vibrates, the counterweights 25 slide in the groove 221, increasing the amplitude and frequency of the vibration, thereby improving the power generation efficiency of the piezoelectric unit group 21. The end face of the counterweight 25 away from the piezoelectric piece 211 abuts against a limiting ring 26. An annular recess is formed in the middle of the limiting ring 26, which cooperates with the end face of the protective housing 22 to achieve a movable connection between the limiting ring 26 and the protective housing 22. The limiting ring 26 adjusts the distance between the counterweight 25 and the piezoelectric plate 211, thereby adjusting the external force on the piezoelectric plate 211, so that the piezoelectric plate 211 can improve the efficiency of vibration energy conversion while avoiding damage. The limiting ring 26 can adjust the counterweight 25 to abut against the piezoelectric unit group 21, thereby applying a pre-tightening force to the piezoelectric unit group 21 during the commissioning of the vibration conversion device 2, reducing the gap between the piezoelectric plate 211, the elastic plate 24 and the elastic protective film layer 23, so as to increase the reliability and tightness of the vibration conversion device 2.
[0065] The implementation principle of a self-generating seat for trucks according to an embodiment of this application is as follows: The seat body 1 converts the random vibration energy of the truck during driving into energy for reciprocating motion in the vertical direction through the shock-absorbing structure 13. When the seat body 1 reciprocates in the vertical direction, since the mass of the piezoelectric unit group 21 is much smaller than that of the seat body 1, the motion of the piezoelectric unit group 21 has a phase delay relative to the motion of the seat body 1. That is, during the vibration of the seat body 1, the seat body 1 applies a forcing force to the piezoelectric unit group 21, causing the piezoelectric unit group 21 to follow it in reciprocating motion in the vertical direction. Due to the forcing force acting on the piezoelectric unit group 21, the piezoelectric sheet 211 deforms, and charges are generated inside it through the piezoelectric effect, which are then transported to the energy harvesting device 3. The driver uses the electrical energy stored in the energy harvesting device 3 through the power output socket 122 provided on the seat armrest 121.
[0066] When the piezoelectric sheet 211 is subjected to torque and has a tendency to rotate, the interlocking elastic sheets 24 convert the rotational kinetic energy of the piezoelectric sheet 211 into the elastic potential energy and deformation of the elastic sheets 24 by mutual compression, thus preventing the torque from acting directly on the interior of the piezoelectric sheet 211.
[0067] During the commissioning of the vibration conversion device 2, the limiting ring 26 can adjust the counterweight 25 to abut against the piezoelectric unit group 21, apply a pre-tightening force to the piezoelectric unit group 21, reduce the gap between the piezoelectric sheet 211, the elastic sheet 24 and the elastic protective film layer 23, thereby increasing the reliability and tightness of the vibration conversion device 2. During the operation of the vibration conversion device 2, the limiting ring 26 adjusts the distance between the counterweight 25 and the piezoelectric sheet 211, thereby adjusting the external force on the piezoelectric sheet 211, so that the piezoelectric sheet 211 can improve the efficiency of vibration energy conversion while avoiding damage.
[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A self-generating seat for a truck, characterized in that, include: The seat body (1) includes a seat part (11), a backrest (12) connected to the seat part (11), and a shock-absorbing structure (13) disposed at the bottom of the seat part (11). The seat part (11) includes a seat frame (111). The seat body (1) can reciprocate along the vertical direction. The vibration conversion device (2) includes a plurality of piezoelectric unit groups (21) connected in parallel around the periphery of the seat frame (111), each of the piezoelectric unit groups (21) including a plurality of piezoelectric sheets (211) stacked in series; and An energy collection device (3) is provided on the backrest (12) and electrically connected to the vibration conversion device (2). The energy collection device (3) is used to collect the electrical energy output by the vibration conversion device (2).
2. The self-generating seat for a truck according to claim 1, characterized in that: The energy harvesting device (3) includes a DC-DC voltage converter (31) and a lithium battery (32). The DC-DC voltage converter (31) is disposed on the backrest (12). A seat armrest (121) is connected to the backrest (12). The lithium battery (32) is disposed inside the seat armrest (121) and is electrically connected to the DC-DC voltage converter (31). A power output socket (122) is provided on the seat armrest (121).
3. A self-generating seat for a truck according to claim 2, characterized in that: The energy harvesting device (3) further includes a diode rectifier bridge module (33), which is electrically connected to the DC-DC voltage converter (31) and electrically connected to the piezoelectric unit group (21).
4. A self-generating seat for a truck according to claim 1, characterized in that: The vibration conversion device (2) further includes a protective housing (22), which is connected to the lower surface of the periphery of the seat frame (111). The piezoelectric unit group (21) is disposed inside the protective housing (22) and moves relative to the inner surface of the protective housing (22).
5. A self-generating seat for a truck according to claim 4, characterized in that: The piezoelectric unit group (21) has elastic protective film layers (23) on its two opposite surfaces, and the side of the piezoelectric unit group (21) is fitted with the inner surface of the protective shell (22) with a clearance.
6. A self-generating seat for a truck according to claim 5, characterized in that: The piezoelectric element (211) is circular; or The piezoelectric sheet (211) is rectangular, and the corners of the piezoelectric sheet (211) are rounded.
7. A self-generating seat for a truck according to claim 6, characterized in that: The surface of the piezoelectric sheet (211) is abutted by an elastic sheet (24), which is arranged radially along the surface of the piezoelectric sheet (211).
8. A self-generating seat for a truck according to claim 7, characterized in that: The elastic sheets (24) disposed on adjacent piezoelectric sheets (211) are staggered angularly, and the projections of the elastic sheets (24) that abut against the two surfaces of the same piezoelectric sheet (211) are offset from each other.
9. A self-generating seat for a truck according to claim 8, characterized in that: The inner surface of the protective housing (22) is provided with a sliding groove (221), and the two ends of the protective housing (22) are provided with counterweights (25), which cooperate with the sliding groove (221) to slide.
10. A self-generating seat for a truck according to claim 9, characterized in that: The counterweight (25) abuts against the limiting ring (26) at the end face away from the piezoelectric piece (211). The limiting ring (26) has an annular recess in the middle. The annular recess cooperates with the end face of the protective shell (22) to realize the movable connection between the limiting ring (26) and the protective shell (22).