Long-term stable rotary action driven contact electrification energy harvesting device structure

Abstract

The application discloses a long-term stable rotary driving contact electrification energy collection device structure, and belongs to the technical field of new energy devices.The structure comprises a rotating shaft, a bearing, a driving torsional spring, a rotor part, a torsion part, a return torsional spring and a stator part.The rotor part is sleeved at the periphery of the bearing.The torsion part comprises a first blade base, a plurality of concave-convex structures and a plurality of first blades with equal included angles arranged in the first blade base.The surface of the first blade is provided with an electrode with a positive static layer.The stator part comprises a second blade base and a plurality of second blades with equal included angles arranged in the second blade base.The surface of the second blade is provided with an electrode with a negative static layer.The driving torsional spring is fixed at the periphery of the rotor part and is used for driving the convex part in the concave-convex structure.The return torsional spring is fixed on the rotating shaft between the torsion part and the stator part.The application drives the high-frequency contact separation of the positive and negative static layers through the rotary driving, does not need to consume the static layer, and has practicability and output stability.

Description

Technical Field

[0001] This invention belongs to the field of new energy device technology, specifically relating to a contact-based energy harvesting device structure driven by long-term stable rotation. Background Technology

[0002] Electrostatic harvesting devices, as a novel type of micro-energy harvesting device, can collect electrostatic energy from the environment to power the system, and have broad application prospects, especially in distributed Internet of Things (IoT) systems. Traditional electromagnetic generators, due to their relatively simple structure, are difficult to apply to miniaturized, flattened, multi-point distributed self-powered IoT systems. In contrast, electrostatic harvesting devices offer a variety of structural forms, allowing for customized design based on different application scenarios.

[0003] Electrostatic discharge (ESD) devices are mainly classified into four structural types: contact-based, contact-sliding, single-electrode, and floating-sliding. Contact-sliding ESD devices gradually wear down their electrostatic layer during operation, leading to a gradual decrease in output performance. Contact-based and floating-sliding ESD devices, however, operate on the principle of electrostatic induction, where positive and negative electrostatic layers generate induced charges through contact and separation, without relative sliding friction between the layers, often exhibiting better long-term stability. Floating-sliding ESD devices offer long-term stability but have lower output performance compared to contact-sliding devices; to enhance output performance, specific methods of charge replenishment are typically employed. Contact-based ESD devices offer long-term stability and require no charge replenishment, but their structure is relatively simple, with multi-layered integrated structures often consisting of simple vertical stacking. This means a high-frequency reciprocating action from the generator is required to achieve high output. Therefore, this structural simplicity significantly limits the application of contact-based ESD devices.

[0004] In daily life, rotational motion and low-frequency reciprocating motion are two common forms of motion. If a contact-electrostatic electrostatic acquisition device with a specific structure can be designed to transform rotational motion or low-frequency reciprocating motion into the repeated contact and separation of positive and negative electrostatic layers at high frequency, it can simultaneously ensure output performance and long-term stability of output performance, providing a feasible structure and solution for the application of contact-electrostatic electrostatic acquisition devices. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention provides a contact-based electrostatic harvesting device structure driven by a long-term stable rotational action. By driving the device through rotation, the rotational action is converted into a higher-frequency contact separation action. The higher-frequency contact separation significantly improves the continuous stability of the device's output power and output performance. The rotational driving method also enhances the practicality and usability of the contact-based electrostatic harvesting device.

[0006] A contact-electrified energy harvesting device structure driven by long-term stable rotation is characterized by comprising a rotating shaft, bearings, a torsion spring, a rotor section, a torsion section, a return torsion spring, and a stator section.

[0007] The rotating shaft passes sequentially through the bearing, rotor section, torsion section, return torsion spring and stator section;

[0008] The rotor portion is sleeved around the bearing, which is used for limiting the rotation of the rotor portion along a fixed plane perpendicular to the radial direction of the shaft under external forces.

[0009] The torsion section includes a first blade base facing the rotor section, a plurality of concave and convex structures disposed around the first blade base, and a plurality of first blades arranged at equal angles and embedded in the first blade base; the surface of the first blade is provided with an electrode with a positive electrostatic layer, and the electrodes of each first blade are connected in sequence.

[0010] The stator includes a second blade base and a plurality of second blades arranged at equal angles and embedded in the second blade base; the surface of the second blade is provided with an electrode with a negative electrostatic layer, and the electrodes of each second blade are connected in sequence; the number of second blades is the same as that of the first blades, and in the initial state the second blades are in contact with the corresponding first blades;

[0011] The actuating torsion spring is fixed to the periphery of the rotor part and is used to actuate the protrusions in the concave-convex structure, so that the torsion part is torsion along a plane perpendicular to the radial direction of the rotating shaft, at which time the second blade separates from the corresponding first blade.

[0012] The return torsion spring is fixed on the shaft between the torsion part and the stator part. The two ends of the return torsion spring are insulated and contact the second blade and the corresponding first blade, respectively. During the torsion process, the torsion part is resisted by the return torsion spring, so that the second blade and the corresponding first blade re-fit.

[0013] Furthermore, the rotor portion and the torsion portion only come into contact through the actuation of the torsion spring, and there is no mutual friction between them.

[0014] Furthermore, with the rotational speed of the rotor section fixed, the number of protrusions in the concave-convex structure is proportional to the frequency of contact separation between the positive and negative electrostatic layers.

[0015] Furthermore, the first blade base has a PCB (printed circuit board) on one side where the first blade is inserted, and the PCB has pads that correspond one-to-one with the first blade. The electrodes of the first blade are electrically connected to the corresponding pads. After all the pads are electrically connected, the electrodes of each first blade are connected in sequence.

[0016] Furthermore, the second blade base has a PCB on one side where the second blade is inserted, and the PCB has pads that correspond one-to-one with the second blade. The electrodes of the second blade are electrically connected to the corresponding pads. After all the pads are electrically connected, the electrodes of each second blade are connected in sequence.

[0017] Furthermore, there are multiple actuating torsion springs, all of which are fixed to the periphery of the rotor portion.

[0018] The working principle of the contact-electrified energy harvesting device structure driven by long-term stable rotation provided by this invention is as follows:

[0019] In the initial state, the second blade of the stator part is in contact with the corresponding first blade of the torsion part, so that the positive and negative electrostatic layers are in contact. Under the action of the external force, the rotor part rotates along a fixed plane perpendicular to the radial direction of the rotating shaft, which drives the pulsating torsion spring fixed on the periphery of the rotor part to move and contact the protrusion in the concave-convex structure, thereby causing the torsion part to twist, so that the second blade separates from the corresponding first blade. After the torsion part twists at a certain angle, the pulsating torsion spring slides away from the currently contacted protrusion. At this time, the torsion part rotates in the opposite direction under the resistance of the return torsion spring until it returns to the initial position, that is, the second blade and the corresponding first blade re-attach, thus completing one contact separation action of the positive and negative electrostatic layers.

[0020] When an external force applies a continuous rotational action to the structure of the contact-electrified energy harvesting device, the torsional part can continuously reciprocate at a high frequency. The positive and negative electrostatic layers of the contact-electrified energy harvesting device structure continuously contact and separate at this frequency, and the charge continuously transfers between the electrodes of the torsional part and the electrodes of the stator part. By connecting an energy storage element between the electrodes of the torsional part and the electrodes of the stator part, energy harvesting is achieved.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The contact-electrified energy harvesting device structure driven by long-term stable rotation proposed in this invention can drive the high-frequency contact separation of the positive and negative electrostatic layers solely through rotation. Since rotation is easier to implement in practice, it is more practical than the high-frequency reciprocating drive of traditional contact-electrified energy harvesting device structures.

[0023] 2. Compared with contact sliding electrostatic harvesting devices, this invention does not consume the electrostatic layer and has superior continuous stability of output performance. After 5 million taps, it still maintains 94% of the initial output. Attached Figure Description

[0024] Figure 1This is an exploded view of the structure of the contact-electrified energy harvesting device driven by long-term stable rotational action proposed in Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the torsion part, the return torsion spring, and the stator part after assembly in Embodiment 1 of the present invention;

[0026] Figure 3 This is a detailed structural diagram of the rotor portion in Embodiment 1 of the present invention;

[0027] Figure 4 This is a detailed structural diagram of the torsion portion in Embodiment 1 of the present invention;

[0028] Figure 5 This is a detailed exploded view of the stator, shaft, and return torsion spring in Embodiment 1 of the present invention;

[0029] Figure 6 This is a partial exploded view of the torsion portion in Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram showing the breakdown steps of a single contact separation cycle of the positive and negative electrostatic layers in Embodiment 1 of the present invention.

[0031] Figure 8 This is a graph showing the output voltage before and after 5 million electrostatic shocks when a 100MΩ load resistor is connected in Embodiment 1 of the present invention.

[0032] Explanation of markings in the attached diagram:

[0033] A1, Shaft; A2, Rotor section; A3, Torsion section; A4, Return torsion spring; A5, Stator section; A6, Bearing; A2-1, External connecting block; A2-2, Rotor body; A2-3, Actuating torsion spring; A3-1, First blade base; A3-2, Concave-convex structure; A3-3, First PCB; A3-4, First blade; A5-1, Second blade; A5-2, Negative electrostatic layer; A5-3, Second blade base; A5-4, Second PCB; A3-3-1, Solder pad. Detailed Implementation

[0034] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] This embodiment proposes a long-term stable contact-electrified energy harvesting device structure driven by rotation, as shown in the figure below. Figure 1 As shown, it includes a rotating shaft A1, a bearing A6, a torsion spring A2-3, a rotor part A2, a torsion part A3, a return torsion spring A4, and a stator part A5.

[0037] The rotating shaft A1 passes sequentially through the bearing A6, the rotor part A2, the torsion part A3, the return torsion spring A4, and the stator part A5.

[0038] like Figure 3 As shown, the rotor part A2 includes an external connecting block A2-1 located at the center and a rotor body A2-2; wherein, the rotor body A2-2 is disc-shaped and has multiple columnar beams around it for mounting multiple torsion springs A2-3; the rotor body A2-2 is sleeved around the bearing A6, which is used for limiting the position; the external connecting block A2-1 is connected to an external structure that provides rotational action, and the external structure drives the rotor part A2 to rotate along a fixed plane perpendicular to the radial direction of the rotating shaft through the external connecting block A2-1.

[0039] like Figure 4 As shown, the torsion portion A3 includes a first blade base A3-1 with an L-shaped groove facing the rotor portion A2, multiple concave and convex structures A3-2 disposed around the first blade base A3-1, and multiple first blades A3-4 arranged at equal angles and embedded in the L-shaped groove of the first blade base A3-1; wherein, the first blades A3-4 are made of 5052 aluminum alloy, which has a certain hardness and can serve as a positive electrostatic layer for electrodes and electrostatic collection devices; as Figure 6 As shown, the first blade base A3-1 has a first PCB A3-3 of the same size as the concave-convex structure on one side where the first blade A3-4 is inserted. The first PCB A3-3 has pads A3-3-1 corresponding to the first blade A3-4. The electrodes of the first blade A3-4 are electrically connected to the corresponding pads A3-3-1. After all the pads A3-3-1 are electrically connected through printed copper lines, the electrodes of each first blade A3-4 are connected in sequence.

[0040] like Figure 5 As shown, the stator portion A5 includes a second blade base A5-3 with an L-shaped groove and multiple second blades A5-1 arranged at equal angles and embedded in the L-shaped groove of the second blade base A5-3; wherein, the shape and number of the second blades A5-1 are the same as those of the first blades A3-4, and all are made of 5052 aluminum alloy, totaling 16, with a certain hardness, and can be used as electrodes, and a negative electrostatic layer A5-2 is attached to the surface of the second blades A5-1; a second PCB A5-4 is provided on the side of the second blade base A5-3 where the second blades A5-1 are embedded, and the second PCB A5-4 is provided with pads corresponding to the second blades A5-1, the electrodes of the second blades A5-1 are electrically connected to the corresponding pads, and after all the pads are electrically connected through printed copper lines, the electrodes of each second blade A5-1 are sequentially connected; in the initial state, the second blades A5-1 are attached to the corresponding first blades A3-4.

[0041] One end of the actuating torsion spring A2-3 is fixed to the rotor body A2-2, and the other end is used to actuate the protrusion in the concave-convex structure A3-2 during rotation, so that the torsion part A3 twists along a plane perpendicular to the radial direction of the rotating shaft. At this time, the second blade A5-1 separates from the corresponding first blade A3-4. At this time, the rotor part A2 and the torsion part A3 only contact each other through the actuating torsion spring A2-3, and no mutual friction occurs between them.

[0042] like Figure 2 As shown, the return torsion spring A4 is fixed on the rotating shaft A1 between the torsion part A3 and the stator part A5. The two ends of the return torsion spring A4 are insulated and respectively contact the second blade A5-1 and the corresponding first blade A3-4. During the torsion process, the torsion part A3 is resisted by the return torsion spring A4, so that the second blade A5-1 and the corresponding first blade A3-4 re-fit.

[0043] The working principle of the contact-electrified energy harvesting device structure driven by long-term stable rotation provided in this embodiment is as follows:

[0044] like Figure 7 As shown, in the initial state, the second blade A5-1 of the stator part A5 is in contact with the corresponding first blade A3-4 of the torsion part A3, making the positive and negative electrostatic layers in contact; the external structure such as the water turbine or fan blade drives the rotor part A2 to rotate counterclockwise along a fixed plane perpendicular to the radial direction of the rotating shaft through the external connecting block A2-1, which drives the paving torsion spring A2-3 fixed on the periphery of the rotor part A2 to move and contact the protrusion in the concave-convex structure A3-2, thereby causing the torsion part A3 to twist counterclockwise, causing the second blade A5-1 to separate from the corresponding first blade A3-4; in the torsion part A3 After being twisted at a certain angle, the return torsion spring A4 hinders the rotation of the twisted part A3. The greater the angle of the twist of the twisted part A3, the greater the deformation of the return torsion spring A4, and the greater the resistance applied to the twisted part A3. Therefore, the twisted part A3 is difficult to continue to twist after being twisted at a certain angle. At this time, the torsion spring A2-3 is moved away from the currently contacted protrusion. The twisted part A3 rotates clockwise under the resistance of the return torsion spring A4 until it returns to the initial position, that is, the second blade A5-1 and the corresponding first blade A3-4 re-attach, thereby completing one contact separation action of the positive and negative electrostatic layers.

[0045] When an external force applies a continuous rotational action to the contact-electrified energy harvesting device structure, the torsion part A3 can continuously reciprocate at a high frequency. The positive and negative electrostatic layers of the contact-electrified energy harvesting device structure continuously contact and separate at this frequency, and the charge continuously transfers between the electrodes of the torsion part A3 and the electrodes of the stator part A5. By connecting an energy storage element between the electrodes of the torsion part A3 and the electrodes of the stator part A5, energy harvesting is achieved.

[0046] As can be seen from the above working process, this embodiment can convert the rotation action into a higher frequency contact separation action, which improves the output performance and continuous stability of the electrostatic harvesting device. The rotation driving method improves the practicality of the contact-based electrostatic harvesting device.

[0047] In this embodiment, the torsion portion A3 has a total of 16 protrusions, indicating that the torsion portion A3 will torsion repeatedly 16 times for every revolution of the rotor portion A2. In other words, when the external structure such as the fan blades and water wheel provides a rotational speed of 1 r / s to the rotor portion of the electrostatic harvesting device, the contact separation frequency of the positive and negative electrostatic layers is 16 Hz. This shows that when the rotational speed of the rotor portion A2 is fixed, the number of protrusions in the concave-convex structure is proportional to the contact separation frequency of the positive and negative electrostatic layers.

[0048] Figure 7 To illustrate the output voltage variation of the actual device being tested, an electrostatic harvesting device was fabricated based on the structure described in this embodiment. The dimensions of this electrostatic harvesting device are as follows: the length of the electrostatic layer of a single second blade A5-1 and the first blade A3-4 is 27 mm, the width is 18 mm, the number of positive and negative electrostatic layers is 16, and the number of protrusions in the concave-convex structure is 16. A 100 MΩ resistor is connected between the two electrodes. Figure 7 It can be seen that after 5 million taps (about 69 hours), the peak output voltage of the device will drop from 384V to 360V, but it can still maintain about 94% of the initial output. This shows that the contact-charged electrostatic harvesting device in this embodiment does have the characteristic of long-term stable output performance.

[0049] Although the illustrative specific embodiments of the present invention have been described above to enable those skilled in the art to understand the invention, it should be understood that the invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of the present invention are protected.

Claims

1. A contact-based energy harvesting device structure driven by long-term stable rotation, characterized in that, Includes shaft, bearing, actuating torsion spring, rotor section, torsion section, return torsion spring and stator section; The rotating shaft passes sequentially through the bearing, rotor section, torsion section, return torsion spring and stator section; The rotor portion is sleeved around the bearing, which is used for limiting the rotation of the rotor portion along a fixed plane perpendicular to the radial direction of the shaft under external forces. The torsion section includes a first blade base facing the rotor section, a plurality of concave and convex structures disposed around the first blade base, and a plurality of first blades arranged at equal angles and embedded in the first blade base; the surface of the first blade is provided with an electrode with a positive electrostatic layer, and the electrodes of each first blade are connected in sequence. The stator includes a second blade base and a plurality of second blades arranged at equal angles and embedded in the second blade base; the surface of the second blade is provided with an electrode with a negative electrostatic layer, and the electrodes of each second blade are connected in sequence; the number of second blades is the same as that of the first blades, and in the initial state the second blades are in contact with the corresponding first blades; The actuating torsion spring is fixed to the periphery of the rotor part and is used to actuate the protrusions in the concave-convex structure, so that the torsion part is torsion along a plane perpendicular to the radial direction of the rotating shaft, at which time the second blade separates from the corresponding first blade. The return torsion spring is fixed on the shaft between the torsion part and the stator part. The two ends of the return torsion spring are insulated and contact the second blade and the corresponding first blade, respectively. During the torsion process, the torsion part is resisted by the return torsion spring, so that the second blade and the corresponding first blade re-fit.

2. The contact-electrified energy harvesting device structure driven by long-term stable rotational action according to claim 1, characterized in that, With a fixed rotational speed of the rotor, the number of protrusions in the concave-convex structure is proportional to the frequency of contact and separation of the positive and negative electrostatic layers.

3. The contact-electrified energy harvesting device structure driven by long-term stable rotational action according to claim 1, characterized in that, The first blade base has a PCB on one side where the first blade is inserted, and the PCB has pads that correspond one-to-one with the first blade. The electrodes of the first blade are electrically connected to the corresponding pads. After all the pads are electrically connected, the electrodes of each first blade are connected in sequence.

4. The contact-electrified energy harvesting device structure driven by long-term stable rotational action according to claim 1, characterized in that, The second blade base has a PCB on one side where the second blade is inserted, and the PCB has pads that correspond one-to-one with the second blade. The electrodes of the second blade are electrically connected to the corresponding pads. After all the pads are electrically connected, the electrodes of each second blade are connected in sequence.

5. The contact-electrified energy harvesting device structure driven by long-term stable rotational action according to claim 1, characterized in that, The actuating torsion springs are multiple in number and are all fixed on the periphery of the rotor section.

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