Power generation device with improved efficiency using resonance

Abstract

To provide a power generation device that improves efficiency by using the vibration generated by resonance to generate electricity.SOLUTION: The power generation device with improved efficiency using resonance includes a piezoelectric unit 20 that includes a cylindrical base unit 10 and at least one piezoelectric element that is arranged on the outer surface of the base unit and generates electricity from the vibrations generated by the base unit. The base unit is open on one side and closed on the other side by a cover unit 110.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a power generation device that improves efficiency by utilizing resonance.

Background Art

[0002] Recently, there has been an increasing interest in renewable energy technologies that are environmentally friendly.

[0003] Among renewable energy technologies, power generation technologies that utilize vibration have recently been the subject of active research and development.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a power generation device that generates electricity by utilizing vibration generated by resonance.

Means for Solving the Problems

[0005] A power generation device that improves efficiency by utilizing resonance according to the present invention to achieve the above object includes a cylindrical base part and a piezoelectric part disposed on an outer surface of the base part and including at least one piezoelectric element that generates electricity by vibration generated by the base part.

[0006] The base part can include a metal material. One side of the base part is open and the other side is closed. The power generation device further includes a cover part that closes the other side of the base part, and the cover part can include a convexly protruding portion.

[0007] The cover part can include the same material as that of the base part. The cover part can be connected to the other side of the base part by a method such as welding. The cover part and the base part can be integrally formed to form a single body. The cover part can have a hemispherical shape.

[0008] The power generation device further includes a pillar part connected to the central part of the cover part, and the pillar part may be connected to the support base. A first hole is formed in the central part of the cover part, and the pillar part may include a portion that supports the cover part and is inserted into the first hole. The cover part may further include a buffer part including a portion located on the side wall of the first hole.

[0009] The buffer part may include a material softer than the cover part.

[0010] The base part has at least one flat surface on the outer surface, and the piezoelectric part may be disposed on the flat surface. A bending surface may be disposed between the flat surface and one side of the base part in the longitudinal direction of the base part.

[0011] The power generation device may further include vibration generating means for generating vibration of the base part by applying at least one of friction or impact to the bending surface. A portion of the vibration generating means that contacts the bending surface may include a material softer than the base part.

[0012] A portion of the vibration generating means that contacts the bending surface may include a leather material, a urethane material, a rubber material, a PC (Poly Carbonate) material, and / or a synthetic resin material.

[0013] The base part may have a constant wall thickness in a region corresponding to the bending surface.

[0014] The wall thickness of the region of the base part corresponding to the bending surface may be thicker than the maximum wall thickness of the region of the base part corresponding to the flat surface. The average wall thickness of the base part in the region corresponding to the flat surface may be thinner than the wall thickness of the base part in the region corresponding to the region between the two flat surfaces.

[0015] In the region corresponding to the flat surface, the base portion can have a variable wall thickness. The base portion can have a minimum wall thickness at a portion corresponding to the center of the flat surface in the circumferential direction.

[0016] A plurality of protruding portions having a convex shape can be arranged on the curved surface. The curved surface can have a smooth surface.

[0017] The length of the flat surface in the longitudinal direction of the base portion may be greater than the width of the base portion in the circumferential direction (Circumterential Direction). The piezoelectric portion may have a length in the longitudinal direction greater than the width in the circumferential direction. An adhesive layer for attaching the piezoelectric portion to the base portion may be disposed between the flat surface and the piezoelectric portion. The adhesive layer can include an epoxy material.

[0018] A recessed portion having a concave shape is formed on the flat surface. The recessed portion includes a portion extending in the longitudinal direction of the base portion, and the piezoelectric portion is disposed within the recessed portion. The minimum thickness of the base portion may be smaller than the average depth of the recessed portion. The length of the recessed portion in the longitudinal direction of the base portion may be shorter than the length of the flat surface.

[0019] The ratio of the inner diameter of the base portion to the length of the base portion is 1:0.5 to 1:2, and the ratio of the inner diameter of the base portion to the average wall thickness of the base portion can be 200:1 to 5:1. The power generation device can further include a protective layer that covers the piezoelectric portion disposed within the recessed portion.

[0020] Another power generation device that improves efficiency by utilizing resonance according to the present invention includes a cylindrical first base part, a cylindrical second base part, and a piezoelectric portion. The piezoelectric portion is disposed on the outer surfaces of the first base portion and the second base portion, respectively, and includes at least one piezoelectric element that generates electricity by vibrations generated by the first base portion or the second base portion.

[0021] The first base part and the second base part are open on one side and closed on the other side, and further include a first cover part (First Cover Part) that closes the other side of the first base part and a second cover part (Second Cover Part) that closes the other side of the second base part. One side of the first base part and one side of the second base part can face each other.

[0022] The power generation device further includes a first pillar part (First Pillar Part) whose one end is connected to the central part of the first cover part, a first supporting part (First Supporting Part) to which the other end of the first pillar part is connected, a second pillar part (Second Pillar Part) whose one end is connected to the central part of the second cover part, and a second supporting part (Second Supporting Part) to which the other end of the second pillar part is connected. The first supporting part is located on the ground, and the second supporting part can be arranged above the first supporting part.

Advantages of the Invention

[0023] The power generation device according to the present invention can achieve high power generation efficiency by applying the principle of resonance even when using a piezoelectric element as an element for generating electricity.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Best Mode for Carrying Out the Invention

[0025] To explain the present disclosure, the operational advantages thereof, and the objectives achieved by the embodiments of the present disclosure, the preferred embodiments of the present disclosure will be described below and the present disclosure will be considered with reference to the preferred embodiments.

[0026] In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and are not to be construed as precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0027] In the description of the present disclosure, when it is determined that a specific description of known functions or configurations related to the present disclosure may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. Hereinafter, embodiments of the power generation device according to the present invention will be described in detail with reference to the accompanying drawings.

[0028] FIG. 1 is a diagram for explaining the configuration of a power generation device that improves efficiency by utilizing resonance according to the present invention.

[0029] Referring to FIG. 1, a power generation device (10S, hereinafter referred to as the "power generation device") that improves efficiency by utilizing resonance according to the present invention can include a base part (10) and a piezoelectric part (20). Further, the power generation device 10S can further include at least one of a vibration generating means (30), a driver (40), or an arm part (50).

[0030] The base portion 10 can have a cylindrical shape. The base portion 10 can include any material as long as it can generate vibrations. Preferably, the base portion 10 can include a metal material such as aluminum or copper.

[0031] The piezoelectric portion 20 may be disposed on the outer surface of the base portion 10. The piezoelectric portion 20 can include at least one piezoelectric element that generates electricity with the vibration generated by the base portion 10. The vibration generating means 30 can generate the vibration of the base portion 10 by applying at least one of friction or impact.

[0032] The arm portion 50 can drive the vibration generating means 30 in response to the control of the drive portion 40. The drive portion 40 can control the arm portion 50 so as to apply friction and / or impact to the base portion 10. The drive portion 40 can store or supply to the system the electricity generated by the piezoelectric portion 20 by utilizing the vibration of the base portion 10. For this purpose, the drive portion 40 can be transmitted with electricity from the piezoelectric portion 20 via the power line PL, or can be supplied with power from another power supply source.

[0033] The identification code IS not shown in FIG. 1 can represent the inner side surface corresponding to the outer side surface (OS) of the base portion 10.

[0034] When the vibration generating means 30 applies impact and / or friction to the base portion 10, the base portion 10 may vibrate. Here, the base portion 10 can resonate corresponding to the vibration frequency. Thereby, the vibration of the base portion 10 can be gradually weakened without disappearing in a short time and can be maintained for a sufficiently long time.

[0035] Thereby, the amount of electricity produced by the piezoelectric portion 20 using the vibration of the base portion 10 can be increased. Thereafter, the drive portion 40 can be supplied with the electricity generated by the piezoelectric portion 20 and store it or supply it to another system.

[0036] Hereinafter, each part of the power generation device 10S according to the present invention will be described in more detail.

[0037] FIGS. 2 to 12 are diagrams for explaining the base part and the piezoelectric part in detail. Hereinafter, the description of the parts described in detail above can be omitted.

[0038] Referring to FIG. 2, the base part 10 can have a cylindrical shape with one side E1 open and the other side E2 closed. For this purpose, the power generation device 10S according to the present invention can further include a cover part (Cover Part, 10) that closes the other side E2 of the base part 10.

[0039] The cover part 110 can include a part that protrudes convexly in the longitudinal direction (Longitudinal Direction, DR1) of the base part 10. The cover part 110 can include the same material as the base part 10. The cover part 110 may be connected to the other side E2 of the base part 10. Alternatively, the cover part 110 and the base part 10 may be integrally formed to form a single body. The cover part 110 can have a hemispherical shape.

[0040] The power generation device 10S according to the present invention can further include a pillar part (Pillar Part, 120). One side of the pillar part 120 may be connected to the central part of the cover part 110. The other side of the pillar part 120 can be connected to a support base (not shown).

[0041] In order to make the base part 10 resonate sufficiently effectively corresponding to the vibration frequency, the inner diameter R1 of the base part 10, the length D3 of the base part 10, and the average wall thickness (D2) of the base part 10 can be appropriately adjusted.

[0042] Preferably, the ratio of the inner diameter R1 of the base part 10 to the length D3 of the base part 10 in the longitudinal direction DR1 can be 1:0.5 to 1:2. More preferably, the ratio of the inner diameter R1 of the base part 10 to the length D3 of the base part 10 in the longitudinal direction DR1 can be 1:0.8 to 1:3.

[0043] Preferably, the ratio of the inner diameter R1 of the base portion 10 to the average wall thickness D2 of the base portion 10 can be from 200:1 to 5:1. More preferably, the ratio of the inner diameter R1 of the base portion 10 to the average wall thickness D2 of the base portion 10 can be from 100:1 to 20:1.

[0044] On the outer surface of the base portion 10, a plurality of piezoelectric portions 20 may be arranged in the circumferential direction (Circumferential Direction, R2) of the base portion 10. In the longitudinal direction DR1 of the base portion 10, the piezoelectric portion 20 and one side E1 of the base portion 10 may be separated by a predetermined distance D1.

[0045] In the longitudinal direction DR1 of the base portion 10, a bending surface CS can be located between the piezoelectric portion 20 and one side E1 of the base portion 10. Also, in the longitudinal direction DR1 of the base portion 10, the piezoelectric portion 20 and the other side E2 of the base portion 10 may be separated by a predetermined distance D1a.

[0046] In the longitudinal direction DR1 of the base portion 10, another bending surface CS1 may be located between the piezoelectric portion 20 and the other side E2 of the base portion 10. In the longitudinal direction DR1 of the base portion 10, the interval D1 between the piezoelectric portion 20 and one side E1 of the base portion 10 may be larger than the interval D1a between the piezoelectric portion 20 and the other side (E2) of the base portion 10.

[0047] Referring to FIG. 3, the base portion 10 can have at least one flat surface on the outer surface OS. On the outer surface of the base portion 10, a plurality of flat surfaces FS may be arranged in the circumferential direction DR2 of the base portion 10. The piezoelectric portion 20 can be arranged on the flat surface FS.

[0048] In this case, the bending surface CS can be located between the flat surface FS and one side E1 of the base portion 10 in the longitudinal direction DR1 of the base portion 10. The bending surface CS can have a smooth surface.

[0049] The flat surface FS may have a length D4 in the longitudinal direction DR1 of the base 10 that is greater than the width D5 in the circumferential direction DR2 of the base portion 10. The piezoelectric portion 20 may have a length D6 in the longitudinal direction DR1 that is greater than the width D7 in the circumferential direction DR2.

[0050] An adhesive layer 20 for attaching the piezoelectric portion 20 to the base portion 10 may be disposed between the flat surface FS and the piezoelectric portion 20. The adhesive layer 200 can include an epoxy material. The piezoelectric portion 20 can be fixed to the flat surface FS by the adhesive layer 200.

[0051] A view of the base portion 10 cut along the line A1 - A2 corresponding to the curved surface CS is shown in FIG. 4(A). Looking at FIG. 4(A), in the region corresponding to the curved surface CS, the base 10 can have a constant wall thickness D8.

[0052] Also, a view of the base portion 10 cut along the line A3 - A4 corresponding to the flat surface FS is shown in FIG. 4(B). Looking at FIG. 4(B), in the region corresponding to the flat surface FS, the base 10 can have a variable wall thickness.

[0053] In the region corresponding to the flat surface FS, the base portion 10 can have a minimum wall thickness D9 at a portion corresponding to the center of the flat surface FS in the circumferential direction DR2. Also, in the region corresponding to the flat surface FS, the average wall thickness of the base portion 10 may be even thinner than the wall thickness D10 of the base portion 10 in the region corresponding to between the two flat surfaces FS.

[0054] Looking at FIG. 5(A), the wall thickness D10 of the base portion 10 in the region corresponding to between the two flat surfaces FS is the same as the wall thickness (D8) of the base portion 10 in the region corresponding to the curved surface CS. Looking at FIG. 5(B), the wall thickness D8 in the region of the base portion 10 corresponding to the curved surface CS is the thickest among the wall thicknesses (D10) in the region of the base portion 10 corresponding to the flat surface FS.

[0055] Referring to FIG. 6, another bending surface CS2 can be located between two piezoelectric parts 20 adjacent to each other in the circumferential direction DR2 of the base part 10. The base part 10 can have a constant wall thickness D11 in the region corresponding to the other bending surface CS2.

[0056] The width D12 of the other bending surface CS2 in the circumferential direction DR2 of the base part 10 may be smaller than the width D13 of the flat surface FS. From another perspective, the angle θ2 corresponding to the other bending surface CS2 with reference to the center of the base part 10 may be smaller than the angle θ1 corresponding to the flat surface FS.

[0057] Referring to FIG. 7(A), the wall thickness D11 of the base part 10 corresponding to the other bending surface CS2 may be smaller than the wall thickness (D8) of the base part 10 in the region corresponding to the bending surface CS. Referring to FIG. 7(B), different from the case of FIG. 6(A) above, the width D15 of still another bending surface CS2 in the circumferential direction DR2 of the base part 10 may be larger than the width D14 of the flat surface FS.

[0058] From another perspective, the angle θ4 corresponding to the other bending surface CS2 with reference to the center of the base part 10 may be larger than the angle θ3 corresponding to the flat surface FS. In this case, the adhesive layer 200 corresponds to the flat surface FS in the first region AR1, and can correspond to the other bending surface CS2 in the second regions AR2 located on both sides of the first region AR1. Also, the piezoelectric part 20 can correspond to the flat surface FS in the first region AR1 and can correspond to the other bending surface CS2 in the second region AR2.

[0059] Referring to FIG. 8, another bending surface CS1 can be omitted between the flat surface FS, the longitudinal direction DR1, and the other side E2 of the base part 10. In this case, the flat surface FS may be adjacent to the cover part 110.

[0060] Referring to FIG. 9, a plurality of convex protrusions 130 can be arranged on the bending surface CS of the base part 10. In this case, the area of the contact surface of the base part 10 with respect to the vibration generating means 30 can be increased.

[0061] Referring to FIG. 10, the bending surface CS of the base portion 10 can include a plurality of grooves Groove, 140 that extend in the longitudinal direction DR1 and are recessed to a predetermined depth. A peak 141 extending in the longitudinal direction DR1 may be disposed between two adjacent grooves 140. The diameter of the base portion 10 in the region corresponding to the groove 140 may be smaller than the diameter of the base portion 10 in the region corresponding to the peak 141.

[0062] Referring to FIG. 11, a recessed portion 150 having a concave shape can be formed on the flat surface FS of the base portion 10. The recessed portion 150 can include a portion that extends in the longitudinal direction DR1 of the base portion 10.

[0063] Another flat surface FS1 may be formed within the recessed portion 150. The piezoelectric portion 20 may be disposed on the other flat surface FS1 within the recessed portion 150. The length D16 of the recessed portion 150 in the longitudinal direction DR1 of the base portion 10 may be smaller than the length D4 of the flat surface FS.

[0064] The width D17 of the recessed portion 150 in the circumferential direction DR2 of the base portion 10 may be smaller than the width D5 of the flat surface FS. The piezoelectric portion 20 can correspond to the portion having the minimum wall thickness D9 of the base portion 10. In this case, the base portion 10 can be resonated more easily.

[0065] Referring to FIG. 12(A), the width D17 of the recessed portion 150 in the circumferential direction DR2 of the base portion 10 may be larger than the interval D18 between two adjacent recessed portions 150. The minimum thickness D9 of the base portion 10 may be smaller than the average depth D19 of the recessed portion 150.

[0066] Referring to FIG. 12(B), the power generation device 10S according to the present invention can further include a protective layer (Protective Layer, 210) that covers the piezoelectric portion 20 disposed within the recessed portion 150.

[0067] Figs. 13 to 14 are diagrams for explaining in detail the vibration generating means of the power generation device according to the present invention and related parts. In the following, the description of the parts described in detail above can be omitted.

[0068] Referring to Fig. 13, the vibration generating means 30 can generate vibration of the base portion 10 by applying at least one of friction or impact to the bending surface CS of the base portion 10. For example, the vibration generating means 30 can rotate or reciprocate along the bending surface CS in a state of being in contact with the bending surface CS of the base portion 10.

[0069] For more effective vibration generation, the portion 300 in contact with the bending surface CS of the vibration generating means 30 can include a material softer than the base portion 10. The portion 300 in contact with the bending surface CS of the vibration generating means 30 can include a leather material, a urethane material, a rubber material, a PC (Poly Carbonate) material, and / or a synthetic resin material.

[0070] A plurality of vibration generating means 30 can be applied to one base portion 10. For example, as shown in Fig. 14, a first sub-vibration generating means 30S1 and a second sub-vibration generating means 30S2 can be applied corresponding to one base portion 10. The arm portion 500 can include a first sub-arm portion 50S1, a second sub-arm portion 50S2, and a rotating portion 500.

[0071] One end of the first sub-arm portion 50S1 is connected to the first sub-vibration generating means 30S1, and one end of the second sub-arm portion 50S2 is connected to the second sub-vibration generating means 30S2. The other ends of the first sub-arm portion 50S1 and the second sub-arm portion 50S2 may be connected to the rotating portion 500. The base portion 10 may be disposed between the first sub-arm portion 50S1 and the second sub-arm portion 50S2.

[0072] The rotating means 500 can rotate in a state where the first sub-arm portion 50S1 and the second sub-arm portion 50S2 are each in contact with the bending surface CS of the base portion 10. In this case, the base portion 10 can generate vibration by the first sub-arm portion 50S1 and the second sub-arm portion 50S2.

[0073] FIGS. 15 to 16 are diagrams for explaining in detail the cover portion, pillar portion, and related parts of the power generation device according to the present invention. In the following, the description of the parts described in detail above can be omitted.

[0074] Referring to FIG. 15(A), the other side of the pillar portion 120 can be connected to the support base 60. Referring to FIG. 15(B), a first hole (First Hole, H1) can be formed in the central portion of the cover portion 110. The pillar portion 120 can include a portion that supports the cover portion 110 and is inserted into the first hole H1.

[0075] Referring to FIG. 16, the power generation device 10S according to the present invention can further include a buffer portion 111 including a portion located on the side wall of the first hole H1. The buffer portion 111 can include a material softer than the cover portion 110. For example, the buffer portion 111 can include a rubber material, a synthetic resin material, and / or a plastic material.

[0076] Thread lines may be formed on the surface of the buffer portion 111. The pillar portion 120 can include a pillar body portion 121, a first portion 122 on which thread lines are formed, and a nut portion 123 fastened to the first portion 122.

[0077] The first portion 122 of the pillar portion 120 can be inserted into the first hole H1 while engaging with the thread lines of the buffer portion 111. In this case, the base portion 10 can be vibrated more effectively.

[0078] FIGS. 17 to 19 are diagrams for explaining still other configurations of the power generation device that improves efficiency by utilizing resonance according to the present invention. In the following, the description of the parts described in detail above can be omitted.

[0079] Referring to FIG. 17, another power generation device 10S1 according to the present invention can include a first base part (10A), a second base part (10B), a piezoelectric part 20, a first cover part (110A), and a second cover part (110B).

[0080] The first base part 10A and the second base part 10B can each have a cylindrical shape. The piezoelectric part 20 can be disposed on the outer surfaces of the first base part 10A and the second base part 10B respectively, and can include at least one piezoelectric element that generates electricity by the vibration generated by the first base part 10A or the second base part 10B.

[0081] One side E1 of the first base part 10A and the second base part 10B is open, and the other side E2 is closed. The first cover part 110A can close the other side E2 of the first base part 10A, and the second cover part 110B can close the other side E2 of the second base part 10B. Here, one side E1 of the first base part 10A and one side E1 of the second base part 10B can face each other.

[0082] Another power generation device 10S1 according to the present invention can further include a first pillar part (120A), a first supporting part (60A), a second pillar part (120B), and a second supporting part (60B).

[0083] One end of the first pillar part 120A may be connected to the central portion of the first cover part 110A. The other end of the first pillar part 120A may be connected to the first supporting part 60A. One end of the second pillar part 120B may be connected to the central portion of the second cover part 110B. The other end of the second pillar part 120B is connected to the second supporting part 60B.

[0084] Here, the first support base 60A may be located on the ground, and the second support base 60B may be located above the first support base 60A. Corresponding to the first base portion 10A, the first-1 sub-vibration generating means 30AS1 and the second-1 sub-vibration generating means 30AS2 can be applied.

[0085] Corresponding to the second base portion 10B, the first-2 sub-vibration generating means 30BS1 and the second-2 sub-vibration generating means 30BS2 can be applied. In this case, the vibration generated in the first base portion 10A can be transmitted to the second base portion 10B to amplify the vibration of the second base portion 10B.

[0086] Also, the vibration generated in the second base portion 10B can be transmitted to the first base portion 10A to amplify the vibration of the first base portion 10A. The distance D20 between the first base portion 10A and the second base portion 10B may be shorter than the lengths D1A and D1B of the bending surfaces CS in the longitudinal direction DR1 of the first base portion 10A and the second base portion 10B.

[0087] Referring to FIG. 18, the first-1 sub-vibration generating means 30AS1 can perform a reciprocating motion in contact with the bending surface CS of the first base portion 10A in the third region AR3. The second-1 sub-vibration generating means 30AS2 can perform a reciprocating motion in contact with the bending surface CS of the first base portion 10A in the fourth region AR4.

[0088] In this way, the first-1 sub-vibration generating means 30AS1 and the second-1 sub-vibration generating means 30AS2 can generate vibration by applying friction to the bending surface CS of the first base portion 10A.

[0089] The first-2 sub-vibration generating means 30BS1 can perform a reciprocating motion in contact with the bending surface CS of the second base portion 10B in the fifth region AR5. The second-2 sub-vibration generating means 30BS2 can perform a reciprocating motion in contact with the bending surface CS of the second base portion 10B in the sixth region AR6.

[0090] In this way, the first-second sub-vibration generating means 30BS1 and the second-second sub-vibration generating means 30BS2 can generate vibrations by applying friction to the bending surface CS of the second base portion 10B.

[0091] Referring to FIG. 19, the first-first sub-vibration generating means 30AS1 and the second-first sub-vibration generating means 30AS2 may be incorporated in the first common vibration generating means 30CS1.

[0092] The first common vibration generating means 30CS1 generates vibrations by applying friction to the bending surface CS in the third region AR3 of the first base portion 10A and the fifth region AR5 of the second base portion 10B.

[0093] The first-second sub-vibration generating means 30BS1 and the second-second sub-vibration generating means 30BS2 may be incorporated in the second common vibration generating means 30CS2. The second common vibration generating means 30CS2 can generate vibrations by applying friction to the bending surface CS in the fourth region AR4 of the first base portion 10A and the sixth region AR6 of the second base portion 10B.

[0094] As described above, the present invention has been described in detail using desirable embodiments. However, the scope of the present invention is not limited to specific embodiments and should be interpreted by the appended claims. Also, those skilled in the art should understand that many modifications and variations can be made without departing from the scope of the present invention.

Explanation of Reference Numerals

[0095] 10S: Power generation device 10: Base portion 20: Piezoelectric portion 30: Vibration generating means 40: Driving portion 50: Whip trigger

Claims

1. A piezoelectric unit including a cylindrical base portion and at least one piezoelectric element disposed on an outer surface of the base portion for generating electricity by vibrations generated by the base portion, wherein the base portion has one side open and the other side closed, has at least one flat surface on the outer surface, and the piezoelectric unit is disposed on the flat surface, a curved surface is located between the flat surface and one side of the base portion in the longitudinal direction of the base portion, and further includes vibration generating means for applying at least one of friction or impact to the curved surface to generate vibrations of the base portion, and is a power generation device that improves efficiency by utilizing resonance.

2. further including a cover portion closing the other side of the base portion and a column portion connected to a central portion of the cover portion, wherein the cover portion protrudes convexly from the base portion, and the column portion is connected to a support base, and is the power generation device that improves efficiency by utilizing resonance according to Claim 1.

3. The wall thickness in a region corresponding to the curved surface of the base portion is thicker than the maximum wall thickness in a region corresponding to the flat surface of the base portion, and is the power generation device that improves efficiency by utilizing resonance according to Claim 1.

Images