JP2019115197A - Vibration power generator - Google Patents

Abstract

To provide a vibration power generator capable of efficiently transmitting vibration energy to a weight while suppressing a decrease in processability.SOLUTION: The vibration power generator includes: a frame 2 to which a vibration is input; a weight 5 elastically supported by the frame 2; a first tension coil spring 6 and a second tension coil spring 7 connected to the frame 2 and elastically supporting the weight 5 from mutually opposite directions; and a power generation unit that generates an induced electromotive force by the weight 5 vibrating with respect to the frame 2. Vickers hardness of the frame 2 is 700 or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration power generation apparatus that generates an induced electromotive force using vibration.

  Patent Document 1 describes a vibration power generation apparatus configured to generate an induced electromotive force using vibration. The vibration power generating apparatus has a structure in which the weight vibrates with respect to the frame by connecting the frame (case) and the weight via a coil spring set.

JP, 2016-025762, A

  By the way, vibrators, such as equipment and bridges, generate environmental vibrations of a predetermined frequency. It is preferable to miniaturize the vibration power generation device that generates electric power by environmental vibration generated from such a vibration body in consideration of the degree of freedom of attachment. However, when the vibration power generation apparatus is miniaturized, the volume and mass of the weight are also reduced, so that the vibration of the weight is suppressed due to the influence of the magnetic field generated from the coil at the time of power generation. . For this reason, in order to obtain a high output in a miniaturized vibration power generation apparatus, it is considered effective to construct the frame with a material that is difficult to damp the vibration and efficiently transmit the vibration energy to the weight . However, many of the materials which are difficult to damp the vibration have a problem that the processability is poor because they are too hard. As a material which is hard to damp vibration, single crystal silicon etc. are mentioned, for example.

  Therefore, one aspect of the present invention is to provide a vibration power generation device capable of efficiently transmitting vibration energy to a weight while suppressing a decrease in processability.

  A vibration transmission device according to one aspect of the present invention includes a frame to which vibration is input, a weight elastically supported by the frame, and a first tension coil spring connected to the frame and elastically supporting the weight from opposite directions. And a second tension coil spring, and a power generation unit that generates an induced electromotive force by vibrating a weight relative to the frame, and the Vickers hardness of the frame is 700 or less.

  In this vibration power generation apparatus, since the Vickers hardness of the frame is 700 or less, even if the frame is hardened so that the vibration energy can be efficiently transmitted to the weight, the deterioration of the processability of the frame is suppressed. be able to.

  The frame has a vibration input surface to which vibration is input, a first connection portion to which a first tension coil spring is connected, and a second connection portion to which a second tension coil spring is connected. The surface and the first connection portion and the second connection portion may be connected by a material having a Young's modulus of 40 GPa or more. In this vibration power generating apparatus, in the frame, the vibration input surface and the first connection portion and the second connection portion are connected by a material having a Young's modulus of 40 GPa or more, so the vibration input from the vibration input surface is the first Attenuation can be suppressed before being transmitted to the connection part and the second connection part. Thus, vibrational energy can be efficiently transmitted to the weight.

  A first connection member for connecting the first tension coil spring to the frame at the first connection portion; and a second connection member for connecting the second tension coil spring to the frame at the second connection portion; The connection member may be formed of a material having a Young's modulus of 40 GPa or more. In this vibration power generator, the first connection member and the second connection member are formed of a material having a Young's modulus of 40 GPa or more, so that the vibration is attenuated at the connection position between the frame and the first tension coil spring and the second tension coil spring. Can be suppressed.

  You may further provide the cover part which covers a part of surface of a flame | frame. In this vibration power generation apparatus, since the cover part covers a part of the surface of the frame, a large amount of predetermined shape can be obtained inexpensively by forming the cover part with, for example, resin or metal such as aluminum die casting. it can.

  According to the present invention, it is possible to efficiently transmit vibrational energy to the weight while suppressing a decrease in processability.

It is a sectional view of a vibration power generator of an embodiment. It is a perspective view of a vibration power generator with a cover removed. It is a front view of a vibration power generator with a cover removed. It is a front view of a vibration power generator with the weight, the first tension coil spring and the second tension coil spring removed. It is a perspective view of a spindle, a 1st tension coiled spring, and a 2nd tension coiled spring. It is sectional drawing of the vibration electric power generating apparatus of a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the vibration power generation device according to the present embodiment is applied to a vibration power generation device that generates electric power by environmental vibration generated by a vibrating body such as equipment or a bridge. The same or corresponding elements in the drawings will be denoted by the same reference symbols, without redundant description.

  As shown in FIG. 1, the vibration power generation device 1 of this embodiment includes a frame 2, a cover 3, a coil unit 4, a weight 5, a first tension coil spring 6, and a second tension coil spring 7. Prepare.

  As shown in FIGS. 1 to 4, the frame 2 is a member that forms a housing of the vibration power generator 1 together with the cover 3. The frame 2 is formed in a box shape, a cylindrical shape, a semicylindrical shape (a cylindrical shape with a substantially circular cross section) or the like, and one surface of the frame 2 is a vibration input surface 10. The vibration input surface 10 is a surface to which vibration is input. That is, the vibration power generation device 1 directly or indirectly connects the vibration input surface 10 to the vibration body (not shown), whereby environmental vibration generated from the vibration body is transmitted from the vibration input surface 10 to the vibration power generation device 1. It is input. As a method of connecting the vibration input surface 10 to the vibrating body, for example, a method of indirectly connecting the vibration input surface 10 to the vibrating body by attaching a neodymium magnet to the frame 2 and attaching the neodymium magnet to the vibrating body; A method of directly connecting the vibration input surface 10 to the vibrating body by fixing the frame 2 to the vibrating body with a band, and a vibration input to the vibrating body by fixing the frame 2 to the vibrating body by a screw The method of connecting the surface 10 directly, etc. are mentioned. In the following description, the directions such as the upper and lower sides of the vibration power generation device 1 mean the direction in the state where the vibration input surface 10 is the lower surface and is installed on the vibrating body.

  The cover 3 is detachably attached to the side surface 11 of the frame 2. The side surface 11 is a surface adjacent to the vibration input surface 10. The side surface 11 is provided with a packing 12 for keeping the space between the cover 3 and the cover 3 airtight. The packing 12 is formed in a substantially rectangular ring shape. A substantially rectangular recess 13 is formed on the inner peripheral side of the packing 12 on the side surface 11. The recess 13 is a recess formed on the side surface 11 and is closed by the cover 3 being attached to the frame 2. The attachment of the cover 3 to the frame 2 can be performed, for example, by screwing.

  The coil unit 4 is formed in a flat plate shape. The coil unit 4 has an air core coil 14 and a coil holder 15. The air core coil 14 is one of the members that generate an induced electromotive force. The air core coil 14 is wound to have an oval shape, and the inner peripheral side is hollow. That is, the air core coil 14 has a configuration in which the iron core is not provided on the inner peripheral side of the coil. The coil holder 15 is a member that accommodates the air core coil 14 and fixes the air core coil 14 to the frame 2. The coil holder 15 is formed in a substantially rectangular shape smaller than the recess 13. And the coil holder 15 is being fixed to the flame | frame 2 in the state inserted in the recessed part 13, so that the air core coil 14 accommodated crosses the weight 5 seeing from the side 11 side. Fixing of the coil holder 15 to the frame 2 can be performed by, for example, a tape, a screw or the like. In addition, in FIG. 6, although only one one side of the coil holder 15 is being fixed to the flame | frame 2, the fixing location of the coil holder 15, the fixing number, etc. are not specifically limited. For example, two places on both sides of the coil holder 15 may be fixed to the frame 2, and four places on four sides of the coil holder 15 may be fixed to the frame 2.

  As shown in FIGS. 1 to 3 and 5, the weight 5 is a member elastically supported by the frame 2. The weight 5 includes one or more magnets 16, a yoke material 17, and a high specific gravity material 18.

  The magnet 16 is a member that provides the air core coil 14 with a magnetic field. The number of magnets 16 provided in weight 5 is not particularly limited, but in the present embodiment, four magnets 16 are provided in weight 5, and four magnets 16 are provided in the four corners of a square. It will be described as being located at a position. The magnet 16 is not particularly limited. For example, a magnet such as a neodymium magnet, an isotropic ferrite magnet, an anisotropic ferrite magnet, a samarium cobalt magnet, or an alnico magnet can be used. The shape of the magnet 16 is not particularly limited, but may be, for example, a cylindrical shape, a prismatic shape, or the like.

  The yoke material 17 is a member for collecting the magnetic flux on the air core coil 14 side of the magnet 16 by passing the magnetic flux emitted from the opposite side of the magnet 16 to the coil unit 4. For this reason, the yoke material 17 is disposed on the opposite side of the magnet 16 to the coil unit 4. The yoke material 17 is not particularly limited. For example, materials such as soft iron, rolled steel for general structure, stainless steel, silicon steel, ferrite, FeNi alloy, or FeCo alloy can be used.

The high specific gravity material 18 is a member for increasing the specific gravity of the weight 5. The high specific gravity material 18 is formed of a material having a higher specific gravity than the magnet 16 and the yoke material 17. The high specific gravity material 18 is fixed to the surface of the yoke material 17 on the air core coil 14 side and the surface of the yoke material 17 opposite to the air core coil 14. The high specific gravity material 18 is not particularly limited, and, for example, a material having a specific gravity of 8 g / cm ³ or more can be used. Such high specific gravity material 18 includes, for example, any one or two or more of materials such as tungsten, lead, copper, brass, beryllium copper, nickel steel, austenitic stainless steel, and high-speed tool steel. It can be done.

  The first tension coil spring 6 and the second tension coil spring 7 are members which are connected to the frame 2 and elastically support the weight 5 from opposite directions. Each of the first tension coil spring 6 and the second tension coil spring 7 is constituted by a plurality of coils, and is disposed at mutually opposing positions. In the present embodiment, the first tension coil spring 6 and the second tension coil spring 7 are each configured of six. Here, in the present embodiment, the first tension coil spring 6 and the second tension coil spring 7 are connected to the upper and lower surfaces of the yoke material 17, respectively. However, the present invention is not limited to this. For example, the first tension coil spring 6 and the second tension coil spring 7 may be connected to the upper and lower surfaces of the yoke material 17 three or more each. For example, the number of coil springs connected to the yoke material 17 may be determined according to the spring constant required when vibrating the weight 5. A plurality of first tension coil springs 6 may be arranged in two rows on the upper surface of the yoke material 17 along the upper direction. Similarly, the plurality of second tension coil springs 7 may be arranged in two rows in the lower direction on the lower surface of the yoke material 17. In addition, four first tension coil springs 6 may be connected to the four corners of the upper surface of the yoke material 17, respectively. Similarly, four second tension coil springs 7 may be connected to the four corners of the lower surface of the yoke material 17, respectively. In addition, even when the plurality of first tension coil springs 6 and the second tension coil springs 7 are connected to the yoke material 17 as described above, the first tension coil spring 6 and the second tension coil spring 7 are symmetrical with respect to the vertical center position in the vertical direction. Preferably, one tension coil spring 6 and a second tension coil spring 7 are arranged.

  Here, a portion of the frame 2 to which the first tension coil spring 6 is connected is referred to as a first connection portion 21, and a portion to which the second tension coil spring 7 of the frame 2 is connected is referred to as a second connection portion 22. In the present embodiment, the first connection portion 21 is the side surface 11 located above the recess 13, and the second connection portion 22 is the side surface 11 below the recess 13.

  One end of the first tension coil spring 6 is connected to the first connecting portion 21 of the frame 2 by the first connecting member 23. One end of the second tension coil spring 7 is connected to the second connecting portion 22 of the frame 2 by the second connecting member 24. In the present embodiment, the first connecting member 23 and the second connecting member 24 are screws. Then, by screwing the first connection member 23 that locks the one end of the first tension coil spring 6 into the first connection portion 21, the one end of the first tension coil spring 6 is connected to the first connection portion 21. ing. Further, by screwing the second connection member 24 locking the one end of the second tension coil spring 7 into the second connection portion 22, one end of the second tension coil spring 7 is connected to the second connection portion 22. ing. The first connecting member 23 and the second connecting member 24 may be pins inserted into and locked to the side surface 11 of the frame 2. In this case, a pin which is the first connecting member 23 and the second connecting member 24 is inserted into and locked to the side surface 11 of the frame 2, and the first tension coil spring 6 and the second tension coil spring 7 are locked to this pin. Thus, the first tension coil spring 6 and the second tension coil spring 7 can be coupled to the side surface 11 of the frame 2.

  The frame 2, the first connecting member 23 and the second connecting member 24 are formed of a material having a Vickers hardness of 700 or less. In this case, the Vickers hardness is preferably 550 or less, and more preferably 400 or less. Examples of the material of the frame 2 having such hardness, the first connection member 23 and the second connection member 24 include stainless steel, aluminum, copper, brass, brass, beryllium copper and the like.

  The frame 2, the first connecting member 23 and the second connecting member 24 may be formed of a material having a Young's modulus of 40 GPa or more. In this case, the Young's modulus is preferably 60 GPa or more, and more preferably 100 GPa or more. Since the frame 2 is formed of such a material, in the frame 2, the vibration input surface 10 and the first connection portion 21 and the second connection portion 22 preferably have a Young's modulus of 40 GPa or more, preferably 60 GPa. More preferably, they are connected by a material of 100 GPa or more.

  The other ends of the first tension coil spring 6 and the second tension coil spring 7 are connected to the weight 5. Specifically, the other end of the first tension coil spring 6 is connected to a portion on the first connection portion 21 side of the weight 5, and the other end of the second tension coil spring 7 is a second weight of the weight 5. It is connected to the part by the side of 2 connection part 22. The connection of the first tension coil spring 6 and the second tension coil spring 7 to the weight 5, for example, divides the yoke material 17 into two, and the first tension coil spring 6 and the second tension coil spring 7 It can be carried out by locking and pinching the other end of the. However, the other ends of the first tension coil spring 6 and the second tension coil spring 7 may be connected to any of the members constituting the weight 5.

  The weight 5 is elastically supported in a suspended state by the first tension coil spring 6 and the second tension coil spring 7 so that the magnet 16 and the coil unit 4 face each other and a gap is formed between the magnet 16 and the coil unit 4. . Further, the weight 5 can vibrate in the vertical direction D with respect to the frame 2 by resisting the elastic force of the first tension coil spring 6 and the second tension coil spring 7. Then, when the weight 5 vibrates in the vertical direction D with respect to the frame 2, the magnet 16 vibrates with respect to the air core coil 14, so the flux linkage of the air core coil 14 changes. As a result, an induced electromotive force is generated in the air core coil 14. Therefore, the air core coil 14 and the magnet 16 function as a power generation unit that generates an induced electromotive force by vibrating the weight 5 with respect to the frame 2. The weight 5 (the magnet 16, the yoke material 17, and the high specific gravity material 18) functions as a vibrator in the vibration power generation device 1, and the frame 2, the cover 3, and the coil unit 4 (air core coil 14 and coil holder) 15) functions as a stator in the vibration power generator 1.

  When generating power using the vibration power generation device 1 configured in this manner, the vibration power generation device 1 is installed (fixed to the vibration body so that the vibration input surface 10 is directly or indirectly connected to the vibration body) ). The installation of the vibration power generation device 1 with respect to the vibration body can be performed, for example, by screwing, bonding, or the like.

  Then, environmental vibration from the vibrating body is input to the vibration power generation device 1 from the vibration input surface 10. In the vibration power generator 1, since the weight 5 is elastically supported by the first tension coil spring 6 and the second tension coil spring 7 on the frame 2, the weight 5 (the magnet 16, the yoke material 17, and the high specific gravity material 18) is The frame 2, the cover 3, and the coil unit 4 (air core coil 14 and coil holder 15) vibrate in the vertical direction D. At this time, by setting the spring constants of the first tension coil spring 6 and the second tension coil spring 7 so that the weight 5 resonates with the environmental vibration generated by the vibrator, the weight 5 is made to resonate. , Its amplitude can be increased. The spring constants of the first tension coil spring 6 and the second tension coil spring 7 can be set by, for example, the number of the first tension coil spring 6 and the second tension coil spring 7, the number of turns, the wire diameter, and the like. Then, the magnet 16 vibrates with respect to the air core coil 14 and the linkage flux of the air core coil 14 changes, whereby an induced electromotive force is generated in the air core coil 14. Thereby, the vibration power generator 1 generates power.

  Thus, in the vibration power generation device 1 according to the present embodiment, since the Vickers hardness of the frame 2 is 700 or less, the frame 2 is hardened so that vibration energy can be efficiently transmitted to the weight 5. Even in this case, it is possible to suppress the deterioration of the processability of the frame 2.

  Further, in the frame 2, the vibration input surface 10 and the first connection portion 21 and the second connection portion 22 are connected by a material having a Young's modulus of 40 GPa or more, so the vibration input from the vibration input surface 10 is It is possible to suppress attenuation before being transmitted to the first connection portion 21 and the second connection portion 22. For this reason, vibrational energy can be efficiently transmitted to the weight 5.

  In addition, since the first connection member 23 and the second connection member 24 are formed of a material having a Young's modulus of 40 GPa or more, vibration occurs at the connection position between the frame 2 and the first tension coil spring 6 and the second tension coil spring 7 It can suppress being attenuated.

  As mentioned above, although the suitable embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment.

  For example, the frame does not have to be made of one material, but may be made of a plurality of materials. The vibration power generation apparatus may also include a cover that covers a part of the surface of the frame. For example, the vibration power generation device 1A shown in FIG. 6 includes a cover portion 31A that covers a part of the surface of the frame 2A. The cover portion 31A can be formed of a resin that can be manufactured inexpensively and in large quantities, or a metal such as an aluminum die cast. The cover 31A may be formed of the same material as the frame 2A. As described above, by covering part of the surface of the frame 2A with the cover portion 31A, a predetermined shape can be obtained inexpensively and in large quantities. When the cover portion 31A is made of resin, the vibration input surface 10A is exposed from the cover portion 31A in order to suppress the attenuation of the vibration when the vibration is input from the vibration input surface 10A. preferable. The productivity is further improved by making the cover 3A of resin.

  In the above embodiment, the vibration input surface is described as a specific surface of the frame, but the vibration input surface may be any surface of the frame. Also, the vibration input surface does not have to be the whole of one surface of the frame, but may be only a part of the one surface of the frame.

  1, 1A: vibration power generator, 2, 2A: frame, 3, 3A: cover, 4: coil unit, 5: cone, 6: first tension coil spring, 7: second tension coil spring, 10, 10A: vibration input Surface 11 11 Side 12 Packing 12 Recess 14 Air core coil (power generation unit) 15 Coil holder 16 Magnet (power generation unit) 17 Yoke material 18 High specific gravity material 21 First connecting portion, 22: second connecting portion, 23: first connecting member, 24: second connecting member, 31A: cover portion.

Claims (4)

A frame into which vibrations are input,
A weight elastically supported by the frame;
A first tension coil spring and a second tension coil spring which are connected to the frame and elastically support the weight from opposite directions;
A power generation unit that generates an induced electromotive force by vibrating the weight relative to the frame;
The Vickers hardness of the frame is 700 or less.
Vibration generator. The frame has a vibration input surface to which vibration is input, a first connecting portion to which the first tension coil spring is connected, and a second connecting portion to which the second tension coil spring is connected,
In the frame, the vibration input surface and the first connection portion and the second connection portion are connected by a material having a Young's modulus of 40 GPa or more.
The vibration power generation device according to claim 1. A first connection member connecting the first tension coil spring to the frame at the first connection portion;
A second connection member connecting the second tension coil spring to the frame in the second connection portion;
The first connection member and the second connection member are formed of a material having a Young's modulus of 40 GPa or more.
The vibration power generation device according to claim 2. It further comprises a cover part which covers a part of surface of said frame,
The vibration power generation device according to any one of claims 1 to 3.

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