WO2016076382A1 - Power generation device and power generation system - Google Patents

Abstract

This power generation device 100, which is used fixed to a vibrating body, is provided with: a first magnet 31; a power generation unit 10 which comprises a coil 40 which is spaced away from and surrounds the outer periphery of the first magnet 31, and springs (60U, 60L) which, relative to the coil 40, displace the first magnet along the magnetization direction thereof; and a second magnet 910 which, when the power generation device 100 is fixed to the vibrating body and this is in a resting state, is arranged at or near the position of the first magnet 31 in a natural state, in which no external force is applied to the power generation unit 10, so as to bring a repulsive force to bear on the first magnet 31 so as to hold the first magnet 31.

Description

Power generation device and power generation system

The present invention relates to a power generation apparatus and a power generation system.

In recent years, in order to generate power efficiently in a small space, a power generator is attached to a vibrating body such as a rotating device equipped with a motor such as a duct, a pump, a fan, and a turbine, and power is generated using the vibration of the vibrating body. Attempts have been made (see, for example, Patent Document 1). The power generation device described in Patent Literature 1 includes a magnet, a coil that is provided on the outer peripheral side of the magnet and is fixed to the vibrating body, and a coil spring that connects the magnet and the vibrating body. In such a power generation device, the magnet is moved relative to the coil by the vibration of the vibrating body to generate a voltage accompanying electromagnetic induction in the coil.

The vibrating body to which the power generator is fixed is generally made of a magnetic material such as steel. Therefore, in the power generation device of Patent Document 1, an attractive force due to magnetic interaction acts between the magnet and the vibrating body, and the position of the magnet with respect to the coil is displaced to the vibrating body side from the standard position. When this displacement increases, the amount of displacement of the magnet with respect to the coil during vibration of the power generation device decreases, and as a result, the power generation amount of the power generation device becomes smaller than the design value. Further, when the nonlinearity of the coil spring appears due to this displacement, the spring constant changes, and the frequency characteristic of the power generation amount deviates from the design value.

In order to prevent characteristics such as the power generation amount and frequency characteristics of the power generation device from deviating from the design values, it is conceivable to sufficiently increase the distance between the magnet and the vibration body while the power generation device is attached to the vibration body. However, in such a configuration, it is necessary to increase the size of the power generation device in the thickness direction, and thus it is necessary to secure a large installation space.

Japanese Patent Laid-Open No. 10-66323

The present invention has been devised in view of the above-described conventional problems, and an object of the present invention is to provide a power generation device capable of generating power generation efficiently by surely expressing characteristics at the time of designing the power generation device, and a power generation system including such a power generation device. It is to provide.

Such an object is achieved by the present invention of the following (1) to (11).
(1) A power generation device fixed to a vibrating body and used.
A first magnet, a coil spaced apart from the first magnet and surrounding the outer periphery thereof, and the first magnet relative to the coil along its magnetization direction. A power generation unit comprising a spring to be displaced to
When the power generation device is fixed to the stationary vibration body, the first magnet is held at or near the position of the first magnet in a natural state where no external force is applied to the power generation unit. And a second magnet arranged to exert a repulsive force on the first magnet.

(2) The power generation device according to (1), wherein the second magnet is provided along the magnetization direction of the first magnet.

(3) Each of the first magnet and the second magnet has a block shape,
The power generation apparatus according to (2), wherein the second magnet is provided such that a central axis in a magnetization direction thereof overlaps a central axis in the magnetization direction of the first magnet.

(4) The vibrating body is made of a magnetic material,
The power generation device according to any one of (1) to (3), wherein the power generation device is fixed to the vibrating body via the second magnet.

(5) The power generation device according to (4), wherein the magnitude of the repulsive force of the second magnet with respect to the first magnet is substantially equal to the magnitude of the attractive force of the first magnet with respect to the vibrating body.

(6) The power generation device according to (4) or (5), wherein the power generation device is configured such that an attractive force of the second magnet to the vibrating body is greater than a weight thereof.

(7) The power generation device includes the second magnet, and has a suction unit that attaches the power generation device to the vibrating body.
The adsorbing means is flexible and is provided between the sheet material holding the second magnet and the sheet material and the second magnet, and The power generation device according to any one of (4) to (6), further including a yoke for fixing a magnet.

(8) The attracting means further includes a plurality of third magnets,
The sheet material has a plurality of fixing portions that are fixed to the power generation portion, and a holding portion that extends to the side of the fixing portion and holds the third magnet at an end opposite to the fixing portion. The power generation device according to (7), further including an arm portion.

(9) The power generation device according to (8), wherein when the power generation device is placed on a flat surface, each of the arm portions has a length such that the holding portion is positioned outside the device main body.

(10) The second magnet according to any one of (1) to (3), wherein the second magnet is attached to a side of the power generation unit opposite to the vibration body when the power generation device is fixed to the vibration body. Power generator.

(11) The power generation device according to any one of (1) to (10) above,
A power generation system comprising: a vibrating body made of a magnetic material for fixing the power generation device.

According to the present invention, by applying a repulsive force from the second magnet to the first magnet, the first magnet applies an external force to the power generation unit when the power generation device is fixed to the stationary vibration body. It is held at or near the position of the first magnet in the natural state. Therefore, the vibration of the vibrating body can displace the first magnet relative to the coil with reference to the standard position (the position of the first magnet in a natural state where no external force is applied to the power generation unit). . As a result, the power generation apparatus can reliably generate the design characteristics (power generation amount and frequency characteristics) and efficiently generate power.

FIG. 1 is a perspective view showing a first embodiment of a power generator of the present invention. FIG. 2 is a plan view of the power generator shown in FIG. FIG. 3 is an exploded perspective view of the apparatus main body included in the power generation apparatus shown in FIG. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a plan view of a leaf spring included in the apparatus main body shown in FIG. FIG. 6 is an exploded perspective view of the suction means included in the power generation device shown in FIG. 1. 7 is a cross-sectional view taken along line BB in FIG. FIG. 8 is a schematic diagram for explaining the magnetic interaction between the first magnet, the second magnet, and the vibrating body in a state where the power generation device shown in FIG. 1 is fixed to the vibrating body. FIGS. 9 (a-1) and 9 (a-2) respectively show the magnet assembly of the power generation unit and the magnet assembly of the attracting means in a state where the power generation device shown in FIGS. 1 to 4 is fixed to the vibrating body. It is the analysis figure which analyzed the magnetic field which generate | occur | produces between, and the graph which shows the relationship between the separation distance of a 1st magnet and a 2nd magnet, and the magnitude | size of the force which acts on a 1st magnet. 9 (b-1) and FIG. 9 (b-2) show power generation in which the first magnet and the second magnet of the power generation apparatus shown in FIGS. 1 to 4 are arranged so that the opposite poles face each other. An analysis diagram analyzing a magnetic field generated between the magnet assembly of the power generation unit and the magnet assembly of the attracting means in a state where the apparatus is fixed to the vibrating body, and a separation distance between the first magnet and the second magnet It is a graph which shows the relationship between the magnitude | size of the force which acts on a 1st magnet. FIG. 10 is a diagram illustrating a use state (fixed state) of the power generation device illustrated in FIG. 1. 11 is an enlarged side view showing the power generation device shown in FIG. FIG. 12 is a diagram illustrating another usage state (fixed state) of the power generation device illustrated in FIG. 1. FIG. 13 is a longitudinal sectional view of a second embodiment of the power generator of the present invention.

Hereinafter, a power generator according to the present invention will be described based on preferred embodiments shown in the accompanying drawings.
<First Embodiment>
First, a first embodiment of the power generator of the present invention will be described.

FIG. 1 is a perspective view showing a first embodiment of a power generator according to the present invention. FIG. 2 is a plan view of the power generator shown in FIG. FIG. 3 is an exploded perspective view of the apparatus main body included in the power generation apparatus shown in FIG. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a plan view of a leaf spring included in the apparatus main body shown in FIG. FIG. 6 is an exploded perspective view of the suction means included in the power generation device shown in FIG. 1. 7 is a cross-sectional view taken along line BB in FIG. FIG. 8 is a schematic diagram for explaining the magnetic interaction between the first magnet, the second magnet, and the vibrating body in a state where the power generation device shown in FIG. 1 is fixed to the vibrating body. FIG. 9 shows the magnet assembly of the power generation unit in a state where the power generation device shown in FIGS. 1 to 4 and the power generation device in which the first magnet and the second magnet are arranged so that the opposite poles face each other are fixed to a vibrating body. An analysis diagram analyzing the magnetic field generated between the solid and the magnet assembly of the attracting means, and showing the relationship between the distance between the first magnet and the second magnet and the magnitude of the force acting on the first magnet It is a graph. FIG. 10 is a diagram illustrating a use state (fixed state) of the power generation device illustrated in FIG. 1. 11 is an enlarged side view showing the power generation device shown in FIG. FIG. 12 is a diagram illustrating another usage state (fixed state) of the power generation device illustrated in FIG. 1.

In the following description, the upper side in FIGS. 1, 3, 4, and 6 to 12 is referred to as “upper” or “upper”, and the lower side is referred to as “lower” or “lower”. 2 and FIG. 5 is referred to as “upper” or “upper”, and the rear side of the page is referred to as “lower” or “lower”.

1 and 2 is an apparatus that is used by being fixed to a vibrating body made of a magnetic material. Such a power generation device 100 is provided with a device main body 1, suction means 9 for fixing the device main body 1 to the vibrating body by suction, and a connection that is provided so as to protrude laterally from the device main body 1 and is connected to an external device. Connector 11.

As shown in FIG. 3, the apparatus main body 1 includes a housing 20 and a power generation unit 10 that is held in the housing 20 so as to vibrate in the vertical direction of FIG. 4. The power generation unit 10 includes a pair of opposed upper leaf springs 60U and lower leaf springs 60L, a magnet assembly 30 having a permanent magnet (first magnet 31) fixed between them, and a first magnet 31. A coil 40 provided so as to surround the outer peripheral side of the coil and a coil holding part 50 for holding the coil 40. In the present embodiment, the upper leaf spring 60U and the lower leaf spring 60L have the same structure.

<< Case 20 >>
As shown in FIGS. 3 and 4, the housing 20 includes a cover 21, a base (support plate) 23 that supports the power generation unit 10 on the upper surface (one surface) side, and a space between the cover 21 and the base 23. And a cylindrical part 22 provided so as to surround the power generation part 10.

The cover 21 has a disk shape, and an annular (ring-shaped) rib 211 is formed so as to protrude downward along the outer peripheral edge thereof. Along the portion corresponding to the rib 211, six through holes 212 are formed at approximately equal intervals. In addition, a concave portion (a relief portion) 214 that is recessed upward is formed in a portion inside the rib 211 of the cover 21. The power generation unit 10 is configured so as to be positioned (withdrawn) in the recess 214 and not to contact the cover 21 when vibrated.

The cylindrical portion 22 has a cylindrical shape, and its outer diameter is substantially equal to the outer diameter of the cover 21. In a state in which the power generation unit 10 and the housing 20 are assembled (hereinafter, this state is referred to as an “assembly state”), a main portion that contributes to power generation of the power generation unit 10 is located inside the cylindrical portion 22.

Further, six bosses 221 are formed on the inner peripheral surface of the cylindrical portion 22 at positions corresponding to the through holes 212 of the cover 21 along the height direction of the cylindrical portion 22. An upper screw hole 221 a is formed at the upper end of the boss 221. In addition, six through holes 66 are formed in the outer peripheral portion (first annular portion 61) of the upper leaf spring 60U at substantially equal intervals along the circumferential direction.

With the outer peripheral portion of the upper leaf spring 60U positioned between the cover 21 and the cylindrical portion 22, the screw 213 is inserted into the through hole 212 of the cover 21 and the through hole 66 of the upper leaf spring 60U, and the boss 221 is inserted. Screwed into the upper screw hole 221a. Thereby, the outer peripheral portion of the upper leaf spring 60 </ b> U is fixed to the cover 21 and the cylindrical portion 22.

The base 23 has a disk shape, and an annular (ring-shaped) rib 231 is formed to protrude upward along the outer peripheral edge portion thereof. Six through holes 232 are formed at substantially equal intervals along the portion corresponding to the rib 231. In addition, a concave portion (relief portion) 234 that is recessed downward is formed in a portion inside the rib 231 of the base 23. The power generation unit 10 is configured to be positioned (withdrawn) in the recess 234 and not to contact the base 23 when vibrated.

Further, a lower screw hole (female screw) 221b is formed at the lower end of the boss 221 of the cylindrical portion 22. With the outer peripheral portion (first annular portion 61) of the lower leaf spring 60L positioned between the base 23 and the cylindrical portion 22, the screw 233 passes through the through hole 232 of the base 23 and the lower leaf spring 60L. It is inserted through the hole 66 and screwed into the lower screw hole 221b of the boss 221. Thereby, the outer peripheral part of the lower leaf spring 60 </ b> L is fixed to the base 23 and the cylindrical part 22.

As shown in FIG. 4, the lower surface (the other surface) 230 of the base 23 is formed of a curved convex surface protruding downward. In addition, the effect acquired by setting it as this structure is demonstrated later. Further, a concave portion 235 capable of accommodating a permanent magnet (second magnet) 910 constituting a part of the attracting means 9 is formed in the central portion of the lower surface 230 of the base 23.

Although it does not specifically limit as a material which comprises the housing | casing 20 (the cover 21, the cylindrical part 22, and the base 23), For example, a metal material, a ceramic material, a resin material etc. are mentioned, These 1 type or 2 types or more Can be used in combination.

The dimensions of the housing 20 are not particularly limited, but from the viewpoint of downsizing (lowering the height) the power generation apparatus 100, the average width of the housing 20 (base 23) is preferably about 60 to 120 mm. The average height of the housing 20 is preferably about 20 to 50 mm, more preferably about 30 to 40 mm.

The power generation unit 10 is held in the housing 20 so as to be vibrated by an upper leaf spring 60U and a lower leaf spring 60L.

<< Upper leaf spring 60U, lower leaf spring 60L >>
The upper leaf spring 60U is fixed by sandwiching the outer peripheral portion between the cover 21 and the cylindrical portion 22 between them. The lower leaf spring 60L is fixed by sandwiching the outer peripheral portion between the base 23 and the cylindrical portion 22 between them.

Each of the leaf springs 60L and 60U is a member formed of a metal thin plate material such as iron or stainless steel, and the entire shape thereof is a disk shape. As shown in FIG. 5, each of the leaf springs 60 </ b> L and 60 </ b> U includes, from the outer peripheral side, a first annular portion 61, a second annular portion 62 having an outer diameter smaller than the inner diameter of the first annular portion 61, and A third annular portion 63 having an outer diameter smaller than the inner diameter of the second annular portion 62 is provided.

The first annular portion 61, the second annular portion 62, and the third annular portion 63 are provided concentrically. The first annular portion 61 and the second annular portion 62 are connected by a plurality of (six in this embodiment) first spring portions 64, and the second annular portion 62 and the third annular portion 62 are connected to each other. Are connected by a plurality (three in this embodiment) of second spring portions 65.

In the first annular portion 61, six through holes 66 are formed at substantially equal intervals (approximately 60 ° intervals) along the circumferential direction. As described above, the screw 213 screwed into the upper screw hole 221a of the boss 221 is inserted into the through hole 66 of the upper leaf spring 60U, while the through hole 66 of the lower leaf spring 60L is inserted into the through hole 66 of the boss 221. A screw 233 to be screwed into the lower screw hole 221b is inserted.

Also, six through holes 67 are formed in the second annular portion 62 at substantially equal intervals (approximately 60 ° intervals) along the circumferential direction. In addition, six bosses 511 are formed in the coil holding portion 50 described later so as to protrude in the vertical direction along the circumferential direction. Each boss 511 is formed with an upper screw hole 511a at its upper end and a lower screw hole 511b at its lower end.

The screw 82 is inserted into the through hole 67 of the upper leaf spring 60U and screwed into the upper screw hole 511a of the boss 511. Thereby, the second annular portion 62 of the upper leaf spring 60 </ b> U is fixed to the coil holding portion 50. On the other hand, the screw 82 is inserted into the through hole 67 of the lower leaf spring 60L and screwed into the lower screw hole 511b of the boss 511. Thereby, the second annular portion 62 of the lower leaf spring 60 </ b> L is fixed to the coil holding portion 50.

Also, a spacer 70 disposed above the magnet assembly 30 is fixed to the third annular portion 63 of the upper leaf spring 60U. On the other hand, the magnet assembly 30 is fixed to the third annular portion 63 of the lower leaf spring 60L. In the present embodiment, the spacer 70 and the magnet assembly 30 are connected by the screw 73.

Each of the six first spring portions 64 has a shape having an arcuate portion (substantially S-shape), and is disposed between the first annular portion 61 and the second annular portion 62. Yes. Specifically, a pair of first spring portions 64 that are opposed to each other via the second annular portion 62 (coil holding portion 50) has three sets (centering on the central axis of the third annular portion 63). Placed at the position of the object to be rotated. One end of each first spring portion 64 is connected to the first annular portion 61 in the vicinity of the through hole 66 of the first annular portion 61, and the arc-shaped portions are the first annular portion 61 and the second annular portion. The other end extends counterclockwise (counterclockwise) along the circumferential direction of the portion 62, and the other end is connected to the second annular portion 62 in the vicinity of the through hole 67 of the second annular portion 62.

The six first spring portions 64 support (connect) the second annular portion 62 with respect to the first annular portion 61 so as to vibrate in the vertical direction of FIG. As described above, the first annular portion 61 is fixed to the housing 20, and the second annular portion 62 is fixed to the coil holding portion 50. Therefore, when vibration from the vibrating body is transmitted to the housing 20, this vibration is transmitted to the second annular portion 62 via the first spring portion 64, and the coil holding portion 50 is moved with respect to the housing 20. Vibrate.

On the other hand, each of the three second spring portions 65 has a shape having an arcuate portion (substantially S-shape), and is disposed between the second annular portion 62 and the third annular portion 63. Has been. Specifically, the three second spring portions 65 are disposed at positions to be rotated around the central axis of the third annular portion 63 (magnet assembly 30). One end of each second spring portion 65 is connected to the second annular portion 62 in the vicinity of the through hole 67 of the second annular portion 62, and the arc-shaped portion is the second annular portion 62 and the third annular portion. It extends clockwise (clockwise) along the circumferential direction of the portion 63, and the other end is connected to the third annular portion 63.

The three second spring portions 65 support (connect) the third annular portion 63 with respect to the second annular portion 62 so as to vibrate in the vertical direction of FIG. As described above, the second annular portion 62 is fixed to the coil holding portion 50, and the third annular portion 63 is directly or indirectly fixed to the magnet assembly 30. Therefore, the vibration from the vibrating body transmitted to the second annular portion 62 is transmitted to the third annular portion 63 via the second spring portion 65, and the magnet assembly 30 is moved to the coil holding portion 50. Vibrate.

Thus, as shown in FIG. 5, each leaf spring 60L, 60U has a rotationally symmetric shape with its center axis (the center axis of the third annular portion 63) as the center. Thereby, it can prevent that the spring constant of the 1st spring part 64 and the 2nd spring part 65 in the circumferential direction of each leaf | plate spring 60L and 60U arises. Therefore, it is possible to improve the rigidity (lateral rigidity) in a direction substantially orthogonal to the thickness direction of the plate springs 60L and 60U as a whole. Further, when assembling the power generation apparatus 100 (apparatus body 1), the work can be performed more easily.

In the apparatus main body 1 configured as described above, the first vibration system in which the coil holding part 50 vibrates via the first spring part 64 with respect to the housing 20 and the second spring with respect to the coil holding part 50. A second vibration system in which the magnet assembly 30 vibrates via the portion 65 is formed. In other words, in the apparatus main body 1, the power generation unit 10 constitutes a two-degree-of-freedom vibration system having a first vibration system and a second vibration system.

In such a two-degree-of-freedom vibration system power generation unit 10, the mass of the coil holding unit 50 (hereinafter sometimes simply referred to as “coil holding unit 50”) in which the first vibration system holds the coil. : and m _1, the mass ratio of the coil holder 50 and the magnet assembly 30: a mu, the spring constant of the first spring portion 64: k ₁ as the first natural frequency is determined by: have a omega ₁ The second vibration system includes the mass of the magnet assembly 30: m ₂ , the mass ratio of the coil holding unit 50 and the magnet assembly 30: μ, and the spring constant of the second spring portion 65: k ₂ in a second natural frequency that is determined: with a omega _2.
Here, each natural frequency ω ₁ , ω ₂ can be expressed by the following equation of motion (1).

That is, the natural frequencies ω ₁ and ω ₂ of the two-degree-of-freedom vibration system are determined by the three parameters μ, Ω ₁ , and Ω ₂ .

The power generation amount (power generation capacity) of the two-degree-of-freedom vibration system represented by the above formula (1) is accompanied by attenuation due to power generation, and two resonance frequencies f _{1 and} f resulting from the respective natural frequencies ω ₁ and ω _{2 The} maximum value is taken at ₂ . In the power generation apparatus 100, the power generation unit 10 vibrates efficiently with respect to the housing 20 over the frequency band between the _two resonance frequencies (f _1, f ₂ ). When there is no damping, the natural frequencies ω ₁ and ω ₂ coincide with the resonance frequencies f ₁ and f ₂ .

Accordingly, the mass (m ₁ , m ₂ ) and the spring constant (k ₁ , k ₂ ) of each vibration system are adjusted, and the resonance frequency f ₁ of the first vibration system and the resonance frequency f ₂ of the second vibration system. Are set to different values (doubled), the power generation unit 10 can be efficiently vibrated with respect to the external vibration (vibration applied to the casing 20) in the set frequency band. .

For example, when the frequency band in which vibration of the vibrating body is strongly generated is about 20 to 40 Hz, the mass (m ₁ , m ₂ ) and the spring constant (k ₁ , k ₂ ) of each vibration system are expressed by the following formulas: By adjusting so as to satisfy the conditions (1A) to (3A), the power generation efficiency of the power generation apparatus 100 with respect to this vibrating body can be particularly improved.

m ₁ [kg]: m ₂ [kg] = 1.5: 1 (1A)
m ₁ [kg]: k ₁ [N / m] = 1: 60000 (2A)
m ₂ [kg]: k ₂ [N / m] = 1: 22000 (3A)

In addition, as a vibrating body that vibrates strongly in such a frequency band, an air conditioning duct as described later can be cited.

Each leaf spring 60L, the average thickness of 60U, the spring constant of the spring portions 64 and 65 of the _(k 1, _{k 2)} can be appropriately adjusted to a desired value. Specifically, the average thickness of each leaf spring 60L, 60U is preferably about 0.1 to 0.4 mm, and more preferably about 0.2 to 0.3 mm. If the average thickness of each leaf spring 60L, 60U is within the above range, the occurrence of plastic deformation, breakage, etc. of each leaf spring 60L, 60U can be reliably prevented. Thereby, it is possible to use the power generation device 100 for a long time in a state where the power generation device 100 is attached to the vibrating body.

A magnet assembly 30 having a first magnet 31 is provided between the upper leaf spring 60U and the lower leaf spring 60L.

<< Magnet assembly 30 >>
The magnet assembly 30 includes a first magnet 31 that is a cylindrical permanent magnet, a bottomed cylindrical back yoke 32, and a disk-shaped yoke 33 provided on the first magnet 31. Yes. In the magnet assembly 30, the outer peripheral portion of the bottom surface of the back yoke 32 is fixed to the third annular portion 63 of the lower leaf spring 60 </ b> L, and the yoke 33 is connected to the third annular portion 63 of the upper leaf spring 60 </ b> U via the spacer 70. It is fixed to.

The first magnet 31 is arranged with the S pole on the upper side and the N pole on the lower side. Thereby, the 1st magnet 31 (magnet assembly 30) is displaced along the magnetization direction (up-down direction).

Examples of the first magnet 31 include an alnico magnet, a ferrite magnet, a neodymium magnet, a samarium cobalt magnet, and a magnet (bond magnet) formed by molding a composite material obtained by pulverizing them and kneading them into a resin material or a rubber material. Can be used. The first magnet 31 is fixed to the back yoke 32 and the yoke 33 by, for example, adsorption by the magnetic force of the first magnet 31 itself, adhesion by an adhesive, or the like.

The size of the yoke 33 in plan view is substantially equal to the size of the first magnet 31 in plan view. A screw hole 331 is formed in the central portion of the yoke 33.

The back yoke 32 includes a bottom plate portion 321 and a cylindrical portion 322 erected along the outer peripheral portion thereof. The first magnet 31 is disposed concentrically with the cylindrical portion 322 at the center of the bottom plate portion 321. Further, the bottom plate portion 321 is formed with a through hole at the center thereof. In the magnet assembly 30 configured to include the back yoke 32, the magnetic flux generated by the first magnet 31 can be increased.

The constituent materials of the back yoke 32 and the yoke 33 are, for example, pure iron (for example, JIS SUY), soft iron, carbon steel, electromagnetic steel (silicon steel), high-speed tool steel, and structural steel (for example, JIS SS400). , Stainless steel, permalloy and the like, and one or more of them can be used in combination.
A coil holding unit 50 is provided between the magnet assembly 30 and the housing 20.

<< Coil holding part 50 >>
The coil holding part 50 includes a main body part 51 having a cylindrical shape as a whole and an annular disk part 52 located on the inner peripheral side of the main body part 51.

The main body 51 has a shape such that a cylindrical block is cut from the vertical direction. The main body 51 is formed with six bosses 511 protruding in the vertical direction along the circumferential direction. An upper screw hole 511a and a lower screw hole 511b into which the screw 82 is screwed are formed at the upper end portion and the lower end portion of each boss 511, respectively.

The disk part 52 is formed integrally with the main body part 51, and its inner diameter is formed larger than the outer diameter of the spacer 70 (main body part 71). A coil 40 is held on the inner peripheral side of the lower surface of the disk portion 52.

<< Coil 40 >>
The outer diameter of the coil 40 is smaller than the cylindrical portion 322 of the back yoke 32, and the inner diameter is set larger than the outer diameters of the first magnet 31 and the yoke 33. Thereby, the coil 40 is arrange | positioned in the assembled state between the cylindrical part 322 of the back yoke 32, and the 1st magnet 31, spaced apart from these (it does not contact these).

The coil 40 is displaced in the vertical direction relative to the first magnet 31 by the vibration of the power generation unit 10. At this time, the density of magnetic lines of force from the first magnet 31 passing through the coil 40 changes, and a voltage is generated in the coil 40.

The coil 40 is formed by, for example, winding a wire material in which a copper base wire is coated with an insulating film, a wire material in which a copper base wire is coated with an insulating film having a fusion function added, or the like. The number of windings of the wire is appropriately set according to the cross-sectional area of the wire, and is not particularly limited. Further, the cross-sectional shape of the wire may be any shape such as a polygon such as a triangle, a square, a rectangle and a hexagon, a circle and an ellipse.

Note that both ends of the wire constituting the coil 40 are connected to the connection connector 11 via a voltage extraction portion (not shown) provided on the upper side of the disk portion 52 of the coil holding portion 50. By connecting the connection connector 11 to an electric circuit such as a wireless communication device, for example, the power generation device 100 can be used as a power source for the electric circuit.

The magnet assembly 30 is connected to the upper leaf spring 60U via the spacer 70.

<< Spacer 70 >>
The spacer 70 includes a bottomed cylindrical main body 71 and an annular flange 72 formed integrally with the main body 71 along the outer periphery of the upper end of the main body 71. The bottom of the main body 71 is connected to the magnet assembly 30 (yoke 33) by a screw 73. The third annular portion 63 of the upper leaf spring 60U is fixed to the outer peripheral side of the lower surface of the flange portion 72.

As a material constituting the spacer 70, for example, magnesium, aluminum, molding resin, or the like can be used.

In such a device main body 1, as shown in FIG. 4, when vibration is transmitted from the vibrating body to the housing 20, the power generation unit 10 vibrates in the vertical direction inside the housing 20. More specifically, the coil holding portion 50 vibrates in the vertical direction with respect to the housing 20 via the first spring portions 64 of the leaf springs 60U and 60L (that is, the first vibration system vibrates). To do). Similarly, the magnet assembly 30 vibrates in the vertical direction with respect to the coil holding portion 50 via the second spring portions 65 of the leaf springs 60U and 60L (that is, the second vibration system vibrates). To do).

Each leaf spring 60U, 60L has a larger spring constant in the direction (lateral direction) substantially orthogonal to the vibration direction than the spring constant in the vibration direction of each spring portion 64, 65 due to its structure. That is, each of the leaf springs 60U and 60L has higher lateral stiffness (lateral stiffness) than its thickness stiffness. Therefore, each leaf spring 60U, 60L is deformed in preference to the thickness direction (vibration direction) rather than the lateral direction. Moreover, the magnet assembly 30 and the coil holding | maintenance part 50 are being fixed to a pair of leaf | plate springs 60U and 60L in the both sides of those thickness directions, respectively. Therefore, the magnet assembly 30 and the coil holding part 50 vibrate together with the leaf springs 60U and 60L.

For this reason, the magnet assembly 30 and the coil holding portion 50 are linearly moved (rolling) and rotated (rolling) about the direction substantially orthogonal to the thickness direction of the leaf springs 60U and 60L. They are blocked and their vibration axes are regulated in a certain direction (longitudinal direction). Further, as described above, the coil 40 is disposed so as not to contact the magnet assembly 30 (the first magnet 31, the yoke 33, and the back yoke 32).

Therefore, when the power generation unit 10 vibrates, the magnet assembly 30 and the coil 40 are prevented from contacting each other. In particular, since both the magnet assembly 30 and the coil holding part 50 are rigid bodies having high rigidity, the direction substantially perpendicular to the vibration direction is the same as the spring parts 64 and 65 of the leaf springs 60U and 60L. High rigidity (lateral rigidity). Therefore, even when the power generation unit 10 vibrates, the magnet assembly 30 and the coil 40 are reliably prevented from contacting each other.

Thus, vibration energy from the vibrating body is efficiently transmitted to the first vibration system, and the vibration energy transmitted to the first vibration system is further efficiently transmitted to the second vibration system. As a result, the relative movement between the magnet assembly 30 and the coil 40 is ensured. As shown in FIG. 4, the power generation unit 10 flows from the center side of the first magnet 31 toward the outside via the yoke 33, and toward the center side of the first magnet 31 via the back yoke 32. A flowing magnetic field loop is formed.

Therefore, the relative movement between the magnet assembly 30 and the coil 40 moves the position of the first magnet 31 passing through the coil 40 of the magnetic field (magnetic field loop) having the magnetic flux density B generated. At this time, an electromotive force is generated based on the Lorentz force received by the electrons in the coil 40 through which the magnetic field passes. Since the electromotive force directly contributes to the power generation of the power generation unit 10, the power generation unit 10 can efficiently generate power.

In the power generation unit 10, the distance between the first spring portion 64 of the upper leaf spring 60 </ b> U and the first spring portion 64 of the lower leaf spring 60 </ b> L is the same as that of the cylindrical portion 22 side of the housing 20 and the coil holding portion. It may be set to be approximately equal or different on the 50 side. Further, the separation distance between the second spring portion 65 of the upper leaf spring 60U and the second spring portion 65 of the lower leaf spring 60L is between the coil holding portion 50 side and the magnet assembly 30 side (spacer 70 side). It may be set to be approximately equal or different.

By setting the separation distances differently, pretension (initial load) can be applied to the first spring part 64 and the second spring part 65 in a state where the power generation part 10 is not vibrating. In such a configuration, the posture of the power generation unit 10 changes between when the power generation device 100 is placed horizontally (the state shown in FIG. 10A) and when it is placed vertically (the state shown in FIG. 10B). Can be suppressed. Therefore, the power generation apparatus 100 can generate power efficiently regardless of the installation location.

In the apparatus body 1 as described above, the suction means 9 is provided on the lower surface of the base (support plate) 23 (the surface opposite to the power generation unit 10). By adsorbing the adsorbing means 9 to a vibrating body made of a magnetic material, the apparatus main body 1 (power generation apparatus 100) can be fixed to the vibrating body.

<< Adsorption means 9 >>
As shown in FIGS. 6 and 7, the attracting means 9 includes a plurality (seven in this embodiment) of magnet assemblies 91, a first sheet material 92 that holds the magnet assemblies 91, and a magnet assembly. 91 of the apparatus main body 1 and the 2nd sheet | seat material 93 provided in the opposite side.

Each magnet assembly 91 has a magnet block (second magnet 910 or third magnet 911 described later) formed of a permanent magnet having an annular shape and a bottomed cylindrical shape, and penetrates through the bottom (ceiling). And a yoke 912 made of a magnetic material in which holes are formed. The magnet block is fixed inside the yoke 912 by, for example, adsorption by the magnetic force of the magnet block itself, adhesion by an adhesive, or the like. In the magnet assembly 91 having such a yoke 912, the attractive force of the magnet block can be increased.

In the present embodiment, among the seven magnet assemblies 91, the permanent magnet assembly 91 (the magnet assembly 91 held by the fixing portion 921 of the first sheet material 92 described later) located in the center in FIG. The magnet constitutes a second magnet 910 that exerts a repulsive force on the first magnet 31.

As shown in FIG. 4, the second magnet 910 is arranged with the north pole on the upper side and the south pole on the lower side. Therefore, the first magnet 31 and the second magnet 910 are arranged so that the same poles (N poles) face each other. For this reason, a repulsive force due to magnetic interaction acts between the first magnet 31 and the second magnet 910.

Here, the magnetic interaction between the first magnet 31, the second magnet 910, and the vibrating body in a state where the power generation apparatus 100 is fixed to the vibrating body (duct 200) will be described with reference to FIG.

As shown in FIG. 8, an attractive force due to magnetic interaction acts between the first magnet 31 and the duct 200. On the other hand, a repulsive force due to magnetic interaction acts between the first magnet 31 and the second magnet 910. In the power generation device 100, the second magnet 910 that exerts a repulsive force on the first magnet 31 is disposed on the duct 200 side of the first magnet 31, so that the attractive force between the first magnet 31 and the duct 200 is obtained. And the repulsive force between the first magnet 31 and the second magnet 910 can be offset. For this reason, when the power generation device 100 is fixed to the duct 200 in a stationary state, the first magnet 31 is held at or near the position of the first magnet 31 in a natural state where no external force is applied to the power generation unit 10. . In other words, it is possible to prevent the position of the first magnet 31 relative to the housing 20 (coil 40) from being displaced before and after fixing the power generation apparatus 100 to the stationary duct 200. In such a power generator 100, the vibration of the duct 200 causes the first magnet 31 to move to its standard position (the position of the first magnet 31 in a natural state where no external force is applied to the power generator 10, in other words, the assembly of the power generator 100. The position of the first magnet 31 with respect to the housing 20 at the time) or the vicinity thereof can be displaced relative to the coil 40. As a result, the power generation apparatus 100 can reliably generate the design characteristics (power generation amount and frequency characteristics) and efficiently generate power.

The position of the first magnet 31 relative to the casing 20 in a natural state where no external force is applied to the power generation unit 10 and the power generation device 100 are fixed to the duct 200 in a stationary state, and the second magnet 910 fixes the first magnet 31 to the first magnet 31. The amount of deviation along the magnetization direction with respect to the position of the first magnet 31 with respect to the housing 20 in a state where the repulsive force is applied is preferably small. However, specifically, the amount of deviation is preferably about 0 to 5 mm, and more preferably about 0 to 2 mm. By satisfying the above conditions, in the power generation device 100, the first magnet 31 can be displaced relative to the coil 40 with the standard position as a reference by the vibration of the duct 200. As a result, the power generation apparatus 100 can reliably generate the design characteristics and generate power more efficiently.

As shown in FIG. 4, in this embodiment, the second magnet 910 is provided along the magnetization direction of the first magnet 31 (vertical direction in FIG. 4). In such a configuration, since the overlapping area of the first magnet 31 and the second magnet 910 in plan view is large, the magnitude of the repulsive force acting between the first magnet 31 and the second magnet 910 is sufficiently large. Can be bigger. Thereby, the attractive force between the first magnet 31 and the duct 200 and the repulsive force between the first magnet 31 and the second magnet 910 can be more reliably offset.

In the present embodiment, the central axis in the magnetization direction of the second magnet 910 is configured to overlap (coincide with) the central axis in the magnetization direction of the first magnet 31. As described above, when the central axes of the magnetization directions of the first magnet 31 and the second magnet 910 overlap each other, the repulsive force of the second magnet 910 with respect to the first magnet 31 is increased. It is possible to work in the thickness direction (vertical upward direction in FIG. 8). Thereby, when the electric power generating apparatus 100 is fixed to the duct 200 in a stationary state, the position of the first magnet 31 can be reliably maintained at the standard position. As a result, the power generation apparatus 100 can more reliably generate the characteristics (power generation amount and frequency characteristics) at the time of design by vibration of the duct 200 and more efficiently generate power.

Further, when the power generation apparatus 100 is fixed to the duct 200, the magnitude of the repulsive force of the second magnet 910 on the first magnet 31 is equal to the magnitude of the attractive force of the first magnet 31 on the duct 200. It is preferable. As a result, the attractive force between the first magnet 31 and the duct 200 and the repulsive force between the first magnet 31 and the second magnet 910 can be more reliably offset, and the first magnetic force can be obtained. The force acting on one magnet 31 can be canceled with certainty.

In addition, it is preferable that the magnitude of the repulsive force of the second magnet 910 with respect to the first magnet 31 is equal to the magnitude of the attractive force of the first magnet 31 with respect to the duct 200 as described above. More specifically, the magnitude of the repulsive force of the second magnet 910 with respect to the first magnet 31 is preferably about 30 to 50 mN, and more preferably about 36 to 44 mN. By satisfying the above conditions, the magnitude of the repulsive force of the second magnet 910 on the first magnet 31 and the magnitude of the attractive force of the first magnet 31 on the duct 200 become substantially equal, and the first is due to the magnetic interaction. The force acting on one magnet 31 can be canceled more reliably.

The separation distance between the first magnet 31 and the second magnet 910 (the distance between the lower surface of the first magnet 31 and the upper surface of the second magnet 910 in FIG. 4) is the first distance of the second magnet 910. If repulsive force with respect to the magnet 31 can be enlarged enough, it will not specifically limit. The separation distance between the first magnet 31 and the second magnet 910 can be appropriately adjusted depending on the constituent material and size of the second magnet 910 to be used. However, when a permanent magnet (magnet block) smaller in size than the first magnet 31 is used as the second magnet 910, the separation distance between the first magnet 31 and the second magnet 910 is 10 to It is preferably about 17 mm, more preferably about 11 to 15 mm.

As described above, in the power generation device 100 according to the present embodiment, the first magnet 31 and the second magnet 910 are disposed so that the same poles face each other, whereby the first magnet 31 and the vibrating body are arranged. And the repulsive force between the first magnet 31 and the second magnet 910 can be offset. On the other hand, in the power generation device 100 having such a configuration, when the first magnet 31 and the second magnet 910 are arranged so that the opposite poles face each other, specifically, in the power generation device 100 shown in FIG. When the first magnet 31 is arranged with the N pole on the upper side and the S pole on the lower side, the above-described effects of the present invention cannot be obtained.

Here, in the power generation device 100 of the present embodiment in which the first magnet 31 and the second magnet 910 are arranged so that the same poles face each other, and in the power generation device 100, the first magnet 31 and the second magnet 910 The force (attraction force, repulsive force) acting on the first magnet 31 in the power generation device in which the magnets 910 are arranged so that the opposite poles face each other will be described.

FIG. 9 shows the power generation device shown in FIGS. 1 to 4 and the power generation device in which the first magnet and the second magnet of the power generation device shown in FIGS. In the state, the analysis diagram analyzing the magnetic field generated between the magnet assembly of the power generation unit and the magnet assembly of the attracting means, and the separation distance between the first magnet and the second magnet and the first magnet It is a graph which shows the relationship with the magnitude | size of a working force.

Specifically, FIG. 9 (a-1) shows the magnet assembly 30 of the power generation unit 10 and the magnet assembly 91 of the attracting means 9 in a state where the power generation apparatus 100 shown in FIGS. It is the analysis figure which analyzed the magnetic field generated between. FIG. 9A-2 is a graph showing the relationship between the distance between the first magnet 31 and the second magnet 910 in the power generation apparatus 100 and the magnitude of the force acting on the first magnet 31. FIG. 9 (b-1) also shows that the power generation apparatus in which the first magnet 31 of the power generation apparatus shown in FIGS. 1 to 4 is arranged with the N pole on the upper side and the S pole on the lower side is fixed to the vibrating body. It is the analysis figure which analyzed the magnetic field which generate | occur | produces between the magnet assembly of an electric power generation part and the magnet assembly of an adsorption | suction means in a state. FIG. 9B-2 is a graph showing the relationship between the distance between the first magnet and the second magnet and the magnitude of the force acting on the first magnet in the power generation apparatus. In FIGS. 9A-2 and 9B-2, the magnitude (vertical axis) of the force acting on the first magnet 31 is positive (+) and negative (− )

As shown in FIG. 9 (a-1), in the power generation device 100, the density of magnetic lines of force (magnetic flux lines) between the first magnet 31 and the second magnet 910 is as shown in FIG. 9 (b-1) described later. It can be seen that it is lower than the power generator shown in FIG. In such a power generation device 100, even if the separation distance between the first magnet 31 and the second magnet 910 is set in a relatively wide range, the magnitude of the force acting on the first magnet 31 is small. In the power generation device 100, when these separation distances are set to 13 mm, the attractive force between the first magnet 31 and the vibrating body and the repulsive force between the first magnet 31 and the second magnet 910 are obtained. It can be canceled almost completely (see FIG. 9 (a-2)).

On the other hand, in the power generation device in which the first magnet and the second magnet are arranged so that the opposite poles face each other, as shown in FIG. 9 (b-1), the first magnet 31 and the second magnet 910 It can be seen that the density of the magnetic field lines (magnetic flux lines) between and is high. In such a power generation device, unless the separation distance between the first magnet 31 and the second magnet 910 is sufficiently increased, the magnitude of the force (attraction force) acting on the first magnet 31 cannot be reduced ( (See FIG. 9 (b-2)). For this reason, it is difficult for the power generation device having such a configuration to exhibit characteristics at the time of design (power generation amount, frequency characteristics) while reducing the size (lowering the height).

Such a second magnet 910 includes the apparatus main body 1 as a vibrating body together with the permanent magnets (third magnets 911) of the six magnet assemblies 91 other than the magnet assembly 91 located at the center in FIG. It further has a function of adsorbing. In the present embodiment, the same permanent magnet is used as the second magnet 910 and each third magnet 911.

As the constituent material of the second magnet 910 and the third magnet 911, for example, the same material as that of the first magnet 31 described above can be used. By using the second magnet 910 and the third magnet 911, the power generation device 100 can be fixed to the vibrating body with a sufficient attractive force (fixing force) regardless of the constituent material of the vibrating body. When the device 100 is detached from the vibrating body, the removing operation can be easily performed. That is, the power generator 100 can be easily and reliably detached from the vibrating body.

In the power generation device 100, the direction of the magnetic pole of the third magnet 911 is not particularly limited. That is, the third magnet 911 may be disposed with the N pole on the upper side or with the S pole on the upper side. In the power generation device 100, since the separation distance between the third magnet 911 and the first magnet 31 is sufficiently large, the attractive force or repulsive force acting due to the magnetic interaction between them becomes a magnitude that can be almost ignored. is there.

Further, as a constituent material of the yoke 912, a soft magnetic material having a high saturation magnetic flux density is preferable. In consideration of manufacturing the yoke 912 by press molding, the material is preferably a plate material obtained by plating a base material made of an iron-based material such as a galvanized steel plate, a tin-plated steel plate, or a nickel-plated steel plate. Used.

These magnet assemblies 91 are attached to the lower surface 230 of the base 23 via a first sheet material (attachment mechanism) 92. As shown in FIG. 6, the first sheet material 92 has a substantially circular fixing portion 921 fixed to the base 23 of the apparatus main body 1, and extends to the side of the fixing portion 921. And a plurality of integrally formed arm portions 922. The fixing portion 921 is fixed to the base 23 by, for example, adhesion using an adhesive.

A concave portion (holding portion) 923 that holds one magnet assembly 91 including the second magnet 910 is formed in the central portion of the fixing portion 921. In addition, a concave portion (holding portion) 923 that holds the magnet assembly 91 including the third magnet 911 is formed at the end portion of each arm portion 922 opposite to the fixing portion 921. The magnet assembly 91 is accommodated in the recess 923 and is fixed to the fixing portion 921 or the arm portion 922 by, for example, bonding with an adhesive. In the assembled state, the magnet assembly 91 (the magnet assembly 91 including the second magnet 910) held in the concave portion 923 of the fixing portion 921 is located in the concave portion 235 of the base 23.

The first sheet material 92 has flexibility. Thereby, the magnet assembly 91 (the second magnet 910 and the third magnet 911) held in the recess 923 of the arm portion 922 can be displaced with respect to the thickness direction of the base 23. In addition, as shown in FIG. 2, each arm portion 922 has a length such that the recess 923 (magnet assembly 91) is positioned outside the device body 1 when the power generation device 100 is placed on a flat surface. is doing.

Thereby, without reducing the tensile rigidity in the longitudinal direction (length direction) of each arm portion 922, the arm portions 922 approach each other, or in the twisting direction with the longitudinal direction of each arm portion 922 as the central axis. The rigidity of can be reduced. As a result, for example, the apparatus main body 1 can be stably fixed to a vibrating body having a curved surface (curved portion) such as the pipe 300 shown in FIG.

The arm portions 922 are provided at substantially equal intervals (approximately 60 ° intervals) along the circumferential direction of the fixed portion 921. That is, three magnet assemblies 91 (third magnets 911) are disposed at rotationally symmetric positions. Thereby, the apparatus main body 1 can be fixed to a vibrating body with uniform suction | attraction force along the circumferential direction. Further, it is possible to prevent the power generation apparatus 100 from moving in a specific direction due to vibration of the vibration body, that is, even when the vibration body vibrates, the power generation apparatus 100 can be held at a predetermined position of the vibration body. .

In particular, in the present embodiment, the arm portion 922 includes a plurality of first arm portions 922a and a plurality of second arm portions 922b that are shorter in length than the first arm portions 922a. Between the arm parts 922a, it arrange | positions so that the 2nd arm part 922b may be located. Thereby, the fixing force (holding force) of the apparatus main body 1 with respect to the vibrating body having a curved surface with a relatively small radius of curvature is improved by the first arm portion 922a, and the radius of curvature is compared by the second arm portion 922b. It is possible to improve the fixing force of the apparatus main body 1 to a vibrating body having a large curved surface or flat surface. That is, by configuring the arm portion 922 as described above, the device main body 1 (the power generation device 100) can be stably fixed to the vibrating body regardless of the shape and size of the vibrating body.

The length from the center of the fixing portion 921 to the tip of the first arm portion 922a is not particularly limited, but is preferably about 1.8 to 4 times the radius of the base 23, and preferably 2 to 3.5. More preferably, it is about double. On the other hand, the length from the center of the fixing portion 921 to the tip of the second arm portion 922b is not particularly limited, but is preferably about 1.2 to 2.5 times the radius of the base 23, and preferably 1.2 to More preferably, it is about 2 times.

The first sheet material 92 is preferably made of a material having sufficient flexibility and flexibility and high tensile strength. Examples of the material of the first sheet material 92 include a film such as a polyester film, a polyethylene film, a polypropylene film, and polyvinyl chloride, and a woven fabric produced by weaving fibers made of these polymer materials. Can be used.

The average thickness of the first sheet material 92 is not particularly limited, but is preferably about 0.01 to 1.0 mm, and more preferably about 0.03 to 0.1 mm. Since the first sheet material 92 having such a thickness is provided with excellent flexibility and flexibility regardless of the constituent material, it is possible to prevent the vibration from being inhibited when the vibrating body vibrates. . As a result, a decrease in power generation efficiency of the power generation apparatus 100 can be prevented or suppressed.

A second sheet material 93 having an outer shape substantially equal to the outer shape of the first sheet material 92 is fixed (laminated) to the lower surface of the first sheet material 92. Examples of a method for fixing the second sheet material 93 to the first sheet material 92 include fusion (thermal fusion, ultrasonic fusion, high frequency fusion), adhesion with an adhesive, and the like.

The second sheet material 93 has a function of preventing the apparatus main body 1 from slipping with respect to the vibration body when the apparatus main body 1 is fixed to the vibration body. When the suction unit 9 includes the second sheet material 93, even if the vibrating body vibrates violently, the apparatus main body 1 can be more reliably prevented from being displaced with respect to the vibrating body.

The second sheet material 93 is preferably made of a material having a high coefficient of friction and capable of absorbing minute irregularities present on the surface of the vibrating body. As the constituent material of the second sheet material 93, for example, an elastomer material (rubber material) having a hardness of about 10 to 100 is preferably used. Examples of such an elastomer material include, but are not limited to, butyl rubber, styrene butadiene rubber, nitrile rubber, acrylic rubber, silicone rubber, fluorine rubber, urethane rubber, and the like. Can be used in combination.

Among these, by using a low-hardness elastomer material, the second sheet material 93 exhibits high adhesiveness, and its friction coefficient is preferably set to 0.7 or more, more preferably 0.85 or more. be able to.

The average thickness of the second sheet material 93 is not particularly limited, but is preferably about 0.1 to 2.0 mm, and more preferably about 0.3 to 1.0 mm. The second sheet material 93 having such a thickness has excellent flexibility and bendability regardless of the constituent material thereof, and therefore the first sheet material 92 is fixed in a state where the second sheet material 93 is fixed. It is possible to prevent or suppress a decrease in flexibility (softness and flexibility).

The power generator 100 as described above is used by being fixed to a vibrating body made of a magnetic material such as the duct 200 shown in FIG. 10 or the pipe 300 shown in FIG.

The duct 200 shown in FIG. 10 has a rectangular tube shape including four deformable plate-like portions 201. The duct 200 is formed, for example, by bending and joining (welding) a plate material (steel plate or plated steel plate) made of a magnetic material. The duct 200 constitutes a flow path of a device that transfers (exhaust, ventilate, intake, circulate) a gas such as steam or air.

For example, air is passed through an air-conditioning duct 200 installed in a facility such as a large facility, building, or station by a blower or the like for the purpose of exhaust or ventilation in the facility. At this time, the duct 200 vibrates due to air pressure fluctuation (pulsation) of the blower or turbulence generated by the movement of air (fluid) in the duct 200. Moreover, the inside of the duct 200 is always positive pressure or negative pressure by the action of the blower. The vibration of the duct 200 due to the aforementioned pulsation or the like is applied to the pressure, and the plate-like portion 201 is deformed. Specifically, when the inside of the duct 200 is positive pressure, the plate-like portion 201 is deformed into a state of projecting toward the outside of the duct 200 (convex shape), as shown in FIG. On the other hand, when the inside of the duct 200 is negative pressure, the plate-like portion 201 is deformed into a state of projecting toward the inside of the duct 200 (concave shape) as shown in FIG. Due to the deformation of the plate-like portion 201, the vibration of the duct 200 is amplified.

According to the present invention, the magnet assembly 91 is attached to the apparatus main body 1 via the first sheet material 92 having flexibility. For this reason, even if unevenness exists on the surface of the plate-like portion 201 (the mounting surface of the power generation device 100), the first sheet material 92 is deformed following the unevenness to absorb the unevenness due to the unevenness. can do. Therefore, regardless of the surface shape of the plate-like portion 201, the suction means 9 can be reliably sucked to the plate-like portion 201. Furthermore, as described above, the plate-like portion 201 is deformed into a convex shape (see FIG. 11A) or the plate-like portion 201 is deformed into a concave shape (see FIG. 11B). The first sheet material 92 is deformed following the deformation of the plate-like portion 201. Therefore, the suction state of the suction means 9 with respect to the plate-like portion 201 is maintained, and the power generation device 100 can be reliably prevented from falling off the duct 200.

In the present embodiment, the lower surface 230 of the base 23 forms a curved convex surface having a convex portion at the center. For this reason, even if the plate-like portion 201 is in the state (concave shape) shown in FIG. 11B, the edge of the base 23 is difficult to contact the plate-like portion 201. Can be reliably prevented from falling off the duct 200.

Here, originally, the vibration of the duct 200 is unnecessary vibration that generates noise and unpleasant vibration in the facility. In the present invention, by adsorbing the adsorbing means 9 to the plate-like portion 201, the apparatus main body 1 is fixed to the duct 200, and unnecessary vibration of the duct 200 is used (regeneration) to generate electric power in the power generation unit 10 (power generation) ). Therefore, if it is a place where the duct 200 is installed, electric power can be obtained from the power generation apparatus 100 even if there is no power supply wiring.

Then, by combining this power generation device 100 with a sensor and a wireless device, for example, the following power generation system can be constructed. In such a power generation system, the illuminance, temperature, humidity, pressure, noise, and the like in the duct 200 and the facility can be measured by driving the sensor using the electric power obtained by the power generation apparatus 100. Further, by driving the wireless device using the power obtained by the power generation device 100, the detection data measured by the sensor is transmitted to the external terminal via the wireless device and used as various control signals and monitoring signals. can do.

In such a duct 200, as shown in FIG. 10 (a), the power generation device 100 may be fixed to a plate-like portion 201 constituting the top plate portion, and as shown in FIG. 10 (b), You may make it fix the electric power generating apparatus 100 to the plate-shaped part 201 which comprises the side wall part.

In this case, if the weight of the power generation device 100 is too large with respect to the mass of the plate-like portion 201 and the spring constant, the vibration of the plate-like portion 201 is suppressed and the plate-like portion 201 does not sufficiently vibrate. There is a possibility that the target power generation amount cannot be obtained from 100. Therefore, in the case of the duct 200 for air conditioning, the weight of the power generation apparatus 100 is preferably 200 to 800 g, and more preferably 400 to 600 g.

Therefore, when the weight of the power generation device 100 is 400 g, the attractive force with respect to the plate-like portion 201 of the attracting means 9 (the sum of the attractive forces with respect to the plate-like portion 201 of the magnet assembly 91) is larger than the weight of the power generation device 100. It is preferable to set the power generation device 100, specifically, it is preferable to set it to 600 g or more. Thereby, the power generation apparatus 100 can be stably fixed to any part of the plate-like portion 201 constituting the top plate portion. Can do.

When considering the vibration acceleration of the power generation apparatus 100 and external vibration generated by an earthquake or the like, if the vibration acceleration is 1 G and the acceleration due to the earthquake is 1 G, 3 G is added to the power generation apparatus 100 by adding the gravitational acceleration 1 G. Will join. Therefore, if the weight of the power generation device 100 is 400 g, it is preferable to set the suction force of the suction means 9 to the plate-like portion 201 to 1200 g or more. Accordingly, the power generation device 100 can be stably fixed also to the plate-like portion 201 that forms the side wall portion of the duct 200 illustrated in FIG. Moreover, if the suction force with respect to the plate-shaped part 201 of the adsorption | suction means 9 is about 1200g, the removal operation from the duct 200 of the generator 100 by an operator can also be performed easily.

The attractive force of the attracting means 9 to the plate-like portion 201 is, for example, the types (constituent materials) of the second magnet 910 and the third magnet 911, the number of the third magnets 911, and the constituent material of the yoke 912. It is possible to make adjustments by appropriately selecting etc.

On the other hand, the pipe 300 shown in FIG. 12 is formed by, for example, bending (joining) a plate material (steel plate or plated steel plate) made of a magnetic material into a tubular shape. That is, the pipe 300 includes a curved portion (curved surface) over the entire outer periphery thereof. The pipe 300 constitutes a flow path of a device that transfers fuel (fluid) such as hydrogen fuel gas and fuel oil.

For example, fuel oil is passed through a fuel supply pipe 300 installed in a facility such as a large plant by a pump or the like. At this time, the pipe 300 vibrates due to the hydraulic pressure fluctuation (pulsation) of the pump. According to the present invention, the magnet assembly 91 is attached to the apparatus main body 1 via the first sheet material 92 having flexibility. For this reason, the electric power generating apparatus 100 can be fixed also to a vibrating body having a curved surface (curved portion) like the pipe 300 shown in FIG.

Further, as described above, in the present embodiment, since the first sheet material 92 includes two types of arm portions 922a and 922b having different lengths, the pipe 300 of a type having a different curvature radius in the cross-sectional shape is used. In addition, the power generation apparatus 100 can be securely fixed.

In the power generation device 100 of the present embodiment described above, the second magnet 910 is provided along the magnetization direction of the first magnet 31, and the central axis in the magnetization direction of the second magnet 910 is The first magnet 31 is configured to overlap the central axis in the magnetization direction. However, the present invention is not limited to the above configuration. For example, even when the second magnet is not arranged along the magnetization direction of the first magnet, the type and size of the second magnet are changed, and the repulsive force of the second magnet on the first magnet is reduced. By adjusting so as to be sufficiently large, the same operation and effect as the power generation apparatus 100 of the present embodiment described above are produced.

Further, in the power generation device 100 of the present embodiment described above, the attracting means 9 has one magnet assembly 91 including the second magnet 910, but the present invention is not limited to this. For example, an attracting means having two or more magnet assemblies including a second magnet is prepared near the center of the fixed portion, and the shape and size of the concave portion of the base are changed. Next, as described above, by designing the magnet assembly provided in the fixing portion of the attracting means so as to be positioned in the recess of the base, the same operation and effect as the power generation device of the present embodiment described above can be obtained. It is possible to obtain a power generation device having the same.

Second Embodiment
Next, 2nd Embodiment of the electric power generating apparatus of this invention is described.

FIG. 13 is a longitudinal sectional view of a second embodiment of the power generator of the present invention. In the following description, the upper side in FIG. 12 is referred to as “upper” or “upper”, and the lower side is referred to as “lower” or “lower”.

Hereinafter, the power generation device of the second embodiment will be described with a focus on differences from the power generation device of the first embodiment, and description of similar matters will be omitted. The power generation apparatus 100 according to the second embodiment does not have the adsorbing means 9, the apparatus main body 1 is directly fixed to the vibrating body, and the magnet includes the magnet assembly 91 described above on the upper side of the apparatus main body 1. Except having the containing sheet 900, it is the same as that of the electric power generating apparatus 100 of the said 1st Embodiment. That is, the power generation apparatus 100 of the present embodiment has a configuration including the apparatus main body 1 and the magnet-containing sheet 900 similar to those of the first embodiment described above.

Such a power generator 100 is used, for example, by being fixed to the lower plate-like portion 201 (bottom plate portion) of the vibrating body (duct 200) shown in FIG. That is, the power generation device 100 of the present embodiment is used in a state where the power generation device 100 of the first embodiment shown in FIG. 10 is rotated 180 degrees.

In the power generation device 100 (device main body 1) of the present embodiment, the base 23 has a rectangular flat plate shape. Through holes (not shown) are formed in the four corners of the base 23, respectively. A screw (not shown) is passed through the through hole of the base 23 and screwed into a screw hole provided in the vibrating body. Thereby, the base 23 and the vibrating body are fixed, and the power generation apparatus 100 is fixed to the vibrating body.

Further, as shown in FIG. 13, a magnet-containing sheet 900 is provided on the upper surface of the cover 21 (device main body 1).

The magnet-containing sheet 900 includes one magnet assembly 91 described above, a first sheet material 901 that holds the magnet assembly 91, and a second sheet material 902 provided on the apparatus main body 1 side of the magnet assembly 91. And. Such a magnet-containing sheet 900 is fixed to the cover 21 such that the central axis in the magnetization direction of the second magnet 910 of the magnet assembly 91 overlaps the central axis in the magnetization direction of the first magnet 31. .

As shown in FIG. 13, in this embodiment, the second magnet 910 of the magnet assembly 91 is arranged with the north pole on the upper side and the south pole on the lower side. Therefore, the first magnet 31 and the second magnet 910 are arranged so that the same poles (S poles) face each other. For this reason, a repulsive force due to magnetic interaction acts between the first magnet 31 and the second magnet 910.

The power generation device 100 of the present embodiment is used in a state where the cover 21 is located below the base 23 (vertically below). In the power generator configured only by the apparatus main body 1, when the weight of the magnet assembly 30 is larger than the attractive force of the first magnet 31 to the vibrating body, the first magnet 31 is displaced toward the cover 21. . On the other hand, in the power generation apparatus 100 according to the present embodiment having the apparatus main body 1 and the magnet-containing sheet 900, the repulsive force acts between the first magnet 31 and the second magnet 910, whereby the first magnet It is possible to prevent the position of 31 relative to the housing 20 (coil 40) from being displaced. In the power generation apparatus 100, the first magnet 31 can be displaced relative to the coil 40 with reference to the standard position by the vibration of the vibrating body. As a result, the power generation device 100 can reliably generate the design characteristics and efficiently generate power.

The first sheet material 901 is a rectangular sheet, and a recess (holding portion) that holds the magnet assembly 91 is formed. Such a first sheet material 901 is the same as the first sheet material 92 described above except that the number of recesses and the outer shape thereof are different.

Further, the second sheet material 902 has an outer shape substantially equal to the outer shape of the first sheet material 901, and fixes (laminates) the magnet assembly 91 between the first sheet material 901 and the second sheet material 902. Examples of a method for fixing the second sheet material 902 to the first sheet material 901 include fusion (thermal fusion, ultrasonic fusion, high frequency fusion), adhesion with an adhesive, and the like. Such a second sheet material 902 is the same as the second sheet material 902 described above except that its outer shape is different. The magnet-containing sheet 900 can be attached (fixed) to the upper surface of the cover 21 by attaching the second sheet material 902 to the cover 21 by bonding with an adhesive or sticking with an adhesive.

Note that the power generation device 100 of the present embodiment is fixed to the vibrating body by screwing. Therefore, in addition to the duct 200 described above, the power generation apparatus 100 of the present embodiment can be applied to a vibrating body in which the surface on which the power generation apparatus 100 is attached is made of a material other than a magnetic material.

In the power generation apparatus 100 according to the embodiment described above, the power generation unit 10 is configured by an electromagnetic induction element using the first magnet 31 and the coil 40. However, the power generation unit 10 includes an electrostatic element (electret), a piezoelectric element. An element, a magnetostrictive element, or the like can also be used.

Moreover, although the duct 200 and the pipe 300 were mentioned as an example of a vibrating body, as a vibrating body, for example, a transport plane (a freight train, an automobile, a truck bed), a rail constituting a track, a highway or a tunnel wall surface, for example. Examples include panels, bridges, and rotating equipment equipped with motors such as pumps, fans, and turbines. The power generation apparatus 100 of the present invention can be configured by fixing the power generation device 100 to a portion formed of the magnetic material of these vibrators.

As mentioned above, although the electric power generating apparatus and electric power generation system of this invention were demonstrated based on embodiment of illustration, this invention is not limited to this. For example, each configuration can be replaced with an arbitrary configuration that can exhibit the same function, or an arbitrary configuration can be added.

For example, in the present invention, the arbitrary configurations of the first and second embodiments can be combined.

According to the present invention, by applying a repulsive force from the second magnet to the first magnet, the first magnet applies an external force to the power generation unit when the power generation device is fixed to the stationary vibration body. It is held at or near the position of the first magnet in the natural state. Therefore, the vibration of the vibrating body can displace the first magnet relative to the coil with reference to the standard position (the position of the first magnet in a natural state where no external force is applied to the power generation unit). . As a result, the power generation apparatus can reliably generate the design characteristics (power generation amount and frequency characteristics) and efficiently generate power. Therefore, the present invention has industrial applicability.

Claims (11)

1. A power generation device used by being fixed to a vibrating body,
   A first magnet, a coil spaced apart from the first magnet and surrounding the outer periphery thereof, and the first magnet relative to the coil along its magnetization direction. A power generation unit comprising a spring to be displaced to
   When the power generation device is fixed to the stationary vibration body, the first magnet is held at or near the position of the first magnet in a natural state where no external force is applied to the power generation unit. And a second magnet arranged to exert a repulsive force on the first magnet.
2. The power generation device according to claim 1, wherein the second magnet is provided along the magnetization direction of the first magnet.
3. Each of the first magnet and the second magnet has a block shape,
   The power generation device according to claim 2, wherein the second magnet is provided such that a central axis in the magnetization direction thereof overlaps with a central axis in the magnetization direction of the first magnet.
4. The vibrator is made of a magnetic material,
   The power generation device according to claim 1, wherein the power generation device is fixed to the vibrating body via the second magnet.
5. The power generation device according to claim 4, wherein a magnitude of repulsive force of the second magnet with respect to the first magnet is substantially equal to a magnitude of attractive force of the first magnet with respect to the vibrating body.
6. The power generation device according to claim 4 or 5, wherein the power generation device is configured such that an attractive force of the second magnet to the vibrating body is greater than a weight thereof.
7. The power generation device includes the second magnet, and has a suction unit that attaches the power generation device to the vibrating body,
   The adsorbing means is flexible and is provided between the sheet material holding the second magnet and the sheet material and the second magnet, and The power generator according to any one of claims 4 to 6, further comprising a yoke for fixing the magnet.
8. The attracting means further includes a plurality of third magnets,
   The sheet material has a plurality of fixing portions that are fixed to the power generation portion, and a holding portion that extends to the side of the fixing portion and holds the third magnet at an end opposite to the fixing portion. The power generation device according to claim 7, further comprising:
9. The power generation device according to claim 8, wherein when the power generation device is placed on a flat surface, each of the arm portions has a length such that the holding portion is positioned outside the device main body.
10. The power generation device according to any one of claims 1 to 3, wherein the second magnet is attached to a side of the power generation unit opposite to the vibration body when the power generation device is fixed to the vibration body.
11. A power generation device according to any one of claims 1 to 10,
    A power generation system comprising: a vibrating body made of a magnetic material for fixing the power generation device.

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