JP5417719B2 - Vibration type electromagnetic generator - Google Patents

Description

  The present invention relates to a vibration type electromagnetic power generator that generates power when, for example, at least one magnet magnetized in the length direction in a power generation coil composed of a plurality of solenoid coils vibrates.

  In recent years, portable electronic devices such as mobile phones and game machines have been widely used, and the amount of secondary batteries incorporated therein has been increasing. In addition, with the development of wireless technology, the application of RFID (Radio Frequency IDentification) that transmits and receives signals with minute power is expanding. In particular, an active RFID having a power source can communicate over several hundred meters. For this reason, it is expected to be applied to health management of cattle and horses in the ranch and safety management when children go to school.

  On the other hand, in order to maintain and improve the global environment, research and development of batteries with as little environmental impact as possible are being actively conducted. Among them, it is widely considered that energy that is normally unconsciously and wastefully consumed is converted into electric energy and charged, and this electric energy is used as a power source for a portable device or the like.

  Patent Document 1 discloses a vibration type electromagnetic generator that generates electric power by applying vibration from the outside. Here, with reference to FIG. 6, the structural example of the vibration type electromagnetic generator 100 is demonstrated.

  The vibration type electromagnetic generator 100 includes a pipe 102 made of a non-magnetic material and a rod-shaped movable magnet 101 magnetized in the length direction stored in the pipe 102. A solenoid coil 103 is formed at the center of the pipe 102. Magnets 104 a and 104 b are installed at both ends of the pipe 102 in such a state that the same polarity as that of the movable magnet 101 is opposed. For this reason, when the movable magnet 101 vibrates, the movable magnet 101 is prevented from contacting both ends of the pipe 192.

  Patent Document 2 discloses a flashlight including a vibration type electromagnetic generator that generates electric power by applying vibration from the outside and emits light using the obtained electric power. Here, with reference to FIG. 7, the structural example of the flashlight 110 is demonstrated.

  The flashlight 110 includes a pipe 112 made of a non-magnetic material and a rod-shaped movable magnet 111 that is magnetized in the length direction and is accommodated in the pipe 112. Compression springs 114 a and 114 b are provided at both ends of the pipe 112. The action of the compression springs 114a and 114b prevents the movable magnet 111 from coming into contact with both ends of the pipe 112. A solenoid coil 113 is formed at the center of the pipe 112. When the movable magnet 111 vibrates in the pipe 112, a voltage is generated in the solenoid coil 113, and the LED 115 emits light. The light emitted from the LED 115 is diffused by the lens 116 by this light emission, and is irradiated onto the object.

Patent Document 3 discloses a vibration generator 1 that generates a voltage by moving a movable magnet in which a plurality of permanent magnets are fastened by fastening members inside a case.
JP 2002-281727 A US Pat. No. 5,975,714 JP 2006-296144 A

  By the way, in the vibration type electromagnetic generator 100 described in Patent Document 1, two magnets disposed at both ends of the pipe are required in addition to the magnets that directly contribute to power generation. Generally, this type of electromagnetic generator is required to obtain a large amount of electric power while being as small as possible. For this reason, although the magnet of high magnetic flux density is required, the cost ratio of the magnet with respect to the manufacturing cost of an electromagnetic generator will become high. That is, the conventional vibration type electromagnetic generator 100 is disadvantageous in terms of cost. In addition, if a large number of magnets are used, the weight of the vibration type electromagnetic generator increases. For this reason, the user who shakes the vibration type electromagnetic generator is likely to get tired. As a result, it has been difficult to obtain a constant power generation amount for a long time.

  Further, the repulsive force by the magnet is not proportional to the moving distance of the movable magnet, unlike the repulsive force by the spring. And the movable magnet which vibrates with the repulsive force by a magnet shows the behavior different from the resonance vibration determined by the mass of a movable magnet and the spring constant of a coil spring. For this reason, the problem that the vibration of the movable magnet does not continue for a long time tends to occur. As a result, the repulsive force of the magnet cannot be converted into effective amplitude motion, and it is difficult to maintain the power generation amount.

  Further, when vibration is applied to the flashlight 110 described in Patent Document 2, the movable magnet 111 once leaves or collides with the coil spring. For this reason, the movable magnet and the coil spring cannot constitute a stable resonance system, and the power generation efficiency is poor. Moreover, since a collision sound is generated when the movable magnet and the coil spring collide, it is annoying for the user. Further, in this type of generator, the speed at which the movable magnet passes through the power generation coil contributes to the magnitude of power generation (output voltage). In order to obtain more power generation, intense vibrations must be applied, but the coil springs are easily damaged by the violent collision between the movable magnet and the coil springs.

  Moreover, in the technique described in patent documents 1-3, the contact area of the inner surface wall of a pipe (case) and the side peripheral surface of a movable magnet is large. For example, in Patent Document 3, since there is no step between the flange portion of the bolt, the side surface of the nut, and the side surface of the magnet attached to the bolt, these side surfaces contact the inner wall surface of the case. Due to this contact, a large frictional force is generated in the direction opposite to the direction in which the generator or the flashlight is shaken. This frictional force is not only an excellent sliding performance, but also attenuates the vibration of the movable magnet and deteriorates the power generation efficiency. Further, if the holes and the fastening members formed in the magnet and the nonmagnetic spacer are strictly managed, the assembly becomes difficult.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vibration type electromagnetic generator in which the slidability of the inner peripheral surface of a pipe and a movable magnet is improved.

The vibration type electromagnetic generator according to the present invention includes a pipe made of a non-magnetic material, one or more power generation coils wound around the pipe, a pipe disposed in the center, and a through hole formed in the center. A movable magnet including one or more magnets, and first and second sealing members for sealing the end of the pipe. The movable magnet includes a first magnet fixing portion having a core portion inserted into the through hole of the magnet, and a second magnet fixing portion fixed to the core portion. The first magnet fixing portion is The first collar portion having a width larger than the width of the magnet with respect to the central axis of the pipe, and the second magnet fixing portion has a second collar portion having a width larger than the width of the magnet with respect to the central axis of the pipe. An elastic member that vibrates the movable magnet is provided between the movable magnet and the first and / or second sealing member , and the first collar portion of the first magnet fixing portion has one circumference of the side circumferential surface. linear oscillating motion parallel to the groove of the movable magnet that is formed over.

According to the present invention, the first magnet fixing portion includes the first collar portion having a width larger than the width of the magnet with respect to the center axis of the pipe, and the second magnet fixing portion has the magnet with respect to the center axis of the pipe. A second collar portion having a width larger than the width is provided, and an elastic member for vibrating the movable magnet is provided between the movable magnet and the first and / or second sealing member , and the first magnet fixing portion has. the first flange portion, an oscillation type electromagnetic power generator that has linear oscillating motion parallel to the groove of the movable magnet over one lap side peripheral surface is formed is obtained. For this reason, the contact area between the inner peripheral surface of the pipe and the outer peripheral surface of the movable magnet becomes extremely small, and the frictional force becomes small. In addition, the elastic member disposed between the movable magnet and the first and / or second sealing member supports and vibrates the movable magnet, so that the amount of attenuation of the movable magnet is reduced and the power generation amount is reduced. There is an effect that it is easy to maintain.

  Hereinafter, a configuration example of the vibration type electromagnetic generator 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the following description, an arrow indicating the direction of gravity is shown in the figure. The gravity direction (arrow direction) may be described as “lower” and the opposite direction of gravity may be described as “upper”.

FIG. 1 is a cross-sectional view showing the structure of the vibration type electromagnetic generator 10.
A conductive wire is wound around the outer periphery of the pipe 19 formed of a nonmagnetic material (for example, plastic having excellent slidability), and the power generation coil 11 is formed. The power generation coil 11 includes four coils 11a to 11d. The directions of the windings of the coils 11a to 11d are normal, reverse, normal, and reverse, and the coils 11a to 11d are connected in series. Inside the pipe 19, the movable magnet 12 connected with a plurality of magnets 12a to 12c magnetized in the length direction is inserted. The coil spring 17 as an elastic member is always compressed with respect to the natural length of the coil spring 17 at all positions where the movable magnet 12 moves in the pipe 19. For this reason, the movable magnet 12 is supported by the coil spring 17 so as to vibrate in the winding axis direction of the power generation coil 11, and can move inside the pipe 19.

  Suitable materials for the pipe 19 include polyacetal-based materials and polytetrafluoroethylene-based materials known to have a low coefficient of friction. Moreover, aluminum etc. are mentioned with a metal.

The movable magnet 12 is configured by sandwiching and fixing ring-shaped magnets 12 a to 12 c having the same poles facing each other between a first magnet fixing portion 14 and a second magnet fixing portion 15 made of a non-magnetic material.
The 1st magnet fixing | fixed part 14 is a volt | bolt, for example. The side surface of the collar part formed in the 1st magnet fixing | fixed part 14 is formed in a circle or polygonal shape. The 2nd magnet fixing | fixed part 15 is a nut, for example. The side surface of the second magnet fixing portion 15 is formed in a circular or polygonal shape and functions as a collar portion.

  The 1st magnet fixing | fixed part 14 has the core part 14a inserted in the magnets 12a-12c by which the through-hole was formed in the center part, the substantially frustoconical buffer part 14b, and the collar part 14c. The core part 14a, the buffer part 14b, and the collar part 14c are integrally formed. The core portion 14a is located on the central axis of the pipe 19, and is formed with a thickness that is approximately equal to or slightly smaller than the diameter of the through holes of the magnets 12a to 12c. A male screw (male part) for fixing the second magnet fixing part 15 is processed and formed on the upper side (tip part) of the core part 14a. A female screw (female part), which is a connection hole to which the tip of the core part 14c is connected, is processed and formed at the center of the second magnet fixing part 15. Then, the ring-shaped magnets 12a to 12c facing each other and repelling each other are sandwiched and fixed by the second magnet fixing portion 15 so as not to be detached from the core portion 14a.

  At this time, as another modified example having the same effect as the above-described male screw and female screw, for example, the core portion 14a of the first magnet fixing portion 14 has a tip-like shape, and the tip portion thereof has a hook shape. A configuration in which a hole (female part) is provided in the second magnet fixing part 15 to fit the flange-like part is used as a part (male part). When comprised in this way, a magnet can be fixed by fitting each other. For this reason, it has the advantage that an assembly of a movable magnet becomes easy compared with the structure of the above-mentioned male screw and female screw.

  The collar portion 14 c of the first magnet fixing portion 14 has a width larger than the width of the magnets 12 a to 12 c with respect to the central axis of the pipe 19. The collar portion of the second magnet fixing portion 15 has a width larger than the width of the magnets 12 a to 12 c with respect to the central axis of the pipe 19. At this time, it can be said that it is more desirable to make the shape and dimension of the collar part 14c of the 1st magnet fixing | fixed part 14 and the collar part of the 2nd magnet fixing | fixed part 15 the same. The maximum diameter of the collar portion 14 c of the first magnet fixing portion 14 and the collar portion of the second magnet fixing portion 15 is slightly larger than the inner diameter of the compression type coil spring 17 and slightly smaller than the inner diameter of the pipe 19. For this reason, the position of the coil spring 17 is automatically determined by the buffer portion 14b.

Suitable materials for the second magnet fixing portion 15 (nut) and the first magnet fixing portion 14 (bolt) include polyacetal materials for resins and aluminum for metals.
A polytetrafluoroethylene-based material may be used as the material of the second magnet fixing portion 15 (nut) and the first magnet fixing portion 14 (bolt). Since this material has a very low coefficient of friction, it is excellent in slidability of the movable magnet 12. However, when the first magnet fixing portion 14 is screwed to the second magnet fixing portion 15, the friction may not be maintained. For this reason, after fixing a magnet using the 1st magnet fixing | fixed part 14 and the 2nd magnet fixing | fixed part 15, the means which crushes the front-end | tip of the 1st magnet fixing | fixed part 14 (bolt), or 1st The tip of the core part 14a of the magnet fixing part 14 is a bowl-shaped part, and a hole is formed in the second magnet fixing part 15, so that the first magnet fixing part 14 and It is desirable to take measures to prevent the second magnet fixing portion 15 from loosening.

  The contact between the movable magnet 12 and the inner peripheral surface of the pipe 19 is only on the side peripheral surface of the collar portion 14 c and the second magnet fixing portion 15. For this reason, there is an advantage that the friction between the movable magnet 12 and the pipe 19 is reduced, and the slidability of the movable magnet 12 is improved.

  By the way, there are a case where a tension spring is used as a coil spring and a case where a compression spring is used as a specification that constitutes a resonance system by a coil spring and a movable magnet. Furthermore, there are a case where one or two tension springs are used and a case where one or two compression springs are used.

  When a tension spring is used, the tension spring and the movable magnet 12 and the tension spring and the pipe 19 must be coupled. For example, in order to fix the tension spring to the movable magnet 12 or the pipe 19, it is necessary to form a hook on the tension spring. Furthermore, it is necessary to form pores or hooks for hooking the hooks of the tension springs on the movable magnet 12 and the sealing member of the pipe 19.

  On the other hand, when a compression spring is used, the length of the compression spring is designed so that a compression force is always obtained from the compression spring when the movable magnet 12 moves in the pipe 19. In this case, the compression spring and the movable magnet 12, the hooks that connect the compression spring and the pipe 19, pores, and the like do not need to be specially formed. For this reason, there exists an advantage that the process and components for forming a hook, a pore, etc. can be reduced.

  One end of the pipe 19 is sealed with a second sealing member 16b. A coil spring 17 is attached to the second sealing member 16b. A frustoconical protrusion is formed on the second sealing member 16b, similarly to the buffer portion 14b. The diameter of the bottom of the truncated cone is set to be slightly smaller than the inner diameter of the coil spring 17. For this reason, the position of the coil spring 17 is automatically determined by the second sealing member 16b.

  Further, the sum of the height of the truncated cone of the buffer portion 14 b and the height of the truncated cone of the second sealing member 16 b is set slightly larger than the shortest length of the coil spring 17. For this reason, even if the movable magnet 12 moves to the lowermost side, it is possible to prevent an abnormal force from being applied to the coil spring 17 and to prevent the coil spring from being damaged.

  In the vibration type electromagnetic generator 10, the coil spring 17 still pushes the movable magnet 12 upward even when the movable magnet 12 moves to the uppermost side. For this reason, it is not necessary to couple | bond the coil spring 17 and the movable magnet 12, and the coil spring 17 and the 2nd sealing member 16b, respectively.

  The vibration type electromagnetic generator 10 is assembled by inserting the coil spring 17 and the movable magnet 12 in this order into the pipe 11 sealed by the second sealing member 16b, and finally the pipe by the first sealing member 16a. This is done by sealing 19. Since the assembly of the vibration type electromagnetic generator 10 is completed only through this assembly process, the assembly is extremely easy.

FIG. 2 is an external perspective view of the first magnet fixing portion 14.
The buffer part 14b is substantially frustoconical. Further, a groove parallel to the linear amplitude motion is formed over the circumference of the second magnet fixing portion 15 and the side peripheral surface of the first magnet fixing portion 14 excluding the core portion 14a. Due to the presence of this groove, the operator can assemble the movable magnet 12 in the step (particularly, the step of inserting the magnets 12a to 12c into the second magnet fixing portion and tightening the second magnet fixing portion 15). The first magnet fixing portion 14 and the second magnet fixing portion 15 are fastened without slipping. For this reason, the assembly of the movable magnet 12 becomes easy.

  Furthermore, the contact area between the movable magnet 12 and the inner peripheral surface of the pipe 19 is limited to the side surfaces of the first magnet fixing portion 14 and the collar portion 14c. For this reason, the configuration in which the groove parallel to the linear amplitude motion is formed over the entire circumference of the side circumferential surface as in this embodiment has a smaller contact area with the inner circumferential surface of the pipe 19. As a result, the movable magnet 12 having excellent slidability is obtained. Further, even when the shapes of the second magnet fixing portion 15 and the collar portion 14c are polygonal, assembling is facilitated by forming innumerable grooves on the side peripheral surfaces thereof. The above-described groove is particularly effective in assembling the movable magnet 12, and therefore is not an indispensable configuration when only considering the purpose of improving the slidability of the movable magnet 12.

  The vibration type electromagnetic generator 10 according to the first embodiment described above can form a stable resonance system by supporting the movable magnet 12 with at least one compression type coil spring 17. The vibration type electromagnetic generator 10 is particularly suitable when the second sealing member 16b is used facing downward. Moreover, since the compressive force of the coil spring 17 always acts in the whole area | region where the movable magnet 12 moves in the pipe 19, the coil spring 17 and the movable magnet 12 do not leave | separate. For this reason, no special hook for coupling is required for either the coil spring 17 or the movable magnet 12. Accordingly, the length of the coil spring 17 and the movable magnet 12 can be shortened. Further, the moving range of the movable magnet 12 in the pipe 19 is widened. For this reason, there exists an advantage that electric power generation amount increases. In addition, the coil spring 17 and the movable magnet 12 and the coil spring 17 and the pipe 19 do not have to be coupled, so that processes and parts can be reduced, and assembly is facilitated.

  In the vibration-type electromagnetic generator 10 according to the first embodiment described above, the case where the frustoconical protrusions are formed on both the first magnet fixing portion 14 and the second sealing member 16b has been described. . However, a recess having a diameter slightly larger than the outer diameter of the coil spring 17 may be formed in either one of the first magnet fixing portion 14 and the second sealing member 16b as a substitute for the protrusion. Good. In this case, the coil spring 17 can be positioned by making the height of the other truncated cone slightly larger than the shortest length of the compression type coil spring 17. Even in this case, even if the movable magnet 12 moves to the lowest side, it is possible to prevent an abnormal force from being applied to the compression type coil spring 17.

  Further, the second magnet fixing portion 15 may be formed with a truncated cone-shaped protrusion similar to the first magnet fixing portion 14 and a compression type coil spring may be attached. Furthermore, it is also possible to form a similar frustoconical protrusion on the first sealing member 16a and attach a compression type coil spring.

  Next, a configuration example of the vibration type electromagnetic generator 20 according to the second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a cross-sectional view showing the structure of the vibration type electromagnetic generator 20.
A conductive wire is wound around the outer periphery of the pipe 29 formed of a non-magnetic material (for example, plastic having excellent slidability), and the power generation coil 21 is formed. The power generation coil 21 includes three coils 21a to 21c. The winding directions of the coils 21a to 21c are normal, reverse, and positive, and the coils 21a to 21c are connected in series. Inside the pipe 29, the movable magnet 22 connected with a plurality of magnets 22a to 22c magnetized in the length direction is inserted. The coil springs 27a and 27b as elastic members are always in a compressed state with respect to the natural length of the coil springs 27a and 27b at all positions where the movable magnet 22 moves in the pipe 29. For this reason, the movable magnet 22 is supported by the two coil springs 27 a and 27 b so as to vibrate in the winding axis direction of the power generation coil 21, and can move inside the pipe 29.

The movable magnet 22 is configured by sandwiching and fixing ring-shaped magnets 22 a to 22 c having the same poles facing each other between a first magnet fixing part 24 and a second magnet fixing part 25 made of a nonmagnetic material.
The 1st magnet fixing | fixed part 24 is a volt | bolt which has a through-hole in the longitudinal direction and the center part, for example. The side surface of the collar portion formed in the first magnet fixing portion 24 is formed in a circular or polygonal shape. The 2nd magnet fixing | fixed part 25 is a nut, for example. The side surface of the second magnet fixing portion 25 is formed in a circular or polygonal shape and functions as a collar portion.

  The first magnet fixing part 24 is formed with a core part 24a to be inserted into the magnets 22a to 22c having a through-hole formed in the center part, and a ring-shaped collar part 24c. The core part 24a and the collar part 24c are integrally formed. The core portion 24 a is formed in a pipe shape and is located on the central axis of the pipe 29. The central axis of the core part 24 a coincides with the central axis of the pipe 29. And the core part 24a is formed by the thickness substantially equal to the diameter of the through-hole of magnet 22a-22c. A male screw for fixing the second magnet fixing part 25 is processed on the upper side (tip part) of the core part 24a. A female screw, which is a connection hole to which the tip of the core part 24c is connected, is processed at the center of the second magnet fixing part 25. The ring-shaped magnets 22a to 22c facing each other and repelling each other are sandwiched and fixed by the second magnet fixing portion 25 so as not to be detached from the core portion 24a.

  The flange portion 24 c of the first magnet fixing portion 24 has a width larger than the width of the magnets 22 a to 22 c with respect to the central axis of the pipe 29. The collar portion of the second magnet fixing portion 25 has a width larger than the width of the magnets 22 a to 22 c with respect to the central axis of the pipe 29. At this time, it can be said that it is more desirable to make the shape and dimension of the collar part 24c of the first magnet fixing part 24 and the collar part of the second magnet fixing part 25 the same. The maximum diameter of the flange portion 24c of the first magnet fixing portion 24 and the flange portion of the second magnet fixing portion 25 is slightly larger than the inner diameter of the compression type coil springs 27a and 27b and slightly larger than the inner diameter of the pipe 29. small. For this reason, the positions of the coil springs 27a and 27b are automatically determined by the protrusion 24b described later.

  Contact between the movable magnet 22 and the inner peripheral surface of the pipe 29 is only on the collar portion 24 c and the side peripheral surface of the second magnet fixing portion 25. For this reason, there is an advantage that the friction between the movable magnet 22 and the pipe 29 is reduced, and the slidability of the movable magnet 22 is improved.

  Suitable materials for the pipe 29, the first magnet fixing portion 24, and the second magnet fixing portion 25 are the pipe 19, the first magnet fixing portion 14, and the second magnet according to the first embodiment. The same as the fixing portion 15.

  The core portion 24a is a hollow pipe having a through hole formed at the center. The inner diameter of the hollow pipe is larger than the outer diameter of the coil springs 27a and 27b. For this reason, the coil springs 27a and 27b can be inserted into the hollow pipe. The movable magnet 22 is slidably supported inside the pipe 29 by these two coil springs. The advantages of using compression springs as the coil springs 27a and 27b are as described above in the description of the first embodiment.

  The end of the pipe 29 is sealed with a first sealing member 26a and a second sealing member 26b. A coil spring 27b is attached to the first sealing member 26a and the second sealing member 26b. Furthermore, a frustoconical protrusion is formed on the first sealing member 26a and the second sealing member 26b. The diameter of the bottom of the truncated cone is set to be slightly smaller than the inner diameter of the coil spring 27b. For this reason, the position of the coil spring 27b is automatically determined by the second sealing member 26b.

  The hollow pipe formed in the core 24a has an inner diameter larger than the outer diameter of the coil springs 27a and 27b, and can be inserted without the coil springs 27a and 27b being in strong contact with the inner wall. Further, a projection 24b having a diameter smaller than the outer diameter of the coil springs 27a and 27b is formed at a substantially central portion inside the hollow pipe of the first magnet fixing portion 24. The protrusion 24b functions as a point of action of a force that transmits the repulsive force of the coil spring to the movable magnet as well as the function of limiting the elongation of the coil springs 27a and 27b.

  Furthermore, the height of the truncated cone of the first sealing member 26a may be shorter than the distance from the open end of the hollow pipe formed in the core portion 24a to the protruding portion 24b. Within that range, when the height of the truncated cone is as long as possible, even if the movable magnet 22 moves to the uppermost position, it is possible to prevent the coil spring 27a from being bent or applying an abnormal force. The same applies to the height of the truncated cone of the second sealing member 26b.

  In the vibration type electromagnetic power generator 20, the coil spring 27b still acts to push the movable magnet 22 upward even when the movable magnet 22 moves to the uppermost position. For this reason, it is not necessary to couple | bond each of the coil spring 27a and the movable magnet 22, and the coil spring 27a and the 1st sealing member 26a. Similarly, even when the movable magnet 22 moves to the lowest side, the coil spring 27a still acts to push the movable magnet 22 downward. For this reason, it is not necessary to couple | bond each of the coil spring 27b, the movable magnet 22, and the coil spring 27b and the 2nd sealing member 26b.

  The vibration type electromagnetic generator 20 is assembled by inserting the coil spring 27b, the movable magnet 22, and the coil spring 27a into the pipe 29 sealed by the second sealing member 26b in this order, and finally the first sealing member. This is done by sealing the pipe 29 with 26a. Since the assembly of the vibration type electromagnetic generator 20 is completed only through this assembly process, the assembly is extremely easy.

  Since the vibration type electromagnetic generator 20 according to the second embodiment described above includes the first magnet fixing portion 24 and the second magnet fixing portion 25, the first embodiment is described. As a matter of course, when the coil springs 27a and 27b are compressed, they are accommodated in a hollow pipe formed in the core portion 24a. Further, the moving range of the movable magnet 22 that moves in the pipe 29 is not limited by the lengths of the coil springs 27a and 27b. And the length of the vibration type electromagnetic generator 20 main body can be shortened by shortening the length of the pipe 29. Further, the vibration type electromagnetic generator 20 has an effect that power can be generated in an arbitrary direction regardless of the direction of gravity.

  The coil springs 27a and 27b inserted into the pipe 29 are always in a compressed state with respect to the natural length of the coil spring 22 at all positions where the movable magnet 22 moves. In addition, a convex protrusion or a concave depression for limiting the radial position of the coil spring is formed in at least one of the first magnet fixing portion 26a and the second magnet fixing portion 26b. For this reason, the elastic force is not easily attenuated without the coil springs 27a and 27b being bent. As a result, there is an effect that power can be generated efficiently.

Note that the vibration type electromagnetic generator 20 may be provided with a buffer portion that functions as a stopper that limits the elongation of the coil springs 27a and 27b.
FIG. 4 is a cross-sectional view showing the structure of a vibration type electromagnetic generator 20 ′ in which a buffer portion is formed in the hollow pipe portion of the first magnet fixing portion 28 obtained by modifying the first magnet fixing portion 24. In the vibration type electromagnetic generator 20 ′, the same components as those of the vibration type electromagnetic generator 20 described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  The vibration type electromagnetic generator 20 ′ is characterized by having a core portion 28 a at the center of the first magnet fixing portion 28. Above and below the core portion 28a, substantially frustoconical buffer portions 28b and 28c are formed. The bottoms of the buffer portions 28b and 28c are slightly smaller than the inner diameters of the coil springs 27a and 27b. For this reason, the positions of the coil springs 27a and 27b are automatically determined by the buffer portions 28b and 28c. Further, the height when the truncated cone of the first sealing member 26a and the buffer portion 28b, and the truncated cone of the second sealing member 26b and the buffer portion 28c are added to each other is formed in the core portion 24a. The distance from the open end of the hollow pipe to the protrusion 24b is set shorter. For this reason, even if the movable magnet 22 moves to the uppermost lower end, an abnormal force is not applied to the coil spring.

  Next, a configuration example of the vibration type electromagnetic generator 30 according to the third embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a cross-sectional view showing the structure of the vibration type electromagnetic generator 30.
A conductive wire is wound around the outer periphery of the pipe 39 formed of a nonmagnetic material (for example, plastic having excellent slidability), and the power generation coil 31 is formed. The power generation coil 31 includes four coils 31a to 31d. The winding directions of the coils 31a to 31d are normal, reverse, normal, and reverse, and the coils 31a to 31d are connected in series. A movable magnet 32 to which a plurality of magnets 32 a to 32 c magnetized in the length direction are connected is inserted into the pipe 39. The coil springs 37a and 37b as elastic members are always compressed with respect to the natural length of the coil springs 37a and 37b at all positions where the movable magnet 32 moves in the pipe 39. For this reason, the movable magnet 32 is supported by the two coil springs 37 a and 37 b so as to be able to vibrate in the winding axis direction of the power generation coil 31, and can move inside the pipe 39.

The movable magnet 32 is configured by sandwiching and fixing ring-shaped magnets 32 a to 32 c having the same poles facing each other between a first magnet fixing portion 34 and a second magnet fixing portion 35 made of a non-magnetic material.
The 1st magnet fixing | fixed part 34 is a volt | bolt which has a through-hole in the longitudinal direction and the center part, for example. The side surface of the collar portion 34c formed on the first magnet fixing portion 34 is formed in a circle or a polygonal shape. The 2nd magnet fixing | fixed part 35 is a nut, for example. The side surface of the second magnet fixing portion 35 is formed in a circular or polygonal shape and functions as a collar portion.

  The first magnet fixing portion 34 is formed with a core portion 34a to be inserted into the magnets 32a to 32c having a through hole formed in the center portion, and a ring-shaped collar portion 34c. The core part 34a and the collar part 34c are integrally formed. The core portion 34 a is formed in a pipe shape and is located on the central axis of the pipe 39. The central axis of the core part 34 a coincides with the central axis of the pipe 39. And the core part 34a is formed by the thickness substantially equal to the diameter of the through-hole of the magnets 32a-32c. On the upper side (tip portion) of the core portion 34a, a male screw for fixing the second magnet fixing portion 35 is processed and formed. A female screw, which is a connection hole to which the tip of the core portion 34c is connected, is processed and formed at the center of the second magnet fixing portion 35. The ring-shaped magnets 32a to 32c facing each other and repelling each other are sandwiched and fixed by the second magnet fixing portion 35 so as not to be detached from the core portion 34a.

  The collar portion 34 c of the first magnet fixing portion 34 has a width larger than the width of the magnets 32 a to 32 c with respect to the central axis of the pipe 39. The collar portion of the second magnet fixing portion 35 has a width larger than the width of the magnets 32 a to 32 c with respect to the central axis of the pipe 39. At this time, it can be said that it is more desirable to make the shape and size of the collar portion 34c of the first magnet fixing portion 34 and the collar portion of the second magnet fixing portion 35 the same. The maximum diameter of the flange portion 34 c of the first magnet fixing portion 34 and the flange portion of the second magnet fixing portion 35 is slightly smaller than the inner diameter of the pipe 39. The diameter of the through hole formed in the core portion 34c of the first magnet fixing portion 34 is set slightly larger than the outer shape of the compression type coil springs 37a and 37b. For this reason, the positions of the coil springs 37a and 37b are automatically determined by the protrusion 34b described later.

  The contact between the movable magnet 32 and the inner peripheral surface of the pipe 39 is only the collar portion 34 c and the side peripheral surface of the second magnet fixing portion 35. For this reason, there is an advantage that the friction between the movable magnet 32 and the pipe 39 is reduced, and the slidability of the movable magnet 32 is improved.

  A material suitable for the pipe 39, the first magnet fixing portion 34, and the second magnet fixing portion 35 is the pipe 19, the first magnet fixing portion 14, and the second magnet according to the first embodiment. The same as the fixing portion 15.

  The core part 34a is a hollow pipe having a through hole formed in the center. The hollow pipe has a diameter larger than the outer diameter of the coil springs 37a and 37b. For this reason, coil springs 37a and 37b can be inserted into the hollow pipe. The movable magnet 32 is slidably supported inside the pipe 39 by these two coil springs. The advantages of using compression springs as the coil springs 37a and 37b are as described above in the description of the first embodiment.

  Both ends of the pipe 39 are sealed with a first sealing member 36a and a second sealing member 36b. A coil spring 37a is attached to the first sealing member 36a. A coil spring 37b is attached to the second sealing member 36b.

  The inner diameter of the hollow pipe of the first magnet fixing portion 34 is larger than the outer diameter of the coil springs 37a and 37b, and can be inserted without the coil spring 37 being in strong contact with the inner wall. Further, a protrusion 34b having a diameter smaller than the outer diameter of the coil springs 37a and 37b is formed at a substantially central portion inside the hollow pipe of the first magnet fixing portion 34. The protrusion 34b functions as a point of action of a force that transmits the repulsive force of the coil spring to the movable magnet as well as the function of limiting the extension of the coil springs 37a and 37b.

  The length from the protruding portion 34b to the upper end of the first magnet fixing portion 34 is set to be larger than the shortest length of the coil spring 37a. For this reason, even if the movable magnet 32 moves to the uppermost part, it is possible to prevent an abnormal force from being applied to the coil spring 37a and to prevent the coil spring 37a from being damaged. Similarly, the length from the protruding portion 34b to the lower end of the first magnet fixing portion 34 is set to be larger than the shortest length of the coil spring 37b. For this reason, even if the movable magnet 32 moves to the lowermost side, an abnormal force can be prevented from being applied to the coil spring 37b, and the coil spring 37b can be prevented from being damaged.

  At the center of the pipe 39, a sliding shaft 33 having a diameter smaller than the diameter of the protrusion 34b is attached. Both end portions of the sliding shaft 33 are fixed to the center portions of the first sealing member 36a and the second sealing member 36b. The sliding shaft 33 passes through the centers of the coil springs 37a and 37b and fulfills the guide function of the coil springs 37a and 37b. For this reason, distortion of the coil springs 37a and 37b can be suppressed when the movable magnet 32 is moved. The movable magnet 32 is slidably supported inside the pipe 39 by the coil springs 37a and 37b. For this reason, the movable magnet 32 can be reliably reciprocated along the sliding shaft 33 with little effort by shaking the vibration type electromagnetic generator 30 from the outside.

  In the vibration type electromagnetic generator 30, the coil spring 37b still acts to push the movable magnet 32 upward even when the movable magnet 32 moves to the uppermost position. For this reason, it is not necessary to couple | bond each of the coil spring 37a and the movable magnet 32, and the coil spring 37a and the 1st sealing member 36a. Similarly, even when the movable magnet 32 moves to the lowest side, the coil spring 37a still acts to push the movable magnet 32 downward. For this reason, it is not necessary to couple | bond each of the coil spring 37b and the movable magnet 32, and the coil spring 37b and the 2nd sealing member 36b.

  The vibration type electromagnetic generator 30 is assembled by inserting the sliding shaft 33 into the center of the pipe 39 sealed by the second sealing member 36b, and then inserting the coil spring 37b, the movable magnet 32, and the coil spring 37a in order. Then, the pipe 39 is sealed with the first sealing member 36a. Since the assembly of the vibration type electromagnetic generator 30 is completed only through this assembly process, the assembly is extremely easy.

  Since the vibration type electromagnetic power generator 30 according to the third embodiment described above includes the first magnet fixing portion 34 and the second magnet fixing portion 35, the first and second magnet fixing portions 34 and 35 are configured. Of course, the same effects as those of the embodiment can be obtained, and when the coil springs 37a and 37b are compressed, they are accommodated inside the movable magnet 32 (in the hollow pipe). Further, the moving range of the movable magnet 32 that moves in the pipe 39 is not limited by the length of the coil springs 37a and 37b. And the length of the vibration type electromagnetic generator 30 main body can be shortened by shortening the length of the pipe 39. Moreover, the vibration type electromagnetic generator 30 has an effect that power generation is possible in an arbitrary direction regardless of the direction of gravity.

  The coil springs 37a and 37b inserted into the pipe 39 are always in a compressed state with respect to the natural length of the coil spring 32 at all positions where the movable magnet 32 moves. For this reason, the elastic force is not easily attenuated without the coil springs 37a and 37b being bent. As a result, there is an effect that power can be generated efficiently.

  Further, the vibration type electromagnetic generator 30 includes a sliding shaft 33. For this reason, when the moving distance of the movable magnet 32 is long, or when the coil springs 37a and 37b are thin and the coil springs 37a and 37b themselves cannot hold the shape, the coil springs 37a and 37b are bent and the hollow pipe of the movable magnet 32 There is an effect to prevent the problem that it is not stored in the storage.

  In the vibration type electromagnetic generators according to the first to third embodiments described above, a plurality of magnets magnetized in the length direction are made to face each other with the same polarity, and the second magnet fixing portion and the second magnet fixing portion A case has been described in which a movable magnet is formed by tightening and fixing with one magnet fixing portion. However, it is also possible to facilitate the assembly of the movable magnet by sandwiching a non-magnetic or magnetic spacer between the opposite surfaces of the same polarity.

  Further, if there is at least one coil spring and a magnet, it is possible to configure a vibration type electromagnetic generator. In the vibration type electromagnetic generators according to the second and third embodiments, the protrusion provided in the pipe-shaped second magnet fixing portion is smaller than the inner diameter of the pipe and slightly larger than the outer diameter of the coil spring. A concave portion having a diameter may be formed. It is also possible to improve the positioning accuracy of the coil spring by this protrusion.

  Further, in order to further improve the simplicity related to the assembly of the movable magnet, the inner diameter dimension of the through hole of the magnet may be increased by a predetermined value with respect to the outer diameter dimension of the core portion of the first magnet fixing portion. . In that case, by setting the radius dimension of the collar portion of the first and second magnet fixing portions to be larger than the predetermined value, for example, the plurality of magnets are shifted in different directions. However, it is possible to maintain the contact between the collar portion and the inner peripheral surface of the pipe without the magnet contacting the inner peripheral surface of the pipe.

It is sectional drawing which shows the structural example of the vibration type electromagnetic generator which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the structural example of the 1st and 2nd magnet fixing | fixed part which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structural example of the vibration type electromagnetic generator which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structural example of the other vibration type electromagnetic generator which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structural example of the vibration type electromagnetic generator which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the example of the conventional vibration type electromagnetic generator. It is a block diagram which shows the example of the conventional vibration type electromagnetic generator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vibration type electromagnetic generator, 11a-11d ... Coil, 12 ... Movable magnet, 12a-12c ... Magnet, 14 ... 1st magnet fixing | fixed part, 15 ... 2nd magnet fixing | fixed part, 16a ... 1st sealing Member, 16b ... second sealing member, 17 ... coil spring, 19 ... pipe, 20, 30 ... vibrating electromagnetic generator

Claims (3)

A pipe formed of a non-magnetic material;
One or more power generation coils wound around the pipe;
A movable magnet including one or more magnets disposed in the pipe and having a through hole formed in a central portion;
A vibration electromagnetic generator comprising: a first sealing member and a second sealing member for sealing an end of the pipe;
The movable magnet is
A first magnet fixing part having a core part inserted into the through hole of the magnet;
A second magnet fixing part fixed to the core part,
The first magnet fixing portion includes a first collar portion having a width larger than a width of the magnet with respect to a central axis of the pipe,
The second magnet fixing portion includes a second collar portion having a width larger than the width of the magnet with respect to the central axis of the pipe,
An elastic member that vibrates the movable magnet between the movable magnet and the first and / or second sealing member ;
Wherein the first of said first flange portion magnet fixing portion has, the oscillation type electromagnetic power generator which is characterized that you have linear oscillating motion parallel to the groove of the movable magnet over one lap side peripheral surface is formed . In the vibration type electromagnetic generator according to claim 1,
Since the core part of the first magnet fixing part and the second magnet fixing part have a male part and a female part, the first and second magnet fixing parts are engaged with each other. A vibration type electromagnetic generator characterized in that the magnet inserted into the core portion is sandwiched and fixed. In the vibration type electromagnetic generator according to claim 2,
A hollow pipe portion having an inner diameter larger than the outer diameter of the elastic member is formed at the center of the core portion of the first and second magnet fixing portions,
The hollow pipe portion is provided with a protrusion,
The vibration-type electromagnetic generator, wherein the elastic member is connected to a protrusion of the hollow pipe portion.

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