Piezoelectric power generating apparatus

A piezoelectric power generating apparatus comprises a frame body having an axis line, a moving member and a plurality of piezoelectric portions. The moving member is penetrated into the frame body. Each of the piezoelectric portions comprises a first end and a second end. Each of the first ends is fixed at the frame body and each of the second ends is fixed at the moving member. The moving member is moved back and forth along the axis line of the frame body.

FIELD OF THE INVENTION

The present invention is generally relating to a piezoelectric power generating apparatus, more particularly to a piezoelectric power generating apparatus that can drive a plurality of piezoelectric portions in the mean time.

BACKGROUND OF THE INVENTION

Referring toFIG. 1as disclosed in U.S. Pat. No. 7,239,066. A piezoelectric power generating apparatus400comprising a plurality of piezoelectric portions410, a driver420and a frame body430. Each of the piezoelectric portions comprises a fixing end411and a free end412, and each of the fixing ends is fixed at the frame body430. The driver420has a lobe421and rotatably drives the lobe421to poke the free end412of each of the piezoelectric portions410thereby enabling each of the piezoelectric portions to deform and generate output voltage. Owning to the oscillation frequency from each of the piezoelectric portions410poked by the lobe421is not the same, that means, the restoring time of each of the piezoelectric portions410after being poked by the lobe421is different. Therefore, when the driver420is in rotation, each of the piezoelectric portions410is not able to be effectively poked by the lobe421, and each of the piezoelectric portions410can not provide a stable and identical output voltage. Moreover, when the lobe421is actuated by the driver420, the poked direction of the lobe421is opposite compared with the restoring direction of each of the piezoelectric portions410, which results mechanical interference to lead destruction between the lobe421and the piezoelectric portions410.

SUMMARY

A primary object of the present invention is to provide a piezoelectric power generating apparatus comprises a frame body having an axis line, a moving member penetrated into the frame body and a plurality of piezoelectric portions having a first end and a second end. Each of the first ends is fixed at the frame body, each of the second ends is fixed at the moving member, and the moving member is actuated to move back and forth along the axis of the frame body. By means of the moving member to move back and forth in the frame body, the piezoelectric portions are actuated simultaneously to deform by the moving member to produce the same deformation, oscillation frequency and output voltage. Besides, with the same deformation of the piezoelectric portions, each of the piezoelectric portions is not capable of producing mechanical interference. Moreover, by increasing the quantities of the frame body and the piezoelectric portions to significantly raise the output power of the piezoelectric power generating apparatus.

A secondary object of the present invention is to provide a piezoelectric power generating apparatus, wherein the second end of each of the piezoelectric portions is formed into a tapered-shape that the quantity of each of the piezoelectric portions fixed at the moving member can be increased. Besides, the tapered-shape of the second ends may prevent stack and extruding from each of the second ends to avoid interference and assembling inconvenience of each of the piezoelectric portions.

DETAILED DESCRIPTION OF THE INVENTION

Referring toFIGS. 2,4and5, a piezoelectric power generating apparatus1in accordance with an embodiment of the present invention comprises a frame body10having an axis line13, a moving member20and a plurality of piezoelectric portions30, the moving member20is penetrated into the frame body10, each of the piezoelectric portions30comprises a first end31and a second end32, each of the first end31is fixed at the frame body10, each of the second ends32is fixed at the moving member20, and the moving member20is capable of being moved back and forth along the axis line13to actuate the piezoelectric portions30simultaneously to generate deformation.

Referring toFIGS. 2,4and5again, in this embodiment, the frame body10comprises an inner wall101and a slot101arecessed into the inner wall101. The moving member20comprises a rod21and at least one clamping device22having a combination hole221, and the rod21is penetrated through the combination hole221. Or, the rod21and the clamping device22are formed into one piece, and the clamping device22comprises an outer wall222and a annulus slot222arecessed into the outer wall222. The first end31of each of the piezoelectric portions30is fixed at the slot101aof the frame body10, and each of the second ends32is fixed at the annulus slot222aof the clamping device22. With reference toFIG. 3, each of the piezoelectric portions30comprises a metal layer33, a first protection layer34formed on each of the metal layers33, a piezoelectric layer35formed on each of the protection layer34and a second protection layer36formed on each of the piezoelectric layer35. With reference toFIGS. 2, and2A, in this embodiment, the second end32of each of the piezoelectric portions30is formed into a tapered-shape32a, and the quantity of each of the piezoelectric portions30fixed at the annulus slot222acan be increased via the tapered shape32aof the second end32. Besides, the tapered-shape32aof the second ends may prevent stack and extruding from each of the second end32to avoid interference and assembling inconvenience of each of the piezoelectric portions30when each of the second ends32is fixed at the annulus slot222a. In this embodiment, the clamping device22can be actuated by the rod21to move back and forth along the axis line13in the frame body10. Owing to the piezoelectric portions30are actuated simultaneously by the moving member20, each of the piezoelectric portions30possesses the same deformation and generates the same oscillation frequency and output voltage. Besides, with the same deformation of the piezoelectric portions30, the mechanical interference between each of the piezoelectric portions30can be effectively avoided.

Referring toFIG. 5, in this embodiment, the frame body10comprises at least one first spacing member11recessed into the slot101a, the first end31of each of the piezoelectric portions30is disposed on the first spacing member11, and the first spacing member11is utilized for height adjustment of each of the piezoelectric portions30. In this embodiment, the inner wall101further has a contact surface101b, and the first spacing member11is disposed between each of the piezoelectric portions30and the contact surface101b. The frame body10further has a plurality of through holes102and a plurality of fixing members12, the through holes102are in contact with the slot101a, each of the fixing members12is located at each of the through holes102, and one end of each of the fixing members12is contacted and compressed with the first end31of each of the piezoelectric portions30to enable the first end31of each of the piezoelectric portions30to be fixed in the slot101aof the frame body10. In this embodiment, the fixing member12can be a bolt, besides, the clamping device22of the moving member20comprises at least one second spacing member224disposed into the annulus slot, the second end32of each of the piezoelectric portions30is disposed on the second spacing member224, and the second spacing member224is utilized for height adjustment of each of the piezoelectric portions30. In this embodiment, the outer wall222comprises a touch surface222b, and the second spacing member224is disposed between each of the piezoelectric portions30and the touch surface222b. Furthermore, the clamping device22further comprises a plurality of penetrating holes223and a plurality of positioning members225, the penetrating holes223are in contact with the annulus slot222a, each of the positioning members225is located at each of the penetrating holes223, and one end of each of the positioning members225is contacted and compressed with the second end32of each of the piezoelectric portions30to enable the second end32of each of the piezoelectric portions30to be fixed in the annulus slot222aof the clamping device22. In this embodiment, each of the positioning members225can be a bolt.

Referring toFIG. 5again, the moving member20can be driven by a driving member (not shown in the drawings), when the moving member20is not actuated by the driving member, the piezoelectric portions30are coplanar. In this embodiment, the moving member20can be driven by the driving member to move back and forth along the axis line13in the frame body10, the moving member20is located at the axis line13of the frame body10, and the axis line13is a center line of the frame body10.

Referring toFIG. 6, the piezoelectric power generating apparatus1indicates that the moving member20is penetrated through a plurality of frame bodies10, the moving member20comprises the rod21and a plurality of clamping devices22, each of the first ends31is fixed at each of the frame bodies10and each of the second ends32is fixed at each of the clamping devices22. The piezoelectric power generating apparatus1further comprises a plurality of fixing portions14and a plurality of penetrating rods15, each of the fixing portions14is disposed between two adjacent frame bodies10, and each of the penetrating rods15is penetrated through each of the fixing portions14and the frame bodies10to fix the frame bodies10. By increasing the quantity of the frame bodies10and the piezoelectric portions30, the output power of the piezoelectric power generating apparatus1can be effectively raised, and enables the output voltage of the piezoelectric power generating apparatus1to possess variability. The piezoelectric portions30can be driven by the moving member20to enable the piezoelectric portions30to have the same deformation and oscillation frequency to prevent mechanical interference.

While this invention has been particularly illustrated and described in detail with respect to the preferred embodiments thereof, it will be clearly understood by those skilled in the art that is not limited to the specific features shown and described and various modified and changed in form and details may be made without departing from the spirit and scope of this invention.