Frequency-adjustable magnetic coupling piezoelectric energy collection device with elastic amplification structure

Abstract

The utility model discloses a frequency-adjustable magnetic coupling piezoelectric energy collecting device with an elastic amplification structure, which is a device for converting vibration energy into electric energy and consists of a spring support structure and a piezoelectric cantilever beam structure. The spring support structure comprises a base, a spring and a cross-shaped supporting frame, a setting hole is formed in the base, and a sliding groove is formed in the cross-shaped supporting frame. The piezoelectric cantilever beam structure is arranged in a 45-degree inclined mode and can slide on a sliding groove of the cross-shaped supporting frame, and a permanent magnet is arranged at the upper end of the piezoelectric cantilever beam. The piezoelectric energy collecting device can collect three-dimensional multi-direction vibration energy, external weak excitation can be amplified through the action of the spring, the output power of the energy collecting device is increased, adjustable and magnetic coupling nonlinear technologies are effectively combined, the working frequency band is widened, and the energy harvesting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to piezoelectric energy collection technical field, concretely is a kind of adjustable frequency magnetic coupling piezoelectric energy collection device with elastic amplification structure. BACKGROUND

[0002] With the rapid development of micro-electro-mechanical system (MEMS), wireless sensors have been widely popularized in various application scenarios. However, long-term and stable power supply has become a key challenge for the further development of wireless sensors. Currently, most wireless sensors rely on chemical batteries for power supply, but the battery life is limited. In harsh or special environments, it is not only difficult to replace or charge, but also increases the cost and maintenance difficulty. Considering that the power consumption of wireless sensors is usually in the range of micro-watts to milliwatts, self-powered technology has become a promising alternative solution.

[0003] Among many self-powered technologies, piezoelectric energy harvesting gradually becomes an ideal power supply solution for micro-power consumption sensing devices due to its simple structure, small size, high output voltage and high energy conversion efficiency. However, the vibration excitation in the external environment is usually small in amplitude, which leads to insufficient output power of traditional piezoelectric energy harvesting devices. Therefore, a structure is needed that can amplify the vibration amplitude of piezoelectric elements under small excitation to improve energy harvesting efficiency.

[0004] In addition, most existing piezoelectric energy harvesting devices can only respond to vibrations in a single direction. When the vibration in the environment has multiple directions or the direction of external excitation is unknown, these single-direction responding devices cannot work effectively. Vibration in the actual environment is often random and irregular, rather than fixed at a certain frequency, which poses a challenge to the working frequency band matching of traditional energy harvesting devices. How to realize flexible adjustment of working frequency to adapt to the external excitation frequency and improve energy conversion efficiency has always been a research difficulty and focus in this field. SUMMARY

[0005] In view of the deficiencies of the prior art that the traditional piezoelectric energy harvesting device has a single collection direction, the collection frequency is not adjustable, and the amplitude of external vibration excitation is small, the purpose of the utility model is to provide a kind of adjustable frequency magnetic coupling piezoelectric energy collection device with elastic amplification structure.

[0006] To achieve the above object, the utility model provides the following technical scheme: A tunable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure, including spring support structure, piezoelectric cantilever beam structure, the spring support structure includes base, spring, cross -shaped support frame, the upper surface of base is provided with annular groove, has four mounting holes outside, can pass through bolt nut fixed, the lower surface of cross -shaped support frame is provided with annular groove, has four in the inside cross -shaped distribution's sliding slot, the one end of spring is set in the annular groove of base, the other end is set in the annular groove of cross -shaped support frame, the piezoelectric cantilever beam structure includes 45 inclined lower clamp, copper base, piezoelectric ceramic, magnet upper clamp, permanent magnet, rectangular clamp, the 45 inclined lower clamp is set in the sliding slot of cross -shaped support frame, can pass through the screw hole bolt nut cooperation in the sliding slot and clamping, the upper end of 45 inclined lower clamp is provided with clamping groove, and the both sides of clamping groove are provided with clamping hole, the upper surface of copper base is pasted with piezoelectric ceramic through conductive glue, the lower end of magnet upper clamp is provided with clamping groove, and the both ends of clamping groove are provided with clamping hole, the rectangular clamp and magnet upper clamp upper end face can pass through the bolt nut cooperation of clamping hole and set permanent magnet in the clamp in the middle, the one end of copper base is set in the clamping groove of 45 inclined lower clamp, and the other end is set in the clamping groove of magnet upper clamp.

[0007] Preferably, the 45° inclined lower clamp can slide in the sliding slot of the cross-shaped support frame, and can be clamped and fixed by screw hole bolt nut cooperation. According to different external excitation, the installation position is adjusted to realize adjustable energy harvesting frequency.

[0008] Preferably, the clamping groove of the 45° inclined lower clamp can be clamped and fixed by bolt nut cooperation through the clamping hole, and the clamping groove of the magnet upper clamp can be clamped and fixed by bolt nut cooperation through the clamping hole.

[0009] Preferably, the piezoelectric cantilever beam structure has 4, which are centrally symmetrically distributed, and the N poles of the permanent magnets of the 4 piezoelectric cantilever beam structures face the inside and repel each other.

[0010] Preferably, the spring support structure can amplify the external slight excitation, increase the vibration of the piezoelectric cantilever beam structure, and improve the output power of the energy harvesting device.

[0011] Preferably, when the vibration excitation contains a vibration component perpendicular to the plane of the piezoelectric cantilever beam structure, the piezoelectric ceramic deforms, thereby converting the vibration energy generated by the environment into electrical energy through the piezoelectric effect.

[0012] Preferably, the piezoelectric cantilever beam structure is arranged at an inclination of 45°, and a single piezoelectric cantilever beam structure can collect vibration energy in two directions, thereby improving the efficiency of energy collection.

[0013] Preferably, when external excitation causes a pair of piezoelectric cantilever beam structures in one direction to vibrate, the permanent magnet above the cantilever beam causes a pair of piezoelectric cantilever beam structures in another direction to vibrate through magnetic coupling, so that all piezoelectric cantilever beam structures vibrate, thereby improving the efficiency of energy collection.

[0014] The utility model provides a kind of adjustable frequency magnetic coupling piezoelectric energy collection device with elastic amplification structure, with following beneficial effects:1.the piezoelectric energy collection device, external small excitation is amplified by spring support structure, effectively increase the vibration amplitude of piezoelectric cantilever beam, so as to improve the output power of energy collection device, so that it can still realize efficient energy conversion in low amplitude excitation environment.

[0015] 2.the piezoelectric energy collection device, piezoelectric cantilever beam structure is arranged at an inclination of 45°, so that single cantilever beam can simultaneously feel two directions of vibration excitation of outside, and therefore can collect vibration energy in two directions;Whole system is symmetrically distributed, so that piezoelectric energy collection device can keep force balance in static state, when external vibration excitation is generated, break the original balance state of piezoelectric energy collection device, generate vibration, ensure that device can respond to three-dimensional multidirectional vibration energy, adapt to complex and changeable environmental vibration.

[0016] 3.the piezoelectric energy collection device, when external excitation comes from one direction, permanent magnet configured above piezoelectric cantilever beam can cause piezoelectric cantilever beam structure in other direction to vibrate using magnetic coupling nonlinearity, broaden working frequency band, improve adaptability to different frequency vibration and energy capture efficiency.

[0017] 4.the piezoelectric energy collection device, piezoelectric cantilever beam structure can slide in the sliding slot of cross support frame, and fixed position by bolt and nut, realize flexible adjustment of frequency, so that device can adapt to different external excitation frequency, ensure that energy collection device always operates in optimal working state. ACCURACY

[0018] Figure 1 It is overall structure schematic diagram of the utility model.

[0019] Figure 2 It is schematic diagram of spring support structure.

[0020] Figure 3 It is schematic diagram of 45° inclination under clamp installed in the sliding slot of cross support frame.

[0021] Figure 4A schematic view of a piezoelectric cantilever structure.

[0022] In the figure: 1, spring support structure; 2, piezoelectric cantilever structure; 3, base; 4, spring; 5, cross-shaped support frame; 6, mounting hole; 7, 45° inclined lower clamp; 8, copper base; 9, piezoelectric ceramic; 10, upper magnet clamp; 11, permanent magnet; 12, rectangular clamp; 13, threaded hole; 14, clamping hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Please refer to Figures 1-4 The present application provides a technical solution: an adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure, comprising a spring support structure 1 and a piezoelectric cantilever structure 2. The spring support structure 1 comprises a base 3, a spring 4 and a cross-shaped support frame 5. The upper surface of the base 3 is provided with an annular groove, and the outside has four mounting holes 6 which can be fixed by bolts and nuts. The lower surface of the cross-shaped support frame 5 is provided with an annular groove, and the inside has four sliding grooves distributed in a cross shape. One end of the spring 4 is arranged in the annular groove of the base 3, and the other end is arranged in the annular groove of the cross-shaped support frame 5. The piezoelectric cantilever structure 2 comprises a 45° inclined lower clamp 7, a copper base 8, a piezoelectric ceramic 9, an upper magnet clamp 10, a permanent magnet 11 and a rectangular clamp 12. The 45° inclined lower clamp 7 is arranged in the sliding groove of the cross-shaped support frame 5 and can slide and clamp in the sliding groove through the cooperation of the threaded hole 13, bolts and nuts. The upper end of the 45° inclined lower clamp 7 is provided with a clamping groove, and the clamping groove is provided with clamping holes 14 on both sides. The piezoelectric ceramic 9 is pasted on the upper surface of the copper base 8 through conductive adhesive. The lower end of the upper magnet clamp 10 is provided with a clamping groove, and the clamping groove is provided with clamping holes 14 at both ends. The rectangular clamp 12 and the upper end face of the upper magnet clamp 10 can cooperate through the bolts and nuts of the clamping holes 14 to arrange the permanent magnet 11 in the middle of the clamp. One end of the copper base 8 is arranged in the clamping groove of the 45° inclined lower clamp 7, and the other end is arranged in the clamping groove of the upper magnet clamp 10.

[0025] The base 3 has four mounting holes 6 outside, and the piezoelectric energy harvesting device can be mounted on the equipment by screwing and nutting. The device can keep stable operation under vibration by fixing the mounting holes on the base. The 45° inclined lower clamp 7 can slide in the sliding slot of the cross-shaped support frame 5, and can be clamped and fixed by screwing and nutting through the threaded hole 13. The installation position can be adjusted according to different external excitation, and the energy harvesting frequency can be adjusted. The clamping groove of the 45° inclined lower clamp 7 can be clamped and fixed by screwing and nutting through the clamping hole 14, and the clamping groove of the upper magnet clamp 10 can be clamped and fixed by screwing and nutting through the clamping hole 14. There are four piezoelectric cantilever beam structures 2, which are centrally symmetrically distributed. The N poles of the permanent magnets 11 of the four piezoelectric cantilever beam structures 2 face the inside and repel each other. The spring support structure 1 can amplify the external small excitation, increase the vibration of the piezoelectric cantilever beam structure 2, and improve the output power of the energy harvesting device. When the vibration excitation contains a vibration component perpendicular to the plane of the piezoelectric cantilever beam structure 2, the piezoelectric ceramic 9 deforms, thereby converting the vibration energy generated by the environment into electrical energy through the piezoelectric effect. The piezoelectric cantilever beam structure 2 is arranged at an angle of 45°, and a single piezoelectric cantilever beam structure can collect vibration energy in two directions, thereby improving the energy harvesting efficiency. When the external excitation causes a pair of piezoelectric cantilever beam structures 2 in one direction to vibrate, the permanent magnet 11 above the cantilever beam causes a pair of piezoelectric cantilever beam structures 2 in the other direction to vibrate through magnetic coupling, thereby causing all piezoelectric cantilever beam structures 2 to vibrate, thereby improving the energy harvesting efficiency.

[0026] The working principle of the adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure is as follows: the piezoelectric energy harvesting device can collect vibration energy in three-dimensional multidirectional directions, the piezoelectric cantilever beam structure 2 is arranged in a 45° inclined manner, so that a single piezoelectric cantilever beam structure 2 can collect vibration energy in two directions; the device is composed of a spring support structure 1 and a piezoelectric cantilever beam structure 2, external excitation is amplified by the spring support and transmitted to the piezoelectric cantilever beam, the action of the spring can convert small external excitation into greater displacement and amplitude, improve the response of the piezoelectric element, effectively improve the output power in the low frequency and low amplitude environment; the overall system is symmetrically distributed, so that the piezoelectric energy harvesting device can maintain force balance in a static state, when the device is subjected to vibration excitation in one direction, a pair of piezoelectric cantilever beam structures 2 of the device directly receive vibration excitation and generate voltage output, breaking the original balance state, another pair of piezoelectric cantilever beam structures 2 will also vibrate synchronously due to the action of magnetic coupling, improving the overall vibration response, improving the efficiency of energy harvesting, widening the working frequency band of the device, so that it can adapt to a wider external excitation frequency; the cross-shaped support frame 5 is provided with a sliding groove, the 45° inclined lower clamp can drive the piezoelectric cantilever beam structure 2 to slide in the sliding groove, and the position is locked through bolts and nuts, the installation position of the piezoelectric cantilever beam structure 2 can be adjusted according to different external vibration frequencies, flexible matching of the working frequency is realized, and it is ensured that the device always operates in the best state; the base 3 is fixed with equipment through four mounting holes, so that the device can stably operate in the vibration environment and will not affect the collection performance due to shaking or displacement.

[0027] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A tunable frequency magnetic coupling piezoelectric energy harvesting device with elastic magnification structure, characterized by: It includes spring support structure (1), piezoelectric cantilever beam structure (2); The spring support structure (1) includes base (3), spring (4), cross-shaped support frame (5); The upper surface of the base (3) is provided with an annular groove, and the outside has four mounting holes (6) which can be fixed by bolts and nuts, the lower surface of the cross-shaped support frame (5) is provided with an annular groove, and the inside has four cross-shaped distribution sliding grooves, one end of the spring (4) is arranged in the annular groove of the base (3), and the other end is arranged in the annular groove of the cross-shaped support frame (5); The piezoelectric cantilever beam structure (2) includes 45° inclined lower clamp (7), copper base (8), piezoelectric ceramic (9), magnet upper clamp (10), permanent magnet (11), rectangular clamp (12), the 45° inclined lower clamp (7) is arranged in the sliding groove of the cross-shaped support frame (5), and can be slid and clamped in the sliding groove by the cooperation of the threaded hole (13), bolt and nut, the upper end of the 45° inclined lower clamp (7) is provided with a clamping groove, and clamping holes (14) are arranged on both sides of the clamping groove, the upper surface of the copper base (8) is pasted with piezoelectric ceramic (9) through conductive adhesive, the lower end of the magnet upper clamp (10) is provided with a clamping groove, and clamping holes (14) are arranged at both ends of the clamping groove, the rectangular clamp (12) and the upper end face of the magnet upper clamp (10) can be cooperated by the bolts and nuts of the clamping holes (14) to arrange the permanent magnet (11) in the middle of the clamp, one end of the copper base (8) is arranged in the clamping groove of the 45° inclined lower clamp (7), and the other end is arranged in the clamping groove of the magnet upper clamp (10).

2. The adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure according to claim 1, characterized in that: The base (3) has four mounting holes (6) on the outside, and the piezoelectric energy collection device can be installed on the equipment by the cooperation of bolts and nuts; By fixing the mounting holes on the base, the stable operation of the device under vibration conditions can be ensured.

3. The adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure according to claim 1, characterized in that: The 45° inclined lower clamp (7) can slide in the sliding groove of the cross-shaped support frame (5), and can be clamped and fixed by the cooperation of the threaded hole (13), bolt and nut, according to different external excitation, the installation position is adjusted, and the energy collection frequency is adjustable.

4. The adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure according to claim 1, characterized in that: The clamping groove of the 45° inclined lower clamp (7) can be clamped and fixed by the cooperation of the clamping holes (14), and the clamping groove of the magnet upper clamp (10) can be clamped and fixed by the cooperation of the clamping holes (14).

5. The adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure according to claim 1, characterized in that: There are four piezoelectric cantilever beam structures (2), which are centrally symmetrically distributed, and the N poles of the permanent magnets (11) of the four piezoelectric cantilever beam structures (2) face the inside and repel each other.

6. The adjustable frequency magnetic coupling piezoelectric energy harvesting device with elastic amplification structure according to claim 1, characterized in that: The piezoelectric cantilever beam structure (2) is arranged at an angle of 45°, and a single piezoelectric cantilever beam structure (2) can collect vibration energy in two directions, thereby improving the energy collection efficiency.

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