阅读说明：本技术 一种悬臂梁振子固有频率可调的压电发电结构 (Cantilever beam oscillator natural frequency adjustable piezoelectricity power generation structure ) 是由 卢宁宁 郭秋泉 赵呈春 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种悬臂梁振子固有频率可调的压电发电结构,安装在振源上,包括加持基座、压电振子、L型滑轨、质量滑块和位置调节机构,所述加持基座安装在振源上,压电振子的一端固定在加持基座上构成悬臂梁,所述L型滑轨固定在压电振子的另一端；所述质量滑块滑动设置在L型滑轨上,所述位置调节结构的一端和质量滑块相连,另一端和所述L型滑轨相连,通过位置调节结构调节质量滑块在L型滑轨上的位置。传统方式的振子具有固定的固有频率,对于振动环境复杂、应用场合多变的工况,其通用性差,发电效率低,如需提升发电效果还需针对专门环境设计定制的振子方案以适应所使用的激励频率。(The invention discloses a piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator, which is arranged on a vibration source and comprises a holding base, the piezoelectric vibrator, an L-shaped sliding rail, a mass sliding block and a position adjusting mechanism, wherein the holding base is arranged on the vibration source, one end of the piezoelectric vibrator is fixed on the holding base to form a cantilever beam, and the L-shaped sliding rail is fixed at the other end of the piezoelectric vibrator; the quality slider slides and sets up on L type slide rail, the one end and the quality slider of position control structure link to each other, the other end with L type slide rail links to each other, adjusts the position of quality slider on L type slide rail through the position control structure. The vibrator of traditional mode has fixed natural frequency, and to the operating mode that the vibration environment is complicated, the application scenario is changeable, its commonality is poor, and the generating efficiency is low, if need promote the generating effect still need be directed against the excitation frequency that special environment design customization still need be in order to adapt to.)

1. A piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator is mounted on a vibration source and is characterized by comprising a clamping base (1), the piezoelectric vibrator (8), an L-shaped sliding rail (4), a mass sliding block (2) and a position adjusting mechanism, wherein the clamping base (1) is mounted on the vibration source, one end of the piezoelectric vibrator (8) is fixed on the clamping base (1) to form a cantilever beam, and the L-shaped sliding rail (4) is fixed at the other end of the piezoelectric vibrator (8); the mass sliding block (2) is arranged on the L-shaped sliding rail (4) in a sliding mode, one end of the position adjusting structure is connected with the mass sliding block (2), the other end of the position adjusting structure is connected with the L-shaped sliding rail (4), and the position of the mass sliding block (2) on the L-shaped sliding rail (4) is adjusted through the position adjusting structure.

2. The cantilever beam vibrator natural frequency adjustable piezoelectric power generation structure of claim 1, wherein the L-shaped slide rail (4) comprises a support section (405) and a slide rail section (404), the support section (405) is fixed on the piezoelectric vibrator (8), the slide rail section (404) is connected with the support section (405), the slide rail section (404) is parallel to the piezoelectric vibrator (8), and the slide rail section (404) is located on one side of the support section (405) close to the clamping base (1).

3. The cantilever oscillator natural frequency adjustable piezoelectric power generation structure according to claim 2, wherein the mass slider (2) is provided with a sliding slot (203), the mass slider (2) is arranged on the sliding rail section (404) through the sliding slot (203), and the mass slider (2) is located between the sliding rail section (404) and the piezoelectric oscillator (8).

4. The cantilever beam oscillator natural frequency adjustable piezoelectric power generation structure of claim 3, wherein the position adjustment mechanism comprises a screw rod (7), the mass slider (2) is provided with a first threaded hole (201), the support section (405) is provided with a hole (403), one end of the screw rod (7) is located in the first threaded hole (201), the other end of the screw rod (7) is provided with an adjustment knob (5), and the screw rod (7) passes through the hole (403).

5. The cantilever beam oscillator natural frequency adjustable piezoelectric power generation structure of claim 4, wherein the hole (403) is provided with a bearing (6), and the screw (7) passes through the bearing (6).

6. The cantilever beam oscillator natural frequency adjustable piezoelectric power generation structure of claim 5, wherein the support section (405) is provided with a second threaded hole (401), a limit screw (3) is arranged in the second threaded hole (401), and the limit screw (3) is abutted against the mass slider (2).

7. The cantilever beam oscillator natural frequency adjustable piezoelectric power generation structure according to claim 6, wherein a limit groove (202) is arranged at a sliding groove (203) on the mass sliding block (2), and the limit groove (202) is located at a position on the mass sliding block (2) corresponding to the limit screw (3).

8. The cantilever beam vibrator natural frequency adjustable piezoelectric power generation structure of claim 2, wherein the side of the slide rail section (404) far away from the piezoelectric vibrator (8) is provided with a natural frequency identification scale area (402).

Technical Field

The invention relates to a piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator, and belongs to the technical field of piezoelectric power generation.

Background

In the times that the IoT (internet of things) technology is strong nowadays, related intelligent products are paid much attention, various wireless sensor networks, intelligent IC modules, remote control systems and other micro-power consumption devices are widely applied to various fields, and power supply is one of bottlenecks that restrict the development of the micro-power consumption devices. The traditional wireless sensor power supply mainly adopts a battery, but the battery has a limited service life, and the wireless sensor system can normally work only by regular replacement and maintenance, so that the workload is large and the cost is high; in addition, in many application occasions, the nodes of the wireless sensor are often installed in severe environments such as toxic environments, radiation environments and the like, the requirements on the performance of the battery are strict, and the replacement of the battery is very convenient or even cannot be realized. Therefore, it is necessary to research an effective long-life power supply method and apply it to a micro power consumption device.

Comparing the prior patent technology, the method can find that: patent 201320797303.1 uses a mass disk whose displacement can be adjusted by rotation, but its spiral rod is cylindrical and does not change the mounting of piezoelectric ceramic plate. Patent 201420210015.6 has studied a self-adaptive resonant frequency adjusting device, but it needs to have external power supply power drive motor module work, and the complete mechanism is too bulky, and adjustable minimum natural frequency is very high, so does not possess the condition of through resonance energy absorption in the environment. Patent 201310686868.7 discloses a broadband piezoelectric vibration energy collecting device, which is designed to arrange a series of piezoelectric vibrator groups with different natural frequencies in a certain bandwidth frequency in a disc base, so as to drive the vibrators with similar frequencies to resonate by external vibration, which is obviously a design with low resource waste and efficiency. The cantilever beam oscillator vibration frequency adjusting device designed in the patent 201710388543.9 realizes the change of the natural frequency of the device by changing the clamping length of the oscillator, and has the disadvantage that the additional device outside the oscillator is too large, that is, the device can do much useless work when being placed in the vibration environment and can weaken the external vibration to a certain extent.

Based on the technical problems, the realization of adjusting the self frequency of the oscillator according to the external excitation frequency so as to achieve the optimal power generation effect becomes a technical problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator, which can adjust the self frequency of the vibrator according to external excitation frequency to realize mechanism resonance, thereby achieving the purpose of optimal power generation effect.

In order to solve the technical problems, the invention adopts the following technical scheme:

a piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator is arranged on a vibration source and comprises a clamping base, the piezoelectric vibrator, an L-shaped sliding rail, a mass sliding block and a position adjusting mechanism, wherein the clamping base is arranged on the vibration source, one end of the piezoelectric vibrator is fixed on the clamping base to form a cantilever beam, and the L-shaped sliding rail is fixed at the other end of the piezoelectric vibrator; the quality slider slides and sets up on L type slide rail, the one end and the quality slider of position control structure link to each other, the other end with L type slide rail links to each other, adjusts the position of quality slider on L type slide rail through the position control structure. The piezoelectric vibrator can be pasted with a piezoelectric ceramic piece on one side or double sides; and a certain substrate allowance can be reserved at the free tail end for bonding the L-shaped sliding rail, and the free tail end can also be completely covered by the piezoelectric ceramic piece to bond the L-shaped sliding rail on the PZT.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam vibrator, the L-shaped slide rail comprises a support section and a slide rail section, the support section is fixed on the piezoelectric vibrator, the slide rail section is connected with the support section, the slide rail section is parallel to the piezoelectric vibrator, and the slide rail section is positioned on one side, close to the clamping base, of the support section.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam vibrator, the mass sliding block is provided with the sliding groove, the mass sliding block is arranged on the sliding rail section through the sliding groove, and the mass sliding block is positioned between the sliding rail section and the piezoelectric vibrator. The weight of the mass sliding block is far larger than that of the L-shaped sliding rail, and the mass sliding block is guaranteed not to be in contact with the upper surface of the piezoelectric vibrator in a static or vibrating process.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam oscillator, the position adjusting mechanism comprises a screw rod, a first threaded hole is formed in the mass sliding block, a hole position is formed in the supporting section, one end of the screw rod is located in the first threaded hole, an adjusting knob is arranged at the other end of the screw rod, and the screw rod penetrates through the hole position.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam vibrator, the bearing is installed in the hole, and the screw penetrates through the bearing.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam oscillator, the support section is provided with a second threaded hole, a limit screw is arranged in the second threaded hole, and the limit screw abuts against the mass sliding block. The limiting screw also has the function of locking the mass sliding block, so that the phenomenon of left-right sliding in the vibration process is prevented.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam oscillator, a sliding groove on the mass sliding block is provided with a limiting groove, and the limiting groove is located on the mass sliding block and corresponds to the limiting screw.

In the piezoelectric power generation structure with the adjustable natural frequency of the cantilever beam oscillator, a scale area is arranged on the side surface, far away from the piezoelectric oscillator, of the slide rail section. The scales reflect the natural frequency of the vibrator, and the natural frequency of different positions is realized by adjusting the knob. The end position of the mass sliding block sliding leftwards is limited by a limit groove formed in the mass sliding block and a limit screw installed on the L-shaped sliding rail, and the end position of the mass sliding block sliding rightwards is the vertical inner surface of the L-shaped sliding rail.

Compared with the prior art, the invention can adjust the self frequency of the vibrator according to the external excitation frequency, and realize the mechanism resonance, thereby achieving the purpose of optimal power generation effect. The vibrator of traditional mode has fixed natural frequency, and to the operating mode that the vibration environment is complicated, the application scenario is changeable, its commonality is poor, and the generating efficiency is low, if need promote the generating effect still need be directed against the excitation frequency that special environment design customization still need be in order to adapt to. The device has the function of adjusting the inherent frequency of the cantilever beam oscillator, the designed mechanism can be freely adjusted in a wider frequency range, the use in different excitation environments is met, and the device is simple in structure, small in size and convenient to process and produce. The natural frequency of the mass slider is higher in the direction closer to the adjusting knob, mainly because the deformation restoring force of the L-shaped slide rail is fixed, the mass slider is also moved to the direction closer to the center of the cantilever beam in the direction of the adjusting knob, so the moment of gravity is smaller, and the natural frequency is higher.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a mass slide configuration;

fig. 3 is a schematic structural diagram of an L-shaped slide rail.

Reference numerals: 1-a clamping base, 2-a mass slide block, 3-a limit screw, 4-an L-shaped slide rail, 5-an adjusting knob, 6-a bearing, 7-a screw rod and 8-a piezoelectric vibrator; 201-a first threaded hole, 202-a limiting groove and 203-a sliding groove; 401-second threaded hole, 402-natural frequency identification scale area, 403-hole position, 404-slide rail section, 405-support section.

The invention is further described with reference to the following figures and detailed description.

Detailed Description

Example 1 of the invention: a piezoelectric power generation structure with adjustable natural frequency of a cantilever beam vibrator is arranged on a vibration source and comprises a clamping base 1, a piezoelectric vibrator 8, an L-shaped sliding rail 4, a mass sliding block 2 and a position adjusting mechanism, wherein the clamping base 1 is arranged on the vibration source, one end of the piezoelectric vibrator 8 is fixed on the clamping base 1 to form a cantilever beam, and the L-shaped sliding rail 4 is fixed at the other end of the piezoelectric vibrator 8; the mass sliding block 2 is arranged on the L-shaped sliding rail 4 in a sliding mode, one end of the position adjusting structure is connected with the mass sliding block 2, the other end of the position adjusting structure is connected with the L-shaped sliding rail 4, and the position of the mass sliding block 2 on the L-shaped sliding rail 4 is adjusted through the position adjusting structure.

The L-shaped slide rail 4 comprises a supporting section 405 and a slide rail section 404, the supporting section 405 is fixed on the piezoelectric vibrator 8, the slide rail section 404 is connected with the supporting section 405, the slide rail section 404 is parallel to the piezoelectric vibrator 8, and the slide rail section 404 is located on one side, close to the clamping base 1, of the supporting section 405. The mass slider 2 is provided with a sliding groove 203, the mass slider 2 is arranged on a sliding rail section 404 through the sliding groove 203, and the mass slider 2 is positioned between the sliding rail section 404 and the piezoelectric vibrator 8. The side of the slide rail section 404 remote from the piezoelectric vibrator 8 has a natural frequency identification scale area 402.