Piezoelectric energy harvesting device based on acoustic black hole in hydraulic pipeline

Abstract

The invention discloses a piezoelectric energy harvesting device based on an acoustic black hole in a hydraulic pipeline. The piezoelectric energy harvesting device comprises a top cover, a shell, an end cover, a piezoelectric ceramic piece, a vibrating plate, the acoustic black hole, a base, a three-way pipe joint, a quick-plug pipe joint and the like. The piezoelectric plate is composed of piezoelectric ceramics and a copper substrate, hydraulic oil flows into the acoustic black hole through the three-way pipe joint, and when the acoustic black hole is filled with the hydraulic oil, pressure pulsation reaches the maximum at the upper end of the acoustic black hole to cause vibration of the vibration plate, so that the piezoelectric plate deforms to generate electric energy. The acoustic black hole is introduced into the piezoelectric energy harvesting structure, noise and vibration in a fluid pipeline can be reduced, the piezoelectric energy harvesting efficiency can be improved through the wave energy focusing effect of the acoustic black hole, and the piezoelectric energy harvesting structure has wide application prospects in the field of power supply for low-power-consumption components.

Description

Technical Field

[0001] The present invention designs a piezoelectric energy harvesting device based on an acoustic black hole for use in a hydraulic pipeline, and specifically relates to the technical field of improving the efficiency of the piezoelectric energy harvesting device by utilizing the pressure pulsation in the hydraulic pipeline through the wave energy focusing effect of an acoustic black hole. Background Art

[0002] Hydraulic systems have been widely used in the field of modern machinery due to their high efficiency, fast response speed, stable and reliable operation. However, in hydraulic pipelines, due to the influence of the natural frequency of the hydraulic pump itself, the fluid pressure in the pipeline will show pulsation characteristics, and there is a lot of vibration energy in these pressure pulsations. Piezoelectric energy capture technology is a device that converts mechanical energy into electrical energy through the pressure pulsation of the fluid, thereby providing energy for some low-power components in the hydraulic system. As the country vigorously promotes the development of green energy, piezoelectric energy capture technology is being widely studied.

[0003] Currently in the hydraulic field, piezoelectric energy harvesting technology is an emerging energy harvesting method, but existing piezoelectric energy harvesting devices are often composed of multiple precision components, which not only increases the manufacturing cost, but also increases the difficulty of maintenance. This is a major challenge for hydraulic systems that pursue high efficiency, low cost and easy maintenance. In addition, low energy conversion efficiency is also a key problem that current piezoelectric energy harvesting technology has to face. Due to the influence of various factors such as material properties, structural design and working environment, existing devices often have a large amount of energy loss in the process of converting mechanical energy into electrical energy, resulting in low overall efficiency and difficulty in meeting energy requirements in practical applications. Therefore, it is of great significance to develop a piezoelectric energy harvesting device with simple structure and high energy conversion efficiency. Summary of the invention

[0004] In response to the pressure pulsation generated by the fluid in the hydraulic pipeline, the present invention provides a piezoelectric energy harvester based on an acoustic black hole for use in the hydraulic pipeline. The energy harvester is connected to the hydraulic pipeline through a quick-plug pipe joint. In order to increase the power generation, the present invention embeds the acoustic black hole into the device. Through the wave energy focusing effect of the acoustic black hole, the pressure pulsation of the hydraulic oil reaches the maximum when it reaches the surface of the piezoelectric piece, increasing the deformation of the piezoelectric piece, thereby increasing the generated electrical energy. In order to make the hydraulic oil flow in from the bottom of the acoustic black hole, a three-way pipe joint is connected in the base to change the inflow direction of the hydraulic oil.

[0005] The piezoelectric energy capture device based on acoustic black hole used in hydraulic pipelines includes a top cover, a shell, an end cover, a piezoelectric ceramic sheet, a vibration plate, an acoustic black hole, a base, a three-way pipe joint, a quick-plug pipe joint, etc.

[0006] The shell is a prismatic shell, and the boss on the lower surface of the shell is provided with an internal threaded hole for connecting a quick-plug pipe joint, and the lower bottom surface is provided with a sealing groove for sealing between the base and the shell. The surface of the upper cylindrical cavity is provided with an internal thread for connecting the top cover. The cylindrical cavities inside the shell are of different sizes to facilitate the placement of the liquid inlet device and the piezoelectric capture device; the top cover is in the shape of a cylindrical boss, with a circular through hole in the middle for leading out the piezoelectric sheet wires, and the outer surface of the lower cylinder is provided with an external thread for connecting the shell.

[0007] The acoustic black hole is cylindrical, with a sealing groove and a through hole for bolt fixing on its upper surface, and a stepped internal structure, which is fixed by transitional fit with the surface of the lower cavity of the shell.

[0008] The end cover and the base are both circular, with a threaded hole in the middle of the end cover for connection with the three-way pipe joint, a groove on the lower surface for placing the vibration plate and the waterproof membrane, a sealing groove on the upper surface of the groove, and a cylindrical through hole in the middle for placing the lead of the piezoelectric piece. A threaded through hole is opened in the middle of the base for connection with the three-way pipe joint, and a sealing groove is provided on its upper surface. There are through holes around the end cover and the base ring for bolt fixing.

[0009] Compared with the prior art, the invention has the following beneficial effects.

[0010] (1) The present invention is based on the acoustic black hole wave energy focusing effect, which concentrates the pressure pulsation of the hydraulic oil in the acoustic black hole, so that the pulsation wave reaches its maximum when it reaches the bottom of the piezoelectric sheet, thereby increasing the deformation of the piezoelectric sheet and generating more electrical energy.

[0011] (2) The present invention introduces an acoustic black hole into the piezoelectric energy harvester, thereby improving the energy harvesting efficiency and making the overall structure simpler.

[0012] Description of the drawings.

[0013] Figure 1 It is a schematic diagram of the general assembly of the present invention.

[0014] Figure 2 It is a schematic diagram of the structure of the shell.

[0015] Figure 3 It is a schematic diagram of the structure of the top cover.

[0016] Figure 4 It is a structural diagram of the end cover.

[0017] Figure 5 This is a schematic diagram of the structure of an acoustic black hole.

[0018] Figure 6 It is a schematic diagram of the structure of the base.

[0019] The markings in the above figure are: 1. Shell; 2. Top cover; 3. End cover; 4. Fixing bolt; 5, 8, 11, 13, O-ring; 6. Piezoelectric sheet; 7. Vibration plate; 9. Acoustic black hole; 10. Three-way pipe joint; 12. Base; 14. Quick-plug pipe joint; 1.1, 1.6, 12.3, internal thread; 1.2, upper cavity; 1.3, lower cavity; 1.5, 3.2, 9.2, 12.2, sealing groove; 2.1, external thread; 2.2, 3.3, lead hole; 2.3, bottom surface of top cover; 1.4, 3.1, 9.1, 12.1, fixing through hole; 3.4, fixing step surface.

[0020] Specific implementation method.

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 An embodiment of the present invention comprises a shell 1, a top cover 2, an end cover 3, a fixing bolt 4, an O-ring (5, 8, 11, 13), a piezoelectric sheet 6, a vibration plate 7, an acoustic black hole 9, a three-way pipe joint 10, a base 12, and a quick-plug pipe joint 13.

[0023] The housing 1 is as Figure 2 As shown, the interior includes internal threads 1.1, 1.6, an upper cavity 1.2, a lower cavity 1.3, a bolt fixing through hole 1.4 and a sealing groove 1.5. The internal thread 1.1 cooperates with the external thread 2.1 of the top cover, and the internal thread 1.5 is used to connect the quick-plug pipe connector 12, which is connected to the system pipeline through the quick-plug pipe connector 12 to realize the entry of hydraulic oil, and the lower cavity 1.3 is used to place the base 12, the acoustic black hole 9 and the three-way pipe connector 10.

[0024] The base 12 is as follows Figure 6 As shown, the three-way pipe joint 10 is placed on the bottom surface of the lower cavity of the shell through the transition fit between the outer surface and the inner surface of the shell, a sealing ring is placed in the middle of the contact surface, and the three-way pipe joint 10 is placed on the upper surface of the base 12 through a threaded connection.

[0025] The acoustic black hole 9 is as follows Figure 5 As shown, it is placed above the base through the transition fit between its outer surface and the inner surface of the lower cavity of the shell, and is sealed by a sealing ring at the contact surface. When the hydraulic oil enters the acoustic black hole, the hydraulic oil will fill the internal cavity from the bottom of the acoustic black hole due to the action of the three-way pipe joint.

[0026] The end cap 3 is as follows Figure 4As shown, the vibration plate and the waterproof membrane are placed in the fixed step surface 3.4, the upper and lower surfaces of the vibration plate are affixed with waterproof membranes, the portion of the upper surface of the vibration plate that contacts the fixed step surface is sealed with a sealing ring, the piezoelectric sheet is attached to the vibration plate and placed in the lead hole 3.3, the lower surface of the end cover 3 contacts the upper surface of the acoustic black hole 9, and the contact surface is sealed with a sealing ring.

[0027] Furthermore, after the end cover 3, the acoustic black hole 9 and the base 12 are placed, in order to prevent relative rotation, the through holes 1.4, 3.1, 9.1 and 12.1 are fixed by bolts. Finally, the top cover is installed by the external thread 2.1 cooperating with the internal thread 1.1 to realize the installation of the whole device.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A piezoelectric energy harvesting device based on acoustic black hole for use in hydraulic pipelines, characterized in that: Top cover, shell, end cover, piezoelectric ceramic sheet, vibration plate, acoustic black hole, base, three-way pipe joint, quick-plug pipe joint, etc.; the shell is prismatic, with two cylindrical cavities of different sizes inside, a threaded hole connected to the quick-plug pipe joint on the lower bottom surface, and a sealing groove and a through hole for bolt fixing on the inner bottom surface; the top cover is frustum-conical, with an external thread on the lower cylindrical surface and a through hole in the middle for the lead.

2. A piezoelectric energy harvesting device based on acoustic black hole for use in a hydraulic pipeline according to claim 1, characterized in that: The acoustic black hole is cylindrical and is placed in the lower cavity of the shell. Its upper surface is provided with a sealing groove and a through hole for bolt fixing, and its internal structure is stepped.

3. The piezoelectric energy harvesting device based on acoustic black hole used in hydraulic pipeline according to claim 1, characterized in that: The end cover is in a circular shape with through holes around the ring for bolt fixing. The groove on the lower surface of the end cover is used to place the vibration plate and the waterproof membrane. The upper surface of the groove has a sealing groove, and the circular through hole in the middle is used to place the piezoelectric sheet and the lead wire. The upper surface of the base has a sealing groove, and a threaded through hole in the middle is opened for connection to a three-way pipe joint.

4. The piezoelectric energy harvesting device based on acoustic black hole used in hydraulic pipeline according to claim 1, characterized in that: The base is in the shape of a circular ring, a sealing groove is provided on the upper surface of the base, and a threaded through hole for connecting a three-way pipe joint is provided in the middle.

5. The piezoelectric energy harvesting device based on acoustic black hole used in hydraulic pipeline according to claim 1, characterized in that: The shell, top cover, upper pressure cover, acoustic black hole and lower base are all made of insulating materials, and the vibration plate is made of aluminum alloy.

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