PVDF air pressure energy converter based on connecting rod displacement amplification module

Abstract

The invention discloses a PVDF air pressure energy converter based on a connecting rod displacement amplification module. The energy converter comprises a PVDF piezoelectric unit, a bolt assembly I, a hinge, a bolt assembly II, the connecting rod displacement amplification module, a rear support assembly, a bolt assembly III, an air cylinder, a clamping spring and a front support, and the PVDF piezoelectric unit is installed on the hinge through the bolt assembly I; one end of the connecting rod displacement amplification module is installed on the hinge through a bolt assembly II, and the other end of the connecting rod displacement amplification module is installed on the rear support assembly and the front support through snap springs. The air cylinder is installed on the rear support assembly through a bolt assembly III and connected with the connecting rod displacement amplification module. The front support is installed on the rear support assembly. The converter can improve the electric energy output of the PVDF piezoelectric material, enables the PVDF piezoelectric material to generate larger strain deformation in a limited space, and promotes the wireless development of the electric energy supply of a low-power-consumption sensor of a pneumatic system.

Description

Technical Field

[0001] The invention belongs to the field of energy collection and relates to an energy converter, in particular to a PVDF air pressure energy converter based on a connecting rod displacement amplification mechanism. Background Art

[0002] Pneumatic systems are widely used in manufacturing plants of all walks of life as an important means of realizing production automation because of their advantages such as high energy density, wide power source, no pollution, fast response and high reliability. However, the pneumatic industrial field environment is complex, changeable and harsh, such as high vibration, high electromagnetic radiation and high noise, etc., coupled with the uncertainty of the time when the field equipment failure occurs, it is impossible for the staff to monitor the operating conditions (such as flow, pressure, etc.) and environmental parameters (such as temperature, humidity, etc.) of various pneumatic components at the industrial site normally. In addition, due to the mobility of industrial field equipment, if traditional wired cables are used for data transmission, the layout and wiring are cumbersome and complex, which will consume a lot of manpower, material resources and financial resources, with poor scalability and mobility, high installation cost and poor monitoring effect. If battery power is selected, the battery must be replaced every once in a while, and most of these components and equipment have to work uninterruptedly for a long time. If the battery is replaced frequently, it will inevitably increase the cost and bring inconvenience.

[0003] Piezoelectric energy harvesters, as a new energy harvesting technology, have the advantages of simple structure, high energy density, no electromagnetic interference, no heat generation, and easy integration. They have become a research hotspot in the field of kinetic energy harvesting and self-powered wireless sensor nodes. Therefore, by using piezoelectric energy harvesting technology to convert the pressure energy of the pneumatic system into electrical energy to meet the power supply requirements of low-power sensors, the energy supply problem of low-power wireless nodes in the pneumatic system can be solved. Generally speaking, the materials of piezoelectric energy harvesters can be divided into PZT piezoelectric ceramics and PVDF piezoelectric polymers. PZT has a large piezoelectric constant and good piezoelectric properties, however, it has poor flexibility, is fragile, and cannot withstand large external forces. On the contrary, PVDF piezoelectric materials have good flexibility and durability, but insufficient power output is the key issue restricting its application, and its good piezoelectric properties usually rely on large strain deformation. Summary of the invention

[0004] In order to solve the technical problems of traditional piezoelectric energy harvesters, such as high power output but poor durability and fragility, and good durability but low power output, the present invention provides a PVDF air pressure energy converter based on a connecting rod displacement amplification module. The converter can increase the power output of PVDF piezoelectric materials, so that it can produce greater strain deformation in a limited space, and promote the wireless development of low-power sensor power supply for pneumatic systems.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A PVDF air pressure energy converter based on a connecting rod displacement amplification module comprises a PVDF piezoelectric unit, a bolt assembly I, a hinge, a bolt assembly II, a connecting rod displacement amplification module, a rear support assembly, a bolt assembly III, a cylinder, a retaining spring and a front support, wherein:

[0007] The PVDF piezoelectric unit is mounted on the hinge via a bolt assembly 1;

[0008] One end of the connecting rod displacement amplification module is mounted on the hinge through a bolt assembly II, and the other end is mounted on the rear support assembly and the front support respectively through a retaining spring;

[0009] The cylinder is mounted on the rear support assembly through a bolt assembly III and is connected to the connecting rod displacement amplification module;

[0010] The front support is mounted on the rear support assembly.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The present invention selects PVDF piezoelectric materials with good flexibility, adopts a pure bending deformation method with hinges at both ends, and designs a connecting rod displacement amplification module, so that the PVDF piezoelectric material is subjected to greater and more uniform strain changes during bending deformation, which greatly improves the power output of the PVDF piezoelectric material, while taking into account durability and high-performance power output.

[0013] 2. The air pressure energy converter of the present invention is suitable for multiple PVDF piezoelectric units to work simultaneously to further increase the electrical energy output of the air pressure energy converter.

[0014] 3. The present invention adopts the method of stacking and parallel connection and adding a gap between adjacent PVDF piezoelectric units, thereby saving space and volume while increasing the output electrical energy of multiple PVDF piezoelectric units when they are bent and deformed, thereby better promoting the development of wireless and miniaturized power supply for low-power wireless sensors in pneumatic systems and meeting the power supply needs of low-power sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structural diagram of the PVDF air pressure energy converter based on the connecting rod displacement amplification module;

[0016] Figure 2 It is a schematic diagram of the structure of the PVDF piezoelectric unit;

[0017] Figure 3 is a schematic diagram of the elastic substrate structure;

[0018] Figure 4 is a schematic diagram of the hinge structure;

[0019] Figure 5 It is a schematic diagram of the structure of the connecting rod displacement amplification module;

[0020] Figure 6 is a schematic diagram of the rotating frame structure;

[0021] Figure 7 It is a schematic diagram of the flat pin structure;

[0022] Figure 8 To enlarge the schematic diagram of the pendulum structure;

[0023] Fig. 9 It is a schematic diagram of the fixed limit axis structure;

[0024] Fig.10 is a schematic diagram of the connecting rod structure;

[0025] Fig.11 It is a schematic diagram of the structure of the intermediate moving shaft;

[0026] Fig.12 It is a schematic diagram of the structure of the intermediate connection block;

[0027] Fig.13 is a schematic diagram of the structure of the rear support assembly;

[0028] Fig.14 is a schematic diagram of the rear support structure;

[0029] Fig.15 It is a schematic diagram of the structure of the cylinder connecting frame;

[0030] Fig.16 It is a schematic diagram of the cylinder structure;

[0031] Fig.17 It is a schematic diagram of the front support structure;

[0032] Fig.18 Schematic diagram of the working principle of the PVDF air pressure energy converter based on the connecting rod displacement amplification module. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0034] The present invention provides a PVDF air pressure energy converter based on a connecting rod displacement amplification module, such as Figure 1As shown in the figure, the pneumatic energy converter includes a PVDF piezoelectric unit 1, a bolt assembly I 2, a spacer gasket 3, a hinge 4, a bolt assembly II 5, a connecting rod displacement amplification module 6, a rear support assembly 7, a bolt assembly III 8, a cylinder 9, screws 10, a circlip 11, and a front support 12, where:

[0035] The PVDF piezoelectric unit 1 is mounted on the hinge 4 through the bolt assembly I 2, and a spacer gasket 3 is provided between multiple PVDF piezoelectric units 1;

[0036] One end of the connecting rod displacement amplification module 6 is mounted on the hinge 4 through the bolt assembly II 5, and the other end is respectively mounted on the rear support assembly 7 and the front support 12 through the circlip 11;

[0037] The cylinder 9 is mounted on the rear support assembly 7 through the bolt assembly III 8 and is connected to the connecting rod displacement amplification module 6 by means of a threaded connection;

[0038] The front support 12 is mounted on the rear support assembly 7 through the screws 10.

[0039] As Figure 2-3 shown, the PVDF piezoelectric unit 1 includes an elastic substrate 1-1, a double-sided conductive tape 1-2, a PVDF piezoelectric film 1-3, and a single-sided conductive tape 1-4, where:

[0040] One side of the PVDF piezoelectric film 1-3 is pasted on the elastic substrate 1-1 through the double-sided conductive tape 1-2. The double-sided conductive tape 1-2 serves both as a tape and as a conductive electrode of the PVDF piezoelectric unit 1;

[0041] The single-sided conductive tape 1-4 is pasted on the other side of the PVDF piezoelectric film 1-3 and serves as the other conductive electrode of the PVDF piezoelectric unit 1;

[0042] The elastic substrate 1-1 is provided with two substrate connection holes 1-1-1, which are symmetrically distributed at both ends of the elastic substrate 1-1. The PVDF piezoelectric unit 1 is connected to the hinge 4 through the bolt assembly I 2 and the substrate connection holes 1-1-1;

[0043] There are n PVDF piezoelectric units 1, where 2 < n < 10. The n PVDF piezoelectric units 1 are sequentially connected in parallel and stacked on top of each other to form multiple piezoelectric energy harvesting units, where: a spacer gasket 3 with a thickness of h is provided between adjacent PVDF piezoelectric units 1, and 0.5 mm < h < 10 mm, which is used to separate the multiple PVDF piezoelectric units 1 so that when adjacent PVDF piezoelectric units 1 undergo bending deformation, they do not affect each other and the bending deformation is more sufficient.

[0044] As Figure 4As shown, the upper hinge of the hinge 4 is provided with two hinge connection holes I4-1, and the lower hinge is provided with two hinge connection holes II4-2, wherein:

[0045] The hinge connection holes I4-1 are symmetrically distributed on the upper hinge of the hinge 4, and their positions and center distances correspond to the substrate connection holes 1-1-1. The PVDF piezoelectric unit 1 is connected to the hinge 4 through the hinge connection holes I4-1, the substrate connection holes 1-1-1 and the bolt assembly I2.

[0046] The hinge connection holes II4-2 are symmetrically distributed on the lower hinge of the hinge 4, and the connecting rod displacement amplification module 6 is installed on the hinge 4 through the hinge connection holes II4-2 and the bolt assembly II5.

[0047] like Figure 5 to Figure 12 As shown, the connecting rod displacement amplification module 6 includes a rotating frame 6-1, a flat pin shaft 6-2, an amplifying swing rod 6-3, a fixed limit shaft 6-4, a tension spring 6-5, a connecting rod 6-6, an intermediate moving shaft 6-7 and an intermediate connecting block 6-8, wherein:

[0048] The rotating frame 6-1 is provided with two rotating frame connection holes I6-1-1, two rotating frame connection holes II6-1-2 and four limiting grooves 6-1-3;

[0049] The end of the flat pin 6-2 is provided with a pin retaining ring groove 6-2-1;

[0050] One end of the amplified swing rod 6-3 is provided with a rotating frame connection hole III6-3-1 and two limit columns 6-3-4, and the other end is provided with a fixed limit shaft connection hole 6-3-2 and a connecting rod connection hole I6-3-3;

[0051] The hole distance between the rotating frame connection hole III6-3-1 and the fixed limit shaft connection hole 6-3-2 is m, the hole distance between the fixed limit shaft connection hole 6-3-2 and the connecting rod connection hole I6-3-3 is n, and the displacement amplification ratio of the amplified swing rod 6-3 is n / m;

[0052] The fixed limit shaft 6-4 is provided with a support spring groove 6-4-1, an enlarged swing arm spring groove 6-4-2 and a swing arm limit shaft shoulder 6-4-3, and the support spring groove 6-4-1, the enlarged swing arm spring groove 6-4-2 and the swing arm limit shaft shoulder 6-4-3 are symmetrically distributed at both ends of the fixed limit shaft 6-4;

[0053] The two ends of the connecting rod 6-6 are respectively provided with a connecting rod connecting hole II6-6-1;

[0054] The intermediate moving shaft 6-7 is provided with a connecting rod retaining spring groove 6-7-1 and a connecting rod limiting shaft shoulder 6-7-2, and the connecting rod retaining spring groove 6-7-1 and the connecting rod limiting shaft shoulder 6-7-2 are symmetrically distributed at both ends of the intermediate moving shaft 6-7;

[0055] The intermediate connecting block 6-8 is provided with a connecting column 6-8-1 and a movable shaft mounting hole 6-8-2;

[0056] The rotating frame connection holes I6-1-1 are symmetrically distributed on the top surface of the rotating frame 6-1, and their positions correspond to the hinge connection holes II4-2, and are used to connect with the hinge 4;

[0057] The rotating frame connecting hole II6-1-2 and the limiting groove 6-1-3 are symmetrically distributed on both sides of the rotating frame 6-1;

[0058] The rotating frame 6-1 is installed on the enlarged swing rod 6-3 through the rotating frame connecting hole II6-1-2, the rotating frame connecting hole III6-3-1 and the flat head pin 6-2, and is limited by the cooperation of the retaining spring 11 and the retaining spring groove 6-2-1 of the pin;

[0059] The limiting groove 6-1-3 cooperates with the limiting column 6-3-4 to limit the rotation angle of the rotating frame 6-1 when the swing arm 6-3 swings, so that the direction of the rotating frame connecting hole I6-1-1 always remains upward;

[0060] The amplified swing rod 6-3 is installed on the swing rod limit shaft shoulders 6-4-3 at both ends of the fixed limit shaft 6-4 through the fixed limit shaft connection hole 6-3-2, and is limited by the cooperation of the retaining spring 11 and the amplified swing rod retaining spring groove 6-4-2;

[0061] The connecting rod connecting hole I6-3-3 and the connecting rod connecting hole II6-6-1 connect the amplified swing rod 6-3, the tension spring 6-5 and the connecting rod 6-6 together through the flat head pin 6-2 and the retaining spring 11;

[0062] The intermediate connecting block 6-8 is installed at the middle position of the intermediate moving shaft 6-7 through the moving shaft installation hole 6-8-2;

[0063] The connecting rod 6-6 is installed on the connecting rod limiting shoulder 6-7-2 of the intermediate movable shaft 6-7 through the connecting rod connecting hole II6-6-1, and is limited by the retaining spring 11 and the connecting rod retaining spring groove 6-7-1.

[0064] like Figure 13 to Figure 15 As shown, the rear support assembly 7 includes a rear support 7-1, a cylinder connecting frame 7-2 and a bolt assembly IV7-3, wherein:

[0065] The rear support 7-1 is provided with a cylinder connecting frame mounting hole 7-1-1, a limit shaft mounting hole I7-1-2 and a threaded hole I7-1-3;

[0066] The cylinder connecting frame 7-2 is provided with a cylinder mounting hole 7-2-1 and a rear support mounting hole 7-2-2;

[0067] The cylinder connecting frame 7-2 is installed on the rear support 7-1 through the rear support mounting hole 7-2-2, the cylinder connecting frame mounting hole 7-7-1 and the bolt assembly IV7-3.

[0068] like Fig.16 As shown, the cylinder 9 is provided with an air inlet 9-1, a fixed installation hole 9-2, a piston rod connection hole 9-3 and an exhaust port 9-4, wherein:

[0069] The cylinder 9 is mounted on the cylinder connecting frame 7-2 through the fixed mounting hole 9-2, the cylinder mounting hole 7-2-1 and the bolt assembly III8;

[0070] The piston rod connecting hole 9-3 and the connecting column 6-8-1 connect the cylinder 9 and the displacement amplification module 6 together through threaded connection.

[0071] like Fig.17 As shown, the front support 12 is provided with a limited axis mounting hole II12-1 and a front support fixed mounting hole 12-2, wherein:

[0072] The displacement amplification module 6 is respectively mounted on the rear support 7-1 and the front support 12 through the fixed limit shaft 6-4, the limit shaft mounting hole I7-1-2 and the limit shaft mounting hole II12-1, and is axially limited by the retaining spring 11 and the retaining spring groove 6-4-1 of the support;

[0073] The front support 12 is installed on the rear support 7-1 through the front support fixing hole 12-2, the threaded hole I7-1-3 and the screw 10.

[0074] Working principle:

[0075] like Fig.18As shown, the present invention is based on the connecting rod displacement amplification module, and utilizes the positive piezoelectric effect of piezoelectric materials to convert the pressure energy in the pneumatic system into a large strain bending deformation of the PVDF piezoelectric unit 1, so as to extract the piezoelectric energy of the PVDF piezoelectric unit 1 more efficiently. The specific process is: when the gas enters the rodless chamber 102 of the cylinder 9 through the air inlet 9-1 and the flow channel 103, the piston rod 101 moves downward, the angle between the connecting rods 6-6 increases, the tension spring 6-5 is in a stretched state, and the amplified rocker arm 6-3 swings inward, thereby converting the small longitudinal displacement of the piston rod into a large displacement bending deformation in the horizontal direction of the PVDF piezoelectric unit 1 connected to the hinge 4, thereby increasing the electrical energy generated by the PVDF piezoelectric unit. The excess gas pressed out of the rod chamber 100 of the cylinder 9 is discharged to the atmosphere through the exhaust hole 9-4. When no gas enters the rodless chamber 102 of the cylinder 9, the piston rod 101 moves upward under the dual action of the tensile force of the tension spring 6-5 and the elastic force of the PVDF piezoelectric unit 1 itself, the tension spring 6-5 restores its original length, the amplified swing rod 6-3 swings outward, and the PVDF piezoelectric unit 1 returns to the initial bending deformation state. Therefore, when the periodic gas discharged from the reversing valve in the pneumatic system flows into the air inlet 9-1, the PVDF piezoelectric unit 1 will undergo periodic large strain bending deformation to generate electrical energy.

Claims

1. A PVDF air pressure energy converter based on a connecting rod displacement amplification module, characterized in that The energy converter includes a PVDF piezoelectric unit, bolt assembly I, hinge, bolt assembly II, link displacement amplification module, rear support assembly, bolt assembly III, cylinder, snap ring and front support, where: The PVDF piezoelectric unit is mounted on the hinge through bolt assembly I; One end of the link displacement amplification module is mounted on the hinge through bolt assembly II, and the other end is respectively mounted on the rear support assembly and the front support through snap rings; The cylinder is mounted on the rear support assembly through bolt assembly III and is connected to the link displacement amplification module; The front support is mounted on the rear support assembly.

2. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 1 is characterized in that The PVDF piezoelectric unit includes an elastic substrate, double-sided conductive tape, PVDF piezoelectric film and single-sided conductive tape, where: One side of the PVDF piezoelectric film is pasted on the elastic substrate through double-sided conductive tape, and the double-sided conductive tape serves as one conductive electrode of the PVDF piezoelectric unit; The single-sided conductive tape is pasted on the other side of the PVDF piezoelectric film and serves as the other conductive electrode of the PVDF piezoelectric unit; The elastic substrate is provided with two substrate connection holes, which are symmetrically distributed at both ends of the elastic substrate. The PVDF piezoelectric unit is connected to the hinge through bolt assembly I and the substrate connection holes.

3. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 1 or 2, characterized in that There are n PVDF piezoelectric units, 2 < n < 10. The n PVDF piezoelectric units are sequentially connected in parallel and stacked together to form multiple piezoelectric energy harvesting units, where: a spacer with a thickness of h, 0.5 mm < h < 10 mm, is provided between adjacent PVDF piezoelectric units to separate the multiple PVDF piezoelectric units.

4. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 2 is characterized in that The upper hinge of the hinge is provided with two hinge connection holes I, and the lower hinge is provided with two hinge connection holes II, where: The hinge connection holes I are symmetrically distributed on the upper hinge of the hinge, and their positions and center distances correspond to the substrate connection holes. The PVDF piezoelectric unit is connected to the hinge through the hinge connection holes I, substrate connection holes and bolt assembly I; The hinge connection holes II are symmetrically distributed on the lower hinge of the hinge. The link displacement amplification module is mounted on the hinge through the hinge connection holes II and bolt assembly II.

5. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 4 is characterized in that The link displacement amplification module includes a rotating frame, flat head pin shaft, amplification swing rod, fixed limit shaft, tension spring, link, intermediate moving shaft and intermediate connection block, where: The rotating frame is provided with two rotating frame connection holes I, two rotating frame connection holes II and four limit grooves; The end of the flat head pin shaft is provided with a pin shaft snap ring groove; One end of the amplification swing rod is provided with a rotating frame connection hole III and two limit posts, and the other end is provided with a fixed limit shaft connection hole and a link connection hole I; The fixed limit shaft is provided with a support snap ring groove, an amplification swing rod snap ring groove and a swing rod limit shoulder. The support snap ring groove, the amplification swing rod snap ring groove and the swing rod limit shoulder are symmetrically distributed in pairs at both ends of the fixed limit shaft; Both ends of the link are respectively provided with a link connection hole II; The intermediate moving shaft is provided with a link snap ring groove and a link limit shoulder. The link snap ring groove and the link limit shoulder are symmetrically distributed in pairs at both ends of the intermediate moving shaft; The intermediate connection block is provided with a connecting column and a moving shaft mounting hole; The rotating frame connection holes I are symmetrically distributed on the top surface of the rotating frame, and their positions correspond to the hinge connection holes II, and are used to be connected to the hinge; The rotating frame connection hole II and the limiting groove are symmetrically distributed on both sides of the rotating frame; The rotating frame is installed on the enlarged swing arm through the rotating frame connecting hole II, the rotating frame connecting hole III and the flat head pin shaft, and is limited by the cooperation of the retaining spring and the retaining spring groove of the pin shaft; The limiting groove cooperates with the limiting column to limit the rotation angle of the rotating frame when the swing arm swings, so that the direction of the connecting hole I of the rotating frame always remains upward; The amplified swing rod is installed on the swing rod limit shaft shoulders at both ends of the fixed limit shaft through the fixed limit shaft connection hole, and is limited by the cooperation of the retaining spring and the retaining spring groove of the amplified swing rod; The connecting rod connecting hole I and the connecting rod connecting hole II connect the amplifying swing rod, the tension spring and the connecting rod together through a flat pin and a retaining spring; The middle connecting block is installed at the middle position of the middle moving shaft through the moving shaft installation hole; The connecting rod is installed on the connecting rod limiting shoulder of the intermediate moving shaft through the connecting rod connecting hole II, and is limited by the retaining ring and the connecting rod retaining ring groove.

6. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 5 is characterized in that The hole distance between the rotating frame connection hole III and the fixed limit shaft connection hole is m, the hole distance between the fixed limit shaft connection hole and the connecting rod connection hole I is n, and the displacement amplification ratio of the amplifying rocker arm is n / m.

7. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 5 is characterized in that The rear support assembly includes a rear support, a cylinder connecting frame and a bolt assembly IV, wherein: The rear support is provided with a cylinder connecting frame mounting hole, a limit shaft mounting hole I and a threaded hole I; The cylinder connecting frame is provided with a cylinder mounting hole and a rear support mounting hole; The cylinder connecting frame is installed on the rear support through the rear support mounting hole, the cylinder connecting frame mounting hole and the bolt assembly IV.

8. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 7 is characterized in that The cylinder is provided with an air inlet, a fixed installation hole, a piston rod connection hole and an exhaust port, wherein: The cylinder is mounted on the cylinder connecting frame through the fixed mounting hole, the cylinder mounting hole and the bolt assembly III; The piston rod connecting hole and the connecting column connect the cylinder and the displacement amplification module together through threaded connection.

9. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 7, characterized in that The front support is provided with a limited axis mounting hole II and a front support fixed mounting hole, wherein: The displacement amplification module is respectively mounted on the rear support and the front support through a fixed limit shaft, a limit shaft mounting hole I and a limit shaft mounting hole II1, and is axially limited by a retaining spring and a retaining spring groove of the support; The front support is mounted on the rear support through the front support fixing mounting hole, threaded hole I and screws.

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