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

Abstract

The application discloses a PVDF gas pressure energy converter based on a connecting rod displacement amplification module, and the energy converter 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 gas cylinder, a clasp spring and a front support, wherein 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 the bolt assembly II, and the other end is installed on the rear support assembly and the front support through the clasp spring respectively; the gas cylinder is installed on the rear support assembly through the bolt assembly III and is connected with the connecting rod displacement amplification module; and the front support is installed on the rear support assembly. The converter can improve the electric energy output of the PVDF piezoelectric material, make the PVDF piezoelectric material generate greater strain deformation in a limited space, and promote the wireless development of the low-power-consumption sensor electric energy supply of a pneumatic system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of energy collection and relates to an energy converter, in particular to a PVDF pneumatic energy converter based on a connecting rod displacement amplification mechanism. BACKGROUND

[0002] The pneumatic system is widely used in manufacturing plants in various industries as an important means to realize production automation due to its advantages of large energy density, wide power source, no pollution, fast reaction and high reliability. However, the industrial field environment is complex and harsh, such as high vibration, high electromagnetic radiation and high noise, and the time uncertainty of the occurrence of field device failures makes it difficult for workers to monitor the running status (such as flow, pressure, etc.) of various pneumatic elements and environmental parameters (such as temperature, humidity, etc.) in the industrial field. In addition, due to the mobility of the industrial field equipment, if a traditional wired cable is used for data transmission, the layout and wiring are complex, which consumes a lot of manpower, material resources and financial resources, and has poor scalability and mobility, high installation cost and poor monitoring effect. If a battery is used for power supply, the battery must be replaced at regular intervals, and these components and devices often work for a long time without interruption, so frequent battery replacement will inevitably increase the cost and bring inconvenience.

[0003] As a new energy collection technology, the piezoelectric energy harvester has the advantages of simple structure, high energy density, no electromagnetic interference, no heating, easy integration, etc., and has become a research hotspot in the field of kinetic energy collection and self-powered wireless sensor nodes. Therefore, using piezoelectric energy collection technology to convert the pressure energy of the pneumatic system into electrical energy to meet the power supply needs of low-power sensors can solve the energy supply problem of low-power wireless nodes in the pneumatic system. Generally speaking, the materials of piezoelectric energy harvesters can be divided into PZT piezoelectric ceramics and PVDF piezoelectric polymers. PZT has large piezoelectric constant and good piezoelectric performance, but it is not flexible and is easily broken, and cannot withstand large external forces. On the contrary, PVDF piezoelectric material has good flexibility and durability, but the key problem restricting its application is the insufficient electrical energy output, and its good piezoelectric performance usually depends on large strain deformation. SUMMARY

[0004] In order to solve the technical problems of traditional piezoelectric energy harvesters that have large output electrical energy but poor durability and are easily broken, and have good durability but small output electrical energy, the present application provides a PVDF pneumatic energy converter based on a connecting rod displacement amplification module. The converter can improve the electrical energy output of PVDF piezoelectric material, make it produce greater strain deformation in a limited space, and promote the wireless development of the electrical energy supply of low-power sensors in the pneumatic system.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A PVDF pneumatic energy converter based on a connecting rod displacement amplification module, comprising 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 pneumatic cylinder, a snap spring and a front support, wherein:

[0007] The PVDF piezoelectric unit is installed on the hinge through the bolt assembly I;

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

[0009] The pneumatic cylinder is installed on the rear support assembly through the bolt assembly III and connected with the connecting rod displacement amplification module;

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

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

[0012] 1、The present application selects a PVDF piezoelectric material with better flexibility, adopts a pure bending deformation mode with two-end hinge constraint, and designs a connecting rod displacement amplification module, so that the PVDF piezoelectric material is subjected to greater and more uniform strain change during bending deformation, greatly improving the electric energy output of the PVDF piezoelectric material, while ensuring the durability and high-performance electric energy output.

[0013] 2、The pneumatic energy converter of the present application is suitable for multiple PVDF piezoelectric units to work simultaneously to further increase the electric energy output of the pneumatic energy converter.

[0014] 3、The present application adopts a stacking parallel connection mode and increases a gap between adjacent PVDF piezoelectric units, which saves space volume while increasing the output electric energy of the multiple PVDF piezoelectric units during bending deformation, better promotes the development of wireless and miniaturization of low-power consumption wireless sensor power supply in the pneumatic system, and meets the power supply demand of low-power consumption sensors. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the PVDF pneumatic 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 It is a schematic diagram of the structure of the elastic substrate;

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

[0019] Figure 5 Figure 1 is a schematic diagram of a connecting rod displacement amplification module structure;

[0020] Figure 6 Figure 2 is a schematic diagram of a rotating frame structure;

[0021] Figure 7 Figure 3 is a schematic diagram of a flat pin shaft structure;

[0022] Figure 8 Figure 4 is a schematic diagram of an amplification swing lever structure;

[0023] Figure 9 Figure 5 is a schematic diagram of a fixed limiting shaft structure;

[0024] Figure 10 Figure 6 is a schematic diagram of a connecting rod structure;

[0025] Figure 11 Figure 7 is a schematic diagram of an intermediate moving shaft structure;

[0026] Figure 12 Figure 8 is a schematic diagram of an intermediate connecting block structure;

[0027] Figure 13 Figure 9 is a schematic diagram of a rear support assembly structure;

[0028] Figure 14 Figure 10 is a schematic diagram of a rear support structure;

[0029] Figure 15 Figure 11 is a schematic diagram of a cylinder connecting frame structure;

[0030] Figure 16 Figure 12 is a schematic diagram of a cylinder structure;

[0031] Figure 17 Figure 13 is a schematic diagram of a front support structure;

[0032] Figure 18 Figure 14 is a schematic diagram of the working principle of a PVDF gas pressure energy converter based on a connecting rod displacement amplification module. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are further described below in conjunction with the drawings, but are not limited thereto, and any modification or equivalent replacement of the technical solutions of the present application without departing from the spirit and scope of the present application shall be covered in the protection scope of the present application.

[0034] The present application provides a PVDF gas pressure energy converter based on a connecting rod displacement amplification module, as shown in Figure 1As shown, the air pressure energy converter comprises a PVDF piezoelectric unit 1, a bolt assembly I 2, a partition pad 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, an air cylinder 9, a screw 10, a clasp spring 11 and a front support 12, wherein:

[0035] The PVDF piezoelectric unit 1 is installed on the hinge 4 through the bolt assembly I 2, and a plurality of PVDF piezoelectric units 1 are spaced apart by a partition pad 3;

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

[0037] The air cylinder 9 is installed on the rear support assembly 7 through the bolt assembly III 8 and connected with the connecting rod displacement amplification module 6 through screw connection;

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

[0039] As shown in the figure, Figures 2-3 The PVDF piezoelectric unit 1 comprises 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, wherein:

[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, and the double-sided conductive tape 1-2 serves as both a tape and 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 as another conductive electrode of the PVDF piezoelectric unit 1;

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

[0043] The PVDF piezoelectric unit 1 is provided with n, 2<n<10, PVDF piezoelectric units 1, which are stacked together in parallel, to form a plurality of piezoelectric energy harvesting units, wherein: a partition pad 3 with a thickness of h, 0.5mm<h<10mm, is arranged between adjacent PVDF piezoelectric units 1 to separate the plurality of PVDF piezoelectric units 1, so that adjacent PVDF piezoelectric units 1 do not affect each other when they are bent and deformed, and the bending and deformation is more sufficient.

[0044] As shown in the figure, 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, the positions and center distances of which correspond to the substrate connection holes 1-1-1, and 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] As shown, Figures 5-12 The connecting rod displacement amplification module 6 includes a rotating frame 6-1, a flat pin shaft 6-2, an amplification swing rod 6-3, a fixed limiting 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 shaft 6-2 is provided with a pin shaft snap spring groove 6-2-1;

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

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

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

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

[0054] The intermediate moving shaft 6-7 is provided with link spring groove 6-7-1 and link limiting shaft shoulder 6-7-2, and the link spring groove 6-7-1 and the link 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 connecting column 6-8-1 and moving shaft mounting hole 6-8-2;

[0056] The rotating frame connecting hole I 6-1-1 is symmetrically distributed on the top surface of the rotating frame 6-1, and the position corresponds to the hinge connecting hole II 4-2, which is used for connecting with the hinge 4;

[0057] The rotating frame connecting hole II 6-1-2 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 amplifying swing lever 6-3 through the rotating frame connecting hole II 6-1-2, the rotating frame connecting hole III 6-3-1 and the flat head pin shaft 6-2, and is limited through the cooperation of the snap spring 11 and the pin shaft spring groove 6-2-1;

[0059] The limiting groove 6-1-3 limits the rotation angle of the rotating frame 6-1 when the amplifying swing lever 6-3 swings through the cooperation of the limiting column 6-3-4, so that the direction of the rotating frame connecting hole I 6-1-1 always remains upward;

[0060] The amplifying swing lever 6-3 is installed on the swing lever limiting shaft shoulder 6-4-3 at both ends of the fixed limiting shaft 6-4 through the fixed limiting shaft connecting hole 6-3-2, and is limited through the cooperation of the snap spring 11 and the amplifying swing lever spring groove 6-4-2;

[0061] The link connecting hole I 6-3-3 and the link connecting hole II 6-6-1 connect the amplifying swing lever 6-3, the tension spring 6-5 and the link 6-6 together through the flat head pin shaft 6-2 and the snap 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 mounting hole 6-8-2;

[0063] The link 6-6 is installed on the link limiting shaft shoulder 6-7-2 of the intermediate moving shaft 6-7 through the link connecting hole II 6-6-1, and is limited through the snap spring 11 and the link spring groove 6-7-1.

[0064] As Figures 13-15 The rear support assembly 7 includes a rear support 7-1, a cylinder connecting frame 7-2 and a bolt assembly IV 7-3, wherein:

[0065] The rear support 7-1 is provided with a cylinder connecting frame mounting hole 7-1-1, a limiting 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] As shown in Figure 16 The cylinder 9 is provided with an air inlet 9-1, a fixed mounting hole 9-2, a piston rod connecting hole 9-3 and an exhaust port 9-4, wherein:

[0069] The cylinder 9 is installed 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 are connected together by thread connection.

[0071] As shown in Figure 17 The front support 12 is provided with a limiting shaft mounting hole II12-1 and a front support fixed mounting hole 12-2, wherein:

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

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

[0074] Working principle:

[0075] As shown in Figure 18As shown, the application is based on a connecting rod displacement amplification module, which uses the positive piezoelectric effect of piezoelectric materials to convert the pressure energy in the pneumatic system into large strain bending deformation of the PVDF piezoelectric unit 1, and more efficiently extracts the piezoelectric energy of the PVDF piezoelectric unit 1. The specific process is: when the gas enters the rodless cavity 102 of the cylinder 9 through the 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 tension, the amplification swing rod 6-3 swings inward, and then the small longitudinal displacement of the piston rod is converted into large horizontal displacement bending deformation of the PVDF piezoelectric unit 1 connected with the hinge 4, and the electric energy generated by the PVDF piezoelectric unit is increased. The excess gas in the rod cavity 100 of the cylinder 9 is discharged to the atmosphere through the exhaust hole 9-4. When no gas enters the rodless cavity 102 of the cylinder 9, the piston rod 101 moves upward under the dual action of the stretching force of the tension spring 6-5 and the elastic force of the PVDF piezoelectric unit 1 itself, the tension spring 6-5 returns to its original length, the amplification 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 by the reversing valve in the pneumatic system flows into the inlet 9-1, the PVDF piezoelectric unit 1 will undergo periodic large strain bending deformation and generate electric 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, retaining 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 a retaining ring; 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; 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; There are n PVDF piezoelectric units, 2 < n < 10. The n PVDF piezoelectric units are connected in parallel and stacked together in sequence 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; 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; The link displacement amplification module includes a rotating frame, flat head pin, 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 is provided with a pin retaining 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 retaining ring groove, an amplification swing rod retaining ring groove, and a swing rod limit shoulder. The support retaining ring groove, the amplification swing rod retaining 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 retaining ring groove and a link limit shoulder. The link retaining ring groove and the link limit shoulder are symmetrically distributed in pairs at both ends of the intermediate moving shaft; The intermediate connecting block is provided with a connecting column and a movable shaft mounting hole; The turret connection holes I are symmetrically distributed on the top surface of the turret, and their positions correspond to the hinge connection holes II, and are used to connect to the hinge; The rotating frame connection hole II and the limiting groove are symmetrically distributed on both sides of the rotating frame; The turret is mounted on the amplified rocker arm through turret connection hole II, turret connection hole III and the flat-head pin, and is limited by the cooperation of the retaining spring and the retaining spring groove of the pin; The limiting groove cooperates with the limiting post to limit the rotation angle of the rotating frame when the swing arm swings, so that the direction of the rotating frame connecting hole I always remains upward; The amplifying rocker arm is installed on the rocker arm 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 amplifying rocker arm; The connecting rod connecting hole I and the connecting rod connecting hole II connect the amplifying rocker arm, 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 movable shaft through the connecting rod connecting hole II, and is limited by the retaining ring and the connecting rod retaining ring groove.

2. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 1 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 is n / m.

3. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 1 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.

4. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 3 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.

5. The PVDF air pressure energy converter based on the connecting rod displacement amplification module according to claim 3 is characterized in that The front support is provided with a limit 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 limiting shaft, limiting shaft mounting hole I and limiting shaft mounting hole II, 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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