CN106357155B - Towards the porous grid stimulable type piezoelectric generator of staged of low energy-consumption electronic device energy supply - Google Patents

Abstract

The invention discloses a stepped porous grid excitation piezoelectric generator for energy supply of low power consumption devices to solve the problems of low energy capture power and low efficiency in the gas direct impact piezoelectric generator in the industrial production environment . The invention is composed of three parts: a stepped micropore flow increasing device, a grid-excited piezoelectric generating device and a set screw. The stepped micropore flow increasing device amplifies the flow and velocity of the high-pressure and small-flow gas, and acts on the piezoelectric generating element of the grid-excited piezoelectric generating device to realize energy capture. The invention has the function of amplifying the gas flow, and utilizes the amplified flow to collect piezoelectric energy, significantly improves the power of the piezoelectric generator, and can increase the energy harvesting efficiency of the piezoelectric generator by more than three times. The full-bridge rectifier circuit can continuously and effectively supply energy to low-power electronic devices, and has broad application prospects in the fields of low-power electronic devices, Internet of Things nodes, and low-power sensor energy supply technologies.

Description

A stepped porous grid-excited piezoelectric generator for powering low-power devices

technical field

The invention relates to a stepped porous grid excitation piezoelectric generator for energy supply of low-power devices, and belongs to the technical field of energy supply for low-power electronic equipment.

Background technique

With the continuous improvement of the intelligence level of manufacturing equipment technology and its deep integration with Internet of Things technology, a large number of low-power devices such as Internet of Things nodes have been widely used in the field of machinery manufacturing equipment. At present, stable and reliable continuous power supply to IoT nodes is a prerequisite for ensuring the normal operation of low-power devices such as IoT nodes. At present, the energy supply methods of low-power devices such as Internet of Things nodes in the field of machinery manufacturing mainly include direct power supply and chemical battery power supply. Among them, the direct power supply method leads to serious electromagnetic interference and complicated system wiring, while the chemical battery power supply method has disadvantages such as limited battery life, regular replacement, and environmental pollution. Therefore, it is necessary to study a new energy supply technology for power supply of low-power devices such as IoT nodes to solve many disadvantages caused by traditional energy supply technologies.

The environmental energy harvesting technology, which uses the positive piezoelectric effect of piezoelectric materials to capture environmental micro-energy and convert it into electrical energy, has become a micro-energy conversion and supply technology due to its advantages such as high energy conversion efficiency, clean and pollution-free, free from electromagnetic interference, and long service life. technology research hotspots. Gas kinetic energy is a form of energy that exists in large quantities in industrial production, and it also has the advantages of being safe, clean and renewable. Therefore, rational use of gas energy in the industrial production environment, combined with the positive piezoelectric effect of piezoelectric materials to convert gas energy into electrical energy for low-power devices such as wireless Internet of Things nodes, can effectively solve the wiring problems caused by traditional power supply. Complexity and the problems of regular replacement and environmental pollution brought about by battery power supply will promote the improvement of the intelligent level of industrial manufacturing equipment technology. Traditional piezoelectric generators generally use high-pressure gas in industrial environments to directly impact piezoelectric generators to capture electrical energy, which makes traditional gas-impact piezoelectric generators have the problems of small energy capture power and low efficiency, which limits the potential of piezoelectric generators. Development and application in the field of energy supply technology for low-power electronic equipment.

Contents of the invention

In order to solve the technical problems of low energy capture power and low efficiency in existing piezoelectric generators when high-pressure gas directly impacts piezoelectric generators to capture electric energy, the present invention discloses a stepped porous grid for energy supply to low-power devices. The excited piezoelectric generator provides a high-power and high-efficiency energy supply device for low-power devices.

The technical scheme adopted in the present invention is:

The stepped porous grid-excited piezoelectric generator for energy supply to low-power devices consists of three parts: a stepped micropore flow increasing device, a grid-excited piezoelectric power generation device and a set screw, wherein the stepped micropore The flow increasing device and the grid-excited piezoelectric power generation device are threadedly connected through set screws; the stepped micropore flow increasing device is provided with a conical suction end, a conical gas outlet, a threaded connection hole at the flow increasing end, and a supply port. Air hole, first-level micro-jet hole, second-level micro-jet hole and retaining ring; the grid-excited piezoelectric power generation device includes a fixed support for power generation and a piezoelectric power generation assembly, a fixed support for power generation and a step-type micropore flow increase The unit is threaded with set screws.

The stepped micropore flow increasing device is provided with a conical suction end and a tapered gas outlet, the threaded connection hole of the flow increasing end is close to the tapered gas outlet, and the threaded connection hole of the flow increasing end is threadedly connected with a set screw, The first-level micro-jet hole and the second-level micro-jet hole are located in the middle of the stepped micro-pore flow increasing device, and a retaining ring is arranged between the first-level micro-jet hole and the second-level micro-jet hole, and the air supply hole is close to the second-level micro-jet hole.

The power generation fixed support is provided with a threaded connection hole at the power generation end, a substrate fixing groove, a fixed connection hole and an exhaust hole. It is placed at the end of the fixed support for power generation, and the exhaust hole is placed on the outer surface of the fixed support for power generation.

The piezoelectric power generation component is composed of a piezoelectric power generation substrate and a piezoelectric power generation element; the piezoelectric power generation substrate is provided with a piezoelectric element fixing groove and an excitation grid; The threaded connection hole of the flow increasing end on the flow increasing device is used for thread connection; the piezoelectric power generation component can be inserted into the fixing groove of the substrate to fix the position; the piezoelectric power generation substrate has a piezoelectric element fixing groove to fix the position of the piezoelectric power generating element .

The beneficial effects of the present invention are: without affecting the working conditions of industrial production, the invented stepped micropore flow increasing device is used to amplify the flow rate of small flow high-pressure gas, and the amplified flow is sprayed out through the conical gas outlet end to excite the grid The vibration-excited piezoelectric power generation device makes the internal piezoelectric power generation components produce bending deformation to achieve the effect of energy collection and electric energy conversion by amplifying the airflow, which can significantly increase the power of the piezoelectric power generation device and increase the energy capture efficiency by more than 3 times. The invention has the effect of amplifying gas flow by using high-pressure and low-flow gas, and has the technical advantage of fully utilizing the amplified flow to collect piezoelectric energy, and has broad application prospects in the technical field of energy supply for low-power electronic equipment.

Description of drawings

Fig. 1 shows the structure schematic diagram of the ladder-type porous grid excitation type piezoelectric generator for energy supply of low-power devices proposed by the present invention;

Fig. 2 shows the cross-sectional view of the stepped micropore flow increasing device proposed by the present invention;

Fig. 3 shows the sectional view of the conical suction end of the stepped micropore flow increasing device proposed by the present invention;

Fig. 4 shows the cross-sectional view of the tapered gas outlet end of the stepped micropore flow increasing device proposed by the present invention;

Fig. 5 is a schematic structural diagram of a grid-excited piezoelectric generator proposed by the present invention;

Figure 6 is a cross-sectional view of the structure of the fixed support for power generation proposed by the present invention;

Figure 7 is a partial view of the fixed support for power generation proposed by the present invention;

Figure 8 is a cross-sectional view of the piezoelectric power generation assembly proposed by the present invention;

Fig. 9 is a schematic structural diagram of the piezoelectric power generation substrate proposed by the present invention;

FIG. 10 is a schematic diagram of a full-bridge rectifier circuit proposed by the present invention.

Detailed ways

This embodiment will be described with reference to FIGS. 1 to 10 . This implementation mode provides a specific implementation scheme of a stepped porous grid excitation piezoelectric generator for energy supply of low power consumption devices. The stepped porous grid-excited piezoelectric generator for energy supply to low-power devices is composed of three parts: a stepped micropore flow increasing device 1, a grid-excited piezoelectric generator 2 and a set screw 3, wherein The step-type micropore flow increasing device 1 has threaded connection holes 1-3 at the flow-increasing end, which are threaded with the threaded connection holes 2-1-1 at the power generation end on the grid-excited piezoelectric power generation device 2 through set screws 3 .

The conical suction end 1-1 is located at the suction end of the stepped micropore flow increasing device 1, the conical gas outlet end 1-2 is located at the gas outlet end of the stepped micropore flow increasing device 1, and the screw connection hole of the flow increasing end is 1-3 is close to the tapered air outlet end 1-2, the threaded connection hole 1-3 of the flow-increasing end is threadedly connected with the set screw 3, the first-level micro-jet hole 1-5 and the second-level micro-jet hole 1-6 Located in the middle of the stepped micropore flow increasing device 1, a stop ring 1-7 is provided between the first-level micro-jet holes 1-5 and the second-level micro-jet holes 1-6, and the stop ring 1-7 can block the first-level micro-jet holes 1-5 and secondary micro-jet holes 1-6, the air supply hole 1-4 is close to the secondary micro-jet hole 1-6, and the high-pressure gas enters the primary micro-jet hole 1-5 through the gas supply hole 1-4 at the same time and secondary micro-jet holes 1-6, the mixed gas composed of induced gas and high-pressure gas conducts primary air energy amplification through primary micro-jet holes 1-5, and performs secondary acceleration through secondary micro-jet holes 1-6. The accelerated mixed gas is sprayed out of the stepped micropore flow increasing device 1 through the tapered gas outlet 1-2.

The grid-excited piezoelectric power generation device 2 includes a power generation fixed support 2-1 and a piezoelectric power generation component 2-2; Base plate fixing groove 2-1-2, fixing connection hole 2-1-3 and exhaust hole 2-1-4, the threaded connection hole 2-1-1 of the power generation end and the stepped micropore flow increasing device 1 are tightly fixed The screw 3 is threaded, the fixed connection hole 2-1-3 is placed at the end of the power generation fixed support 2-1, and the exhaust hole 2-1-4 is placed on the outer surface of the power generation fixed support 2-1.

The piezoelectric power generation component 2-2 is composed of a piezoelectric power generation substrate 2-2-1 and a piezoelectric power generation element 2-2-2; the piezoelectric power generation substrate 2-2-1 is provided with a piezoelectric element fixing groove 2- 2-1-1 and the excitation grid 2-2-1-2; the threaded connection hole 2-1-1 of the power generation end can be connected with the threaded connection hole of the flow-increasing end on the stepped micropore flow-enhancing device 1 through the set screw 3 Threaded connection; the piezoelectric power generation component 2-2 can be inserted into the substrate fixing groove 2-1-2 to fix the position; the piezoelectric power generation substrate 2-2-1 has a piezoelectric element fixing groove 2-2-1-1 The position of the piezoelectric generating element 2-2-2 can be fixed. The airflow enters the grid-excited piezoelectric power generation device 2 through the stepped micropore flow increasing device 1. When the airflow passes through the pores formed by the piezoelectric power generation element 2-2-2 and the excitation grid 2-2-1-2 It will induce vibration in the air to drive the deformation of the piezoelectric generating element 2-2-2, and use the positive piezoelectric effect to promote the piezoelectric generating element 2-2-2 to convert the kinetic energy of the gas into electrical energy. The full-bridge rectifier circuit can continuously and effectively serve Powering low-power electronics.

The maximum diameter of the conical suction end _1-1 is D1, and the value _of D1 satisfies the range of 60-80 mm. By adjusting the value of D1, the intake velocity _of the induced gas can be adjusted. This specific implementation _In the mode, the value of D1 is 60 mm, the cone angle of the conical suction end 1-1 is θ, and the value of θ satisfies the range of 0° to 60°, and the induced gas flow rate can be adjusted by adjusting the value of θ. Intake speed, the value of θ in this specific embodiment is 20°; the minimum diameter of the tapered air outlet 1-2 is D ₂ , and the ratio of D ₂ to D ₁ is G=D ₂ /D ₁ , G The value of α satisfies the range of 0.4~0.8, and the value of G in this specific embodiment is 0.8; the cone angle of the tapered gas outlet 1-2 is α, and the value of α satisfies the range of 0~20° , the flow velocity of the mixed gas can be adjusted by adjusting the value of α, the value of α in this specific embodiment is 15°; the diameter of the air supply holes 1-4 is D ₃ , and the ratio of D ₃ to D ₁ is F=D ₃ /D ₁ , the value of F satisfies the range of 0.02~0.1, and the value of F in this specific embodiment is 0.1; the linear distance between the center of the air supply hole 1-4 and the conical suction end 1-1 is L ₁ , the value of L ₁ satisfies the range of 10-25 mm, and the value of L ₁ in this specific embodiment is 15 mm; the linear distance between the center of the air supply hole 1-4 and the tapered air outlet end 1-2 is L ₂ , the ratio of L ₁ to L ₂ is J=L ₁ /L ₂ , the value of J satisfies the range of 0.2~0.5, and the value of J in this specific embodiment is 0.3; the first-stage microjet _The diameter of holes 1-5 is D4, and the value of D4 satisfies the range of 40-60 mm. _In this specific embodiment, the value of D4 is 50 mm. _The primary micro-jet holes 1-5 and two The center distance between the micro jet holes 1-6 is L ₃ , the ratio of D ₄ to L ₃ is Z=D ₄ /L ₃ , and the value of Z satisfies the range of 2~5. In this embodiment, Z The value of is 2.

The ratio of the width A of the piezoelectric power generation substrate 2-2-1 in the piezoelectric power generation assembly 2-2 in the grid-excited piezoelectric power generation device 2 to the width B of the substrate fixing groove 2-1-2 A/B is between 0.85~0.95; the ratio c/b of the width c of the piezoelectric generating element 2-2-2 to the width b of the excitation grid 2-2-1-2 is between 0.7~0.9 ; The exhaust hole 2-1-4 is placed on the upper and lower surfaces of the power generation fixed support 2-1.

The piezoelectric power generation element 2-2-2 in the grid-excited piezoelectric power generation device 2 is selected from a piezoelectric ceramic sheet PZT or a flexible and tough piezoelectric material PVDF, and the piezoelectric power generation element 2-2-2 It can be a piezoelectric material product of Precision Electronics (Shenzhen) Co., Ltd. of the United States.

The full-bridge rectifier circuit is composed of diode D ₆ , diode D ₇ , diode D ₈ , diode D ₉ and capacitor C ₁ . When the flow-increasing gas flows out from the tapered gas outlet 1-2, the grid-excited piezoelectric power generation device 2 will be excited, and under the action of the positive piezoelectric effect, an electric signal with alternating positive and negative periodic changes will be generated. The electrical signal is connected to the input terminal of the full-bridge rectifier circuit through wires. When a positive electric signal is generated, diode D6 and diode _D9 are turned _on to form a closed loop, and electric energy can be stored in capacitor _C1 ; when a negative electric signal is generated, diode _D7 and diode _D8 are turned on to form a closed loop , and the flow direction of the rectified electrical signal is the same as the flow direction of the closed loop electrical signal of the diode D ₆ and the diode D ₉ , so the electric energy is still stored in the capacitor C ₁ . The rectified and stored electric energy can flow out to the low power consumption device at the output end via _C1 for power supply. The diodes (D ₆ ~D ₉ ) may be NI5408 rectifier diodes, and the capacitance of the capacitor C ₁ ranges from 100 to 1000 μF.

Working principle: The positive piezoelectric effect of the piezoelectric material can convert the impact energy of the gas into electrical energy. The stepped porous grid excitation piezoelectric generator designed in the present invention for energy supply to low-power devices can operate at low flow rates and high pressures. Under the action of gas, the external air is induced to flow in a directional manner. Based on the influence of the viscous force between the hole wall and the gas, the induced external air can be accelerated. The grid-excited piezoelectric power generation device connected with the pore flow increasing device converts electric energy. The step-type micro-pore flow increasing device can accelerate the high-pressure gas at an extremely fast speed for a second time, thereby effectively improving the effect of increasing the flow. The technical advantage of the grid-excited piezoelectric power generation device is that there is a small gap between the piezoelectric power generation element and the excitation grid, which will cause vibration when high-speed gas passes through the gap, and the piezoelectric power generation element will move the gas under the influence of vibration. Conversion of energy into electricity. Therefore, the grid-excited piezoelectric power generation device can make full use of the increased gas flow rate of the stepped micropore flow increasing device to convert gas energy into electrical energy.

Based on the above, the present invention designs a stepped porous grid excitation piezoelectric generator for energy supply to low-power devices, which can amplify the gas flow and collect piezoelectric energy from the gas with the amplified flow, which can significantly improve The power of the piezoelectric generator and the energy harvesting efficiency are increased by more than 3 times. The full-bridge rectifier circuit can continuously and effectively supply energy for low-power electronic equipment, which can promote the improvement of the intelligent level of industrial manufacturing equipment technology.

Claims (4)

1. a kind of porous grid stimulable type piezoelectric generator of staged towards low energy-consumption electronic device energy supply, the piezoelectric generator is by rank Ladder type micropore flow-increasing device（1）, grid excitation type piezoelectric generating device（2）And holding screw（3）Three parts form, its scala media Ladder type micropore flow-increasing device（1）With grid excitation type piezoelectric generating device（2）Pass through holding screw（3）It is threadedly coupled； Staged micropore flow-increasing device（1）It is provided with circular cone type suction end（1-1）, taper outlet side（1-2）, flow increasing end screw thread Connecting hole（1-3）, air vent（1-4）, one-level miniature jet hole（1-5）, two level miniature jet hole（1-6）And baffle ring（1-7）；Institute The grid excitation type piezoelectric generating device stated（2）Including generating hold-down support（2-1）With piezo-electric generating component（2-2）, generate electricity solid Determine bearing（2-1）With staged micropore flow-increasing device（1）Pass through holding screw（3）It is threadedly coupled；It is characterized in that：Institute State staged micropore flow-increasing device（1）It is provided with circular cone type suction end（1-1）With taper outlet side（1-2）, the flow increasing end Threaded connection hole（1-3）Close to taper outlet side（1-2）, flow increasing end threaded connection hole（1-3）With holding screw（3）Screw thread Connection, the one-level miniature jet hole（1-5）With two level miniature jet hole（1-6）Positioned at staged micropore flow-increasing device（1） Middle part, one-level miniature jet hole（1-5）With two level miniature jet hole（1-6）Between be provided with baffle ring（1-7）, the air vent （1-4）Close to two level miniature jet hole（1-6）；The generating hold-down support（2-1）It is provided with generating end threaded connection hole（2- 1-1）, substrate fixed groove（2-1-2）, fixedly connected hole（2-1-3）And steam vent（2-1-4）, generating end threaded connection hole（2- 1-1）With staged micropore flow-increasing device（1）Pass through holding screw（3）It is threadedly coupled, fixedly connected hole（2-1-3）Put In generating hold-down support（2-1）End, steam vent（2-1-4）It is placed in generating hold-down support（2-1）Outer surface；The piezoelectricity Electrification component（2-2）By piezo-electric generating substrate（2-2-1）With piezo-electric generating element（2-2-2）Composition；Piezo-electric generating substrate（2-2- 1）It is provided with piezoelectric element fixed groove（2-2-1-1）With exciting grid（2-2-1-2）；Generating end threaded connection hole（2-1-1） Holding screw can be passed through（3）With staged micropore flow-increasing device（1）On flow increasing end threaded connection hole（1-3）Carry out screw thread company Connect；Piezo-electric generating component（2-2）It can be inserted into substrate fixed groove（2-1-2）Position is carried out to fix；Piezo-electric generating substrate（2-2-1） With piezoelectric element fixed groove（2-2-1-1）Can be to piezo-electric generating element（2-2-2）Position is carried out to fix.

A kind of 2. porous grid stimulable type piezo-electric generating of staged towards low energy-consumption electronic device energy supply according to claim 1 Machine, it is characterised in that the circular cone type suction end（1-1）Maximum gauge be D₁, D₁Value meet scope be 60 ~ 80 mm； The taper outlet side（1-2）Cone angle be α, the scope that α value meets is 0 ~ 20 °；Described air vent（1-4）It is a diameter of D₃, D₃With D₁Ratio be F=D₃/D₁, the scope that F value meets is 0.02 ~ 0.1；The air vent（1-4）Center and circular cone Formula suction end（1-1）Air line distance be L₁, L₁Value meet scope be 10 ~ 25 mm；The air vent（1-4）Center with Taper outlet side（1-2）Air line distance is L₂, L₁With L₂Ratio be J=L₁/L₂, the scope that J value meets is 0.2 ~ 0.5；Institute State one-level miniature jet hole（1-5）Aperture be D₄, D₄Value meet scope be 40 ~ 60 mm.

A kind of 3. porous grid stimulable type piezo-electric generating of staged towards low energy-consumption electronic device energy supply according to claim 1 Machine, it is characterised in that the piezo-electric generating component（2-2）Piezo-electric generating substrate（2-2-1）Width A and substrate fixed groove （2-1-2）Width B ratios A/B between 0.85 ~ 0.95；Piezo-electric generating element（2-2-2）Width c and exciting grid （2-2-1-2）Width b ratio c/b between 0.7 ~ 0.9.

A kind of 4. porous grid stimulable type piezo-electric generating of staged towards low energy-consumption electronic device energy supply according to claim 1 Machine, it is characterised in that piezo-electric generating component（2-2）In piezo-electric generating element（2-2-2）From piezoelectric ceramic piece PZT or flexibility Obdurability piezoelectric PVDF.