A flow measurement device using friction nano-power generation

Abstract

The present application discloses a flow measurement device utilizing triboelectric nano-power generation, comprising: a first flow tube, a second flow tube, and a receiver; the first flow tube is used for allowing fluid to pass through, and the cross-sectional area of ​​the first flow tube along the direction of fluid flow changes periodically; the second flow tube abuts against the outer surface of the first flow tube; the first flow tube is made of readily available electronic material; and the second flow tube is made of volatile electronic material. When the fluid flows through the first flow tube, it exerts a periodically varying force on its inner wall, causing the first flow tube and the second flow tube to generate frictional electrification due to the strain difference caused by the different Young's moduli of the materials, thereby generating a periodic electrical signal, the period of which is related to the flow rate of the fluid. The receiver is connected to the second flow tube via an electrical signal lead wire, and is used to measure the period of the periodic electrical signal generated by the frictional electrification of the first flow tube and the second flow tube, and then calculate the flow rate of the fluid based on the period.

Description

Technical Field

[0001] The present application relates to the technical field of flow measurement devices, and in particular to a flow measurement device utilizing friction nano-power generation. Background Art

[0002] In the field of flow measurement, flowmeter is a relatively common flow measurement instrument. The most widely used ones are differential pressure flowmeter, ultrasonic flowmeter, vortex flowmeter and electromagnetic flowmeter. These flowmeters have the following characteristics:

[0003] A differential pressure flowmeter calculates flow based on known fluid conditions, the geometric dimensions of the detection element and the pipeline, and the pressure differential generated by the flow detection element. Its measurement accuracy is low, and during the measurement process, the instrument is easily worn due to installation and fluid impact, further reducing measurement accuracy.

[0004] Ultrasonic flowmeters measure flow by detecting the effect of fluid flow on ultrasonic beams. They have poor anti-interference capabilities and are susceptible to interference from bubbles, scaling, pumps, and other sources of ultrasonic noise. Furthermore, installation deviations and scaling in the measuring pipe can further introduce errors into flow measurement.

[0005] A vortex flowmeter is an instrument that measures fluid volume flow based on the Karman vortex principle. During measurement, the stability of the flowmeter's vortex separation is easily affected by velocity distribution distortion and rotating flow. High flow velocity impacts the channel fluid, causing additional vibration in the cantilever of the vortex generator, resulting in reduced measurement accuracy. This effect is more pronounced in large pipe diameters.

[0006] Electromagnetic flowmeters measure the flow of conductive fluids based on the electromotive force induced when the conductive fluid passes through an external magnetic field. Generally, they can only measure the liquid flow of conductive media but not the flow of non-conductive media, and have high requirements for the medium.

[0007] Existing patent application document CN111366203A discloses a dual-function triboelectric sensor and a dual-function test method for gas flow and liquid level height. In this patent application document, the gas flow and liquid level height are detected by the magnitude of the output voltage amplitude of the triboelectric nano-power generation sensor component. Since the voltage amplitude signal of triboelectric nano-power generation is easily affected by environmental factors such as temperature, pressure, and humidity, if the amplitude is relied upon to judge the flow size, it will cause large errors. Summary of the Invention

[0008] In view of this, the purpose of this application is to provide a flow measurement device using friction nanopower generation, which is used to solve the problem that existing flow meters cannot achieve high measurement accuracy, strong stability, low interference and high compatibility with different media.

[0009] To achieve the above technical objectives, the present application provides a flow measurement device using tribo-nanoelectric power generation, comprising: a first flow tube, a second flow tube, and a receiver;

[0010] The first flow tube is used for allowing fluid to pass through, and the cross-sectional area of ​​the first flow tube along the fluid flow direction changes periodically;

[0011] The second flow tube is sleeved on the first flow tube, and the inner surface of the second flow tube abuts against the outer surface of the first flow tube;

[0012] The first flow tube is made of readily available electronic material;

[0013] The second flow tube is made of volatile electronic material;

[0014] The first flow tube and the second flow tube have different Young's moduli;

[0015] When a fluid flows through the first flow tube, changes in the cross-sectional area of ​​the tube cause changes in the fluid's flow rate, subjecting the inner wall of the first flow tube to a periodically varying force. This, in turn, causes a periodic strain difference between the first and second flow tubes due to the difference in Young's modulus of the materials. Simultaneously, the strain difference between the first and second flow tubes causes frictional electrification, generating a periodic potential difference signal, the period of which is related to the fluid flow rate.

[0016] The receiver is used to measure the period of a periodic electric potential difference signal generated by frictional electrification due to the strain difference between the first flow tube and the second flow tube, and calculate the flow rate of the fluid according to the period of the electric signal.

[0017] Furthermore, the wall thickness of the first circulation tube and the second circulation tube are consistent.

[0018] Furthermore, the first flow tube is made of polytetrafluoroethylene.

[0019] Furthermore, the second flow tube is made of aluminum.

[0020] Furthermore, the cross-sections of the tube walls of the first circulation tube and the second circulation tube are both wavy.

[0021] Furthermore, it also includes a display;

[0022] The display is electrically connected to the receiver and is used to display the measurement result of the receiver.

[0023] It can be seen from the above technical solution that the present application provides a flow measurement device using friction nanopower generation, including: a first flow tube, a second flow tube and a receiver; the first flow tube is used for allowing fluid to pass through, and the cross-sectional area of ​​the first flow tube along the flow direction of the fluid changes periodically; the second flow tube is sleeved on the first flow tube, and the inner surface of the second flow tube abuts the outer surface of the first flow tube; the first flow tube is made of readily available electronic material; the second flow tube is made of volatile electronic material; the first flow tube and the second flow tube have different Young's moduli; the receiver and the second flow tube are connected by an electrical signal lead wire, which is used to measure the period of the periodic potential difference signal generated by frictional electrification due to the strain difference between the first flow tube and the second flow tube, and then calculate the flow rate of the fluid based on the period. As the fluid flows through the first flow tube, the changes in the internal cross-sectional area of ​​the tube cause the fluid's flow rate to vary periodically, subjecting the inner wall of the first flow tube to a periodic force. This force produces the same stress on the outer surface of the first flow tube and the inner surface of the second flow tube. However, due to the different Young's moduli of the two materials, a strain difference occurs. This strain difference causes triboelectric charging, which generates a periodic potential difference signal. Measuring the period of the electrical signal in this way, which determines the fluid flow rate, is more stable and reliable than traditional methods that measure the amplitude of the electrical signal, effectively improving measurement accuracy. It can measure a variety of fluid types and is less susceptible to interference from factors such as acoustic waves. This effectively solves the problem that existing flow meters cannot achieve high measurement accuracy, strong stability, interference resistance, and high compatibility with different media. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic diagram of a flow measurement device using tribo-nanoelectric power generation provided in an embodiment of the present application.

[0026] In the figure: 1. first flow tube; 2. second flow tube; 3. electrical signal lead wire. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection requested by this application.

[0028] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0030] See also Figure 1 In one embodiment of the present application, a flow measurement device utilizing triboelectric nanopower generation is provided, comprising: a first flow tube 1, a second flow tube 2, and a receiver (not shown). The first flow tube 1 is configured to allow fluid to pass through, and its cross-sectional area along the fluid flow direction varies periodically, i.e., its diameter varies periodically. The second flow tube 2 is sleeved onto the first flow tube 1, with its inner surface abutting against the outer surface of the first flow tube 1.

[0031] As the fluid flows through first flow tube 1, the periodic variations in tube diameter cause the fluid's flow rate to vary periodically, subjecting the inner wall of first flow tube 1 to a periodic force. Because the outer surface of first flow tube 1 and the inner surface of second flow tube 2 experience the same stress, but their materials have different Young's moduli, this stress produces different strains on each. This creates a periodic strain differential, leading to triboelectric charging.

[0032] Furthermore, in this embodiment, the first flow tube 1 is made of readily available electronic material; the second flow tube 2 is made of volatile electronic material; and the first flow tube 1 and the second flow tube 2 have different Young's moduli.

[0033] Due to their different Young's moduli, the first flow tube 1 and the second flow tube 2 will produce different strains under the action of fluid pressure, resulting in relative friction. At the same time, since the first flow tube 1 and the second flow tube 2 are respectively made of readily available electron materials and volatile electron materials, the relative friction between the two causes electrification, generating a periodic potential difference signal.

[0034] The receiver is connected to the second flow tube 2 via an electrical signal lead 3. This device measures the period of a periodic potential difference signal generated by frictional electrification due to the periodic strain difference between the first and second flow tubes 1 and 2, caused by the different Young's moduli of the materials. The receiver then calculates the fluid flow rate based on the period of this electrical signal. The electrical signal lead 3 outputs an analog-digital signal to the receiver, which then calculates the fluid flow rate based on the period of this analog-digital signal.

[0035] Specifically, the first flow tube 1 and the second flow tube 2 form a single-electrode triboelectric nanogenerator. By combining the combined effects of triboelectric charging and electrostatic induction, the generator can efficiently convert low-frequency mechanical energy, which is difficult to collect, into an electrical signal. After the second flow tube 2 is triboelectrically charged, the electrical signal is transmitted to a receiver via an electrical signal lead 3. The receiver outputs an analog-digital signal based on the electrical signal and calculates the fluid flow rate based on the periodicity of the signal. The flow measurement device using triboelectric nanogenerator provided in this embodiment can measure a variety of fluids. The device has a simple structure and offers advantages such as ease of manufacture, low cost, and high stability.

[0036] It should be noted that, in order to facilitate the staff to view the measurement results, a display may be provided, which is electrically connected to the receiver and is used to display the measurement results of the receiver.

[0037] In a more specific embodiment, the wall thickness of the first flow tube 1 and the second flow tube 2 is set to be consistent, which is beneficial for the two to cause the inner wall of the first flow tube to be subjected to a force when the fluid flow rate changes periodically, and to generate friction electrification due to periodic strain difference generated according to the different Young's moduli of the materials, so that the period of the measured electrical signal is more stable and reliable, which can effectively improve the measurement accuracy; compared with the traditional method of obtaining the fluid flow by measuring the amplitude of the electrical signal, the amplitude signal of friction nano-power generation is easily affected by environmental factors such as temperature, pressure, and humidity. If the flow rate is judged only by the amplitude, it will cause a large error.

[0038] In one embodiment, the first flow tube 1 may be made of polytetrafluoroethylene, which has the characteristics of being easily accessible to electrons and having good corrosion resistance, thereby being able to measure various types of fluids.

[0039] In another embodiment, the second flow tube 2 can be made of aluminum, which has strong conductivity and is easy to lose electrons, thereby facilitating frictional charging with the first flow tube 1.

[0040] As a further improvement, the cross-sections of the tube walls of the first flow tube 1 and the second flow tube 2 are both wavy, so that the flow velocity of the fluid can vary evenly and periodically after passing through, which is more conducive to measurement by the receiver.

[0041] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the aforementioned examples or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A flow measurement device using tribo-nanoelectricity generation, characterized in that: include: a first flow tube, a second flow tube, and a receiver; The first flow tube is used for allowing fluid to pass through, and the cross-sectional area of ​​the first flow tube along the fluid flow direction changes periodically; The second flow tube is sleeved on the first flow tube, and the inner surface of the second flow tube abuts against the outer surface of the first flow tube; The first flow tube is made of readily available electronic material; The second flow tube is made of volatile electronic material; The first flow tube and the second flow tube have different Young's moduli; The receiver is connected to the second flow tube via an electrical signal lead wire; When a fluid flows through the first flow tube, the change in the cross-sectional area of ​​the tube causes a change in the flow velocity of the fluid, causing the inner wall of the first flow tube to be subjected to a periodically changing force. This causes a periodic strain difference between the first flow tube and the second flow tube due to the difference in Young's modulus of the materials. Simultaneously, the first flow tube and the second flow tube are triboelectrically charged due to the strain difference, thereby generating a periodic potential difference signal. The period of the potential difference signal is related to the flow rate of the fluid. The receiver is used to measure the period of a periodic electric potential difference signal generated by frictional electrification due to the strain difference between the first flow tube and the second flow tube, and then calculate the flow rate of the fluid based on the period of the electric signal; The cross sections of the tube walls of the first circulation tube and the second circulation tube are both wavy.

2. The flow measurement device using tribo-nanoelectric power generation according to claim 1, characterized in that: The wall thickness of the first circulation tube and the second circulation tube are consistent.

3. The flow measurement device using tribo-nanoelectric power generation according to claim 1, characterized in that: The first flow tube is made of polytetrafluoroethylene.

4. The flow measurement device using tribo-nanoelectric power generation according to claim 1 or 3, characterized in that: The second flow tube is made of aluminum.

5. The flow measurement device using tribo-nanoelectric power generation according to claim 1, characterized in that: Also includes a display; The display is electrically connected to the receiver and is used to display the measurement result of the receiver.

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