Friction electricity self-driven liquid level detection device and detection method

Abstract

The invention provides a triboelectric self-driven liquid level detection device and method, and relates to the technical field of solution detection. The triboelectric self-driven liquid level detection device comprises a liquid level detection assembly, a signal processing assembly and a friction power generation assembly. The impeller is driven by mechanical energy generated by flowing of a solution to be detected to rotate so as to drive the friction power generation module to generate power, the friction power generation module supplies power to the liquid level detection assembly and the signal processing assembly, and the liquid level detection assembly detects the liquid level in the charging barrel and outputs an electric signal; receiving the electric signal output by the liquid level detection assembly through a signal processing assembly, and processing the electric signal to calculate the liquid level of the to-be-detected solution in the charging barrel; due to the fact that the detection device can generate electricity by itself and automatically detect the liquid level, the self-power-supply mode not only avoids tedious operation of frequently replacing a battery, but also enables the device to stably operate in a complex environment lacking an external power supply, and the application range of the device is greatly expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of solution detection, and particularly to a triboelectric self-driven liquid level detection device and a detection method. Background Art

[0002] With the continuous development of science and technology and the increasing social needs, liquid level detection devices have been widely used in many fields. Liquid level detection involves monitoring parameters such as liquid level changes and volume changes in liquid samples, and its applications cover many important fields such as the agricultural field, industrial production, medical diagnosis, and food safety.

[0003] Currently, the technologies of liquid level detection devices include traditional classic technologies such as the float method, pressure sensing method, and ultrasonic method, and also cover modern advanced means such as the capacitance method, laser method, and fiber optic sensing method. The detection methods used by these liquid level detection devices all require external battery or power supply. During the detection process, it may be necessary to frequently replace the battery or perform detection in an environment with power supply, which is not only cumbersome but also limits the usage scenarios. Summary of the Invention

[0004] The present invention provides a triboelectric self-driven liquid level detection device to solve the problems of cumbersome operation and limited usage scenarios in the prior art.

[0005] The present invention provides a triboelectric self-driven liquid level detection device, including: A liquid level detection component, arranged inside the material barrel, the liquid level detection component is used to detect the liquid level in the material barrel and output an electrical signal; A signal processing component, the signal processing component is electrically connected to the liquid level detection component, the signal processing component is used to receive the electrical signal output by the liquid level detection component and process the electrical signal to calculate the liquid level of the solution to be measured in the material barrel; A triboelectric power generation component, the triboelectric power generation component includes: A triboelectric power generation module; An impeller, the impeller is rotatably arranged in the liquid delivery pipeline communicated with the material barrel, the triboelectric power generation module is connected to the impeller through a connecting rod, the triboelectric power generation module is electrically connected to the liquid level detection component and the signal processing component, the impeller is used to rotate under the drive of the mechanical energy generated by the flow of the solution to be measured to drive the triboelectric power generation module to generate electricity, and the triboelectric power generation module is used to supply power to the liquid level detection component and the signal processing component.

[0006] According to a triboelectric self-driven liquid level detection device provided by the present invention, the liquid level detection component includes: A transmitter; A receiver, wherein the transmitter and the receiver are oppositely arranged on the inner wall of the cartridge, the transmitter and the receiver are both electrically connected to the triboelectric power generation module, the transmitter is used to send an electrical signal, and the receiver is used to receive the electrical signal sent by the transmitter.

[0007] According to a triboelectric self-driven liquid level detection device provided by the present invention, the transmitter is a sheet-shaped transmitter, and the transmitter and the receiver are both vertically arranged.

[0008] According to a triboelectric self-driven liquid level detection device provided by the present invention, it further includes: A first three-way pipe, which is connected in series to the infusion pipe through a first interface and a second interface.

[0009] According to a triboelectric self-driven liquid level detection device provided by the present invention, the triboelectric power generation component includes: A housing, which is arranged at the third interface of the first three-way pipe; A static energy friction layer, which is arranged inside the housing; A kinetic energy friction layer, which is connected to the end of the connecting rod far from the impeller, and the kinetic energy friction layer is used to generate electricity by friction with the static energy friction layer under the drive of the impeller.

[0010] According to a triboelectric self-driven liquid level detection device provided by the present invention, the static energy friction layer includes: A substrate, which is connected to the housing; Multiple copper foils, which are arranged at intervals in the circumferential direction on the side of the substrate facing the kinetic energy friction layer, and a charge-loss film is arranged on the side of the copper foil facing the kinetic energy friction layer.

[0011] According to a triboelectric self-driven liquid level detection device provided by the present invention, the kinetic energy friction layer is animal hair.

[0012] According to a triboelectric self-driven liquid level detection device provided by the present invention, it further includes: An energy collection component, which is electrically connected to the triboelectric power generation module, the liquid level detection component and the signal processing component, and the energy collection component is used to store electric energy and supply power to the liquid level detection component and the signal processing component.

[0013] According to a triboelectric self-driven liquid level detection device provided by the present invention, the signal processing component includes: A signal amplification unit, which is electrically connected to the liquid level detection component, and the signal amplification unit is used to amplify the electrical signal output by the liquid level detection component; A filtering unit, electrically connected to the signal amplification unit, for removing noise and interference from the electrical signal; An analog-to-digital conversion unit, electrically connected to the filtering unit, for converting the electrical signal into a digital signal.

[0014] The present invention also provides a triboelectric self-powered liquid level detection method, which is based on the triboelectric self-powered liquid level detection device described in any one of the above, and includes: When the liquid level rises, more nodes of the receiver are covered by the solution, and the signal intensity or frequency received by the receiver also changes accordingly. The liquid level of the solution can be calculated according to the capacitance which can be calculated according to the following formula (1); where, (1) where, represents the relative permittivity of the medium, represents the permittivity of vacuum of the medium, represents the area of the emitter covered by the solution, represents the distance between the emitter and the receiver.

[0015] The triboelectric self-powered liquid level detection device provided by the present invention is driven by the mechanical energy generated by the flow of the solution to be measured through the impeller to rotate, so as to drive the triboelectric power generation module to generate electricity. The triboelectric power generation module supplies power to the liquid level detection component and the signal processing component. The liquid level detection component detects the liquid level in the barrel and outputs an electrical signal. The signal processing component receives the electrical signal output by the liquid level detection component and processes the electrical signal to calculate the liquid level of the solution to be measured in the barrel. Since the detection device can generate electricity by itself and automatically detect the liquid level, this self-power supply mode not only eliminates the cumbersome operation of frequently replacing batteries, but also enables the device to operate stably in complex environments lacking external power sources, greatly expanding its application range. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of the triboelectric self-powered liquid level detection device provided by the present invention.

[0018] Figure 2 is a schematic structural diagram of the barrel provided by the present invention.

[0019] Figure 3 It is a schematic side sectional structure view of the barrel provided by the present invention.

[0020] Figure 4 It is a schematic side sectional structure view of the triboelectric power generation component provided by the present invention.

[0021] Figure 5 It is a schematic working principle view of the triboelectric self-driven liquid level detection device provided by the present invention.

[0022] Reference numerals: 10. Barrel; 11. Infusion pipeline; 12. Transmitter; 13. Receiver; 14. First three-way pipeline; 20. Signal processing component; 30. Triboelectric power generation component; 31. Impeller; 32. Connecting rod; 33. Housing; 35. Kinetic friction layer; 36. Substrate; 38. Electric loss film; 40. Energy collection component. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0026] In an embodiment of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0027] In the description of this specification, the descriptions with reference to the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0028] As Figure 1 shown, the triboelectric self-powered liquid level detection device includes a liquid level detection component, a signal processing component 20, and a triboelectric power generation component 30. The liquid level detection component is disposed inside the cartridge 10. The liquid level detection component is used to detect the liquid level in the cartridge 10 and output an electrical signal. The signal processing component 20 is electrically connected to the liquid level detection component. The signal processing component 20 is used to receive the electrical signal output by the liquid level detection component and process the electrical signal to calculate the liquid level of the solution to be measured in the cartridge 10. The triboelectric power generation component 30 includes a triboelectric power generation module and an impeller 31. The impeller 31 is rotatably disposed in the infusion pipeline 11 communicating with the cartridge 10. The triboelectric power generation module is connected to the impeller 31 through a connecting rod 32. The triboelectric power generation module is electrically connected to the liquid level detection component and the signal processing component 20. The impeller 31 is used to rotate driven by the mechanical energy generated by the flow of the solution to be measured to drive the triboelectric power generation module to generate electricity. The triboelectric power generation module is used to supply power to the liquid level detection component and the signal processing component 20.

[0029] The triboelectric self-driven liquid level detection device provided by the present invention rotates under the drive of the impeller 31 generated by the flow of the solution to be tested, so as to drive the triboelectric power generation module to generate electricity, and the triboelectric power generation module is used to power the liquid level detection component and the signal processing component 20, and the liquid level in the barrel 10 is detected by the liquid level detection component, and an electrical signal is output; the electrical signal output by the liquid level detection component is received by the signal processing component 20, and the electrical signal is processed to calculate the liquid level of the solution to be tested in the barrel 10; since the detection device can generate electricity by itself and automatically detect the liquid level, this self-powered mode not only eliminates the tedious operation of frequently replacing batteries, but also enables the device to operate stably in complex environments without external power supplies, greatly expanding its application range.

[0030] The triboelectric self-driven liquid level detection device provided by the present invention has successfully broken through many limitations of traditional liquid level detection devices in usage scenarios by virtue of its unique self-generating function and automated detection capability. It does not need to rely on an external power supply or frequent battery replacement, which enables the device to have broader application prospects in complex scenarios such as remote areas, field environments, and underwater operations. For example, in agricultural irrigation systems, the device can be easily installed in canals or water tanks to monitor water level changes in real time and achieve precise irrigation; in the field of industrial production, for liquid level monitoring of large liquid storage tanks, chemical reactors and other equipment, the device can effectively reduce maintenance costs and improve production efficiency; in scientific research fields such as environmental monitoring and hydrological research, its self-powered characteristics enable the device to operate stably for a long time at unmanned field monitoring sites, providing strong support for the collection of scientific research data.

[0031] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the liquid level detection assembly includes a transmitter 12 and a receiver 13, and the transmitter 12 and the receiver 13 are relatively arranged on the inner wall of the barrel 10 so that the electrical signal emitted by the transmitter 12 is received by the receiver 13 after passing through the solution to be tested. The transmitter 12 is a sheet-shaped transmitter 12, and preferably, the transmitter 12 is embedded in the inner wall of the barrel 10. The transmitter 12 and the receiver 13 are both arranged vertically, and the receiver 13 has a plurality of nodes along the vertical direction, and these nodes will gradually be covered or exposed by the solution when the liquid level changes. As the liquid level rises, more nodes on the receiver 13 will be covered by the solution, and this process will cause the signal strength or frequency received by the receiver 13 to change accordingly, thereby realizing accurate monitoring of the liquid level change. The transmitter 12 and the receiver 13 are both electrically connected to the friction power generation module through wires, and the transmitter 12 is used to send electrical signals, and the receiver 13 is used to receive the electrical signals sent by the transmitter 12.

[0032] In one embodiment of the present invention, Figure 1As shown, the triboelectric self-driven liquid level detection device further includes a first three-way pipe 14. The first three-way pipe 14 is connected in series to the infusion pipe 11 through a first interface and a second interface. The impeller 31 is inside the first three-way pipe 14. Arranging the first three-way pipe 14 on the infusion pipe 11 facilitates the installation of the triboelectric power generation module and simplifies the assembly method.

[0033] In an embodiment of the present invention, as Figure 4 shown, the triboelectric power generation assembly 30 includes a housing 33, a static energy friction layer, and a kinetic energy friction layer 35. The housing 33 is arranged at the third interface of the first three-way pipe 14. The housing 33 is made of plastic or other insulating materials. The housing 33 is adhesively connected or hot melt welded to the third interface of the first three-way pipe 14. The housing 33 provides an installation basis for the static energy friction layer, and the static energy friction layer is arranged inside the housing 33.

[0034] The static energy friction layer is adhesively connected to the housing 33. Of course, the connection method between the static energy friction layer and the housing 33 is not limited to this, and other connection methods such as snap connection can also be used for connection.

[0035] The static energy friction layer has a circular sheet structure. A through hole is provided in the center of the static energy friction layer. One end of the connecting rod 32 away from the impeller 31 passes through the through hole, and the connecting rod 32 can rotate axially relative to the static energy friction layer. The kinetic energy friction layer 35 has a circular sheet structure. The kinetic energy friction layer 35 is arranged on one side of the static energy friction layer. The kinetic energy friction layer 35 is connected to one end of the connecting rod 32 away from the impeller 31. The kinetic energy friction layer 35 is welded or integrally formed with one end of the connecting rod 32 away from the impeller 31. The kinetic energy friction layer 35 is used to generate electricity by friction with the static energy friction layer under the drive of the impeller 31.

[0036] Preferably, the housing is provided with an opening, and a cover is provided at the opening. The cover is threadedly connected or snap connected to the housing 33. Arranging the cover facilitates the installation, disassembly, and maintenance of the static energy friction layer and the kinetic energy friction layer 35.

[0037] Preferably, sealing rings are provided between the cover and the housing 33 and between the connecting rod 32 and the static energy friction layer. Arranging the sealing rings can prevent external water vapor from entering the inside of the housing 33 and affecting the triboelectric power generation.

[0038] In an embodiment of the present invention, as Figure 4As shown, the static friction layer includes a substrate 36 and a plurality of copper foils. The substrate 36 has a circular sheet structure. The substrate 36 is adhesively connected or snap-connected to the outer shell 33. Both of these connection methods can ensure that the substrate 36 is stably fixed inside the outer shell 33 during operation, avoiding displacement or loosening caused by vibration or friction. Preferably, an annular step is provided on the inner wall of the outer shell 33, and the substrate 36 is fixed on the annular step. The provision of the annular step can increase the contact area between the substrate 36 and the outer shell 33, thereby improving the stability of the substrate 36, ensuring that the substrate 36 will not become loose or deformed during long-term use, and guaranteeing the stability and reliability of triboelectric power generation.

[0039] The copper foils are fan-shaped thin sheets. The copper foils can be replaced by other metal thin sheets. A plurality of copper foils are arranged at intervals in the circumferential direction on the side of the substrate 36 facing the kinetic friction layer 35. The copper foils are adhesively connected to the substrate 36 to ensure close fitting between the copper foils and the substrate 36 and guarantee the effective transmission of electric energy. The shapes and sizes of two adjacent copper foils are the same. Of course, the shapes and sizes of two adjacent copper foils can also be different, which are specifically determined according to actual needs. The distance between two adjacent copper foils is a fixed value. Welding points are provided on both of the two adjacent copper foils. These two welding points are the positive contact point and the negative contact point respectively. The positive contact point and the negative contact point are respectively connected to the energy collection component 40 through wires. A charge-loss film 38 is provided on the side of the copper foil facing the kinetic friction layer 35. The shape of the charge-loss film 38 is the same as that of the copper foil. The charge-loss material film is used to contact the kinetic friction sheet and generate electron transfer.

[0040] Preferably, a disc is provided at one end of the connecting rod 32 away from the impeller 31. The kinetic friction layer 35 is adhesively connected to the disc. The provision of the disc can increase the contact area between the kinetic friction layer 35 and the connecting rod 32, improve the stability of the kinetic friction layer 35, and prevent the kinetic friction layer 35 from falling off during the friction process with the charge-loss film 38. The kinetic friction layer 35 is animal hair. Of course, the material of the kinetic friction layer 35 is not limited thereto, and it can also be materials such as polytetrafluoroethylene, polyethylene, or nylon. During the rotation of the connecting rod 32, the connecting rod 32 drives the animal hair to rub against the charge-loss film 38. Electron transfer occurs when the animal hair rubs against the charge-loss material, and the electric energy is transmitted to the energy collection component 40 through the contact points on the copper foil and the wires.

[0041] In an embodiment of the present invention, as Figure 1 shown, the triboelectric self-powered liquid level detection device further includes an energy collection component 40. The energy collection component 40 is electrically connected to the triboelectric power generation module, the liquid level detection component, and the signal processing component 20. The energy collection component 40 is used to store electric energy and supply power to the liquid level detection component and the signal processing component 20. Specifically, the energy collection component 40 is a supercapacitor or a micro battery.

[0042] Since the current output by the triboelectric power generation module is affected by the flow rate of the solution, the current stability is poor. The energy harvesting component 40 enables the components to work together to achieve the overall function of the device. The energy harvesting component 40 plays a role in regulating, distributing, and controlling electrical energy to ensure that different modules obtain stable power support in their respective working states. For example, when the liquid level detection component or the signal processing component 20 is in a low-power consumption state or stops working, the electrical energy generated by the triboelectric power generation module will be efficiently stored in the energy harvesting component 40. This not only avoids waste of electrical energy but also provides the necessary energy reserve for subsequent high-power consumption working states. When the liquid level detection component or the signal processing component 20 is in a working state with high energy consumption, the energy harvesting component 40 can release the stored electrical energy in a timely manner to output a stable current for the liquid level detection component. This function of storing and regulating electrical energy effectively balances the energy consumption requirements of the entire device and ensures the stable operation of the liquid level detection component or the signal processing component 20 in different working states.

[0043] In an embodiment of the present invention, the signal processing component 20 includes a signal amplification unit, a filtering unit, and an analog-to-digital conversion unit. The signal amplification unit is electrically connected to the liquid level detection component, and the signal amplification unit is used to amplify the electrical signal output by the liquid level detection component. The main function of the signal amplification unit is to effectively amplify the weak electrical signal output by the liquid level detection component. During the liquid level detection process, due to the signal transmission between the transmitter 12 and the receiver 13 may be affected by various factors, such as the conductivity of the solution, the rate of liquid level change, and environmental noise, etc., resulting in the output electrical signal being weak and unstable. The signal amplification unit can amplify these weak electrical signals to an amplitude sufficient for subsequent processing by using a high-gain, low-noise amplification circuit. This not only increases the signal strength but also enhances the signal stability, enabling the subsequent filtering and analog-to-digital conversion processes to be carried out more accurately.

[0044] The filtering unit is electrically connected to the signal amplification unit, and the filtering unit is used to remove noise and interference from the electrical signal. The filtering unit can effectively separate these noise and interference components from the electrical signal by using appropriate filtering circuits, such as low-pass filters, band-pass filters, etc. The signal after filtering is smoother and more stable, providing a high-quality analog signal for subsequent analog-to-digital conversion, thereby improving the accuracy of liquid level calculation.

[0045] The analog-to-digital conversion unit is electrically connected to the filtering unit, and the analog-to-digital conversion unit is used to convert the electrical signal into a digital signal. The analog-to-digital conversion unit can accurately convert the continuous change of the analog signal into a digital signal by using a high-resolution, high-precision analog-to-digital converter, which is convenient for digital devices such as microcontrollers and computers to process.

[0046] In an embodiment of the present invention, such asFigure 1 As shown in Figure 1 , the triboelectric self-driven liquid level detection device further includes two second three-way pipes, which are connected in series to the infusion pipe 11 through the first interface and the second interface. The third interfaces of the two second three-way pipes are both in a closed state, and the signal processing component 20 and the energy harvesting component 40 are respectively installed at the third interfaces of the two second three-way pipes.

[0047] To facilitate the understanding of the working principle of the triboelectric self-driven liquid level detection device, the electronegative film 38 is a PTFE film, and the kinetic friction layer 35 is rabbit hair for illustration.

[0048] As Figure 5 shown in Figure 5 , the process of triboelectric production is divided into 4 stages. In the first stage, when the PTFE film and the rabbit hair are completely overlapped and in contact, due to triboelectrification, at the contact surface, the PTFE film and the rabbit hair will carry equal amounts of charges with opposite signs. Because the electronegativity of the PTFE film is higher than that of the rabbit hair, the PTFE film can adsorb the electrons on the surface of the rabbit hair when rubbing and thus carry negative charges. Similarly, the rabbit hair carries positive charges because it loses electrons.

[0049] In the second stage, when the rabbit hair rotates relative to the PTFE film, the PTFE film and the rabbit hair are not completely overlapped and a potential difference is generated between the two electrodes. The rabbit hair has a relatively high induced potential, which will drive electrons to flow from the copper foil through the external circuit to the rabbit hair, generating a downward current.

[0050] In the third stage, the PTFE film and the copper foil are just completely separated. At this time, since the PTFE film is an insulator, it still retains the negative charges on its surface.

[0051] In the fourth stage, when the upper rabbit hair continues to rotate and starts to slowly overlap with the lower PTFE film. Friction will also cause the potential difference between the two electrodes to slowly decrease, so electrons will return to the copper foil through the external circuit in the opposite direction to before. Therefore, in the continuous rotation of the two electrodes of the PTFE film and the copper foil, the upper and lower two electrodes are constantly overlapped and separated, generating a periodic AC signal of positive and negative currents.

[0052] The present invention also provides a triboelectric self-driven liquid level detection method. The detection method is based on the triboelectric self-driven liquid level detection device described in any one of the above embodiments, and includes: When the liquid level rises, more nodes of the receiver 13 are covered by the solution, and the signal intensity or frequency received by the receiver 13 also changes accordingly. The liquid level of the solution can be calculated according to the capacitance which can be calculated according to the following formula (1); The capacitance (1) where represents the relative permittivity of the medium, represents the permittivity of free space of the medium, represents the area of the emitter 12 covered by the solution, represents the distance between the emitter 12 and the receiver 13.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A triboelectric self-driven liquid level detection device, characterized in that Comprising: A liquid level detection component, disposed inside the barrel (10), the liquid level detection component being configured to detect the liquid level inside the barrel (10) and output an electrical signal; A signal processing component (20), the signal processing component (20) being electrically connected to the liquid level detection component, the signal processing component (20) being configured to receive the electrical signal output by the liquid level detection component and process the electrical signal to calculate the liquid level of the solution to be measured inside the barrel (10); A triboelectric power generation component (30), the triboelectric power generation component (30) comprising: A triboelectric power generation module; An impeller (31), the impeller (31) being rotatably disposed inside an infusion pipeline (11) communicating with the barrel (10), the triboelectric power generation module being connected to the impeller (31) through a connecting rod (32), the triboelectric power generation module being electrically connected to the liquid level detection component and the signal processing component (20), the impeller (31) being configured to rotate under the drive of the mechanical energy generated by the flow of the solution to be measured to drive the triboelectric power generation module to generate electricity, and the triboelectric power generation module being configured to supply power to the liquid level detection component and the signal processing component (20).

2. The triboelectric self-driven liquid level detection device according to claim 1, wherein, The liquid level detection component comprises: A transmitter (12); A receiver (13), the transmitter (12) and the receiver (13) being oppositely disposed on the inner wall of the barrel (10), the transmitter (12) and the receiver (13) both being electrically connected to the triboelectric power generation module, the transmitter (12) being configured to send an electrical signal, and the receiver (13) being configured to receive the electrical signal sent by the transmitter (12).

3. The triboelectric self-driven liquid level detection device according to claim 2, wherein, The transmitter (12) is a sheet-shaped transmitter (12), and the transmitter (12) and the receiver (13) are both vertically disposed.

4. The triboelectric self-driven liquid level detection device according to any one of claims 1 to 3, characterized in that, Further comprising: A first three-way pipeline (14), the first three-way pipeline (14) being connected in series to the infusion pipeline (11) through a first interface and a second interface.

5. The triboelectric self-driven liquid level detection device according to claim 4, wherein The triboelectric power generation component (30) comprises: A housing (33), the housing (33) being disposed at a third interface of the first three-way pipeline (14); A static energy friction layer, the static energy friction layer being disposed inside the housing (33); A kinetic energy friction layer (35), the kinetic energy friction layer (35) being connected to an end of the connecting rod (32) far from the impeller (31), the kinetic energy friction layer (35) being configured to frictionally generate electricity with the static energy friction layer under the drive of the impeller (31).

6. The triboelectric self-driven liquid level detection device according to claim 5, wherein, The static energy friction layer comprises: A substrate (36), the substrate (36) being connected to the housing (33); A plurality of copper foils, the plurality of copper foils being circumferentially spaced apart and disposed on a side of the substrate (36) facing the kinetic energy friction layer (35), and a charge-loss film (38) being disposed on a side of the copper foil facing the kinetic energy friction layer (35).

7. The triboelectric self-driven liquid level detection device according to claim 6, wherein, The kinetic energy friction layer (35) is animal hair.

8. The triboelectric self-driven liquid level detection device according to any one of claims 1 to 3, characterized in that, Further comprising: An energy harvesting component (40), the energy harvesting component (40) being electrically connected to the triboelectric power generation module, the liquid level detection component, and the signal processing component (20), the energy harvesting component (40) being configured to store electrical energy and supply power to the liquid level detection component and the signal processing component (20).

9. The triboelectric self-driven liquid level detection device according to any one of claims 1 to 3, characterized in that The signal processing component (20) includes: A signal amplification unit, the signal amplification unit being electrically connected to the liquid level detection component, the signal amplification unit being configured to amplify the electrical signal output by the liquid level detection component; A filtering unit, the filtering unit being electrically connected to the signal amplification unit, the filtering unit being configured to remove noise and interference from the electrical signal; An analog-to-digital conversion unit, the analog-to-digital conversion unit being electrically connected to the filtering unit, the analog-to-digital conversion unit being configured to convert the electrical signal into a digital signal.

10. A triboelectric self-driven liquid level detection method, the detection method being based on the triboelectric self-driven liquid level detection device according to any one of claims 1 to 9, characterized in that, including: When the liquid level rises, more nodes of the receiver (13) are covered by the solution, and the signal strength or frequency received by the receiver (13) also changes accordingly. The liquid level of the solution can be calculated according to the capacitance for calculation, and the capacitance can be calculated according to the following formula (1); （1） Among them, represents the relative permittivity of the medium, represents the permittivity of vacuum of the medium, represents the area of the emitter covered by the solution, represents the distance between the emitter and the receiver.

Images