Liquid flow rate measurement method

Abstract

This invention relates to the field of liquid flow rate measurement technology and discloses a method for measuring liquid flow rate. The liquid flow rate measuring device includes a main body, a reference electrode, a pulse power supply module, a measuring module, and multiple sensing electrodes. The main body is an n-shaped plate. The reference electrode is located on one outer side of the n-shaped plate, and the multiple sensing electrodes are located on the other outer side of the n-shaped plate. The multiple sensing electrodes are electrically connected to the positive terminal of the pulse power supply module, and the reference electrode is electrically connected to the negative terminal of the pulse power supply module. The measuring module is used to synchronously monitor the voltage of each of the multiple sensing electrodes relative to the negative terminal of the pulse power supply module. This invention solves the problem that existing flow rate measurements using rotary cup / propeller flowmeters are prone to foreign object entanglement and affect water flow, leading to low measurement accuracy. The n-shaped plate, immersed in the liquid, minimizes the impact on liquid flow rate, thereby improving the accuracy of liquid flow rate measurement.

Description

Technical Field

[0001] This invention relates to the field of liquid flow rate measurement technology, and in particular to a method for measuring liquid flow rate. Background Technology

[0002] Urban drainage pipe networks, buried underground, represent a significant challenge and pain point in drainage system management. Monitoring the sewage flow velocity within these networks allows for a degree of diagnosis of their operational status and pollution levels, providing data support for decision-making regarding repair and renovation.

[0003] Currently, the most commonly used flow velocity measurement devices are cup / propeller flow meters. The principle of a cup / propeller flow meter is that when water flows onto the instrument's sensing element (a cup or propeller), the water flow drives the sensing element to rotate, and the rotational speed of the sensing element is converted into an electrical pulse signal, which is then transmitted to a counter. However, due to the mechanical rotating structure, foreign matter can easily become entangled when there are floating or suspended particles in the liquid. Furthermore, the cup / propeller affects the water flow, resulting in low accuracy of the measurement results.

[0004] Therefore, there is an urgent need to develop a new flow velocity measurement device that is convenient for use in drainage pipe networks. Summary of the Invention

[0005] To address the problems of existing flow velocity measurements using rotary cup / propeller flowmeters, which are prone to foreign object entanglement and affect water flow, resulting in low measurement accuracy, this invention provides a liquid flow velocity measurement method.

[0006] To address the aforementioned problems, this invention provides a liquid flow rate measuring device. The device includes a main body, a reference electrode, a pulse power supply module, a measuring module, and multiple sensing electrodes. The main body is an n-shaped plate. The reference electrode is disposed on one outer side of the n-shaped plate, and the multiple sensing electrodes are disposed on the other outer side of the n-shaped plate. The multiple sensing electrodes are electrically connected to the positive terminal of the pulse power supply module, and the reference electrode is electrically connected to the negative terminal of the pulse power supply module. The measuring module is used to synchronously monitor the voltage of each of the multiple sensing electrodes relative to the negative terminal of the pulse power supply module.

[0007] Optionally, the pulse power supply module includes a DC power supply and a multi-channel synchronous controllable switch. The number of control loops of the multi-channel synchronous controllable switch is equal to the number of sensing electrodes. The multiple sensing electrodes are electrically connected to the control loops of the multi-channel synchronous controllable switch in a one-to-one correspondence. The multi-channel synchronous controllable switch is electrically connected to the positive terminal of the DC power supply, and the reference electrode is electrically connected to the negative terminal of the DC power supply.

[0008] Optionally, the liquid flow rate measuring device further includes a plurality of amplifying resistors, the number of which is equal to the number of sensing electrodes, each amplifying resistor corresponding to a sensing electrode and each amplifying resistor corresponding to a control circuit of the multi-channel synchronous controllable switch; one end of each amplifying resistor is electrically connected to a sensing electrode, and the other end of each amplifying resistor is electrically connected to the multi-channel synchronous controllable switch.

[0009] Optionally, the sampling frequency of the measurement module is greater than or equal to 10 kHz.

[0010] Optionally, the frequency of the multi-channel synchronous controllable switch closing and opening is 10Hz~100Hz; and the equivalent internal resistance of the multi-channel synchronous controllable switch in the open state is greater than 1GΩ.

[0011] Optionally, the output voltage of the DC power supply is 5V~10V.

[0012] Optionally, the reference electrode is a metal sheet coated with an insulating and waterproof material.

[0013] Optionally, the sensing electrode is a metal sheet coated with an insulating and waterproof material, and multiple sensing electrodes are arranged side by side at equal intervals.

[0014] Optionally, the edges of the n-shaped plate are smoothly transitioned by an arc surface.

[0015] To address the aforementioned problems, this invention also provides a liquid flow rate measurement method. The method uses the aforementioned liquid flow rate measuring device to measure the liquid flow rate, and includes the following steps:

[0016] In an immersion environment where both the plane of the reference electrode and the plane of the sensing electrode are parallel to the direction of liquid flow, the control pulse power supply module generates waveform pulse voltages of multiple cycles.

[0017] The voltage of each of the multiple sensing electrodes in the circuit monitored by the measurement module relative to the negative terminal of the pulse power supply module is recorded to obtain a voltage sampling array U;

[0018] Calculate the fall time t for each voltage path. N The difference in fall time ΔT between the voltage and the first voltage path;

[0019] The liquid flow rate corresponding to the descent time difference ΔT is determined based on the descent time difference ΔT and the flow rate-descent time difference relationship table; the flow rate-descent time difference relationship table is a pre-measured mapping table used to indicate the mapping relationship between the liquid flow rate and the descent time difference;

[0020] In this model, the first sensing electrode at the water source is designated as the first path, and the paths increase sequentially according to the direction of liquid flow. N represents the number of sensing electrodes, and the voltage sampling array is U = [U1, U2, U3, ..., U...]. N ], and U k = [uk1, uk2, uk3,…, ukn] (k =1, 2, 3,…, N), U N ukn represents the voltage of the last induction electrode at the end of the water flow; ukn represents the sampled value of the k-th voltage at the nth sampling time; the voltage fall time T = [t1, t2, t3, ..., t] N ], t N This represents the voltage drop time of the last induction electrode at the end of the water flow. The drop time is the average time required for the voltage to drop to 10% of its original value from the moment the pulse power supply module is disconnected. The drop time difference ΔT = [Δt1, Δt2, Δt3,…, Δt] N ], Δt k = t k - t1(k = 1, 2, 3,…, N).

[0021] Compared with the prior art, the liquid flow rate measurement method provided in this embodiment of the invention has the following advantages:

[0022] 1. In the liquid flow velocity measuring device provided in this embodiment of the invention, the main body of the device is an n-shaped plate. A reference electrode is disposed on one outer side of the n-shaped plate, and multiple sensing electrodes are disposed on the other outer side of the n-shaped plate. The multiple sensing electrodes are electrically connected to the positive terminal of the pulse power supply module, and the reference electrode is electrically connected to the negative terminal of the pulse power supply module. The measuring module is used to synchronously monitor the voltage of each of the multiple sensing electrodes relative to the negative terminal of the pulse power supply module. By immersing the reference electrode and multiple sensing electrodes on the n-shaped plate as the acquisition components in the liquid, the device has a simple structure and solves the problem that existing flow velocity measurements using rotary cup / propeller flowmeters are prone to foreign object entanglement and affect water flow, resulting in low measurement accuracy. The n-shaped plate immersed in the liquid can minimize the impact on the liquid flow velocity, thereby improving the measurement accuracy of the liquid flow velocity.

[0023] Furthermore, the liquid flow rate measuring device of this invention only requires immersing the n-shaped plate in the liquid during use. Then, based on the cooperation of the pulse power module and the measuring module, the voltage of each of the multiple sensing electrodes relative to the negative terminal of the pulse power module is obtained, and the liquid flow rate is calculated. This allows for simple and quick measurement and obtaining of the liquid flow rate, thus improving the measurement rate of liquid flow rate.

[0024] Furthermore, the liquid flow rate measuring device of this invention does not require rotating parts, resulting in low hardware costs.

[0025] 2. In the liquid flow rate measuring device provided in this embodiment of the invention, the pulse power supply module includes a DC power supply and a multi-channel synchronous controllable switch. The control circuit of the multi-channel synchronous controllable switch is equal in number to the number of sensing electrodes and is electrically connected in a one-to-one correspondence. The multi-channel synchronous controllable switch is electrically connected to the positive terminal of the DC power supply, and the reference electrode is electrically connected to the negative terminal of the DC power supply. Through the cooperation of the DC power supply and the multi-channel synchronous controllable switch, multiple cycles of waveform pulse voltage are generated, thereby enabling the measuring module to obtain the voltage of each sensing electrode relative to the negative terminal of the DC power supply in its respective circuit, achieving simple and rapid measurement and obtaining the liquid flow rate result.

[0026] 3. In the liquid flow rate measuring device provided in this embodiment of the invention, the liquid flow rate measuring device further includes multiple amplifying resistors. The number of amplifying resistors is equal to that of the sensing electrodes and they are connected in series in a one-to-one correspondence. One end of the amplifying resistor is electrically connected to the sensing electrode, and the other end of the amplifying resistor is electrically connected to a multi-channel synchronous controllable switch. By connecting an amplifying resistor in series in each control loop, an amplified voltage drop signal can be formed, which is beneficial for calculating the voltage drop time of each subsequent control loop.

[0027] 4. In the liquid flow rate measuring device provided in the embodiments of the present invention, by limiting the sampling frequency of the measuring module to be greater than or equal to 10kHz, the sampling interval time can be shortened, the sampling data obtained per unit time can be increased, and the accuracy of the signal waveform can be improved.

[0028] 5. In the liquid flow rate measuring device provided in this embodiment of the invention, the reference electrode is a metal sheet coated with insulating and waterproof material, which can prevent liquid from wetting the reference electrode, avoid current leakage, and improve the safety of the liquid flow rate measuring device.

[0029] 6. In the liquid flow rate measuring device provided in this embodiment of the invention, the sensing electrode is a metal sheet with an insulating and waterproof material coated on its surface, which can prevent liquid from wetting the sensing electrode, avoid current leakage, and improve the safety of the liquid flow rate measuring device.

[0030] In addition, the arrangement of multiple sensing electrodes at equal intervals in parallel can improve measurement accuracy.

[0031] 7. In the liquid flow rate measuring device provided in the embodiments of the present invention, since the n-shaped plate itself is a flat plate and the edge is smoothly transitioned by the arc surface, when the n-shaped plate is immersed in the liquid, the water-facing surface can be smoothly processed, which basically does not affect the liquid flow rate, thereby improving the measurement accuracy of the liquid flow rate.

[0032] 8. This invention also provides a liquid flow rate measurement method, which has the same function as the liquid flow rate measurement device described above, and will not be repeated here.

[0033] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the functional modules of the liquid flow rate measuring device provided in the first embodiment of the present invention;

[0036] Figure 2 A three-dimensional structural schematic diagram of the acquisition component of the liquid flow velocity measuring device provided in the first embodiment of the present invention;

[0037] Figure 3 A three-dimensional structural diagram showing the connection between the main body and the reference electrode of the liquid flow velocity measuring device provided in the first embodiment of the present invention;

[0038] Figure 4 A three-dimensional structural diagram showing the connection between the main body and the sensing electrode of the liquid flow velocity measuring device provided in the first embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the circuit principle of the liquid flow rate measuring device provided in the first embodiment of the present invention;

[0040] Figure 6 This is a schematic flowchart of a liquid flow rate measurement method provided in the second embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of the pulse voltage generated by the pulse power supply module provided in the second embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of the voltage drop time provided in the second embodiment of the present invention.

[0043] Figure 9 This is a schematic diagram of the liquid flow rate measuring device provided in the third embodiment of the present invention.

[0044] Explanation of reference numerals in the attached diagram:

[0045] 1. Liquid flow rate measuring device;

[0046] 11. Acquisition component; 12. Measurement component;

[0047] 111. Main body of the device; 112. Reference electrode; 113. Sensing electrode; 121. Pulse power supply module; 122. Measurement module; 123. Amplification resistor;

[0048] 1211 DC power supply; 1212 Multi-channel synchronous controllable switch. Detailed Implementation

[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the system claims may also be implemented by a single unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0051] It should be noted that the terms "first," "second," "third," and "fourth," etc., in the specification and claims of this invention are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, in embodiments of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0052] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0053] Example 1

[0054] Please see Figure 1As shown, this embodiment of the invention provides a liquid flow rate measuring device 1, which includes a data acquisition component 11 and a measurement component 12. The data acquisition component 11 and the measurement component 12 are electrically connected. The data acquisition component 11 is used to collect information by immersing itself in the liquid, and the measurement component 12 is used to calculate the flow rate of the liquid.

[0055] Please combine Figures 2-4 As shown, the acquisition component 11 includes a device body 111, a reference electrode 112 and a plurality of sensing electrodes 113. The device body 111 is an n-shaped plate with two outer sides parallel to each other. The reference electrode 112 is disposed on one outer side of the n-shaped plate, and the plurality of sensing electrodes 113 are disposed on the other outer side of the n-shaped plate.

[0056] Specifically, the main body 111 is made of resin. The surface of the main body 111 is coated with a low liquid viscosity coefficient material, such as water or alcohol, which can reduce the impact on the liquid flow rate.

[0057] Specifically, the reference electrode 112 is embedded in the center of the outer side of the main body 111 of the device. The reference electrode 112 is a metal sheet with an insulating and waterproof material coated on its surface, which can prevent liquid from wetting the reference electrode 112, avoid current leakage, and improve the safety of the liquid flow rate measuring device 1.

[0058] Specifically, multiple sensing electrodes 113 are arranged side by side at equal intervals, which can improve measurement accuracy. The sensing electrodes 113 are metal sheets with an insulating and waterproof material coated on their surface, which can prevent liquid from wetting the sensing electrodes 113, avoid current leakage, and improve the safety of the liquid flow rate measuring device 1.

[0059] Optionally, the insulating and waterproof material coated on the surfaces of the reference electrode 112 and the sensing electrode 113 can be silicone or resin, and the embodiments of the present invention do not specifically limit it.

[0060] Furthermore, the edges of the n-shaped plate are smoothly transitioned by curved surfaces. Since the n-shaped plate itself is a flat plate and its edges are smoothly transitioned by curved surfaces, when the n-shaped plate is immersed in liquid, the water-facing surface can be smoothly processed, which basically does not affect the liquid flow rate, thereby improving the accuracy of liquid flow rate measurement.

[0061] Please see Figure 5 As shown, the measurement component 12 includes a pulse power supply module 121 and a measurement module 122. Multiple sensing electrodes 113 are electrically connected to the positive terminal of the pulse power supply module 121, and a reference electrode 112 is electrically connected to the negative terminal of the pulse power supply module 121. The measurement module 122 is used to synchronously monitor the voltage of each of the multiple sensing electrodes 113 relative to the negative terminal of the pulse power supply module 121.

[0062] Specifically, the measurement module 122 can be a microcontroller, which includes a voltage acquisition circuit. Optionally, the measurement module 122 can be any one of STM32F407VET6, LPC1768FBD100K, TMS320F28027PTT, and GD32F103VGT6.

[0063] In this embodiment of the invention, by immersing the reference electrode 112 and multiple sensing electrodes 113 on an n-shaped plate as a data acquisition component in the liquid, the device has a simple structure and solves the problem that existing flow velocity measurements using rotary cup / propeller flowmeters are prone to foreign object entanglement and affect water flow, resulting in low measurement accuracy. The n-shaped plate immersed in the liquid can minimize the impact on the liquid flow velocity, thereby improving the measurement accuracy of the liquid flow velocity.

[0064] Furthermore, the liquid flow rate measuring device 1 of this embodiment only requires immersing the n-shaped plate in the liquid during use. Then, based on the cooperation of the pulse power module 121 and the measuring module 122, the voltage of each of the multiple sensing electrodes 113 relative to the negative terminal of the pulse power module 121 is obtained, and the liquid flow rate is calculated. This allows for simple and quick measurement and obtaining of the liquid flow rate, thus improving the measurement rate of liquid flow rate.

[0065] Furthermore, the liquid flow rate measuring device 1 of this embodiment of the invention does not require rotating parts, resulting in low hardware costs.

[0066] Please continue reading. Figure 5 As shown, more specifically, the pulse power supply module 121 includes a DC power supply 1211 and a multi-channel synchronous controllable switch 1212. The number of control loops of the multi-channel synchronous controllable switch 1212 is equal to the number of sensing electrodes 113, and the multiple sensing electrodes 113 are electrically connected to the control loops of the multi-channel synchronous controllable switch 1212 in a one-to-one correspondence. The multi-channel synchronous controllable switch 1212 is electrically connected to the positive terminal of the DC power supply 1211, and the reference electrode 112 is electrically connected to the negative terminal of the DC power supply 1211. Through the cooperation of the DC power supply 1211 and the multi-channel synchronous controllable switch 1212, multiple cycles of waveform pulse voltage are generated, thereby enabling the measurement module 122 to obtain the voltage of each of the multiple sensing electrodes 113 relative to the negative terminal of the DC power supply 1211, achieving simple and rapid measurement and obtaining the liquid flow rate result.

[0067] Specifically, the sampling frequency of the measurement module 122 is greater than or equal to 10kHz, which can shorten the sampling interval, increase the sampling data obtained per unit time, and improve the accuracy of the signal waveform.

[0068] Specifically, the frequency of the multi-channel synchronous controllable switch 1212 closing and opening is 10Hz~100Hz, and the equivalent internal resistance of the multi-channel synchronous controllable switch 1212 in the open state is greater than 1GΩ.

[0069] Specifically, the output voltage of the DC power supply 1211 is 5V~10V.

[0070] Furthermore, the measuring component 12 also includes multiple amplifying resistors 123, the number of which is equal to the number of sensing electrodes 113. Each amplifying resistor 123 corresponds one-to-one with a sensing electrode 113 and one-to-one with the control loop of the multi-channel synchronous controllable switch 1212. One end of each amplifying resistor 123 is electrically connected to a sensing electrode 113, and the other end is electrically connected to the multi-channel synchronous controllable switch 1212. By connecting an amplifying resistor 123 in series in each control loop, an amplified voltage drop signal can be formed, which is beneficial for calculating the voltage drop time of each subsequent control loop.

[0071] Specifically, the resistance of the amplifying resistor 123 is 10KΩ-1MΩ.

[0072] For ease of understanding, the operating principle of the liquid flow rate measuring device 1 is described herein in this embodiment of the invention. In use, the acquisition component 11 is placed in the liquid to be measured, such that the reference electrode 112 and the sensing electrode 113 are submerged. The main body 111 of the device is adjusted so that the plane containing the reference electrode 112 and the sensing electrode 113 is parallel to the direction of liquid flow. Then, the DC power supply 1211 is turned on. With the cooperation of the multi-channel synchronous controllable switch, the pulse power module 121 generates multiple cycles of waveform pulse voltage. Simultaneously, the voltage sampling array acquired by the measurement module 122 is recorded. The liquid flow rate can then be calculated based on the voltage sampling array and the voltage drop time of each control loop. The measurement and determination of the liquid flow rate are completed simply and quickly without affecting the liquid flow rate itself.

[0073] Example 2

[0074] Please see Figure 6 As shown, Figure 6 This is a schematic flowchart of a liquid flow rate measurement method provided in the second embodiment of the present invention. This liquid flow rate measurement method uses the liquid flow rate measuring device from Embodiment 1 to measure the liquid flow rate, such as... Figure 6 As shown, the liquid flow rate measurement method includes:

[0075] S1. In an immersion environment where both the plane of the reference electrode and the plane of the sensing electrode are parallel to the direction of liquid flow, the control pulse power supply module generates waveform pulse voltages of multiple cycles.

[0076] It should be noted that both the reference electrode and the sensing electrode are coated with an insulating and waterproof material. Therefore, when the reference electrode and the sensing electrode are immersed in the liquid, there is no electrical conductivity between them, preventing current leakage. When the reference electrode and the sensing electrode are immersed in the liquid, the position and angle of the main body of the device are adjusted so that the planes of the reference electrode and the sensing electrode are parallel to the direction of liquid flow. Since the main body of the device is a flat plate with smooth, rounded edges, the surface facing the water is smoothly treated when the main body is immersed in the liquid, which has virtually no impact on the liquid flow rate, thereby improving the accuracy of liquid flow rate measurement.

[0077] In embodiments of the present invention, such as Figure 7 As shown, Figure 7 This is a schematic diagram of the pulse voltage generated by the pulse power module provided in the second embodiment of the present invention. Specifically, after the pulse power module is turned on, the output voltage is 5~10V, and the pulse power module generates a waveform pulse voltage with 10~100 cycles, specifically a square pulse voltage.

[0078] S2. Record the voltage of each of the multiple sensing electrodes monitored by the measurement module relative to the negative terminal of the pulse power supply module in their respective circuits, and obtain the voltage sampling array U.

[0079] In this model, the first sensing electrode at the water source is designated as the first path, and the paths increase sequentially according to the direction of liquid flow. N represents the number of sensing electrodes, and the voltage sampling array is U = [U1, U2, U3, ..., U...]. N ], and U k = [uk1, uk2, uk3,…, ukn] (k =1, 2, 3,…, N), U N ukn represents the voltage of the last sensing electrode at the end of the water flow, and ukn represents the sampled value of the k-th voltage at the nth sampling time.

[0080] In this embodiment of the invention, the voltage sampling array U is a two-dimensional array of voltage samples. k This is a one-dimensional array of samples for the k-th voltage channel.

[0081] For ease of description, the embodiments of the present invention are described using 7 sensing electrodes as an example, and should not be construed as limiting the embodiments of the present invention. In this embodiment of the invention, the voltage sampling array U=[U1, U2, U3, U4, U5, U6, U7] monitored by the measurement module, wherein U1= [u11, u12, u13,…, u1n], u1n represents the sampled value of the first voltage at the nth sampling time, U2= [u21, u22, u23,…, u2n], u2n represents the sampled value of the second voltage at the nth sampling time, U3= [u31, u32, u33,…, u3n], u3n represents the sampled value of the third voltage at the nth sampling time, U4= [u41, u42, u43,…, u4n], u4n represents the sampled value of the fourth voltage at the nth sampling time, U5= [u51, u52, u53,…, u5n], u5n represents the sampled value of the fifth voltage at the nth sampling time, and U6= [u61, [u62, u63,…, u6n], where u6n represents the sampled value of the 6th voltage at the nth sampling time, and U7 = [u71, u72, u73,…, u7n], where u7n represents the sampled value of the 7th voltage at the nth sampling time.

[0082] S3. Calculate the fall time t of each voltage path. N The difference in fall time ΔT between the voltage and the first voltage path.

[0083] Wherein, the voltage fall time T = [t1, t2, t3, ..., t] N ], t N This represents the voltage drop time of the last induction electrode at the end of the water flow. The drop time is the average time required for the voltage to drop to 10% of its original value from the moment the pulse power supply module is disconnected. The drop time difference ΔT = [Δt1, Δt2, Δt3,…, Δt] N ], Δt k = t k - t1(k = 1, 2, 3,…, N).

[0084] In embodiments of the present invention, such as Figure 8 As shown, Figure 8 This is a schematic diagram of the voltage drop time provided in the second embodiment of the present invention. The drop time is the average value of the time required for the voltage to drop from 100% to 10%.

[0085] For ease of description, this embodiment of the invention uses seven sensing electrodes as an example, and should not be construed as limiting the scope of this embodiment. In this embodiment, the fall time of the first voltage is t1, the fall time of the second voltage is t2, the fall time of the third voltage is t3, the fall time of the fourth voltage is t4, the fall time of the fifth voltage is t5, the fall time of the sixth voltage is t6, and the fall time of the seventh voltage is t7. The difference between the fall time of the first voltage and the fall time of the first voltage is Δt1 = t1 - t1 = 0. The difference between the fall time of the second voltage and the fall time of the first voltage is Δt2 = t2 - t1. The difference between the fall time of the third voltage and the fall time of the first voltage is Δt3 = t3 - t1. The difference between the fall time of the fourth voltage and the fall time of the first voltage is Δt4 = t4 - t1. The difference between the fall time of the fifth voltage and the fall time of the first voltage is Δt5 = t5 - t1. The difference between the fall time of the sixth voltage and the fall time of the first voltage is Δt6 = t6 - t1. The difference between the fall time of the seventh voltage and the fall time of the first voltage is Δt7 = t7 - t1.

[0086] S4. Determine the liquid flow rate corresponding to the descent time difference ΔT based on the flow rate-descent time difference table; the flow rate-descent time difference table is a pre-measured mapping table used to indicate the mapping relationship between the liquid flow rate and the descent time difference.

[0087] For ease of description, this embodiment of the invention uses seven sensing electrodes as an example, and should not be construed as limiting the scope of the invention. In some possible embodiments, the relationship between flow rate and fall time difference is shown in Table 1 below:

[0088] Table 1

[0089]

[0090] In this embodiment of the invention, by pre-measuring the voltage drop time difference under different liquid flow rates and fitting a flow rate-drop time difference relationship table, when the liquid flow rate is subsequently measured, the liquid flow rate corresponding to the actual voltage drop time difference can be retrieved according to the flow rate-drop time difference relationship table, and then the liquid flow rate can be quickly measured according to the liquid flow rate measuring device in Embodiment 1.

[0091] Example 3

[0092] Please see Figure 9 , Figure 9 This is a schematic diagram of the liquid flow rate measuring device provided in the third embodiment of the present invention. Figure 9 As shown, the liquid flow rate measuring device may include:

[0093] Memory 901 storing executable program code;

[0094] Processor 902 coupled to memory 901;

[0095] In this embodiment, the processor 902 calls the executable program code stored in the memory 901 to execute the liquid flow rate measurement method in Embodiment 2.

[0096] This invention discloses a computer-readable storage medium storing a computer program that causes a computer to execute the liquid flow rate measurement method of Embodiment 2.

[0097] This invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the liquid flow rate measurement method in Embodiment 2.

[0098] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the invention.

[0099] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0100] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0101] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0102] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of the present invention.

[0103] In the embodiments provided by this invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0104] In various embodiments of the present invention, it should be understood that "A and / or B" means either A and B existing alone or A and B existing simultaneously.

[0105] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compactdisc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0106] The liquid flow rate measurement method disclosed in the embodiments of the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for measuring liquid flow velocity, characterized in that, The liquid flow rate measurement method uses a liquid flow rate measuring device to measure the flow rate of the liquid. The liquid flow rate measuring device includes a device body, a reference electrode, a pulse power supply module, a measuring module, and multiple sensing electrodes. The device body is an n-shaped plate. The reference electrode is disposed on one outer side of the n-shaped plate, and the multiple sensing electrodes are disposed on the other outer side of the n-shaped plate. The multiple sensing electrodes are electrically connected to the positive terminal of the pulse power supply module, and the reference electrode is electrically connected to the negative terminal of the pulse power supply module. The measurement module is used to synchronously monitor the voltage of each of the multiple sensing electrodes relative to the negative terminal of the pulse power module; The n-shaped plate is a flat plate, and the edges of the n-shaped plate are smoothly transitioned by an arc surface; The pulse power module includes a DC power supply and a multi-channel synchronous controllable switch, wherein the number of control loops of the multi-channel synchronous controllable switch is equal to the number of the sensing electrodes; The plurality of sensing electrodes are electrically connected one-to-one with the control circuit of the multi-channel synchronous controllable switch, the multi-channel synchronous controllable switch is electrically connected to the positive terminal of the DC power supply, and the reference electrode is electrically connected to the negative terminal of the DC power supply. The liquid flow velocity measurement method includes the following steps: In an immersion environment where both the plane of the reference electrode and the plane of the sensing electrode are parallel to the direction of liquid flow, the control pulse power supply module generates waveform pulse voltages of multiple cycles. The voltage of each of the multiple sensing electrodes in the circuit monitored by the measurement module relative to the negative terminal of the pulse power supply module is recorded to obtain a voltage sampling array U; The falling time t of each voltage is calculated respectively N The difference ΔT of the falling time of the first voltage The liquid flow rate corresponding to the descent time difference ΔT is determined based on the descent time difference ΔT and the flow rate-descent time difference relationship table; the flow rate-descent time difference relationship table is a pre-measured mapping table used to indicate the mapping relationship between the liquid flow rate and the descent time difference; In this model, the first sensing electrode at the water source is designated as the first path, and the paths increase sequentially according to the direction of liquid flow. N represents the number of sensing electrodes, and the voltage sampling array is U = [U1, U2, U3, ..., U...]. N ], and U k = [uk1, uk2, uk3,…, ukn] (k = 1,2, 3,…, N), U N This represents the voltage of the last induction electrode at the end of the water flow; ukn represents the sampled value of the k-th voltage at the nth sampling time; the voltage fall time T = [t1, t2, t3, ..., t] N ], t N This represents the voltage drop time of the last induction electrode at the end of the water flow. The drop time is the average time required for the voltage to drop to 10% of its original value from the moment the pulse power supply module is disconnected. The drop time difference ΔT = [Δt1, Δt2, Δt3,…, Δt] N ], Δt k = t k - t1 (k = 1, 2, 3,…, N).

2. The liquid flow rate measurement method according to claim 1, characterized in that, The liquid flow rate measurement method further includes multiple amplifying resistors, the number of which is equal to the number of sensing electrodes. Each amplifying resistor corresponds to one sensing electrode and each amplifying resistor corresponds to one control circuit of the multi-channel synchronous controllable switch. One end of each amplifying resistor is electrically connected to the sensing electrode, and the other end of each amplifying resistor is electrically connected to the multi-channel synchronous controllable switch.

3. The liquid flow rate measurement method according to claim 1, characterized in that, The sampling frequency of the measurement module is greater than or equal to 10kHz.

4. The liquid flow rate measurement method according to claim 1, characterized in that, The frequency of the multi-channel synchronous controllable switch closing and opening is 10Hz~100Hz; and the equivalent internal resistance of the multi-channel synchronous controllable switch in the open state is greater than 1GΩ.

5. The liquid flow rate measurement method according to claim 1, characterized in that, The output voltage of the DC power supply is 5V~10V.

6. The liquid flow rate measurement method according to claim 1, characterized in that, The reference electrode is a metal sheet with an insulating and waterproof material coated on its surface.

7. The liquid flow rate measurement method according to claim 6, characterized in that, The sensing electrode is a metal sheet coated with an insulating and waterproof material, and multiple sensing electrodes are arranged side by side at equal intervals.

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