Liquid flow measurement structure and measurement system applying the same

Abstract

The present disclosure relates to a liquid flow measurement structure and a measurement system using the same. The measurement structure comprises a flow channel body, an electrode sheet assembly arranged inside the flow channel body, the electrode sheet assembly comprising a plurality of capacitive sensing electrode sheets, and a digital capacitive sensing assembly connected to the electrode sheet assembly through signal lines, configured to collect capacitive signals of the plurality of capacitive sensing electrode sheets and output capacitive data associated with liquid level height. The plurality of capacitive sensing electrode sheets are arranged in a multi-layer grid structure inside the flow channel body, the multi-layer grid structure is distributed along the flow direction of the flow channel body, and a single layer grid structure is configured to arrange a single capacitive sensing electrode sheet. Alternatively, part of the capacitive sensing electrode sheets in the electrode sheet assembly are arranged in the sidewall of the flow channel body. The present disclosure has the advantages of simple structure, low cost, high reliability, and adaptability to various extreme application scenarios.

Description

Technical Field

[0001] This disclosure relates to the field of industrial technology, and in particular to a liquid flow measurement structure and a measurement system using the same. Background Technology

[0002] In fields such as medical care, industrial production, water conservancy projects, and energy transmission, pipeline flow measurement is a core component ensuring stable system operation and precise control. Especially in certain special environments, real-time monitoring of instantaneous surges and drops in flow rate is crucial. Furthermore, in the medical field, liquid flow measurement requires high cleanliness levels and must withstand high-temperature cleaning and disinfection. In industries such as industry, chemical engineering, and petroleum, fluid media often possess corrosive and high-viscosity characteristics, rendering traditional measurement solutions insufficiently durable and adaptable, leading to frequent malfunctions and measurement errors. Utility Model Content

[0003] This disclosure provides a liquid flow measurement structure and a measurement system using the same, in order to address the shortcomings of related technologies.

[0004] According to a first aspect of the present disclosure, a liquid flow measurement structure is provided, characterized in that the structure comprises:

[0005] Main body of the flow channel;

[0006] An electrode assembly is disposed inside the flow channel body, and the electrode assembly includes multiple capacitive sensing electrodes.

[0007] A digital capacitive sensing component is connected to the electrode assembly via a signal line. The digital capacitive sensing component is used to collect the capacitance signals of the multiple capacitive sensing electrodes to output capacitance data related to the liquid level height.

[0008] The plurality of capacitive sensing electrode sheets are disposed within a multi-layer grid structure inside the flow channel body. The multi-layer grid structure is distributed along the flow channel extension direction of the flow channel body, and a single-layer grid structure is used to configure a single capacitive sensing electrode sheet; or

[0009] Some of the capacitive sensing electrodes in the electrode assembly are embedded in the inner sidewall of the flow channel body.

[0010] Optionally, when the plurality of capacitive sensing electrode sheets are disposed on the multilayer grid structure, the number of layers in the multilayer grid structure is at least 2.

[0011] Optionally, when the plurality of capacitive sensing electrode sheets are disposed on the multilayer grid structure, the number of layers in the multilayer grid structure is three or more.

[0012] Optionally, the capacitive sensing electrode sheets are arranged on one side or symmetrically on both sides in each grid structure.

[0013] When the capacitance sensing electrode is arranged on one side, the electrode assembly measures the single-end capacitance to ground; when the capacitance sensing electrode is arranged symmetrically on both sides, the electrode assembly measures the dual-channel differential capacitance.

[0014] Optionally, when the partial capacitive sensing electrode is embedded in the inner sidewall of the flow channel body, the partial capacitive sensing electrode is evenly distributed along the pipe wall from bottom to top.

[0015] Optionally, the partial capacitive sensing electrode sheets are arranged around the inner sidewall of the flow channel body, and the number of partial capacitive sensing electrode sheets arranged in a circle at equal intervals is more than 6.

[0016] Optionally, at least one capacitive sensing electrode in the electrode assembly is attached to the outer wall of the flow channel body.

[0017] In this embodiment, at least one capacitive sensing electrode sheet is attached from the bottom of the tube wall to the top of the tube wall.

[0018] Optionally, the main body of the flow channel can be any one of a circular pipe, a rectangular pipe, an elliptical pipe, a horseshoe-shaped pipe, or an octagonal pipe.

[0019] Optionally, the main body of the flow channel is a one-piece molded structure, and the cross-section of the main body of the flow channel is a circle or rectangle with a diameter of 10mm-50mm.

[0020] According to a second aspect of the present disclosure, a liquid flow measurement system is provided, comprising:

[0021] Liquid pipelines; and

[0022] Liquid flow measurement structure in any of the above embodiments;

[0023] The liquid to be tested flows sequentially through the liquid pipe, the liquid flow measurement structure, and the container connected to the liquid flow measurement structure.

[0024] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0025] As can be seen from the above embodiments, the liquid flow measurement structure and measurement system using the present disclosure place the electrode assembly inside the grid or embed it in the inner sidewall of the flow channel body, thereby achieving liquid flow detection or monitoring without direct contact with the liquid, thus making it flexibly applicable to extreme application scenarios with high cleanliness or high corrosivity. Secondly, the present disclosure uses a multi-channel digital capacitive sensing component as a processor chip, which can accurately detect the liquid level height at different positions in the pipeline, thereby realizing multi-channel data acquisition and processing, effectively improving the accuracy of liquid flow measurement. In addition, the present disclosure uses the flow channel body structure as a separate flow measurement structure, which can be flexibly adapted to various scenarios with measurement requirements. It can be understood that, compared with traditional flow measurement equipment, the liquid flow measurement structure in the present disclosure reduces the complexity of mechanical structure and installation requirements and accuracy requirements, thereby also reducing equipment costs, maintenance costs and measurement costs. It should be noted that when using the grid-encapsulated capacitive sensing electrode sheet solution, in addition to ensuring that the electrode sheet is not exposed and is suitable for extreme working environments such as high cleanliness or high corrosiveness, the number of grids can also be flexibly adjusted according to the viscosity and flow rate of the liquid being measured. In summary, this disclosure has a simple structure, lower manufacturing cost, and wider range of applications, while also possessing extremely high reliability, precision, and real-time performance.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0028] Figure 1a This is an assembly schematic diagram of a liquid flow measurement structure according to an embodiment of the present disclosure;

[0029] Figure 1b This is a schematic diagram illustrating the use of a liquid flow measurement structure according to an embodiment of the present disclosure;

[0030] Figure 2 This is a cross-sectional view of the multilayer grid and electrode sheet shown according to embodiments of the present disclosure;

[0031] Figure 3 This is a cross-sectional view of a single-layer electrode sheet assembly shown according to an embodiment of the present disclosure;

[0032] Figure 4This is a schematic diagram of another liquid flow measurement structure shown according to an embodiment of the present disclosure;

[0033] Figure 5 This is a partial schematic diagram (B) of another liquid flow measurement structure shown according to an embodiment of the present disclosure;

[0034] Figure 6 This is a partial schematic diagram (C) of another liquid flow measurement structure shown according to an embodiment of the present disclosure. Detailed Implementation

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0036] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to those listed; the terms “first” and “second” are used only as illustrative marks and are not intended to limit the number, importance, or order of their contents. For example, without departing from the scope of this application, a first power source may also be referred to as a second power source, and a second power source may also be referred to as a first power source. Depending on the context, “when…” may be interpreted as “when…”, “if…”, or “in response to determination.”

[0037] In the following description, suffixes such as "module" or "unit" used to denote elements are used only for the purposes of this application and have no specific meaning in themselves. Therefore, "module" or "unit" can be used interchangeably.

[0038] Please see Figures 1a to 6 . Figure 1a This is an assembly schematic diagram of a liquid flow measurement structure according to an embodiment of the present disclosure; Figure 1b This is a schematic diagram illustrating the use of a liquid flow measurement structure according to an embodiment of the present disclosure; Figure 2 This is a cross-sectional view of the multilayer grid and electrode sheet shown according to embodiments of the present disclosure; Figure 3This is a cross-sectional view of a single-layer electrode sheet assembly shown according to an embodiment of the present disclosure; Figure 4 This is a schematic diagram of another liquid flow measurement structure shown according to an embodiment of the present disclosure; Figure 5 This is a partial schematic diagram (B) of another liquid flow measurement structure shown according to an embodiment of the present disclosure; Figure 6 This is a partial schematic diagram (C) of another liquid flow measurement structure shown according to an embodiment of the present disclosure.

[0039] In one embodiment, such as Figures 1a to 3 As shown. This disclosure proposes a liquid flow measurement structure 10, which has a multi-layer grid structure 300 set in the main body of the flow channel 200. The flow channel with the multi-layer grid structure 300 can measure the liquid flow when it is tilted and fixed. When the liquid passes through the multi-layer grid structure 300, the liquid flow changes due to gravity. The liquid expands from the bottom grid to the top grid in sequence. The signals are collected synchronously by multiple capacitive sensing electrodes 100 embedded in the grid. The liquid level height change inside the main body of the flow channel 200 with a fixed tilt angle is monitored in real time. The spatial distribution of the liquid level inside the main body of the flow channel 200 is inverted by using the mapping relationship between liquid level and capacitance.

[0040] Understandably, the working principle of liquid level-capacitance mapping is to use the induced capacitance of the liquid to detect the presence of liquid. When no liquid is near the electrode, due to the presence of distributed capacitance, the electrode has a certain static capacitance to ground. When the liquid level rises and approaches the electrode, the parasitic capacitance of the liquid will couple to this static capacitance, increasing the single-end capacitance to ground value measured by the electrode. When the capacitance value exceeds a certain threshold, the liquid level can be considered to have reached the electrode position. Multiple capacitance sensing electrode plates 100 distributed at different heights within the flow channel body 200, formed by any of the following: circular, rectangular, elliptical, horseshoe, or octagonal pipes, can quickly determine the height of the liquid level in the pipe. Furthermore, since the capacitance value changes significantly between when the liquid level is not at the electrode position and when it is, the effects of unstable dielectric constants of the measured fluid and weak capacitance signals from low-conductivity dielectrics can be effectively shielded.

[0041] The main body of the flow channel 200 is a one-piece molded structure with a cross-section of a circle or rectangle with a diameter of 10mm-50mm.

[0042] Optionally, the flow channel body 200 can also be any of the following: circular pipe, rectangular pipe, elliptical pipe, horseshoe pipe, or octagonal pipe. The size is not limited to 10mm-50mm, but can be determined based on the actual application scenario, such as the liquid type, design cost, and accuracy requirements. The above measurement method is equally applicable to standard and non-standard pipes—such as irregularly shaped pipes. It is understood that the larger the pipe size, the more grid layers and electrode plates can be installed. For pipes with excessively small sizes, a metal plating method can be used to fix the electrode plates. Therefore, the key improvement of this disclosure lies in the design of the overall structure. By combining multiple features such as the number of grid layers, the number of electrode plates, and the pipe shape, along with its inclined measurement method, liquid flow measurement can be completed.

[0043] Preferably, in this embodiment, a larger electrode sheet can also be used, which is attached to the bottom to the top of the pipe to perform full-range detection inside the pipe.

[0044] In the above embodiments, this disclosure has advantages such as simple structure, low cost, and non-invasive measurement; the flow testing scheme is robust and applicable to high-temperature and highly corrosive testing environments. Simultaneously, the capacitor element is embedded inside the flow channel grid, with no exposed electrodes, making it suitable for extreme working environments such as high cleanliness or high corrosivity. Furthermore, the number of grids in the multi-layer grid structure 300 can be flexibly adjusted according to the viscosity and flow rate of the liquid being measured, resulting in lower costs compared to prior art.

[0045] Specifically, the liquid flow measurement structure 10 proposed in this disclosure is as follows: Figures 1a to 3 As shown, the flow channel body 200 has a multi-layer grid structure 300 inside. The grid length is designed according to different liquids or different measurement environments to force the liquid in the flow channel into layers. Electrode sheets of the same thickness and size are embedded inside each grid layer. If measuring single-ended capacitance to ground, only one electrode sheet can be placed on one side of each grid layer. If measuring double-ended capacitance, capacitance sensing electrode sheets 100 are placed symmetrically in each grid layer (see [link to demonstration] for details). Figure 3 The capacitive sensing electrode 100 is connected to the digital capacitive sensing component 500 via a signal line 400. The multi-channel digital capacitive sensing component 500 is used for synchronous monitoring of multiple capacitive signals. It is understood that this disclosure does not limit the configuration of the digital capacitive sensing component 500; it can be located inside or outside the flow channel body 200. When located inside the flow channel body 200, corrosion-resistant insulation and sealing are typically required. Since this component is not a key improvement of this disclosure, its configuration will not be described further.

[0046] In actual use, the horizontal tilt angle θ of the main body of the flow channel is fixed at 200°, and the liquid height in the flow channel is as follows: Figure 1b As shown in the shaded area 600, the liquid level has reached the third grid from the bottom, and the electrode plates within these three grids exhibit a significant capacitance signal response. (As shown...) Figure 2 As shown in the diagram of the grid and electrode assembly, five grid layers are evenly distributed within the flow channel, and five electrode layers are embedded within the grid layers. Figure 3 As shown, the capacitive sensing electrode 100 consists of two symmetrically arranged electrode plates on the same grid layer. For each grid layer, depending on the application scenario, a single-ended capacitance to ground or a double-ended capacitance can be flexibly selected. This disclosure does not impose any limitations. It is understood that when the capacitive sensing electrode 100 is arranged on one side, the electrode assembly measures the single-ended capacitance to ground; when the capacitive sensing electrode 100 is arranged symmetrically on both sides, the electrode assembly measures the dual-channel differential capacitance.

[0047] It is understood that the present disclosure encapsulates the above-mentioned capacitive sensing electrode 100 through a multi-layer grid structure 300. Each grid structure can effectively protect the corresponding capacitive sensing electrode 100. At the same time, the arrangement of the capacitive sensing electrode 100 can be customized according to actual needs. For example, it can be at least 2 layers, preferably 3 or more layers, such as 5 to 15 layers, thereby achieving the accuracy and reliability of the measurement scheme, as well as the wide range of application scenarios of the overall measurement structure.

[0048] Furthermore, it should be noted that the number of grid layers and the number of electrode plates are not limited to a fixed amount. The more grid layers there are, the better the flow measurement accuracy will be. The specific number of grid layers depends on factors such as the flow channel size, liquid type, cost, and accuracy requirements.

[0049] In practical use, when measuring liquid flow rate using the aforementioned liquid flow measurement structure 10, the liquid flow channel is first tilted at a fixed angle so that the pipe forms a certain tilt angle θ with the horizontal direction (angle θ satisfies 0° < θ < 90°). This tilt angle is set reasonably according to the actual measurement requirements and pipe installation conditions. By converting gravitational potential energy into kinetic energy to drive fluid motion, and combining Bernoulli's equation and continuity equation in fluid mechanics, the flow rate Q of the fluid at the electrode plate installation position is calculated using the following formula.

[0050]

[0051] Where λ is the Darcy friction coefficient, L is the channel length (m), d represents the inner diameter of the channel, g represents the gravitational acceleration, h is the height difference between the inlet and outlet of the equal-diameter channel, and A represents the current cross-sectional area of ​​the liquid in the pipe.

[0052] Specifically, the flow measurement principle is based on the capacitance effect between the liquid and the metal electrodes. The height of the liquid in the current flow channel is determined by multiple electrodes, and then the cross-sectional area of ​​the liquid is calculated. Based on the work done by gravity, the liquid flows from high to low. In a flow channel with a certain inclination angle, the fluid velocity is calculated. Based on the liquid velocity and the cross-sectional area, the flow rate is obtained.

[0053] The flow channel incorporates a multi-layered, elongated grid structure, forcing a liquid of a certain viscosity into stratified layers due to gravity within the inclined channel. For example, at lower flow rates, the fluid resides only in the bottom grid or a few grids below it; as the flow rate increases, the fluid successively overflows the upper grids. Each grid layer contains or is plated with two identical copper or metal sheets serving as electrodes. When using a single-ended capacitance measurement, only one electrode needs to be connected to the multi-channel capacitor chip. When using a double-ended capacitance measurement, both electrodes are connected to the multi-channel capacitor chip. Based on the capacitance response of the electrodes, the current fluid height within the flow channel is determined. For example, when the fluid is only in the bottom grid, the liquid height is h1, and only the capacitor in the bottom grid responds. When the fluid is in the second grid, the liquid height is h2, and at least two capacitors will respond, and so on.

[0054] In summary, the liquid flow measurement structure 10 provided by this disclosure places the electrode assembly inside the grid or embedded in the inner sidewall of the flow channel body 200, thereby enabling the detection or monitoring of liquid flow without direct contact with the liquid. This allows for flexible application in extreme application scenarios with high cleanliness or high corrosivity. Secondly, this disclosure uses a multi-channel digital capacitive sensing component 500 as a processor chip, which can accurately detect the liquid level at different positions in the pipeline, thereby achieving multi-channel data acquisition and processing, effectively improving the accuracy of liquid flow measurement. Furthermore, this disclosure uses the flow channel body 200 structure as a separate flow measurement structure, which can be flexibly adapted to various scenarios with measurement requirements. It is understood that, compared with traditional flow measurement equipment, the liquid flow measurement structure 10 in this disclosure reduces the complexity of mechanical structure and installation requirements and accuracy requirements, thereby also reducing equipment costs, maintenance costs, and measurement costs. It should be noted that when using the multi-grid encapsulated capacitive sensing electrode 100, in addition to ensuring that the electrode is not exposed and is suitable for extreme working environments such as high cleanliness or high corrosivity, the number of grids can also be flexibly adjusted according to the viscosity and flow rate of the liquid to be measured.

[0055] In another embodiment, such as Figures 4 to 6As shown, this disclosure also proposes another liquid flow measurement structure 10'. In this embodiment, a portion of the capacitive sensing electrode 300' in the electrode assembly is embedded in the inner sidewall of the flow channel body 200'. This portion of the capacitive sensing electrode 300' has n capacitive electrodes evenly nested on the pipe sidewall from bottom to top. Each electrode is connected to a pin of the digital capacitor chip using a signal line 400'. Specifically, a portion of the capacitive sensing electrode 100' is arranged around the inner sidewall of the flow channel body 200', and the number of these portions of the capacitive sensing electrode 100' equidistantly arranged in a single circle is six or more.

[0056] Furthermore, in this embodiment, at least one capacitive sensing electrode 100' is attached to the outer wall of the flow channel body 200'; wherein, the at least one capacitive sensing electrode 100' is attached from the bottom to the top of the wall, and is also connected to the pins of the digital capacitor chip using signal lines 400'. The shaded portion 600' represents the current liquid level within the pipe body 200'.

[0057] For example, when the liquid level in the pipe overflows the electrode plate x i At that time, the single-ended capacitance to ground measured by the electrode plate will change significantly. Therefore, by observing the multiple electrode plates x1 to x2 embedded in the tube wall... n Changes in capacitance can efficiently determine the liquid level depth h1 to h2. n This effectively avoids the problem of measurement result fluctuations caused by the instability of the dielectric constant of the measured fluid. Furthermore, an electrode plate is attached to the outer wall of the pipe from the bottom to the top. The single-ended capacitance of this electrode plate increases as the liquid level in the pipe rises. Specifically, when the liquid level changes, the dielectric constant distribution between the liquid and the chip changes, resulting in a change in the capacitance value detected by the chip. By establishing a pre-defined correspondence between capacitance value and liquid level, the liquid level at different locations can be determined. Multiple channels of the chip are connected to multiple electrode plates on the pipe to collect capacitance data at different locations in the pipe. If the digital capacitance sensing component 500' only includes a sensing chip, the chip is electrically connected to the data processing module to transmit the collected capacitance data to the data processing module. If the digital capacitance sensing component 500' includes a digital capacitance processor chip, the capacitance value of each channel can be directly output using the serial port pin of the chip. It is understood that the specific configuration of the digital capacitance sensing component 500' can be determined according to actual needs, such as cost requirements, product size requirements, etc. This disclosure does not impose any restrictions here.

[0058] In contrast, encapsulating multiple electrode sheets with a grid aims to force the flow of liquids with a certain viscosity, allowing for the design of multi-level grids according to actual needs. However, the presence of the grid can obstruct liquid flow to some extent, a factor that needs to be considered in practical applications. The electrode sheet distribution scheme around the flow channel wall in the above embodiment does not require consideration of the grid's obstruction of the liquid, but it also increases the instability of capacitance measurement, as the electrode sheets in the upper part of the pipe are susceptible to liquid splashing, leading to measurement instability. Therefore, the two design methods provided in this disclosure can be chosen according to the actual scenario, but they both belong to the same improved concept.

[0059] Furthermore, based on the same improved concept, this disclosure also provides a liquid flow measurement system applicable to any of the above embodiments, as shown in the following embodiment. Since the principle by which this liquid flow measurement system embodiment solves the problem is similar to that of the liquid flow measurement structure embodiment described above, the implementation of this liquid flow measurement system embodiment can refer to the implementation of the above embodiments, and repeated details will not be described again.

[0060] In this embodiment, the measurement system includes: a liquid pipeline; and a liquid flow measurement structure as described in any of the above embodiments; wherein the liquid to be measured flows sequentially through the liquid pipeline, the liquid flow measurement structure, and the container connected to the liquid flow measurement structure.

[0061] It is understood that the main body of the flow channel can be tilted and assembled with the lower container, or the liquid funnel can be tilted and assembled with the flow channel, thereby achieving the aforementioned tilted and fixed flow channel main body. In specific applications, such as during milk filling, the liquid funnel is placed horizontally, and the funnel outlet is tilted at a certain angle to the measuring structure. The liquid enters the flow channel from the funnel position under the action of gravity.

[0062] In summary, the liquid flow measurement structure and measurement system provided in this disclosure place the electrode assembly inside the grid or embedded in the inner sidewall of the flow channel body, thereby achieving liquid flow detection or monitoring without direct contact with the liquid. This allows for flexible application in extreme application scenarios with high cleanliness or high corrosivity. Secondly, this disclosure uses a multi-channel digital capacitive sensing component as a processor chip, enabling accurate detection of liquid level at different locations within the pipeline, thus achieving multi-channel data acquisition and processing, effectively improving the accuracy of liquid flow measurement. Furthermore, this disclosure uses the flow channel body structure as a separate flow measurement structure, which can be flexibly adapted to various scenarios with measurement requirements. It is understood that, compared to traditional flow measurement equipment, the liquid flow measurement structure in this disclosure reduces the complexity of mechanical structure and installation requirements, as well as accuracy requirements, thereby also reducing equipment costs, maintenance costs, and measurement costs. It should be noted that when using the grid-encapsulated capacitive sensing electrode sheet solution, in addition to ensuring that the electrode sheet is not exposed and is suitable for extreme working environments such as high cleanliness or high corrosiveness, the number of grids can also be flexibly adjusted according to the viscosity and flow rate of the liquid being measured. In summary, this disclosure has a simple structure, lower manufacturing cost, and wider range of applications, while also possessing extremely high reliability, precision, and real-time performance.

[0063] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A liquid flow measurement structure, characterized in that, The structure includes: Main body of the flow channel; An electrode assembly is disposed inside the flow channel body, and the electrode assembly includes multiple capacitive sensing electrodes. A digital capacitive sensing component is connected to the electrode assembly via a signal line. The digital capacitive sensing component is used to collect the capacitance signals of the multiple capacitive sensing electrodes to output capacitance data related to the liquid level height. The plurality of capacitive sensing electrode sheets are disposed within a multi-layer grid structure inside the flow channel body. The multi-layer grid structure is distributed along the flow channel extension direction of the flow channel body, and a single-layer grid structure is used to configure a single capacitive sensing electrode sheet; or Some of the capacitive sensing electrodes in the electrode assembly are embedded in the inner sidewall of the flow channel body.

2. The liquid flow measurement structure according to claim 1, characterized in that, When the plurality of capacitive sensing electrode sheets are disposed on the multi-layer grid structure, the number of layers in the multi-layer grid structure is at least 2.

3. The liquid flow measurement structure according to claim 2, characterized in that, When the plurality of capacitive sensing electrode sheets are disposed on the multi-layer grid structure, the number of layers in the multi-layer grid structure is 3 or more.

4. The liquid flow measurement structure according to claim 2, characterized in that, The capacitive sensing electrode sheets are arranged either on one side or symmetrically on both sides in each grid structure. When the capacitance sensing electrode is arranged on one side, the electrode assembly measures the single-end capacitance to ground; when the capacitance sensing electrode is arranged symmetrically on both sides, the electrode assembly measures the dual-channel differential capacitance.

5. The liquid flow measurement structure according to claim 1, characterized in that, When the partial capacitive sensing electrode is embedded in the inner sidewall of the flow channel body, the partial capacitive sensing electrode is evenly distributed along the pipe wall from bottom to top.

6. The liquid flow measurement structure according to claim 5, characterized in that, The partial capacitive sensing electrode sheets are arranged around the inner sidewall of the flow channel body, and the number of partial capacitive sensing electrode sheets arranged in a circle at equal intervals is more than 6.

7. The liquid flow measurement structure according to claim 5, characterized in that, At least one capacitive sensing electrode in the electrode assembly is attached to the outer wall of the flow channel body. In this embodiment, at least one capacitive sensing electrode sheet is attached from the bottom of the tube wall to the top of the tube wall.

8. The liquid flow measurement structure according to claim 1, characterized in that, The main body of the flow channel is any one of the following: circular pipe, rectangular pipe, elliptical pipe, horseshoe pipe, and octagonal pipe.

9. The liquid flow measurement structure according to claim 8, characterized in that, The main body of the flow channel is a one-piece molded structure, and the cross-section of the main body of the flow channel is a circle or rectangle with a diameter of 10mm-50mm.

10. A liquid flow measurement system, characterized in that, include: Liquid pipelines; and The liquid flow measurement structure according to any one of claims 1 to 9; The liquid to be tested flows sequentially through the liquid pipe, the liquid flow measurement structure, and the container connected to the liquid flow measurement structure.

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