A method and device for continuously detecting the fluid level and flow rate of surface fluid

Abstract

The application discloses a kind of surface fluid liquid flow rate continuous detection device, the method is according to surface fluid liquid level flow and full pipe flow velocity liquid level characteristics, according to speed impact and pressure direct law, by river channel open channel maximum velocity flow model calculation, full pipe flow center velocity flow model calculation, fast calculation display liquid flow rate, liquid level, flow etc. Instantaneous value and cumulative statistical data.The device of the application is scientific and reasonable, accurate and simple, cheap and applicable, and can be widely used in water environment and hydrological flow liquid level low-cost continuous monitoring.It is especially suitable for short-term status investigation of field water environment, long-term hydrological monitoring and industrial park water environment flow rate monitoring, suitable for pipe full flow / non-full flow and engineering interaction change, suitable for full pipe pressure flow and self-flow and other complex change conditions.The device consumes less power, and can be combined with solar photovoltaic panels for long-term monitoring in the field, achieving low-carbon environmental protection hydrological and water environmental monitoring.

Description

Technical Field

[0001] This invention relates to a method and apparatus for continuous detection of surface fluid level and flow rate. Background Technology

[0002] During my country's urbanization process, urban topography, landforms, and runoff conditions have been altered, resulting in a reduction in surface vegetation and ponds / lakes, an increase in impermeable surfaces, a weakening of surface water retention and infiltration capacity, a shortening of runoff generation and confluence time, and an increase in surface runoff. Industrial development has accelerated the construction of industrial parks in my country, making the need for rainwater and sewage separation and the monitoring and management of sewage pipe networks in these parks both urgent and complex. Therefore, accurate and timely monitoring of urban pipe networks, surface runoff levels, and flow rates is crucial for overall flood control and drainage planning and emergency management, as well as for the comprehensive balance and effective utilization of urban park water systems.

[0003] Continuous monitoring of surface fluid (especially surface water) flow and level is a crucial component of river and canal network monitoring systems. While ultrasonic level gauges and flow meters are currently in use and functioning well, practical applications are limited due to the numerous monitoring points, varying conditions, high equipment prices, and installation constraints. The most widely used principle for river and canal network flow and level monitoring is Doppler ultrasonic sensing. This type of device does not require contact with the fluid and is unaffected by parameters such as temperature, viscosity, and density. It is technologically advanced and highly accurate, but expensive and has high operating costs, and suffers from measurement blind spots. Its use in large-scale, batch monitoring of pipe networks is often hampered by budget constraints. This invention provides a cost-effective method and device for continuous fluid level and velocity monitoring, adaptable to various scenarios, to meet societal development and market demands. Summary of the Invention

[0004] This invention discloses a method and apparatus for continuous detection of surface fluid level and flow rate, in order to solve any of the above-mentioned and other potential problems in the prior art.

[0005] To solve the above problems, the technical solution of the present invention is: a method for continuous detection of surface fluid level and velocity, which specifically includes the following steps: S1) First, assemble the test equipment and place it in the fluid on the surface of the liquid to be measured. S2) The liquid level and water depth data of the fluid on the surface of the liquid to be measured are obtained by adjusting the testing equipment. Then, according to the fluid specific gravity and viscosity testing equipment, the flow rate collector is below the fluid surface, so that the fluid passes through the flow rate collector and impacts to generate tensile force. S3) Real-time acquisition of liquid level and water depth data of the fluid on the surface to be measured, as well as tensile force data, and calculation of liquid level, flow velocity and flow rate parameters of the fluid on the surface to be measured through the model.

[0006] Furthermore, the specific steps in S3.1 are as follows: S3.1) Based on the collected tension F 拉 Impact force F 冲 And the forces acting in the vertical direction, the gravity G acting on the flow velocity collector, and the buoyancy F of the flow velocity collector. 浮 Substitute the values ​​into the following formula to calculate the flow velocity at the fluid measuring point. The formula is as follows: In the formula: F 冲 The force exerted by the fluid on the velocity collector is expressed in kg·m / s. , The comprehensive correction coefficient is dimensionless. This refers to the bulk density of the fluid mixture, expressed in kg / kWh. , The inlet radius of the horn-shaped sensor is in meters (m). L1 is the outlet radius of the horn sensor, in meters (m); L2 is the length of the horn segment of the horn sensor, in meters (m). The unit for calculating the flow velocity at the fluid measuring point is: m / s. S3.2) Calculate the flow velocity based on the fluid measuring points obtained from S3.1). Substitute the values ​​into the flow calculation model to obtain the flow rate.

[0007] Furthermore, when the fluid is inside the pipe, the flow rate calculation model is as follows: , In the formula: This refers to the flow rate under pressure in the pipeline, expressed in cubic meters per second (m³). 3 / s, This refers to the cross-sectional area of ​​the pipe, in meters (m²). 2 , The radius of the pipe is in meters (m). The average flow velocity in the pipe is expressed in m / s. For measuring flow velocity in pipelines, the unit is m / s. is the pipe flow damping coefficient, which is dimensionless; When the fluid is in a river or canal, the flow rate calculation model is as follows: , The free surface flow rate of the river / canal pipeline is given in m. 3 / s, The cross-sectional area for fluid flow is expressed in m². 2 , The effective width of the canal for flow, in meters. The effective depth of the river / canal flow, expressed in meters (m). The average flow velocity across the river / canal cross-section is expressed in m / s. For flow velocity sensors to measure flow velocity, the unit is: m / s; This is a dimensionless correction factor for river and canal velocity.

[0008] Another object of the present invention is to provide a testing apparatus for implementing the above-described testing method, the testing apparatus comprising a measurement unit, a data acquisition and transmission unit, and a data processing and display unit; The measuring unit is used to measure the upper surface of the fluid on the surface of the liquid being measured and to receive the real-time impact force of the fluid on the surface of the liquid. The data acquisition and transmission unit is used to acquire measurement data from the measurement unit in real time and upload the acquired data. The data processing and display unit is used to analyze and process the received real-time data to obtain the velocity and flow rate of the fluid on the liquid surface to be measured.

[0009] Furthermore, the measuring unit includes: a fixed slide bar, a core positioning pin, a liquid level self-control float, a flow rate collector, and a fluid density adjustment counterweight ball; The fixed slide rod is vertically arranged, and the tube core positioning pin is horizontally movably arranged on the fixed slide rod; The liquid level self-control float is movably mounted on the fixed slide bar and is located at the lower end of the tube core positioning pin. The fluid density adjusting counterweight ball is movably mounted on the fixed slide bar located at the lower end of the liquid level self-control float ball, and the flow rate collector is connected to the fluid density adjusting counterweight ball via a connecting rope.

[0010] Furthermore, the flow rate collector includes a flared section and a cylindrical section; The open end of the flared section is the water inlet, and the narrowed end is connected to the cylindrical section.

[0011] Furthermore, the length of the flared section is greater than or equal to the length of the cylindrical section; Furthermore, the diameter of the cylindrical section is less than 1 / 2 the diameter of the flared section.

[0012] Furthermore, the data acquisition and transmission unit includes a data transmission device, a flow rate sensor, and a tension sensor; The flow rate sensor is located inside the cylindrical section, and the tension sensor is located at the connection between the connecting rope and the fluid density adjustment counterweight ball. The data transmitting device is connected to the flow rate sensor and the tension sensor respectively.

[0013] Furthermore, the data processing and display unit is a host computer, which is connected to the data sending device.

[0014] Furthermore, the self-regulating float is a closed hollow sphere made of polyvinyl chloride; The fluid density adjusting counterweight ball is a hollow ball with a vinyl chloride sealing port, and the sealing port can be opened to fill counterweight sand.

[0015] The beneficial effects of this invention are as follows: This invention applies hydrological and hydraulic mechanisms, combining traditional mechanism innovation with big data simulation correction, and combining simple and rapid detection with accurate correction calculation to achieve the following multiple functions: 1. Wide applicability: Applicable to metering of different operating conditions and changes in flow rate and velocity of full-pipe pressure flow and free surface flow in pipelines; 2. Wide application scenarios: Capable of meeting online monitoring and portable field detection needs; 3. Wide metering cycle: Data acquisition can be achieved from 1 minute to 1 hour as needed; 4. Low production cost: Applicable to mass installation metering; 5. Can be integrated with the BeiDou system to achieve accurate spatiotemporal docking metering; 6. Low energy consumption: Data is used for data acquisition, transmission and processing by data sensors, resulting in low energy consumption and enabling low-carbon energy saving with solar photovoltaic panels. Attached Figure Description

[0016] Figure 1 This is a logic block diagram of a method for continuous detection of surface fluid level and flow velocity according to the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of a continuous surface fluid level and flow rate detection device according to the present invention.

[0018] Figure 3 This is a schematic diagram illustrating the force principle of the flow velocity collector of the present invention.

[0019] In the picture: 1. Fixed slide bar; 2. Pipe core positioning pin; 3. Liquid level self-control float; 4. Flow rate collector; 5. Flow rate sensor; 6. Tension sensor; 7. Fluid density adjustment counterweight ball; 8. Data transmission device; 9. Data processing and display unit. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0021] like Figure 1 As shown, the present invention provides a method for continuous detection of surface fluid level and velocity, which specifically includes the following steps: S1) First, assemble the test equipment and place it in the fluid on the surface of the liquid to be measured. S2) The liquid level and water depth data of the fluid on the surface of the liquid to be measured are obtained by adjusting the testing equipment. Then, according to the fluid specific gravity and viscosity testing equipment, the flow rate collector is below the fluid surface, so that the fluid passes through the flow rate collector and impacts to generate tensile force. S3) Real-time acquisition of liquid level and water depth data of the fluid on the surface to be measured, as well as tensile force data, and calculation of liquid level, flow velocity and flow rate parameters of the fluid on the surface to be measured through the model.

[0022] The specific steps in S3.1 are as follows: S3.1) Based on the collected tension F 拉 Impact force F 冲 And the forces acting in the vertical direction, the gravity G acting on the flow velocity collector, and the buoyancy F of the flow velocity collector. 浮 Substitute the values ​​into the following formula to calculate the flow velocity at the fluid measuring point. The formula is as follows: In the formula: F 冲 The force exerted by the fluid on the velocity collector is expressed in kg·m / s. t represents time, in seconds. The comprehensive correction coefficient is dimensionless. This refers to the bulk density of the fluid mixture, expressed in kg / kWh. , The inlet radius of the horn-shaped sensor is in meters (m). L1 is the outlet radius of the horn sensor, in meters; L2 is the length of the horn segment of the horn sensor, in meters. Calculate the flow velocity at the fluid measuring point, in m / s. S3.2) Calculate the flow velocity based on the fluid measuring points obtained from S3.1). Substitute the values ​​into the flow calculation model to obtain the flow rate.

[0023] When fluid is inside a pipe, the flow rate calculation model is as follows: , In the formula: This refers to the flow rate under pressure in the pipeline, expressed in cubic meters per second (m³). 3 / s, This refers to the cross-sectional area of ​​the pipe, in meters (m²). 2 , The radius of the pipe is in meters (m). The average flow velocity in the pipe is expressed in m / s. For measuring flow velocity in pipelines, the unit is m / s. is the pipe flow damping coefficient, which is dimensionless; When the fluid is in a river or canal, the flow rate calculation model is as follows: , Free surface flow rate of river and canal pipelines, unit: m³ / s 3 / s, The cross-sectional area for fluid flow is expressed in m². 2 , The effective depth of the river / canal flow, expressed in meters (m). The average flow velocity across the river / canal cross-section is expressed in m / s. For flow velocity sensors to measure flow velocity, the unit is: m / s; This is a dimensionless correction factor for river and canal velocity.

[0024] like Figure 2 and Figure 3 As shown, a testing apparatus for implementing the above-described testing method includes a measurement unit, a data acquisition and transmission unit, and a data processing and display unit. The measuring unit is used to measure the upper surface of the fluid on the surface of the liquid being measured and to receive the real-time impact force of the fluid on the surface of the liquid. The data acquisition and transmission unit is used to acquire measurement data from the measurement unit in real time and upload the acquired data. The data processing and display unit is used to analyze and process the received real-time data to obtain the velocity and flow rate of the fluid on the liquid surface to be measured.

[0025] The measuring unit includes: a fixed slide bar, a tube positioning pin, a liquid level self-control float, a flow rate collector, and a fluid density adjustment counterweight ball; The fixed slide rod is vertically arranged, and the tube core positioning pin is horizontally movably arranged on the fixed slide rod; The liquid level self-control float is movably mounted on the fixed slide bar and is located at the lower end of the tube core positioning pin. The fluid density adjusting counterweight ball is movably mounted on the fixed slide bar located at the lower end of the liquid level self-control float ball, and the flow rate collector is connected to the fluid density adjusting counterweight ball via a connecting rope.

[0026] The flow rate collector includes a flared section and a cylindrical section; The open end of the flared section is the water inlet, and the narrowed end is connected to the cylindrical section.

[0027] The length of the flared section is greater than or equal to the length of the cylindrical section; Furthermore, the diameter of the cylindrical section is less than 1 / 2 the diameter of the flared section.

[0028] The data acquisition and transmission unit includes a data transmission device, a flow rate sensor, and a tension sensor; The flow rate sensor is located inside the cylindrical section, and the tension sensor is located at the connection between the connecting rope and the fluid density adjustment counterweight ball. The data transmitting device is connected to the flow rate sensor and the tension sensor respectively.

[0029] The data processing and display unit is a host computer, which is connected to the data sending device.

[0030] The self-regulating float is a closed hollow polyvinyl chloride sphere with a diameter of 200 mm and a pore size of 22 mm. The fluid density adjusting counterweight ball is a hollow sphere with a 100 mm diameter polyvinyl chloride sealing port and a 22 mm aperture, and the sealing port can be opened to fill counterweight sand.

[0031] The working principle of this invention: This device uses the principle of flow velocity impact stress sensing and model calculation and model correction calculation to realize flow rate calculation. The high-velocity water flow passes through the large-diameter R1 inlet, impacts the side wall to form pressure, and contracts to be discharged from the small-diameter outlet R2. The length and diameter ratio of the L1 section with RI and R2 are designed according to different flow velocities to realize accurate measurement of pressure sensing. The L2 section is a self-floating horizontal stabilizing device. Its front part is a closed ring and its rear part is a strip that floats freely, realizing stable and balanced measurement of flow velocity impact pressure.

[0032] Force analysis was performed on the flow velocity data logger. The flow velocity data logger is subjected to the following forces: horizontal force and tension F in the rod connecting the tensile stress sensor. 拉 (F) 拉 (Value of the tension sensor), the impact force F of the water flow velocity on the flow velocity collector.冲 F 拉= F 冲 The forces acting vertically on the flow velocity collector are: gravity G and buoyancy F. 浮 Based on the balance of materials and varieties, F 浮= G.

[0033] The formula for calculating flow velocity is derived from the force equilibrium: G = F 浮 (Equation 1) F 冲 = F 拉 (Equation 2) t = ΔM (Equation 3) , In the formula: G -- gravity, unit: kg.m / m² F 浮 --Buoyancy, unit: kg.m / F 拉 --Sensor tensile force, unit: Kg.m / F 冲 --The impact force of the fluid on the horn sensor, in kg.m / t -- time, in seconds --Comprehensive correction coefficient, dimensionless ΔM -- Fluid impact mass, unit: kg --Fluid mixture bulk density (overall density), unit: Kg / --Inlet radius of the horn-shaped sensor, in meters. --Exit radius of the horn-shaped sensor, in meters. L1 -- Length of the horn segment of the horn sensor, in meters (m) --Flow velocity calculated at fluid measuring points, unit: m / s Pipeline pressure flow rate calculation: , --Pipe pressure flow rate, unit: m³ / s 3 / s --Pipe cross-sectional area, in m² 2 --Pipe radius, in meters --Average flow velocity in the pipe, in m / s --Flow velocity at the center of the pipe, in m / s --Flow velocity measured in pipelines, unit: m / s --Pipe flow damping coefficient (dimensionless, related to fluid viscosity, flow pressure, pipe wall properties, and pipe diameter) Calculation of free surface flow in rivers and canals: , --Free surface flow rate of river and canal pipelines, in m³ / s 3 / s --Fluid flow cross-sectional area, in m² 2 --Effective width of the river / canal, in meters. --Effective depth of river / canal flow, in meters. --Average flow velocity across river / canal cross-section, in m / s --Flow velocity in the center of the river or canal (usually the maximum), in m / s --Flow velocity is measured by a flow velocity sensor, with units of m / s. --Channel velocity correction factor (dimensionless, related to fluid viscosity, fluid width, fluid depth, channel characteristics, etc.) The device is installed at a suitable location in a pipe or open channel via a fixed sliding rod. For free surface flow (including rivers, open channels, and non-full-pipe pressure flow), a self-controlled float on the fixed sliding rod measures the liquid level and water depth parameters by rising and falling with the liquid level. Based on the fluid's specific gravity and viscosity, the weight ball is adjusted to control the flow velocity collector to be just submerged in the fluid. The fluid impacts the flow velocity collector, generating a pulling force. This pulling force is measured by a tension sensor and transmitted to the calculation system to calculate parameters such as fluid velocity and flow rate. The model calculation data is displayed on the system or remotely transmitted to the required data system. The data display system displays the following data (including but not limited to) parameters such as time, liquid level, flow velocity, and flow rate.

[0034] The fixed slide bar is characterized by its pull rod material being sturdy, durable, rust-proof, corrosion-resistant, and easy to purchase. It is recommended to choose a 20 mm diameter thin-walled stainless steel tube.

[0035] The function of the pipe core positioning pin is to accurately position the flow velocity collector on the inner wall of the pipe during pipeline flow velocity detection, and to control the flow velocity collector to be located in the center of the pipe. Its features are simple fixing and lightweight material. It is recommended to choose a PE pipe with a fixing pin diameter of 20 mm.

[0036] The function of the self-leveling float is to measure the liquid level in accordance with the scale of the fixed sliding rod. Its feature is that it floats along the fixed sliding rod as the liquid level rises and falls, and the buoyancy changes. It is recommended to choose a 200 mm diameter polyvinyl chloride sealed hollow ball with a 22 mm aperture.

[0037] The design of flow rate collectors with different specifications is set according to the range of fluid flow rates, including the design of D1, D2, L1, and L2 dimensions (especially the design parameters of (D1-D2) / L1 at different velocities) and material selection. For water environments, materials such as polyvinyl chloride, rubber cloth, tarpaulin, and polytetrafluoroethylene (PTFE) waterproof and breathable laminated fabrics can be selected.

[0038] The fluid density adjusting counterweight ball is characterized by adjusting the counterweight according to the fluid density to balance the buoyancy of the float, ensuring that the flow rate collector is just submerged in the fluid surface. It is fixed together with the buoyancy ball and moves up and down with the buoyancy ball along the mounting and fixing slide rod. It is recommended to choose a hollow ball with a diameter of 100 mm and a 22 mm aperture polyvinyl chloride sealing port. The sealing port can be opened to install an appropriate amount of counterweight sand.

[0039] Data transmission involves transmitting the data collected by the tension sensor to the data processing unit, which can use either wired or wireless transmission as needed. The data processing unit then uses the data obtained from the tension sensor to simulate and calculate parameters such as fluid density, pipe diameter, width, depth, and viscosity, accurately calculating and displaying the fluid flow rate and liquid level information.

[0040] This application provides a detailed description of a method and apparatus for continuous detection of surface fluid level and flow velocity. The descriptions of the above embodiments are merely illustrative of the method and its core concepts; furthermore, those skilled in the art will recognize that variations in specific implementation methods and application scope may occur based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0041] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0042] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0043] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0044] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A method for continuous detection of surface fluid level and velocity, characterized in that, The detection method specifically includes the following steps: S1) First, assemble the test equipment and place it in the fluid on the surface of the liquid to be measured. S2) The liquid level and water depth data of the fluid on the surface of the liquid to be measured are obtained by adjusting the testing equipment. Then, according to the specific gravity and viscosity of the fluid, the flow rate collector of the testing equipment is placed below the fluid surface, so that the fluid passes through the flow rate collector and impacts to generate tensile force. S3) Real-time acquisition of liquid level and water depth data of the fluid on the surface to be measured, as well as tensile force data, and calculation of liquid level, flow velocity and flow rate parameters of the fluid on the surface to be measured through the model; The specific steps are as follows: S3.1) Based on the collected tension F 拉 Impact force F 冲 And the forces acting in the vertical direction, the gravity G acting on the flow velocity collector, and the buoyancy F of the flow velocity collector. 浮 Calculate the flow velocity at the fluid measuring point. The formula is as follows: In the formula: F 冲 The force exerted by the fluid on the velocity collector is expressed in kg·m / s. , The comprehensive correction coefficient is dimensionless. This refers to the bulk density of the fluid mixture, expressed in kg / kWh. , R1 is the inlet radius of the horn sensor, in meters; R2 is the outlet radius of the horn sensor, in meters; and L1 is the length of the horn segment of the horn sensor, in meters. The velocity at the fluid measuring point is expressed in m / s. S3.2) Obtain the fluid velocity at the measuring point based on S3.1). Substitute the values ​​into the flow calculation model to obtain the flow rate; S3.2.1) When the fluid is inside the pipe, the flow rate calculation model is as follows: ， In the formula: This refers to the flow rate under pressure in the pipeline, expressed in cubic meters per second (m³). 3 / s, This refers to the cross-sectional area of ​​the pipe, in meters (m²). 2 , The radius of the pipe is in meters (m). The average flow velocity in the pipe is expressed in m / s. The fluid velocity at the measuring point obtained from step S3.1 is expressed in m / s. is the pipe flow damping coefficient, which is dimensionless; S3.2.2) When the fluid is in a river or canal, the flow rate calculation model is as follows: ， In the formula, The cross-sectional area for fluid flow is expressed in m². 2 , The effective width of the canal for flow, in meters. The effective depth of the river / canal flow, expressed in meters (m). The average flow velocity across the river / canal cross-section is expressed in m / s. The fluid velocity at the measuring point obtained from step S3.1 is expressed in m / s. This is a dimensionless correction factor for river and canal velocity.

2. A detection apparatus for implementing the detection method of claim 1, characterized in that, The detection device includes a measurement unit, a data acquisition and transmission unit, and a data processing and display unit; The measuring unit is used to measure the upper surface of the fluid on the surface of the liquid being measured and to receive the real-time impact force of the fluid on the surface of the liquid. The data acquisition and transmission unit is used to acquire measurement data from the measurement unit in real time and upload the acquired data. The data processing and display unit is used to analyze and process the received real-time data to obtain the velocity and flow rate of the fluid on the liquid surface to be measured.

3. The detection device according to claim 2, characterized in that, The measuring unit includes: a fixed slide bar, a tube positioning pin, a liquid level self-control float, a flow rate collector, and a fluid density adjustment counterweight ball; The fixed slide rod is vertically arranged, and the tube core positioning pin is horizontally movably arranged on the fixed slide rod; The liquid level self-control float is movably mounted on the fixed slide bar and is located at the lower end of the tube core positioning pin. The fluid density adjusting counterweight ball is movably mounted on the fixed slide bar located at the lower end of the liquid level self-control float ball, and the flow rate collector is connected to the fluid density adjusting counterweight ball via a connecting rope.

4. The detection device according to claim 3, characterized in that, The flow rate collector includes a flared section and a cylindrical section; The open end of the flared section is the water inlet, and the narrowed end is connected to the cylindrical section.

5. The detection device according to claim 4, characterized in that, The length of the flared section is greater than or equal to the length of the cylindrical section; Furthermore, the diameter of the cylindrical section is less than 1 / 2 the diameter of the flared section.

6. The detection device according to claim 4, characterized in that, The data acquisition and transmission unit includes a data transmission device, a flow rate sensor, and a tension sensor; The flow rate sensor is located inside the cylindrical section, and the tension sensor is located at the connection between the connecting rope and the fluid density adjustment counterweight ball. The data transmitting device is connected to the flow rate sensor and the tension sensor respectively.

7. The detection device according to claim 6, characterized in that, The data processing and display unit is a host computer, which is connected to the data sending device.

8. The detection device according to claim 3, characterized in that, The self-regulating liquid level float is a closed hollow sphere made of polyvinyl chloride. The fluid density adjusting counterweight ball is a hollow sphere with a sealed polyvinyl chloride port, and the sealed port can be opened to fill counterweight sand.

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