Non-full pipe flow measuring instrument and measuring method

Abstract

The invention discloses a non-full pipe flow measuring instrument and measuring method.The non-full pipe flow measuring instrument comprises a protective shell, a flow computer, a phase array radar assembly, a high-frequency radar assembly and an attitude sensor module are arranged in the protective shell, and the phase array radar assembly, the high-frequency radar assembly and the attitude sensor module are all connected with the flow computer; the phase array radar assembly is obliquely arranged along the flow direction of fluid, and the inclination angle is 30-70 degrees; the high-frequency radar assembly is arranged at a position of + / -15 degrees right above the measured fluid; and the attitude sensor module is arranged in the flow sensor and is connected with the flow sensor. The measuring instrument can accurately measure the flow of the non-full pipe under various complex working conditions, the measuring precision and reliability are improved, and the requirements for installation and measuring conditions are reduced.

Description

Technical Field

[0001] This invention belongs to the field of flow measurement technology, specifically relating to a non-full pipe flow measuring instrument and measurement method. Background Technology

[0002] Flow measurement plays a crucial role in numerous industrial and daily life scenarios. Currently, most flow meters commonly used in the industrial field measure flow under full-pipe conditions; however, non-full-pipe situations are extremely common in real life. For example, in water conservancy projects, the monitoring and early warning of water flow in rivers, canals, and dams often involve non-full-pipe flow; in industrial production, the monitoring of wastewater and sewage discharge in factories often involves non-full-pipe flow; and in the mining and petroleum industries, the transportation of slurry in coal mining, the circulation of drilling mud, and the transportation of water-containing crude oil from oilfields all require non-full-pipe flow measurement.

[0003] Existing non-full-pipe flow meters, such as open channel flow meters, have extremely stringent requirements for installation and measurement conditions. Furthermore, non-full-pipe measurement conditions involve numerous complex factors. Significant liquid level fluctuations make measurement data unstable; diverse flow channel cross-sections, including circular, square, and trapezoidal shapes, increase the difficulty of measurement; the wide range of pipe installation tilt angles further affects measurement accuracy; and ultrasonic signals are easily interfered with by external factors, leading to significant deviations in measurement results. In addition, the medium often contains air bubbles and particulate matter, and its physical properties, viscosity, water content, temperature, and pressure parameters also vary considerably. The combined effect of these factors means that existing common measurement methods either cannot be installed and used normally under these complex conditions or have excessively high measurement errors, failing to meet practical measurement needs. Therefore, developing a new type of non-full-pipe flow measurement device to solve these problems is urgently needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a non-full pipe flow meter and measurement method to overcome the shortcomings of existing non-full pipe flow measurement technology. The meter can accurately measure non-full pipe flow under various complex working conditions, improve measurement accuracy and reliability, and reduce the requirements for installation and measurement conditions.

[0005] The technical solution adopted in this invention is: a non-full pipe flow meter, including a protective shell, inside which are a flow computer, a phased array radar assembly, a high-frequency radar assembly and an attitude sensor module, all of which are connected to the flow computer.

[0006] The phased array radar assembly is tilted along the fluid flow direction with a tilt angle of 30°-70°.

[0007] The high-frequency radar assembly is positioned at a position ±15° directly above the fluid being measured.

[0008] The attitude sensor module is located inside the flow sensor and is connected to the flow sensor.

[0009] In one embodiment, the traffic computer includes a main control module, a data acquisition module, a communication conversion module, an external isolation module, a Bluetooth module, and a WIFI module;

[0010] The main control module is connected to the data acquisition module, communication conversion module, external isolation module, Bluetooth module and WIFI module, and is used to receive information input from the data acquisition module, communication conversion module and external isolation module, and to communicate with external devices through the Bluetooth module and WIFI module;

[0011] The data acquisition module is connected to the main control module, the phased array radar assembly, the high-frequency radar assembly, and the attitude sensor module, and is used to receive information output by the phased array radar assembly, the high-frequency radar assembly, and the attitude sensor module and output the received information to the main control module.

[0012] The communication conversion module is connected to the main control module and is used for unifying internal and external communication protocols;

[0013] The external isolation module is connected to the main control module and is used for isolation and protection between the internal circuit of the measuring instrument and the external access channel;

[0014] The Bluetooth module and the WIFI module are respectively connected to the main control module for communication with external devices.

[0015] In one embodiment, the phased array radar assembly includes a phased array radar module and a phased array radar lens connected to the phased array radar module, and the phased array radar module is connected to a traffic computer.

[0016] In one embodiment, the high-frequency radar assembly includes a high-frequency radar module and a spherical lens connected to the high-frequency radar module, the high-frequency radar module being connected to a traffic computer.

[0017] In one embodiment, the protective housing further includes a display and human-computer interaction module as well as an external power supply and communication connection module.

[0018] The display and human-computer interaction module is connected to the traffic computer and is used to display the data output by the traffic computer and interact with the traffic computer.

[0019] The external power supply and communication connection module is connected to the traffic computer and is used for input of external power supply and connection.

[0020] In one embodiment, a mounting bracket is also included, which is disposed on the outside of the housing and connected to the flow channel being tested.

[0021] This invention also discloses a measurement method for a non-full pipe flow meter, which is implemented using the aforementioned non-full pipe flow meter and includes the following steps:

[0022] Step 1: Based on the condition of the flow channel being measured, install the measuring instrument above the flow channel using the mounting bracket, ensuring the angle between the phase array radar component and the high frequency radar component, and proceed to Step 2.

[0023] Step 2: The phased array radar assembly, high-frequency radar assembly, and attitude sensor module are operational, proceeding to steps 3, 4, and 5 respectively;

[0024] Step 3: The phased array radar module of the phased array radar assembly emits radar waves. After passing through the phased array radar lens, the radar waves come into contact with the fluid inside the flow channel being measured. The reflected radar waves are received by the phased array radar module after passing through the phased array radar lens, and the fluid flow velocity is obtained. The phased array radar module outputs the obtained fluid flow velocity information to the flow computer in real time, and then proceeds to step 6.

[0025] Step 4: The high-frequency radar module of the high-frequency radar assembly emits radar waves. After passing through a spherical lens, the radar waves come into contact with the fluid inside the flow channel being measured. The reflected radar waves are received by the high-frequency radar module after passing through the spherical lens, and the liquid level height is obtained. The high-frequency radar module outputs the obtained liquid level height information to the flow computer in real time, and then proceeds to step 6.

[0026] Step 5: The attitude sensor module measures the channel tilt angle and outputs the measured channel tilt angle information to the flow computer, then proceeds to step 6;

[0027] Step 6: The flow computer calculates the wetted cross-sectional area of ​​the fluid based on the cross-sectional type of the flow channel being measured, and then proceeds to Step 7;

[0028] Step 7: Calculate the theoretical flow rate using the fluid velocity obtained in Step 3, the channel inclination angle measured in Step 5, and the fluid wetted cross-section calculated in Step 6. The formula for calculating the theoretical flow rate is:

[0029] Q s =ν*S*cos(a) / Δt,

[0030] Among them, Q S Given the theoretical flow rate, v is the fluid velocity, S is the wetted cross-sectional area of ​​the fluid, a is the channel inclination angle, and Δt is the unit time, proceed to step 8.

[0031] Step 8: Calculate the final flow rate based on the theoretical flow rate obtained in Step 7. The formula for calculating the final flow rate is:

[0032] Q = F(k) * K * Q s ,

[0033] Where Q is the final flow rate, Q S F(k) represents the theoretical flow rate, F(k) represents the dynamic flow database, and K represents the field flow correction coefficient.

[0034] In one embodiment, the fluid wet cross-sectional area mentioned in step 6 is calculated by the measured flow channel cross-section type and the liquid level height obtained in step 4.

[0035] In one embodiment, in step 8, the flow dynamic database F(k) is established based on the calibration process, and the coefficient k in the database is determined by comparing the actual on-site measurement data with the theoretical flow.

[0036] In one embodiment, in step 8, the determination of the on-site flow correction coefficient K is based on the actual on-site working conditions. The flow is corrected by collecting and analyzing data.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. High-precision measurement: Compared to ultrasonic and other measurement principles, this invention uses a combination of phased array radar antennas and high-frequency radar antennas for flow measurement, which can more accurately acquire information on fluid surface velocity and liquid level (fluid thickness), thus resulting in higher flow measurement accuracy. The high-precision velocity measurement of the phased array radar module and the high-precision liquid level (fluid thickness) measurement of the high-frequency radar module, along with the precise processing of various data and the application of complex algorithm models by the flow computer, ensure the accuracy of the measurement results.

[0039] 2. Non-contact measurement: Non-contact measurement avoids direct contact between the measuring instrument and the measured medium, reducing instrument wear and corrosion, extending instrument lifespan, and preventing interference from contact. The advantages of non-contact measurement are even more pronounced in conditions containing corrosive media or under high temperature and pressure.

[0040] 3. Strong anti-interference capability: Due to the excellent propagation characteristics of electromagnetic waves, this measuring instrument boasts high reliability, high penetration, and superior anti-interference capability. Especially under harsh conditions such as the presence of deposits on the emission source, high temperature, high humidity, high pressure, and high medium density, it can still provide accurate and reliable measurement results. Electromagnetic waves are unaffected by factors such as bubbles and particles in the medium, enabling stable signal propagation and reception, thus ensuring the accuracy and reliability of the measurement.

[0041] 4. High adaptability: The measuring instrument of this invention can adapt to various flow channel cross-sectional shapes (circular, square, trapezoidal, etc.) and different installation tilt angles, and can correct the flow rate according to the actual working conditions on site, demonstrating strong adaptability. Through built-in multiple cross-sectional calculation models and non-full-pipe coupling algorithm models, it can accurately handle various complex flow channel conditions. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of one possible structure of the present invention;

[0043] Figure 2 This is a schematic diagram of one possible structure of the present invention;

[0044] Figure 3 This is a schematic diagram illustrating the installation of the present invention in one of the following environments: horizontal pipes, canals, etc.

[0045] Figure 4 This is a schematic diagram illustrating the installation of the present invention in one of the following environments: horizontal pipes, canals, etc.

[0046] Figure 5 This is a schematic diagram of the installation of the inclined pipe of the present invention;

[0047] Figure 6 A circular pipe cross-section model;

[0048] Figure 7 A square pipe cross-section model;

[0049] Figure 8 A cross-sectional model of a three-dimensional pipe;

[0050] Figure 9 This is a cross-sectional model of an irregularly shaped pipe.

[0051] Figure 10 This is a cross-sectional model of an irregularly shaped pipe.

[0052] In the diagram: 1. Protective housing; 2. Flow computer; 3. Phased array radar assembly; 4. High-frequency radar assembly; 5. Attitude sensor module; 6. Display and human-machine interaction module; 7. External power supply and communication connection module; 8. Mounting bracket; 201. Data acquisition module; 202. Communication conversion module; 203. External isolation module; 204. Bluetooth module; 205. WIFI module; 206. Main control module; 301. Phased array radar module; 302. Phased array radar lens; 401. High-frequency radar module; 402. Spherical lens. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0054] like Figure 1 and Figure 2 As shown, a non-full pipe flow meter includes a protective housing 1. Inside the protective housing 1 are a flow computer 2, a phased array radar assembly 3, a high-frequency radar assembly 4, and an attitude sensor module 5. The phased array radar assembly 3, the high-frequency radar assembly 4, and the attitude sensor module 5 are all connected to the flow computer 2.

[0055] The phased array radar component 3 is tilted along the fluid flow direction and the tilt angle is 30°-70°.

[0056] The high-frequency radar component 4 is positioned at a position ±15° directly above the fluid being measured.

[0057] The attitude sensor module 5 is located inside the flow sensor and connected to the flow sensor.

[0058] In this embodiment, the traffic computer 2 includes a main control module 206, a data acquisition module 201, a communication conversion module 202, an external isolation module 203, a Bluetooth module 204, and a WIFI module 205;

[0059] The main control module 206 is connected to the data acquisition module 201, the communication conversion module 202, the external isolation module 203, the Bluetooth module 204, and the WIFI module 205. It is used to receive information input from the data acquisition module 201, the communication conversion module 202, and the external isolation module 203, and to communicate with external devices through the Bluetooth module 204 and the WIFI module 205.

[0060] The data acquisition module 201 is connected to the main control module 206, the phased array radar component 3, the high-frequency radar component 4 and the attitude sensor module 5, and is used to receive the information output by the phased array radar component 3, the high-frequency radar component 4 and the attitude sensor module 5 and output the received information to the main control module 206.

[0061] The communication conversion module 202 is connected to the main control module 206 and is used for unifying internal and external communication protocols;

[0062] The external isolation module 203 is connected to the main control module 206 and is used for isolation and protection between the internal circuit of the measuring instrument and the external access channel.

[0063] The Bluetooth module 204 and the WIFI module 205 are respectively connected to the main control module 206 for communication with external devices.

[0064] In this embodiment, the phased array radar assembly 3 includes a phased array radar module 301 and a phased array radar lens 302 connected to the phased array radar module. The phased array radar module is connected to the traffic computer 2.

[0065] In this embodiment, the high-frequency radar component 4 includes a high-frequency radar module 401 and a spherical lens 402 connected to the high-frequency radar module 401. The high-frequency radar module 401 is connected to the traffic computer 2.

[0066] In this embodiment, the protective shell 1 is further provided with a display and human-computer interaction module 6 and an external power supply and communication connection module 7;

[0067] The display and human-computer interaction module 6 is connected to the traffic computer 2 and is used to display the data output by the traffic computer 2 and interact with the traffic computer 2.

[0068] The external power supply and communication connection module 7 is connected to the flow computer 2 and is used for input of external power supply and connection.

[0069] In this embodiment, a mounting bracket 8 is also included, which is disposed on the outside of the housing and connected to the flow channel to be tested.

[0070] like Figures 3-5 As shown, the present invention also discloses a measurement method for a non-full pipe flow meter, which is implemented using the aforementioned non-full pipe flow meter and includes the following steps:

[0071] Step 1: Based on the condition of the flow channel being measured, install the measuring instrument above the flow channel being measured using the mounting bracket 8, ensuring the angle between the phase array radar component 3 and the high frequency radar component 4, and proceed to Step 2.

[0072] Step 2: Phased array radar module 3, high-frequency radar module 4 and attitude sensor module 5 are activated, respectively proceeding to steps 3, 4 and 5.

[0073] Step 3: The phase array radar module 301 of the phase array radar assembly 3 emits radar waves. After passing through the phase array radar lens 302, the radar waves come into contact with the fluid inside the flow channel being measured. After being reflected, the radar waves are received by the phase array radar module after passing through the phase array radar lens 302 and the fluid flow velocity is obtained. The phase array radar module 301 outputs the obtained fluid flow velocity information to the flow computer 2 in real time, and then proceeds to step 6.

[0074] Step 4: The high-frequency radar module 401 of the high-frequency radar component 4 emits radar waves. After passing through the spherical lens 402, the radar waves come into contact with the fluid inside the flow channel being measured. The reflected radar waves are received by the high-frequency radar module 401 after passing through the spherical lens 402, and the liquid level height is obtained. The high-frequency radar module 401 outputs the obtained liquid level height information to the flow computer 2 in real time, and then proceeds to step 6.

[0075] Step 5: The attitude sensor module 5 measures the channel tilt angle and outputs the measured channel tilt angle information to the flow computer 2, then proceeds to step 6;

[0076] Step 6: The flow computer 2 calculates the wet cross-sectional area of ​​the fluid according to the cross-sectional type of the flow channel being measured, and then proceeds to step 7;

[0077] Step 7: Calculate the theoretical flow rate using the fluid velocity obtained in Step 3, the channel inclination angle measured in Step 5, and the fluid wetted cross-section calculated in Step 6. The formula for calculating the theoretical flow rate is:

[0078] Q s =ν*S*cos(a) / Δt,

[0079] Among them, Q S Given the theoretical flow rate, v is the fluid velocity, S is the wetted cross-sectional area of ​​the fluid, a is the channel inclination angle, and Δt is the unit time, proceed to step 8.

[0080] Step 8: Calculate the final flow rate based on the theoretical flow rate obtained in Step 7. The formula for calculating the final flow rate is:

[0081] Q = F(k) * K * Q s ,

[0082] Where Q is the final flow rate, Q S F(k) represents the theoretical flow rate, F(k) represents the dynamic flow database, and K represents the field flow correction coefficient.

[0083] In this embodiment, the wet cross-sectional area of ​​the fluid mentioned in step 6 is calculated by the cross-sectional type of the measured flow channel and the liquid level height obtained in step 4.

[0084] In this embodiment, in step 8, the flow dynamic database F(k) is established based on the calibration process, and the coefficient k in the database is determined by comparing the actual on-site measurement data with the theoretical flow.

[0085] In this embodiment, in step 8, the determination of the on-site flow correction coefficient K is based on the actual on-site working conditions. The flow is corrected by collecting and analyzing data.

[0086] The specific functions of the main components of the non-full pipe flow meter involved in this invention are as follows:

[0087] 1. Phased array radar module 301 and phased array radar lens 302: Used for surface flow velocity measurement. The thickness, focal length, and structure of the phased array radar lens 302 need to be determined through comprehensive calculation and simulation based on antenna signal power, detection distance, measurement range, and material absorption rate. The lens material should be PEEK / POE or similar materials with good thermal stability, anti-adhesion, corrosion resistance, deformation resistance, high temperature resistance, and machinability. The phased array radar module has a built-in flow velocity calculation model, with the flow velocity represented by , achieving an accuracy of ±0.01 m / s and a resolution better than 0.002 m / s. The measurement results are digitally communicated with the flow computer 2 via a serial port. The phased array radar module and its matching lens antenna are installed at an angle of 35°-70° towards the flow direction. This installation method can more effectively capture the flow velocity information of the fluid surface.

[0088] 2. High-frequency radar module 401 and spherical lens 402: Responsible for measuring liquid level (fluid thickness). The structure and focal length of the spherical lens 402 need to be determined through comprehensive calculation and simulation based on antenna signal power, detection distance, measurement range, and material absorption rate. The lens material should be PEEK / POE or similar materials with good thermal stability, anti-adhesion, corrosion resistance, deformation resistance, high temperature resistance, and machinability. The high-frequency radar module 401 has a built-in liquid level calculation model, with the liquid level height represented by h, an accuracy of ±1mm, and a resolution better than 0.2mm. The measurement results are also digitally communicated with the flow computer 2 via a serial port. The high-frequency radar module 401 and spherical lens 402 are located directly above the fluid being measured, enabling accurate measurement of liquid level (fluid thickness).

[0089] 3. Attitude sensor module 5: Embedded in the flow computer 2, it has a built-in six-axis measurement parameter calculation model for monitoring vibration status and flow channel horizontal angle. The installation tilt angle is represented by 'a', with an angle accuracy error of ±1° and a resolution better than ±0.5°. The measurement results are digitally communicated with the flow computer 2 via a serial port.

[0090] 4. Flow Computer 2: This is a complete integrated circuit unit with functions including data acquisition, processing, calculation, display, communication, remote transmission, and human-computer interaction. It can acquire and process all data, model the flow channel cross-section characteristics, combine the changes in medium surface tension and edge transition characteristics, and then realize the final flow measurement through a built-in non-full-pipe coupling algorithm model.

[0091] 5. Protective Housing 1: The protective housing 1 is made of metal (such as stainless steel, aluminum alloy, etc.) or plastic material with good thermal stability, anti-adhesion, anti-corrosion, anti-deformation, high temperature resistance and machinability. The protective housing 1 has waterproof, dustproof and explosion-proof properties, and can meet the intrinsic safety or explosion-proof, IP68 high protection level design, which can effectively protect the internal components to work normally in harsh environments.

[0092] 6. Mounting bracket 8: Used to fix the above components in a suitable position directly above the flow channel being measured. The measuring instrument can be designed as an integrated unit or a modular unit according to actual needs.

[0093] Measurement principle and calculation model

[0094] 1. Flow velocity measurement principle and calculation model

[0095] Phased array radar modules calculate the flow velocity at the fluid surface by transmitting and receiving reflected radar wave signals, based on the Doppler effect principle of radar waves. As the fluid flows, the frequency of the reflected radar wave signal changes. By calculating the frequency change and combining it with known radar transmission signal parameters and relevant algorithms, the fluid surface velocity *v* can be determined. The specific calculation model is as follows:

[0096] v = Δf / (f0 * 2 * c * cosθ),

[0097] Where v is the fluid velocity, Δf is the change in radar wave frequency, f0 is the original frequency of the radar wave, c is the speed of light, and θ is the angle between the radar wave emitted by the phased array radar module and the direction of fluid flow (in this invention, since the phased array radar module and its matching lens antenna are installed at an angle facing the flow, θ is in the range of 30°-70°).

[0098] 2. Measurement principle and calculation model of liquid level height (fluid thickness)

[0099] The high-frequency radar module 401 calculates the liquid level height (fluid thickness) by measuring the time difference between the transmitted radar wave and the radar wave reflected back from the liquid surface. The specific calculation model is as follows:

[0100] h' = c * t / 2,

[0101] h = L - h',

[0102] Where h is the liquid level (fluid thickness), h' is the measurement height, L is the distance from the sensor to the bottom of the measuring tube, t is the round-trip time of the radar wave, and c is the speed of light.

[0103] 3. Attitude monitoring principle and calculation model

[0104] The attitude sensor module 5 monitors the tilt angle of the measuring instrument through its built-in accelerometer and gyroscope. The specific calculation model is as follows:

[0105] a = arctan(ay / az);

[0106] Where 'a' is the tilt angle, and 'ay' and 'az' are the accelerometer measurements on the Y and Z axes, respectively.

[0107] 4. Calculation model for wetted cross-sectional area of ​​fluid

[0108] Taking circular pipes, square pipes, trapezoidal pipes, and irregularly shaped pipes as examples, the calculation model is as follows:

[0109] like Figure 6 As shown, the calculation method for the wetted cross-sectional area of ​​a circular pipe is as follows:

[0110] Given the radius R of the circular pipe and the liquid level (fluid thickness) h, the formula for calculating the wetted cross-sectional area S of the fluid is:

[0111] When h≤R:

[0112]

[0113] When h > R:

[0114]

[0115] like Figure 7 As shown, the calculation method for the wetted cross-sectional area of ​​a square pipe is as follows:

[0116] If the side length of the square pipe is d and the liquid level (fluid thickness) is h, then the wetted cross-sectional area of ​​the fluid is:

[0117] S = d * h.

[0118] like Figure 8 As shown, the calculation method for the wetted cross-sectional area of ​​a trapezoidal pipe is as follows:

[0119] Let the lower base of the trapezoid be b1, the upper base be b2, the height be H, and the liquid surface height (fluid thickness) be h. First, calculate the length of the upper base of the trapezoid at the liquid surface using the principle of similar triangles: b1' = b1 + (b2 - b1) * h / H. Then, calculate the wetted cross-sectional area of ​​the fluid using the trapezoid area formula: S = (b1' + b2) * h / 2.

[0120] like Figure 9 As shown, the calculation method for the wet cross-sectional area of ​​the irregularly shaped pipe 1 is as follows:

[0121] Given that the lower part of the irregularly shaped pipe is semi-circular with radius R, and the upper part is rectangular, with a liquid level height (fluid thickness) h, the formula for calculating the wetted cross-sectional area S of the fluid is:

[0122] When h≤R:

[0123]

[0124] When h > R:

[0125]

[0126] like Figure 10As shown, the calculation method for the wetted cross-sectional area of ​​the irregularly shaped pipe 2 is as follows:

[0127] Given that the lower part of the irregularly shaped pipe is semi-circular with a missing arch at the bottom, the radius of the semicircle is R, the height of the missing arch is Δh, the upper part is rectangular, the liquid level (fluid thickness) is h, and the formula for calculating the wetted cross-sectional area S of the fluid is:

[0128] The missing arc-shaped area is a constant value, S'.

[0129]

[0130] When h≤R:

[0131]

[0132] When h > R:

[0133]

[0134] 5. Flow Calculation Model

[0135] The flow computer 2 calculates the flow rate using the following calculation model, based on the fluid velocity v measured by the phased array radar module, the liquid level height (fluid thickness) h measured by the high-frequency radar module 401, and the tilt angle a measured by the attitude sensor module 5, combined with the cross-sectional area characteristics of the flow channel:

[0136] Q = F(k) * K * Q s ;

[0137] Where Q is the final flow rate, Q S F(k) represents the theoretical flow rate, F(k) represents the dynamic flow database, and K represents the field flow correction coefficient.

[0138] Theoretical flow Q S The calculation model is as follows:

[0139] Q S = v*S*cos(a) / Δt;

[0140] Where v is the fluid velocity, S is the wetted cross-sectional area of ​​the fluid, calculated based on the characteristics of the flow channel cross-section (circular, square, trapezoidal, etc.), and a is the flow channel inclination angle. Considering that the inclination of the flow channel will affect the flow rate, it is corrected by multiplying by cos(a) / Δt.

[0141] The establishment of the flow dynamic database F(k) is based on multi-parameter coupling and actual calibration processes (including parameters such as pipe type, flow rate, liquid surface thickness, installation angle, medium viscosity, and flow velocity). The coefficient k in the dynamic database is determined by comparing actual field measurement data with theoretical flow rates. Different flow channel cross-sectional shapes, medium characteristics, and measurement parameters all affect the value of F(k). Therefore, extensive experimental calibration is required for various possible operating conditions to establish an accurate flow dynamic database.

[0142] The determination of the on-site flow correction factor K is based on the actual on-site operating conditions. Flow rate is corrected by collecting and analyzing data. For example, when the medium contains a large number of air bubbles or particles, it will affect the fluid's flow characteristics, thus requiring adjustment of the value of K. Similarly, when the viscosity of the measured medium is high, it will affect the flow rate, requiring correction using K. High surface roughness of the flow channel will also affect the flow rate, necessitating correction using K.

[0143] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A non-full pipe flow meter, characterized in that: The device includes a protective housing (1), inside which are a flow computer (2), a phased array radar assembly (3), a high-frequency radar assembly (4), and an attitude sensor module (5), all of which are connected to the flow computer (2). The phased array radar component (3) is tilted along the fluid flow direction and the tilt angle is 30°-70°; The high-frequency radar component (4) is positioned at a position ±15° directly above the fluid being measured; The attitude sensor module (5) is located inside the flow sensor and connected to the flow sensor.

2. The non-full pipe flow meter according to claim 1, characterized in that: The traffic computer (2) includes a main control module (206), a data acquisition module (201), a communication conversion module (202), an external isolation module (203), a Bluetooth module (204), and a WIFI module (205); The main control module (206) is connected to the data acquisition module (201), the communication conversion module (202), the external isolation module (203), the Bluetooth module (204), and the WIFI module (205), and is used to receive information input from the data acquisition module (201), the communication conversion module (202), and the external isolation module (203), and to communicate with external devices through the Bluetooth module (204) and the WIFI module (205); The data acquisition module (201) is connected to the main control module (206), the phased array radar assembly (3), the high-frequency radar assembly (4) and the attitude sensor module (5), and is used to receive the information output by the phased array radar assembly (3), the high-frequency radar assembly (4) and the attitude sensor module (5) and output the received information to the main control module (206). The communication conversion module (202) is connected to the main control module (206) and is used for unifying internal and external communication protocols; The external isolation module (203) is connected to the main control module (206) and is used for isolation and protection between the internal circuit of the measuring instrument and the external access channel; The Bluetooth module (204) and the WIFI module (205) are respectively connected to the main control module (206) for communication with external devices.

3. A non-full pipe flow meter according to claim 2, characterized in that: The phased array radar assembly (3) includes a phased array radar module and a phased array radar lens (302) connected to the phased array radar module (301). The phased array radar module is connected to a traffic computer (2).

4. A non-full pipe flow meter according to claim 2, characterized in that: The high-frequency radar assembly (4) includes a high-frequency radar module (401) and a spherical lens (402) connected to the high-frequency radar module (401). The high-frequency radar module (401) is connected to the traffic computer (2).

5. A non-full pipe flow meter according to claim 1, characterized in that: The protective shell (1) is also equipped with a display and human-computer interaction module (6) and an external power supply and communication connection module (7); The display and human-computer interaction module (6) is connected to the traffic computer (2) and is used to display the data output by the traffic computer (2) and interact with the traffic computer (2); The external power supply and communication connection module (7) is connected to the flow computer (2) and is used for input of external power supply and connection.

6. A non-full pipe flow meter according to claim 1, characterized in that: It also includes a mounting bracket (8), which is disposed on the outside of the housing and connected to the flow channel being tested.

7. A measurement method for a non-full pipe flow meter, characterized in that: It is achieved by the non-full pipe flow meter according to any one of claims 1-6, which includes the following steps: Step 1: According to the condition of the flow channel to be measured, install the measuring instrument above the flow channel to be measured using the mounting bracket (8), ensuring the angle between the phase array radar component (3) and the high frequency radar component (4), and proceed to Step 2. Step 2: The phased array radar assembly (3), the high-frequency radar assembly (4), and the attitude sensor module (5) operate, respectively entering steps 3, 4, and 5; Step 3: The phased array radar module of the phased array radar assembly (3) emits radar waves. After passing through the phased array radar lens (302), the radar waves come into contact with the fluid inside the flow channel being measured. After being reflected, the radar waves are received by the phased array radar module after passing through the phased array radar lens (302) and the fluid flow rate is obtained. The phased array radar module outputs the obtained fluid flow rate information to the flow computer (2) in real time and proceeds to step 6. Step 4: The high-frequency radar module (401) of the high-frequency radar component (4) emits radar waves. After passing through the spherical lens (402), the radar waves come into contact with the fluid inside the flow channel being measured. After being reflected, the radar waves are received by the high-frequency radar module (401) after passing through the spherical lens (402) and the liquid level height is obtained. The high-frequency radar module (401) outputs the obtained liquid level height information to the flow computer (2) in real time, and proceeds to step 6. Step 5: The attitude sensor module (5) measures the channel tilt angle and outputs the measured channel tilt angle information to the flow computer (2), then proceeds to step 6; Step 6: The flow computer (2) calculates the wet cross-sectional area of ​​the fluid according to the cross-sectional type of the flow channel being measured, and proceeds to step 7; Step 7: Calculate the theoretical flow rate using the fluid velocity obtained in Step 3, the channel inclination angle measured in Step 5, and the fluid wetted cross-section calculated in Step 6. The formula for calculating the theoretical flow rate is: Q s =ν*S*cos(a) / Δt, Among them, Q S Given the theoretical flow rate, v is the fluid velocity, S is the wetted cross-sectional area of ​​the fluid, a is the channel inclination angle, and Δt is the unit time, proceed to step 8. Step 8: Calculate the final flow rate based on the theoretical flow rate obtained in Step 7. The formula for calculating the final flow rate is: Q=F(k)*K*Q s , Where Q is the final flow rate, Q S F(k) represents the theoretical flow rate, F(k) represents the dynamic flow database, and K represents the field flow correction coefficient.

8. The measurement method of a non-full pipe flow meter according to claim 7, characterized in that: The wet cross-sectional area of ​​the fluid mentioned in step 6 is calculated by the cross-sectional type of the flow channel being measured and the liquid level height obtained in step 4.

9. The measurement method of a non-full pipe flow meter according to claim 7, characterized in that: In step 8, the flow dynamic database F(k) is established based on the calibration process. The coefficient k in the database is determined by comparing the actual on-site measurement data with the theoretical flow.

10. The measurement method of a non-full pipe flow meter according to claim 7, characterized in that: In step 8, the determination of the on-site flow correction coefficient K is based on the actual on-site working conditions. The flow is corrected by collecting and analyzing data.

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