Large-pipe-diameter flow measuring device

Abstract

The invention discloses a large-pipe-diameter flow measuring device which comprises a rectifying grating, a reducing branch pipe, a stop valve assembly and a flow meter, and the rectifying grating is arranged on the inner wall of a main pipe; the inlet section of the reducing branch pipe extends into the main pipe, is arranged at the center of the main pipe and is positioned at the downstream position of the rectifying grid, the outlet section of the reducing branch pipe is communicated with the main pipe again, and the pipe orifice of the inlet section of the reducing branch pipe is of a reducing structure; the stop valve assembly is arranged in the reducing branch pipe; the flow meter is arranged at the middle section of the reducing branch pipe, a data processing module is arranged in the flow meter, and the data processing module can calculate the fluid flow in the main pipe through the measured flow in the reducing branch pipe by combining parameters such as the pipe diameter proportional relation of the main pipe and the reducing branch pipe. The flow state of fluid is effectively improved, and the precision of flow measurement in the whole large-pipe-diameter main pipe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of large-diameter fluid flow measurement equipment, in particular to a large-diameter flow measurement device. Background Art

[0002] Accurately measuring fluid flow within large-diameter pipes is often necessary in numerous fields, including industrial production and water conservancy projects. However, internal airflow separation or distorted velocity distribution in large-diameter pipes can lead to uneven flow at the outlet. Furthermore, installation and maintenance of large-diameter pipes are relatively complex. Flow meter installation requires adequate space and a suitable mounting location to ensure accurate and stable measurements, and ensure sufficient straight pipe length.

[0003] Traditional flow measurement methods often struggle to meet the accuracy requirements of large-diameter pipes. Consequently, existing methods involve creating a branch pipe on one side of the main pipe, measuring the branch flow rate with a flowmeter installed in the branch pipe, and then simulating the main pipe flow rate using a data processing module configured with the flowmeter. However, due to the presence of a boundary layer, the fluid velocity within the main pipe to be measured is uneven, and the branch pipe is more severely affected by the boundary layer on the main pipe wall. This results in significant differences in the velocity of the fluid flowing into the branch pipe, causing the branch flow rate to be measured to be smaller than expected. This leads to a deviation between the simulated and actual main pipe flow rate, resulting in inaccurate simulated main pipe flow rates. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-diameter flow measurement device, which can effectively improve the measurement sensitivity and accuracy of the flow meter in the tapered branch pipe, thereby improving the accuracy of flow measurement in the entire large-diameter main pipe.

[0005] The technical solution of the present invention is:

[0006] A large-diameter flow measurement device comprises: a rectifying grid welded to a main pipe to be tested, the main pipe being a cylindrical pipe body, the rectifying grid being a honeycomb-shaped guide plate; a tapered branch pipe, the middle section of which is located on one side of the exterior of the main pipe; an inlet section of the tapered branch pipe extending into the main pipe and positioned at the center of the main pipe and downstream of the rectifying grid; a sealing structure sealing the connection between the main pipe and the tapered branch pipe; an outlet section of the tapered branch pipe reconnecting to the main pipe downstream of the inlet section; an orifice of the inlet section of the tapered branch pipe having a tapered structure, and a fluid flow direction within the orifice of the inlet section of the tapered branch pipe being consistent with the liquid flow direction in the main pipe; a stop valve assembly comprising: an inlet stop valve and an outlet stop valve, respectively disposed within the inlet and outlet sections of the tapered branch pipe; when flow measurement is required, the two stop valves are opened to allow fluid to flow into the tapered branch pipe, the flow rate of the tapered branch pipe is measured by a flowmeter, and the flow rate of the main pipe is thereby inferred; and flow measurement is stopped when the stop valves are closed. The flow meter is arranged in the middle section of the tapered branch pipe. The flow meter has a built-in data processing module. The data processing module can calculate the fluid flow in the main pipe by combining parameters such as the pipe diameter ratio between the main pipe and the tapered branch pipe through the measured flow in the tapered branch pipe.

[0007] Furthermore, the rectifying grid is a honeycomb-shaped guide plate with a porosity of 30% to 50%. The fluid in the large-diameter pipe flows through the rectifying grid, which rectifies the fluid, improves the flow state of the fluid, makes the fluid flow rate more uniform, reduces turbulence, and evens out the flow rate distribution.

[0008] Furthermore, the contraction ratio of the tapered mouth structure is 1:3 to 1:5, and the contraction angle of the tapered mouth structure is 8° to 15°. The tapered mouth design can increase the flow velocity of the fluid when it enters the tapered branch pipe from the main pipe, and the Venturi effect is used to increase the flow velocity, forming a more stable and uniform flow state. It helps to reduce eddies and turbulence caused by sudden changes in the pipe cross-section, thereby reducing the negative impact on the flow meter in the middle section of the tapered branch pipe, making it easier for the flow meter to measure the flow more accurately. In addition, the design of the tapered mouth structure can significantly reduce pressure loss compared to the pipe design with a sudden reduction in cross-sectional area, which helps to maintain system efficiency and extend equipment life.

[0009] Furthermore, the rectifier grid sets the grid contraction angle to 10°±2° to form a new flow field optimization range.

[0010] Furthermore, the ratio of the thickness of the rectifying grid to the tube diameter is 1:10. The thickness of 1 / 10 provides sufficient structural depth to ensure flow adjustment, so that the fluid can effectively interact with the rectifying grid without being too thick to cause a large pressure loss.

[0011] Furthermore, the ratio of the diameter of the tapered branch pipe to the diameter of the main pipe is 1:5, which makes the flow insensitive to the pressure fluctuation of the main pipe and the pressure drop is not too large, suitable for ultra-high precision micro flow control.

[0012] Furthermore, due to the low flow rate within the main pipe to be measured, dirt, silt, and other impurities are easily deposited on the inner wall of the pipe and the rectifying grid. These deposits may affect the measurement accuracy of the flowmeter and even damage the flowmeter components. The system also includes: a transducer array embedded in the interior of the main pipe, located upstream of the rectifying grid. The transducer array includes multiple ultrasonic transducers arranged in a circular array on the inner wall of the main pipe. The ultrasonic transducers are encapsulated in a waterproof and corrosion-resistant package, such as a titanium alloy housing. High-frequency vibration waves generate a cavitation effect in the fluid, causing dirt to fall off the surface of the rectifying grid, thereby cleaning the rectifying grid.

[0013] Furthermore, the transducer array incorporates an intelligent controller that periodically activates the transducers. The main pipe also houses a power generation system for powering the transducer array. This system includes an impeller and a micro-generator connected to the impeller shaft. Fluid flow within the main pipe drives the impeller to rotate, which in turn rotates the micro-generator shaft, cutting magnetic flux lines and generating electricity.

[0014] The system further includes a control system comprising an anomaly detection unit and an execution unit, the anomaly detection unit being in communication with the execution unit, and the execution unit being in communication with both the inlet stop valve and the outlet stop valve. The anomaly detection unit is configured to send a signal to the execution unit when the flow rate exceeds a set threshold, causing the execution unit to control the inlet stop valve and the outlet stop valve to close, thereby stopping flow measurement in the tapered branch pipe and preventing damage to the flowmeter.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention combines a rectifying grid and a tapered branch pipe. The rectifying grid makes the flow field of the main pipe uniform, eliminates turbulence and vortexes, ensures a stable flow velocity distribution, effectively improves the flow state of the fluid, and provides a good prerequisite for accurate flow measurement. The cross-sectional contraction effect of the tapered branch pipe is used to accelerate the fluid and generate a stable pressure difference. The built-in data processing module of the flowmeter calculates the fluid flow in the main pipe based on the measured flow in the tapered branch pipe, thereby improving the measurement sensitivity and accuracy of the flowmeter, thereby improving the accuracy of flow measurement in the entire large-diameter main pipe.

[0017] The present invention is also equipped with a transducer array for cleaning the inner wall of the main pipe and the rectifying grid, effectively avoiding the problem that the movable parts or throttling parts of the flow meter may be stuck due to impurities such as dirt, silt, etc. deposited on the inner wall of the main pipe and the rectifying grid, thereby affecting the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the impeller structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the rectifying grid structure of the present invention.

[0021] Among them, 1. transducer array, 2. rectifier grid, 3. tapered branch pipe, 4. inlet stop valve, 5. flow meter, 6. control system, 7. outlet stop valve, 9. main pipe, 10. impeller, 11. micro generator. DETAILED DESCRIPTION

[0022] The following combination Figure 1-3 , a detailed description of the specific embodiments of the present invention is provided. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the present invention.

[0023] It should be noted that the circuit connections involved in the present invention all adopt conventional circuit connection methods and do not involve any innovation.

[0024] Example

[0025] A large diameter flow measurement device, comprising: a rectifying grid 2, a tapered branch pipe 3, a stop valve assembly and a flow meter 5, such as Figure 1 As shown, the rectifier grid 2 is welded to the main pipe 9 to be tested and is arranged on the inner wall of the main pipe 9. The main pipe 9 is a cylindrical pipe body. Figure 3 As shown, the main body of the rectifying grid 2 is a honeycomb guide plate; Figure 1As shown, the middle section of the tapered branch pipe 3 is located on the outside of the main pipe 9. The inlet section of the tapered branch pipe 3 extends into the main pipe 9 and is located at the center of the main pipe 9 and downstream of the rectifying grid 2. The connection between the main pipe 9 and the tapered branch pipe 3 is sealed by a sealing structure. The outlet section of the tapered branch pipe 3 is reconnected to the main pipe 9. On the pipeline of the main pipe 9, the outlet section is located downstream of the inlet section. The pipe opening of the inlet section of the tapered branch pipe 3 is a tapered structure, and the flow direction of the fluid in the pipe opening of the inlet section of the tapered branch pipe 3 is consistent with the flow direction of the liquid in the pipeline of the main pipe 9. The stop valve assembly includes: an inlet stop valve 4 and an outlet stop valve 7, which are respectively arranged in the inlet section and outlet section of the tapered branch pipe 3. When flow measurement is required, the two stop valves are opened to allow fluid to flow into the tapered branch pipe 3. The flow rate of the tapered branch pipe 3 is measured by the flowmeter 5, and the flow rate of the main pipe 9 is then inferred. When the stop valves are closed, the flow measurement is stopped. The flow meter 5 is arranged in the middle section of the tapered branch pipe 3. The flow meter 5 has a built-in data processing module. The data processing module can combine parameters such as the pipe diameter ratio between the main pipe 9 and the tapered branch pipe 3 to calculate the fluid flow in the main pipe 9 through the measured flow in the tapered branch pipe 3.

[0026] In some embodiments, the flow grid 2 is a honeycomb-shaped guide plate made of corrosion-resistant aluminum alloy, with a porosity of 30% to 50%. The fluid in the large-diameter main pipe 9 to be tested flows through the flow grid 2, which rectifies the fluid, improving its flow state, making the flow velocity more uniform, reducing turbulence, and achieving a uniform flow velocity distribution.

[0027] In some embodiments, the contraction ratio of the tapered structure is 1:3 to 1:5, and the contraction angle of the tapered structure is 8° to 15°. The tapered design can increase the flow velocity of the fluid when it enters the tapered branch pipe 3 from the main pipe 9, and the Venturi effect is used to increase the flow velocity, forming a more stable and uniform flow state. It helps to reduce eddies and turbulence caused by sudden changes in the pipe cross-section, thereby reducing the negative impact on the flow meter 5 in the middle section of the tapered branch pipe 3, making it easier for the flow meter 5 to measure the flow more accurately. In addition, the design of the tapered structure can significantly reduce pressure loss compared to a pipe design with a suddenly reduced cross-sectional area, helping to maintain system efficiency and extend equipment life.

[0028] In some embodiments, the rectifier grid 2 sets the grid contraction angle to 10°±2°, forming a new flow field optimization range outside the ISO5167 standard. This adjusts the acceleration and flow direction of the passing fluid, reduces downstream turbulence, makes the flow more uniform and stable, improves flow measurement accuracy, reduces pressure loss, and improves energy efficiency.

[0029] In some embodiments, the ratio of thickness to tube diameter of the rectifying grid 2 is 1:10. The thickness of 1 / 10 provides sufficient structural depth to ensure flow adjustment so that the fluid can effectively interact with the rectifying grid 2 without being too thick to cause large pressure loss.

[0030] In some embodiments, the ratio of the diameter of the tapered branch pipe 3 to the diameter of the main pipe 9 is 1:5, which makes the flow insensitive to the pressure fluctuation of the main pipe 9 and the pressure drop is not too large, suitable for ultra-high precision micro flow control.

[0031] In some embodiments, due to the low flow velocity in the pipe of the main pipe 9 to be measured, impurities such as dirt and silt are easily deposited on the inner wall of the pipe and the rectifying grid. These deposits may affect the measurement accuracy of the flow meter and even damage the components of the flow meter. It also includes: a transducer array 1, which is embedded in the inside of the main pipe 9 and located upstream of the rectifying grid 2. The transducer array 1 includes multiple ultrasonic transducers, and the multiple ultrasonic transducers are arranged in a ring array on the inner wall of the main pipe 9. The ultrasonic transducers are packaged in a waterproof and corrosion-resistant package, such as a titanium alloy shell. The cavitation effect is generated in the fluid by high-frequency vibration waves above 20kHz, causing dirt to fall off the surface of the rectifying grid 2, thereby achieving cleaning of the rectifying grid 2.

[0032] In some embodiments, the transducer array 1 is equipped with an intelligent controller that can periodically activate the transducers; a power generation system is also provided in the main pipe 9 for supplying energy to the transducer array 1; Figure 1 and Figure 2 As shown, the power generation system includes an impeller 10 and a micro-generator 11 connected to the shaft of the impeller 10. The fluid flow in the main pipe 9 drives the impeller 10 to rotate, which in turn causes the shaft of the micro-generator 11 to rotate and cut the magnetic flux lines to generate electricity.

[0033] In some embodiments, a control system 6 is further included. The control system 6 includes an abnormality detection unit and an execution unit. The abnormality detection unit and the execution unit are in communication with each other. The execution unit is in communication with both the inlet stop valve 4 and the outlet stop valve 7. The abnormality detection unit is configured to send a signal to the execution unit when the flow rate exceeds a set threshold. The execution unit controls the inlet stop valve 4 and the outlet stop valve 7 to close, thereby stopping flow measurement in the tapered branch pipe 3 and preventing damage to the flow meter 5.

[0034] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A large diameter flow measurement device, characterized in that: include: A rectifying grid (2) is arranged inside the pipe of the main pipe (9) to be tested; A tapered branch pipe (3), the inlet section of which extends into the main pipe (9) and is located at the center of the main pipe (9); the pipe opening of the inlet section of the tapered branch pipe (3) is a tapered structure, and the flow direction of the fluid in the pipe opening of the inlet section of the tapered branch pipe (3) is consistent with the flow direction of the liquid in the pipeline of the main pipe (9), and is located downstream of the rectifying grid (2); the middle section of the tapered branch pipe (3) is located on one side outside the main pipe (9), and the outlet section of the tapered branch pipe (3) is connected to the main pipe (9) and is located downstream of the inlet section; The stop valve assembly comprises: an inlet stop valve (4) and an outlet stop valve (7), which are respectively arranged in the inlet section and the outlet section of the tapered branch pipe (3); The flow meter (5) is arranged in the middle section of the tapered branch pipe (3). The flow meter (5) can calculate the fluid flow in the main pipe (9) based on the measured flow in the tapered branch pipe (3).

2. A large diameter flow measurement device according to claim 1, characterized in that: The rectifying grid (2) is a honeycomb-shaped flow guide plate, and the porosity of the rectifying grid (2) is 30% to 50%.

3. A large diameter flow measurement device according to claim 1, characterized in that: The shrinkage ratio of the tapered mouth structure is 1:3 to 1:5, and the shrinkage angle of the tapered mouth structure is 8° to 15°.

4. A large diameter flow measurement device according to claim 1, characterized in that: The rectifying grid (2) sets the grid contraction angle to 10°±2°.

5. A large-diameter flow measurement device according to claim 1, characterized in that: The ratio of the thickness of the rectifying grid (2) to the tube diameter is 1:

10.

6. A large diameter flow measurement device according to claim 1, characterized in that: The ratio of the diameter of the tapered branch pipe (3) to the diameter of the main pipe (9) is 1:

5.

7. A large diameter flow measurement device according to claim 1, characterized in that: Also includes: The transducer array (1) is embedded in the main pipe (9) and is located upstream of the rectifier grid (2). The transducer array (1) includes a plurality of ultrasonic transducers, which are arranged in a ring array on the inner wall of the main pipe (9).

8. A large-diameter flow measurement device according to claim 7, characterized in that: The transducer array (1) is equipped with an intelligent controller capable of periodically starting the transducers; a power generation system is also provided in the main pipe (9) for supplying energy to the transducer array (1); the power generation system comprises an impeller (10) and a micro generator (11) connected to the shaft of the impeller (10).

9. The large-diameter flow measurement device according to claim 1, characterized in that: The system further comprises a control system (6), wherein the control system (6) comprises an abnormality detection unit and an execution unit, wherein the abnormality detection unit and the execution unit are connected and communicated with each other, and the execution unit is connected and communicated with both the inlet stop valve (4) and the outlet stop valve (7).

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