Ultrasonic flow measurement device and method for fuel terminal settlement
A flow measurement and ultrasonic technology, applied in the field of precision stability and system reliability devices, can solve problems such as inability to guarantee turbulent flow distribution, inability to adapt, and unrealistic, to save propagation time, improve accuracy and reliability, reduce The effect of small randomness
Active Publication Date: 2011-10-05
TOKHEIM HENGSHAN TECH GUANGZHOU
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Problems solved by technology
In the U-shaped pipe structure, even if the above requirements can be met in some pipes, the fully developed turbulent flow distribution cannot be guaranteed in most pipe sections due to the front and rear elbow parts of the fluid, such as Figure 4 As shown, it is impossible to achieve a symmetrical turbulent flow distribution over the very long distances in which the fluid flows into and out of the U-tube structure
To sum up, the method of calculating the fctr coefficient to obtain the flow rate by assuming the characteristic value of the flow velocity distribution obtained by assuming the ideal turbulent flow distribution is not suitable for the limitation of the actual pipe bending. On the other hand, in most actual measurement processes, it is necessary to obtain accurate Fluid density and viscosity information to obtain an accurate Reynolds number is also impractical
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[0046] see Figure 5-8 , the present invention is used for the ultrasonic flow measurement device of fuel terminal settlement, comprises following structure: two or more independent ultrasonic measuring units, the control circuit that is used to control each independent ultrasonic measuring unit, and is used to receive each The direct measurement result of the ultrasonic measurement unit is further analyzed to calculate the flow rate and output the flow rate to the host processor; wherein the two or more independent ultrasonic measurement units are connected in series in sequence, so that the formed The entire ultrasonic pipeline is in an "S" shape, so that the distortion caused by the curved part of the ultrasonic pipeline to the flow velocity distribution can mostly cancel each other out. The working frequencies of the ultrasonic measuring units can be the same or different from each other. Each ultrasonic measurement unit includes a pair of ultrasonic transducers (such as ...
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The invention relates to an ultrasonic flow measurement device and method for fuel terminal settlement. The device comprises two or more independent time-of-flight ultrasonic flow measurement units, a control circuit for controlling each independent ultrasonic flow measurement unit and an upper processor for receiving the measurement result of each ultrasonic flow measurement unit and further analyzing the result to calculate and output the flow, wherein the two or more independent time-of-flight ultrasonic flow measurement units are connected in series, the final flow result is calculated bymeans of dynamic weighted average, the influence of time difference measurement on random error is lowered, and the precision and the repetitiveness of small-volume measurement and calibration are improved; the diameter of each measurement pipe section is appropriately shrunk to be smaller than the caliber of a system pipeline, thus the passage flow rate and Reynolds number of fluid are enhanced so as to improve the resolution of time difference measurement and the precision and linearity of flow measurement.
Description
technical field [0001] The present invention relates to a device and method for measuring the volume flow of liquid fuel, in particular to a device and method for improving the accuracy stability and system reliability of fuel volume flow measurement. Background technique [0002] Ultrasonic flow measurement technology is one of the fastest-growing technologies in the field of flow measurement and control in recent years. The most notable feature is that its technology is expanding from general process control and water treatment applications to high-precision and trade measurement. In the trade measurement of natural gas and oil products, ultrasonic flow measurement devices have been more and more widely used in the application of large-diameter pipelines above DN100mm, and research on the application of high-precision ultrasonic flow measurement in smaller-caliber fuel metering settlements has begun to become the leading edge of technology. The biggest advantage of the ul...
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IPC IPC(8): G01F1/66
Inventor 陈建明刘风华廖仁
Owner TOKHEIM HENGSHAN TECH GUANGZHOU