New Ultrasonic Flow Measuring Instrument with Vane Structure
A technology of blade structure and flow measurement, which is applied in the field of metering instruments, can solve the problems of ultrasonic flow measuring instrument measurement accuracy and stability, complicated flow characteristics of the measured fluid, and affecting the measurement stability of ultrasonic heat meters, etc., to improve Effects of measurement stability and improvement of measurement uncertainty
Active Publication Date: 2020-10-27
SHANDONG UNIV
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Problems solved by technology
In addition, when the diameter of the ultrasonic heat meter is less than 50 mm, the U-shaped reflection method is usually used to extend the sound path to ensure the measurement accuracy. The reflection device of the U-shaped reflection ultrasonic heat meter changes the cross-section of the flow, thus causing the flow characteristics of the measured fluid to change. Complicated, generating turbulent eddies of different scales
The above factors will all have an impact on the measurement accuracy and stability of the ultrasonic flow measuring instrument
Therefore, both the installation error in front of the ultrasonic heat meter and the reflection column inside the meter may cause large-scale eddies to affect the measurement stability of the ultrasonic heat meter
Method used
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[0022] The present invention will be further introduced below in conjunction with the accompanying drawings and embodiments.
[0023] Such as Figures 1 to 4 As shown, in the present invention, a plurality of trapezoidal vortex-eliminating blades 2 are arranged in the flow channel of the ultrasonic wave propagation area of the ultrasonic heat meter according to the pipe diameter, and the vortex-eliminating blades 2 are arranged circumferentially in the flow channel 1 . The length of the long side is l, the length of the short side is l-2h, and the thickness is d. The size value changes with the size of the measured pipe diameter, but the height of the trapezoid is less than half of the pipe diameter h<D / 2 to ensure the effective passage of ultrasonic waves. pipe center. The structure can break up large-scale eddies without affecting the propagation of acoustic signals.
[0024] The design of the trapezoidal structure of the vortex-eliminating blade 2 can reduce the resista...
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The invention provides a novel ultrasonic flow measuring instrument with a vortex eliminating blade structure and relates to the field of ultrasonic metering instruments. The novel ultrasonic flow measuring instrument comprises a water meter base table, an acquisition device, a flow rate and water rate calculating instrument, a setting device and an early warning system. The water meter base tablecomprises an over-current channel and a shell; a vortex eliminating blade is installed in an ultrasonic propagation section of the over-current channel; the vortex eliminating blade is arranged alongan axis of the over-current channel; and the height h of the vortex blade is smaller than one half of the inner diameter D of a pipe of the over-current channel. According to the novel ultrasonic flow measuring instrument with a vortex eliminating blade structure in the invention, a vortex blade structure is introduced in a base table track of the ultrasonic flow measuring instrument; the flow channel is subjected to an optical design; large-scale vortex introduced by various types of pipe elements or reflecting device in front of the ultrasonic flow measuring instrument is smashed so as to improve the measurement uncertainty of the ultrasonic flow measuring instrument and improve the measurement stability.
Description
technical field [0001] The invention provides a novel ultrasonic flow measuring instrument with a vortex-eliminating blade structure, which relates to the technical field of measuring instruments, in particular to a flow measuring instrument for various application of ultrasonic principles. Background technique [0002] At present, ultrasonic flow measuring instruments are mostly used for flow measurement of water and gas media. For example, the products of Weihai Tiangang and Tangshan Huizhong all use ultrasonic flow measuring pipe sections as flow detection base meters. Ultrasonic flow measuring instruments are widely used in various fields due to their wide measurement range, high measurement accuracy, no moving parts, and good high temperature adaptability. [0003] Ultrasonic flow measuring instruments mostly collect the time difference between forward flow and reverse flow on the sound wave propagation path to measure the linear average velocity on the sound channel, a...
Claims
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IPC IPC(8): G01F1/66G01F15/00
CPCG01F1/667G01F15/00
Inventor 杜广生耿介张蒙
Owner SHANDONG UNIV