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Flowmeter

A flowmeter and a technology for measuring signals, applied in the field of flowmeters, can solve problems such as the problem of conduit wall thickness, expensive calculations, and the inability to accurately determine the sound velocity of sonic media.

Inactive Publication Date: 2005-12-21
ENDRESS HAUSER FLOWTEC AG
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Problems solved by technology

The process is of course quite time consuming
[0010] In addition, some parameters, especially those necessary for the precise determination of the volume flow in clamp-on flowmeters, are rarely known precisely; or the calculation of these parameters is quite expensive
Although the determination of the outer diameter of the catheter is no longer a problem, the calculation of the catheter wall thickness is completely problematic
Also in many cases the sound velocity of the conduit material and the medium will not be determined precisely

Method used

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Embodiment Construction

[0026] FIG. 1 shows a schematic view of a preferred embodiment of an ultrasonic flowmeter 1 according to the invention. The measuring device 1 is a clamp flow meter in the shown case. The measuring device 1 calculates the volume flow of the medium 9 in the pipe 7 according to the known travel time difference method.

[0027] The basic components of a clamp-on ultrasonic flowmeter 1 are the two ultrasonic transducers 2 , 3 and the control / evaluation unit 6 . The two ultrasonic transducers 2 , 3 are mounted on the tube 7 via fastening means which are not shown separately in FIG. 1 . Fixing devices are sufficiently known from the prior art and can be offered and sold by the applicant. A medium 9 flows through the tube 7 with the inner diameter di in the direction of flow S. FIG.

[0028] The ultrasonic transducer 2; 3 has at least one piezoelectric element 4, 5 and a coupling key as basic components, the piezoelectric element 4, 5 generating and / or receiving ultrasonic measure...

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Abstract

The invention relates to a flow meter (1) having at least two ultrasonic transducers (2, 3) mounted on a container (7) through which a medium (9) flows in a flow direction (S), where the ultrasonic transducers (2, 3) emit and receive ultrasonic measuring signals alternately along the flow direction (S) and against the flow direction (S), and the control / analysis unit (6) according to the flow direction (S) The travel time difference of the ultrasonic measurement signal propagating against the flow direction (S) determines and / or monitors the volume flow of the medium (9) in the container (7). According to the invention, the ultrasonic transducers ( 2 , 3 ) are designed such that they emit and receive ultrasonic measurement signals or sound fields with a large aperture angle (γ) or with a large sound beam expansion.

Description

technical field [0001] The invention relates to a flow meter with at least two ultrasonic transducers and a control / evaluation unit. Two ultrasonic transducers are mounted on the vessel through which the medium flows in the flow direction. The control / evaluation unit calculates the volumetric flow of the medium in the container from the difference in travel times of the measurement signals propagating along and against the flow direction. Background technique [0002] Ultrasonic flow meters of the aforementioned type by means of the so-called time-of-flight method are already widely used in process technology and automation technology. Flow meters are able to determine the volume flow in a container, such as a conduit, without contact. [0003] A distinction is made between ultrasonic flow measuring receivers used in conduits and clamp-on flowmeters in which the ultrasonic transducer is pressed onto the conduit from the outside via a clamp connection. Clamp-on flow meters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 托马斯·弗勒利希托尔斯滕·施特龙茨阿希姆·维斯特
Owner ENDRESS HAUSER FLOWTEC AG
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