Structure and mounting method of flow measurement sensor based on transit time method

Abstract

The invention discloses a structure and a mounting method of a flow measurement sensor based on a transit time method. The structure comprises first flow measurement sensors and second flow measurement sensors which are arranged pairwise and vertically mounted on the wall of a pipeline, wherein wave beam ends capable of transmitting and receiving wave beams are arranged at bottom ends of the firstflow measurement sensors and the second flow measurement sensors, and wave bean straight lines formed between first wave beam ends and second wave beam ends do not intersect with the axis of the pipeline, and the included angle formed by the wave beam straight lines and the axis of the pipeline is smaller than 90 degrees. The flow measurement sensors are vertically mounted on the wall of the pipeline, the mounting complexity and the mounting cost of the flow measurement sensors are reduced, besides, wave beam straight lines do not intersect with the axis of the pipeline, the included angle formed by the wave beam straight lines and the axis of the pipeline is smaller than 90 degrees, so that the effects of Reynolds numbers of fluids on measurement coefficients are reduced, and the high-flow-velocity multi-working-condition flow measurement accuracy is improved. The structure and the mounting method can be widely applied to the flow measurement field.

Description

technical field [0001] The invention relates to the field of flow measurement, in particular to a structure and installation method of a flow measurement sensor based on the time-of-flight method. Background technique [0002] Transit Time Ultrasonic Flow Measurement refers to the use of a pair of beam transducers to alternately (or simultaneously) send and receive beams, and calculate the flow velocity of the measured fluid by detecting the forward and reverse propagation time differences of the beams in the medium , and then calculate the flow rate by the flow rate. The beams that can be applied to flow measurement are acoustic, ultrasonic and light waves. [0003] Beam flowmeters have been applied in more and more occasions because they have no moving parts, long service life, high precision and good stability. field. Large-diameter beam flowmeters can be installed with flow measurement devices on existing pipelines by using field-insertable sensors, which can greatly ...

AI Technical Summary

Problems solved by technology

[0006] However, in practical applications, the beam path that does not pass through the center of the pipe circle is generally only suitable for the production of small and medium-caliber pipeline flowmeters, which are installed and debugged in the factory. Larger-caliber flowmeters are produced or need to install insertion flowmeters on site. Under certain circumstances, it is very difficult to accurately locate and orientate the installation of sensors on the pipeline

For example, Germany's Siemens has introduced a dual-channel insertion sensor for on-site installation, which realizes a half-chord distance beam path and can obtain high measurement accuracy in a large flow range. However, the on-site installation process of this dual-channel insertion sensor is very complex, such as figure 2 and image 3 , it needs to weld a special oblique casing on the surface of the pipeline at the installation site to install the sensor. This kind of oblique casing has different models according to the size of the pipeline. Special tooling is required on site for oblique welding and drilling, which requires high operational accuracy. , the installation difficulty and cost are very high, and the application is greatly restricted

On the other hand, since the sensor is installed at an oblique angle, in case the sensor is damaged during use, it is difficult to replace the sensor online without stopping the flow

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