Thermal type gas mass-flow meter internally provided with rectifier

Abstract

The invention provides a thermal type gas mass-flow meter internally provided with a rectifier. The thermal type gas mass-flow meter comprises a flow meter pipeline, a flow measuring part and the rectifier. The thermal type gas mass-flow meter is characterized in that the rectifier is arranged in the front end of the flow meter pipeline, the flow meter pipeline and the rectifier are connected into a whole, and the distance between the rectifier and the flow measuring part is 3-5 times of the diameter of the flow meter pipeline. The thermal type gas mass-flow meter has the advantages that the thermal type gas mass-flow meter is directly installed, and the influence of a straight pipe section of the flow meter pipeline on the flow meter does not need to be considered; the rectifier and the flow meter pipeline are designed in an integrated mode, exposed points of the pipeline are effectively reduced, labor cost is reduced, installation time is saved, and high cost performance is achieved.

Description

Technical field [0001] The invention relates to a gas mass flow meter, in particular to a thermal gas mass flow meter with a built-in rectifier, which can measure a full-tube single-phase fluid of gas, vapor, liquid and other media. In principle, it is a direct gas measurement Mass flow meters do not require conventional temperature and pressure compensation, and can be used in petrochemical, metallurgical, and electric power industries. Background technique [0002] Since the thermal gas mass flowmeter measures the flow according to the principle of thermal diffusion, and the plug-in probe of the flow measurement part is only installed at the center point of the flowmeter pipe, the flow is obtained from the point flow, so the length of the straight pipe section of the flowmeter when in use Must meet the length of more than 15 times the diameter of the flowmeter pipe, so that the fluid is in a fully developed steady flow state. However, industrial sites often have harsh environm...

AI Technical Summary

Problems solved by technology

However, industrial sites often have harsh environments, complex distribution of pipelines, and many elbows, valves, and variable diameters. In many cases, it is difficult to meet the stringent requirements of the instrument on the straight pipe section of the flowmeter, and the accuracy of the instrument is greatly reduced, especially in important occasions. time, it will bury hidden dangers for the safety of the production process

[0003] In order to ensure the measurement accuracy of the instrument, a rectifier is usually installed independently in front of the flowmeter, which can also reduce the requirements of the instrument on the straight pipe section of the flowmeter pipeline, but this method adds a new dew point to the pipeline when it is used, and may cause medium leakage , also affects the production

In addition, the separate installation of the rectifier and flowmeter will inevitably result in an increase in material and labor costs

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