A High-Precision Flow Measuring Device Not Affected by Environmental Factors

Abstract

A high-accuracy flow measuring device not affected by environmental factors is characterized in that a sensing measuring set is arranged at the outer side of the wall of a pipeline serving as a fluid passage and comprises a static measuring area and a dynamic measuring area, and a static measuring sensor and a dynamic measuring sensor are covered by a sealing packaging layer; a static measuring cavity is arranged between the static measuring sensor of the static measuring area and the inner wall of the fluid passage, communicated with the fluid passage through an interval or a seam and used for providing fluid static pressure in the same environment relative to the dynamic measuring sensor for the static measuring sensor. The high-accuracy flow measuring device not affected by environmental factors breaks through interference, caused by various environments, materials, temperature, fluid pressure and pressure fluctuation, on non-contact flow measurement, and has the advantages of being high in accuracy, free of pressure loss, simple in structure, low in power consumption, flexible to install, free of maintenance and long in service life, and an electronic flowmeter has obvious advantages in market competition.

Description

technical field [0001] The invention relates to the technical field of flow measurement, in particular to a high-precision flow measurement device not affected by environmental factors. Background technique [0002] In traditional heat meters, cold water meters, hot water meters and other liquid flow metering devices, most of the measuring devices use mechanical impellers or rotor-type impellers. Their metering principle: the liquid flow drives the impeller to rotate, the number of turns of the impeller is proportional to the flow rate, and the calculator calculates the flow rate by collecting the number of turns of the impeller. There is mechanical wear due to the rotation of the impeller. They all have defects such as short life and complex structure in use. Especially due to the mechanical wear of the impeller rotation, the measurement accuracy is reduced. In addition, when the liquid medium contains impurities, problems such as blockage of the flowmeter are often caus...

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Problems solved by technology

It also caused the problems of increased turbulent flow in the measurement direction of the measurement chamber when measuring liquid flow, laminar flow disorder, and unstable flow signal, which restricted the measurement accuracy.

[0005] Therefore, high-precision flow measurement is currently facing two problems. If the sensing device is used in contact with the fluid, turbulent flow will be generated. Without direct contact with the fluid, on the one hand, it will cause power loss of the device. On the other hand, even if the pressure of the fluid channel can be measured through a highly sensitive sensor, it is affected by the material, temperature, and pressure fluctuations of the fluid channel. It will seriously affect or even completely cover the small pressure changes of the measuring object signal to the sensor. Simply measuring the pressure value cannot easily obtain the measured pressure difference or the measurement result. If the measurement of the pressure difference value does not exclude the difference caused by the environment of the measurement point Materials, different locations, different temperatures, different time, different measuring devices and other influences cannot finally obtain high-precision flow measurement results

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