Vortex-street flow sensing measuring method and special sensor

Abstract

The invention relates to a vortex-street flow sensing measuring method and a special sensor, and belongs to the field of flow sensors. The special sensor mainly comprises a base and a mounting seat, and is characterized in that a piezoelectric signal generator is installed in a vertical mounting hole through a plunger ring and comprises an insulation sheet and two piezoelectric sheets; the insulation sheet is provided with two sets of conducting areas, and each piezoelectric sheet is provided with two sets of piezoelectric areas; a signal electrode sheet is inserted into the contact part of each conducting area and each piezoelectric area; the signal electrode sheet outputs a flow signal comprising a vibration signal, and a grounding electrode sheet is led out from the base; the signal electrode sheets and the grounding electrode sheet are externally connected with an analysis circuit after outputting; and after being converted and amplified, the flow signal is processed by a central processor, and the central processor outputs a standard flow signal. The invention realizes the measurement of the flow signal and the vibration signal in the same position, and solves the problems oflow signal intensity, poor anti-interference and anti-vibration capability, and high lower limit.

Description

Technical field [0001] The invention belongs to the field of flow sensors, in particular to a vortex flow sensor measurement method for measuring gas, liquid, steam and other media. The invention also relates to a dedicated sensor device using the method, especially a piezoelectric sensor. Background technique [0002] The vortex flow sensor has the advantages of high measurement accuracy, low pressure loss and low maintenance, and its application is increasing year by year. The currently adopted vortex flow sensor measurement method is to insert a flow sensor made of piezoelectric material into the pipe or triangular column to measure the flow signal. This method takes into account the pressure loss and the structural limitation of the triangular column, making the pressure The small design of the electric chip brings the disadvantages of small force area and small piezoelectric signal. It is difficult to deal with clutter signals such as strong vibration. At the same time, the...

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Problems solved by technology

The currently used vortex street flow sensing measurement method, one is to insert the flow sensor made of piezoelectric material into the pipe or the inside of the triangular prism to measure the flow signal. The design of the electroplate is small, which brings the disadvantages of small stress area and small piezoelectric signal. When there are strong vibration and other clutter signals, it is difficult to deal with them. At the same time, the small signal also affects the flow rate to a large extent. The measurement of the lower limit; another way is to fix the sensor on the top of the triangular column, and the piezoelectric sheet is placed in parallel with the pipeline for measurement. The problem of signal interference has not been well resolved

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