Electromagnetic heat meter

Abstract

The invention discloses an electromagnetic heat meter. The electromagnetic heat meter comprises an electromagnetic flow sensor, a temperature sensor and a converter, wherein the converter comprises an amplification filter circuit and a central processor; the amplification filter circuit is internally provided with a feedback circuit; the feedback circuit comprises an analogue-digital conversion module, a digital signal processing module, a digital-analogue conversion module, a signal conversion unit and a negative feedback module; the digital signal processing module arranged in the feedback circuit analyzes flow signals and respectively feeds back a flow signal and interference noise into the amplification filter circuit to suppress interference signal and low-frequency flow noise. The electromagnetic heat meter, disclosed by the invention, has the advantages of guaranteeing the measuring precision while guaranteeing stability of the zero point of the flow and the micro-flow and satisfying high-precision requirements on detection of a small flow.

Description

technical field [0001] The invention relates to the field of cold and heat metering devices, in particular to an electromagnetic heat meter for measuring cold and hot fluids by means of electromagnetic induction. Background technique [0002] Under the guidance of my country's policy of further deepening the implementation of energy conservation and emission reduction, with the introduction of national heat metering industry standards, household metering has been carried out in many cities. Due to the poor quality of hot water supplied by China's heating system, many impurities, and complicated pipeline conditions In many cases, the shortcomings of the traditional heat meter are gradually highlighted in the actual use process. The specific performance is as follows: 1. The traditional flowmeter or heat meter mostly adopts the mechanical impeller or rotor type, because the number of turns of the impeller is directly proportional to the flow rate , so the calculator can calculat...

AI Technical Summary

Problems solved by technology

However, there is mechanical wear in the rotation of the impeller, so that the traditional mechanical flowmeter or heat meter has the disadvantages of complex structure, large pressure loss, short service life and low measurement accuracy.

2. Ultrasonic heat meters are much better than mechanical heat meters, but ultrasonic heat meters are afraid of impurities in water

When the flow in the pipeline is relatively small, the interference of flow noise is particularly prominent, which leads to the poor test effect of the electromagnetic flowmeter on the small flow, and the differential error caused by the differential effect will cause the induced electromotive force generated by the fluid flow to drift. It causes the zero point of the system to fluctuate, which greatly reduces the measurement accuracy. Therefore, the existing electromagnetic heat meter cannot achieve accurate measurement of the flow measurement when the flow is small.

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