Vortex street calorimeter with permanent-magnet structure

Abstract

The calorimeter is in following structure: installing a permanent magnet above the measuring tube; an electrode insulated to wall of measuring tube is in the tube; a winding is wrapped on periphery of the permanent magnet; through drive circuit, single chip controls whether the winding is electrified as well as electrified positively or negatively so as to enhance or weaken magnetic field in tube; through wire, the electrode is connected to amplifying circuit, comparator circuit, single chip circuit, signal triggering single chip for spiral vortex impulse; being installed on inlet pipe and return pipe respectively, two thermistors is connected to bridge circuit and single chip circuit. Single chip carries out sampling timely and calculates temperatures of inlet water and return water. Single chip circuit also supplies circuits: LCD, infrared communication etc. One 3.6V battery supplies power for whole circuit. Advantages are: micro power consumption, easy of reading and recording.

Description

Technical field [0001] The invention relates to a vortex calorimeter with a permanent magnet structure, which has low power consumption, low price, accurate and reliable measurement, and is mainly used for heat (cold) measurement in industries, homes, offices and other places. Background technique [0002] At present, domestic and foreign household heat meters are mainly based on traditional water meters with pulse sensors, temperature sensors and single-chip microcomputers to calculate the actual heat used. Pulse sensors are mainly reed switches, Hall sensors, and TI inductive sensors. There are some problems with this method: [0003] 1) When the single-chip microcomputer reads the flow of the water meter, the measurement is incorrect and unreliable due to sensor problems; [0004] 2) As the heating water is often reclaimed water, it is easy to accumulate pollution, resulting in incorrect water meter measurement; [0005] 3) Due to the high processing accuracy requirements of t...

AI Technical Summary

Problems solved by technology

[0003] 1) When the single-chip microcomputer reads the flow rate of the water meter, the measurement is incorrect and unreliable due to sensor problems;

[0004] 2) Since reclaimed water is often used for heating water, it is easy to accumulate pollution, resulting in incorrect water meter measurement;

[0005] 3) Due to the high processing accuracy requirements of the water meter used for heat measurement, the product quality is unstable in actual production, and the failure rate is high in actual use

Common vortex flowmeters often use piezoelectricity to detect vortex signals. The disadvantage is that the ability to resist pipeline vibration and electromagnetic interference is poor.

So some people proposed to use the electromagnetic detection method, and their electromagnetic detection method often uses a permanent magnet with a strong magnetic field. The disadvantage is that it is easy to absorb rust and other sundries in the water.

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