A circuit for photoelectric direct reading water meter to prevent bubble interference

Abstract

The invention discloses a photoelectric direct-reading water meter anti-bubble interference circuit; when the system needs to read the data, a single chip can detect all photoelectric tubes in all photoelectric tube modules of the water meter in advance; if all photoelectric tubes are normal, detected luminous tube values and receiver tube values are temporarily stored; according to the detected luminous tube values and receiver tube values, the received maximum value subtracts the received minimum value, and divides by 2 so as to obtain an intermediate value; the intermediate value is temporarily stored to serve as a bias value; the single chip reads the value of the present print wheel position, compares the read value with the intermediate value, and enters a table function according to the compared value so as to obtain the present print wheel position; the calculated accurate data is returned to the single chip, and transferred back to the system through a communication processing module, thus ensuring the water meter to automatically regulate and determine level deviation under bubble interference, ensuring data accuracy, solving bubble interference influence against light conduction, and removing photoelectric reading misjudgement possibility.

Description

technical field [0001] The invention relates to the field of water meters, in particular to a circuit for preventing air bubble interference in a photoelectric direct-reading water meter. Background technique [0002] With the development of my country's economy, the expansion of urban scale and the continuous improvement of modernization, the city's water supply pipe network system is becoming larger and larger, and the measurement and management of the pipe network are becoming more and more difficult; on the one hand, the monitoring of the pipe network in the water supply system There are a large number of monitoring points, the monitoring is not comprehensive, and the geographical location is scattered. It is no longer possible to rely solely on manpower. Inaccurate and incomplete data, lack of an effective water leakage management mechanism, and lack of a unified water leakage management system have led to a huge waste of public resources, and have also caused huge direct...

AI Technical Summary

Problems solved by technology

[0002] With the development of my country's economy, the expansion of urban scale and the continuous improvement of modernization, the city's water supply pipe network system is becoming larger and larger, and the measurement and management of the pipe network are becoming more and more difficult; on the one hand, the monitoring of the pipe network in the water supply system There are a large number of monitoring points, the monitoring is not comprehensive, and the geographical location is scattered. It is no longer possible to rely solely on manpower. Inaccurate and incomplete data, lack of effective water leakage management mechanism, and lack of a unified water leakage management system have led to a huge waste of public resources, and also caused huge direct economic losses to water business units

[0003] Therefore, to solve problems such as leakage, flow monitoring, and manual meter reading, a comprehensive production-sales difference management and leakage control solution system is required; and the wet-type liquid-sealed photoelectric direct-reading remote water meter adopts the method of photoelectric coding, and the mechanical counting number of the water meter The coded data is read directly on the wheel. Compared with the traditional pulse meter, the electromechanical signal conversion mode of pulse sampling and accumulation is completely abandoned. It can reduce the reading error to zero. It is an electronic remote transmission with zero error in the electromechanical conversion in the automatic meter reading system. The water meter adopts a low power consumption design, usually does not need power supply, and only needs to be powered when reading the meter or the valve; while the biggest problem encountered by the photoelectric device when it is working is that the water source is turbid or air bubbles, and the luminous tube encounters air bubbles when it emits The light will be refracted and diffracted, which will reduce the light intensity irradiated to the photosensitive receiving tube, reduce the induced current of the photosensitive receiving tube, cause sensor coding errors, and cause reading errors due to bubble interference, resulting in economic losses

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