A Method for Preventing Air Bubble Interference in Photoelectric Direct Reading Water Meter

Abstract

The invention discloses a bubble interference preventing method of a photoelectric direct-reading water meter. The bubble interference preventing method includes the steps that all photoelectric tubes in the water meter are pre-detected through a procedure when a system reads data, and if all the photoelectric tubes are detected to be normal, the detected values of luminous tubes and the detected values of receiving tubes are contingently saved; according to the detected values of the luminous tubes and the detected values of the receiving tubes, an intermediate value is obtained in the mode that the received minimum value is subtracted from the received maximum value, and the result is divided by 2; the intermediate value is contingently saved to serve as a deviation value to be used; the value of the position of a present character wheel is read through the procedure, the value is compared with the intermediate value, the compare value is substituted into a table lookup function to obtain the current position of the character wheel, and accurate data is computed to be returned the system. It is guaranteed that the water meter can also automatically adjust and judge the electrical level deviation under interference of cloudy water sources and bubbles, the accuracy of data is guaranteed accordingly, the interference influence of the bubbles on light ray conduction is completely solved, and the possibility of erroneous judgment of photoelectric reading is completely eliminated.

Description

technical field [0001] The invention relates to the field of water meters, in particular to a method 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