[Chinese instrument network meter patent] creative limit, instrumentation invention. Today, we introduced a national invention-issued patent - a photoelectric direct-reading water meter sensor to suppress air bubble interference. The patent was applied for by Shenzhen Chunpu Technology Development Co., Ltd., and was authorized to be announced on October 20, 2017.
Content Description
The invention relates to a photoelectric direct-reading water meter sensor for suppressing the air-bubble interference, which is suitable for a water meter that uses photoelectric technology to encode and output an electric signal displayed by a mechanical counter, especially an opto-electronic direct-reading wet-type water meter.
Background of the invention
The water meter is divided into two types: dry water meter and wet water meter. At present, there is an automatic remote meter reading technology that uses a photoelectric sensor assembly to read the meter reading information, ie, a photoelectric direct reading sensor device. Read the sensor directly. The device through the original mechanical counter device counter word wheel for technical transformation, in the counter word wheel according to a certain coding law, the production of code bar, the use of photoelectric sensor components, the counter word wheel on the "0" - "9" ten The digital data is converted into a digital coded signal. Through the interface, the readings are directly output to the remote meter reading device. The direct reading device does not need power supply at ordinary times. It only needs to be powered instantaneously when the meter is read, thus solving the problem of long-term power supply in the previous pulse meter reading system. problem.
With the development of technology, photoelectric direct reading technology has developed rapidly in recent years. Because of the water metering and transmission of dry water meters, a magnetic sensor is installed, the accuracy is low, and the flow rate is increased over time. The measurement accuracy is getting lower and lower, which also affects the use and promotion of dry meters. However, the existing photoelectric direct-reading sensors for wet-type water meters have obvious disadvantages: they are prone to air bubbles, especially in wet-type water meter liquid sealing boxes. When there are bubbles in the code bar or in the code slot, when the light emitted by the light emission tube passes, refraction or the like easily occurs, so that the intensity of light irradiated to the light receiving tube is reduced, so that the photosensitive current of the light receiving tube is reduced, resulting in sensor coding. Errors lead to reading errors due to air bubble interference. Currently, the industry has no effective solution to air bubble interference. Due to the limitation of air bubble interference, it is difficult to promote the use of photoelectric direct-reading wet water meters.
Summary of the Invention
The invention is designed to provide a photoelectric direct-reading water meter sensor method for suppressing air bubble interference, a water meter for photoelectrically outputting an electric signal encoded by readings displayed by a mechanical counter, and an optoelectronic direct-reading wet-type designed by using the method. Water meter anti-bubble interference ability, at the same time with a low cost, stable performance, the use of electronic components with fewer features.
The figure is a schematic diagram of the principle of induction of a pair of photoelectric tubes according to an embodiment
The method for suppressing air bubble interference provided by the photoelectric direct-reading water meter sensor provided by the present invention includes: a single-chip computer, a communication interface component, a direct-current power supply component, and a plurality of photoelectric sensors of photoelectric sensors composed of a plurality of pairs of photosensitive receiver tubes and light-emitting tube pairs. Decoder components, photosensitive receiver sampling resistor control circuit components, which microcontroller built-in ADC module (analog converter module), photosensitive receiver sensing signal sampling resistance from the control of the two sampling resistors (R1, R2), The sampling resistor control circuit of the photosensitive receiver tube controls the sampling resistor of the photosensitive receiver tube to switch between a single sampling resistor (R2) and two series connected resistors (R1+R2), so that the resistance of the photosensitive receiver tube sampling resistor is at R2 and R1 + R2 switch between, by adjusting the photosensitive receiver sampling resistance, to adjust the sensitivity of the photosensitive receiver tube to achieve the effect of suppressing the air bubble interference.
The advantages of the invention are as follows: 1. Only by adjusting the resistance of the sampling resistor, the sensitivity of the receiving sensing of the photosensitive receiver Q can be corrected, and when the optical channel encounters the air bubble interference, the decoding of the photoelectric direct reading sensor is normal. 2. With fewer devices, it has the characteristics of small space and low cost.
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