Abnormal causes and solutions of sewage flow meter

Abstract: The abnormal causes and solutions of sewage flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abnormal causes and solutions of sewage flowmeter: Sewage flowmeter is a measuring instrument that measures the cumulative volume of water flow in the pipeline. At present, most of the sewage flowmeters in various enterprises use electromagnetic flowmeters, which are a kind of speed water meters and use Faraday. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the abnormal causes and solutions of sewage flowmeters. Abnormal causes and solutions of sewage flowmeter: sewage flowmeter is a measuring instrument for measuring the cumulative volume of water flow in the pipeline. At present, most of the sewage flowmeters in various enterprises use electromagnetic flowmeters, which are speed-type water meters and adopt the principle of Faraday's law of electromagnetic induction. There are many phenomena and reasons for the abnormal measurement of the flowmeter. I will analyze the characteristics of the water supply pipe network and the flowmeter itself in combination with the actual work. There are mainly the following phenomena and reasons: Phenomenon 1: Many users' water meters are not in use. There is a slow rotation phenomenon in the water. It is manifested in the fact that when the starting pointer of the water meter appears, it stops when it goes, and sometimes advances three times and retreats one circle. This phenomenon is more obvious during the peak period of water consumption. We call it the phenomenon of water meter rotation. Reason (1): Water pressure fluctuation According to the working principle of the water meter, we know that the water meter relies on the kinetic energy generated by the flow of water in the meter to push the impeller to rotate, thereby driving the meter device to measure. In the case of no water, the water pressure in the pipes connecting both ends of the water meter is balanced.“One household one table”After the renovation, the water meters of the same unit are basically installed in one place, and the distance is relatively close. Whenever the valve of the adjacent user is opened instantaneously, the original pressure balance is destroyed, the pressure in the pipe before the meter connecting the main pipe is lower than the pressure in the pipe behind the meter, and the water under pressure behind the meter expands due to the decrease in the pressure in front of the meter, and there will be a small amount of pressure. The water flows through the water meter and hits the impeller, forming a reverse rotation and balancing the pressure. When the valve is closed suddenly, the water pressure in the front pipe of the meter will increase rapidly. At this time, the pressure in front of the meter is greater than the pressure behind the meter, and the water behind the meter will shrink due to the pressure. At this time, a small amount of water will flow through the water meter, forming a positive turn to reach a new pressure balance. Due to the influence of the structure of the water meter, the resistance that flows through the water meter from different directions is different. Although the water intake is the same, the rotational speed of the impeller is very different, and the forward rotation is faster than the reverse rotation. However, when there is no air in the pipeline, the resulting water volume is less, generally no more than 1m3 per month. In fact, the most fundamental reason for the rotation of the water meter caused by the fluctuation of water pressure is the existence of air in the pipeline. We know that gas has strong compressibility. When the water pressure increases, the air is squeezed by the water flow at the high points of the pipes or water appliances to form compressed gas. At this time, the water pressure and the air pressure are equal and in balance; When the pressure decreases, the air pressure is greater than the water pressure, and the compressed gas expands, pushing the water to flow back, and so on, thereby generating the water flow movement and driving the impeller to rotate. For most water meters, the number of forward rotations is greater than the number of reverse rotations, and the gas is highly compressible. If there is air in the pipeline behind the meter, the expansion and contraction space will be large due to the fluctuation of water pressure. The amount of water produced by this is relatively large; when the adjacent users use water frequently, the amount of extra water produced is as little as (2-3) m3 per month, and as large as ten cubic meters. In fact, there are many situations that cause air stagnation in the pipeline. For example, a large amount of gas will be dissolved in the production and water supply process of tap water. At the same time, in the pipeline maintenance construction, the replacement of the water meter and the transformation of the pipeline will also bring in the gas. There will also be gas left in the pipe network in the area where the water is cut off, as well as in the solar water heater and the end of the pipe. Measures: 1. Install a check valve In order to prevent the impact of water pressure fluctuations on the measurement of the water meter, installing a one-way check valve in front of the meter can prevent the backflow of water. When the water pressure in front of the meter is greater than the pressure behind the meter, the water behind the meter is compressed, and the water meter rotates forward; when the water pressure in front of the meter drops, the check valve is automatically closed under the action of the pressure behind the meter, and the water meter does not rotate. ; When the water pressure in front of the meter rises again, as long as the pressure does not exceed the pressure behind the check valve, the water meter will not turn again. Therefore, installing a one-way check valve can reduce the frequency of water meter rotation, and can also solve the problem of abnormal water meter measurement caused by water pressure fluctuations. 2. Evacuate the air in the pipe. Since the air in the pipe has a great influence on the measurement of the water meter, it is necessary to exhaust the household meter of the newly installed or modified pipe. When exhausting, the valves of all water equipment should be opened one by one, and the air in the pipe should be exhausted as much as possible to reduce the gas content in the water. Avoid gas mixing into the pipe due to water outage, and water meter rotation due to water pressure fluctuations in the pipe network. Reason (2): The installation is not standardized now“One household one table”Most of the renovations will install the household meter of the same unit in the same place on the first floor. Considering the beauty, economy and convenience of meter reading, usually use aΦ40mm～ΦThe 50mm pipe is connected to 6 to 12 water meters, and the distance between the meters is small, and the straight pipe section connected to the water meter is also short [2]. In addition, the water meter is too close to the main pipe during installation. The water pressure of the pipeline fluctuates and the measurement is abnormal.

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