Combined water supply method of secondary water supply high-level water tank and low-level water tank

Abstract

The invention discloses a combined water supply method for secondary water supply high-level water tanks and low-level water tanks. The combined water supply method comprises the steps: 1, calculating the theoretical remaining water amount of each high-level water tank at the starting moment of different time periods of one day of a workday or a rest day; 2, calculating the theoretical inflow water quantity of each high-level water tank in different time periods of the workday or the rest day at the starting time of different time periods of the workday or the rest day, and controlling water supply to each high-level water tank according to the theoretical inflow water quantity; 3, calculating the outflow water amount of the low-level water tank and the theoretical remaining water amount of the low-level water tank at the starting moment of different time periods of one day of a workday or a rest day; and 4, calculating the theoretical inflow water quantity of the low-level water tank in different time periods of the workday or the rest day at the starting time of different time periods of the workday or the rest day, and controlling water supply to the low-level water tank according to the theoretical inflow water quantity. The risk that microbial indexes exceed the standard due to the fact that tap water stays in the water tank for a long time can be effectively reduced.

Description

technical field [0001] The invention relates to the field of secondary water supply of urban water supply pipe network systems, in particular to a combined water supply method of a high-level water tank and a low-level water tank for secondary water supply. Background technique [0002] Secondary water supply refers to the form of water supply in which urban public water supply is stored, pressurized, and then supplied to users through pipelines. The drinking water (hereinafter referred to as tap water) in the secondary water supply and storage equipment (hereinafter referred to as the water tank) is extracted by a water pump or automatically flows in from the urban water supply pipe network system. The inlet flow of the water tank refers to the flow of tap water at the inlet of the water tank at a certain moment; the outlet flow of the water tank refers to the flow of tap water at the outlet of the water tank at a certain moment; the inflow of the water tank refers to the v...

AI Technical Summary

Problems solved by technology

The most common problem of secondary water supply is that the tap water stays in the water tank for too long, which leads to the attenuation of the residual chlorine concentration in the tap water of the water tank to a too low level, so that the microorganisms in the tap water of the water tank can grow rapidly, causing the microbial index of the tap water in the water tank to exceed the standard

[0007] 1) This technology does not distinguish between working days and rest days when statistically analyzing the characteristics of water use. In practice, the water use characteristics of working days and rest days are completely different. For some places, such as schools and office buildings, the Water consumption is much higher than that on rest days, especially during the time period of 6:00-20:00. The average water consumption on working days is several times (3-5 times) the average water consumption on rest days. Statistical analysis is carried out on daily and working days. If the obtained average water consumption is used for water supply control on rest days, it will be obviously too large, which will lead to excessive water storage and completely lose the effect of controlling water supply. Using the resulting average water consumption for water supply control The water supply control on weekdays is relatively small, which may easily lead to insufficient water storage

[0008] 2) The final calculation result of this technology is the inlet flow. It is intended to control the residence time of tap water in the water tank by controlling the inlet flow. However, it is difficult to accurately control the inlet flow in practice, which limits the practical application of this technology.

[0009] 3) This technology does not consider the problem of the invalid volume of the water tank. Since some deposits will gradually remain at the bottom of the water tank, in order to prevent these deposits from flowing out to the user with the outlet pipe of the water tank, the outlet pipe is deliberately closed when installing the outlet pipe of the water tank. Raise it to a certain height from the bottom of the water tank. Usually, the vertical distance between the lower edge of the water outlet pipe and the bottom of the water tank is 10-20cm. Therefore, the water stored below the lower edge of the water outlet pipe of the water tank will not be able to flow out with the water outlet pipe. This part cannot be used. The volume of the water tank used is called the invalid volume. In addition, for the water tank that uses the water pump to control the water outlet of the water tank, if the water outlet pipe is empty, the water pump will be damaged due to dry pumping. In order to prevent the water outlet pipe from being empty, the liquid level cannot be lower than the outlet pipe. The upper edge, in this case, the invalid volume is larger. If the invalid volume of the water tank is not considered when calculating the theoretical water retention, the calculated theoretical water retention will not meet the actual water consumption needs, and water supply will be insufficient if the water supply is controlled accordingly. question

[0010] 4) Each water tank is designed with an overflow pipe. The height between the overflow pipe and the bottom of the water tank is the maximum liquid level of the water tank. When the liquid level of the water tank reaches the maximum liquid level, if you continue to add water, the tap water will It will flow out from the overflow pipe. This technology does not consider the treatment method when the liquid level of the water tank reaches the highest level when the water is supplied to the water tank, so once this happens, tap water will be wasted

[0011] 5) This technology adopts an average division of time periods, which loses the flexibility of water supply management. In practice, it is necessary to divide the time periods shorter during peak water consumption periods to ensure sufficient water storage. Also refer to the division rules of the time period as in the peak water consumption period, it will often happen that the water supply needs to be shut down within a short time after the water supply is started, and the frequent startup and shutdown of the water pump will reduce the service life of the pump

[0012] 6) This technology does not consider the processing method when data is missing when statistically calculating the characteristics of water use. In practice, data missing may occasionally occur, such as sudden power failure, cleaning of water tanks, equipment maintenance or equipment failure, etc. If there is data missing, it will still Using the data of this day to calculate the characteristics of water use, the calculation results will be inaccurate or even seriously distorted

[0013] 7) This technology uses the average outlet flow to represent water characteristics, which is not very appropriate

[0014] 8) This technology makes it clear that the outlet flow is obtained through the outlet flowmeter, but in some cases it is difficult to install the outlet flowmeter on the outlet pipe of the water tank. For example, the ultrasonic flowmeter requires that the measured water pipe has no joints and elbows within a certain length range. Many outlet pipes cannot meet this condition. In addition, for water tanks that use variable frequency pumps to control water supply, there are usually multiple outlet pipes. At this time, the outlet water flow of the water tank is the total flow of all outlet pipes. labor and money

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