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A lot of happy events in the provincial water conservancy and hydrology line (Provincial Hydrology and Water Resources Bureau) +h submersible pump is a kind of submersible electric pump used to draw clean water from wells. Compared with deep-well pump (long-shaft-well pump), it has the advantages of compact structure, easy installation and operation, reliable operation and high efficiency, and is widely used in various sectors of national economic production.
1 Types of Submersible Pumps There are many types and sizes of submersible pumps for use in submersible pumps. In order to facilitate the production and use of submersible pumps, the State has formulated a uniform model and uses pinyin letters and numbers to indicate its structural characteristics, application requirements, and work performance. . Well submersible pumps are represented by QJ. For example, 300Q125-110/5, the meanings of each component are: 1300 indicates that the minimum diameter of the pump is 300mm; 2QJ means that the well is used for diving; 3125 means that the rated flow of the pump is 125m3. /h;4110 indicates that the pump's rated head is 110m; 55 indicates that the pump has five stages, that is, five impellers. The basic operating parameters of submersible pumps for different types of wells are listed in a table to form a selection table for well submersible pumps.
2 Collection of basic information 2.1 Water use data. Including water design flow rate, water flow rate changes over time, water pressure and water quality requirements.
Water information. Including: type of wells, ie wells are shallow or deep wells; diameter and verticality of the wellbore; well depth, depth of deep water and depth of wells; maximum inflow of wells, maximum depth of wells deepens, and the amount of water inflow and descending depth The relationship; well water sediment content, water temperature and pH.
Well submersible pump supply. Understand the supply and use of submersible pumps for local wells, analyze the performance, use requirements, prices, and availability of products from different manufacturers.
Electricity supply situation. Understand the capacity, line layout, voltage reduction, and existing electricity load of the original low-voltage power grid at the well construction site, analyze the power supply modes and the reliability of the power supply that can be used for the newly built well pump station.
3 Selection of submersible pumps for wells Depending on the production requirements, the characteristics of wells and the supply of pump products, the type of well submersible pump can be selected using the selection table.
3.1 primary pump type. According to the diameter of well pipe, according to the principle that the diameter of the well must be consistent with the minimum diameter of the well to which the pump is applied, the selection of the pump type determines the pump type. Such as 250mm diameter, 200QJ type pump can be used. It is generally required that the borehole diameter should be 50~100mm larger than the minimum applicable borehole diameter for the installation and overhaul of the chestnut.
3.2 Select the pump type based on the flow rate. The rated flow of the submersible pump for the selected well should be slightly greater than (or equal to) the flow required for production and not greater than the maximum inflow of water in the well. According to the Baiguishan Reservoir Administration, Henan Province’s Professional Ethics Building + Best Company and Henan Province May 1st Labor Certificate Baiguishan Reservoir is a large-scale water conservancy project that focuses on flood control, taking into account the power generation, irrigation, industrial water, and urban living water. .
In recent years, the Bureau has been awarded the title of National Advanced Unit of the Water Conservancy System, First-level Management Unit of the Ministry of Water Resources, Provincial-level Civilized Unit, and "Top Ten" Unit of Professional Ethics Construction in Pingdingshan City. Recently, Henan Provincial Party Committee Propaganda Department, Provincial Economic and Trade Commission, and Provincial Federation of Trade Unions awarded Henan Province Baiguishan Reservoir Authority the top ten units for the construction of professional ethics in Henan Province. The provincial labor union also awarded the May 1st Labor Certificate of Henan Province.
The Hydrology Division of the Provincial Hydrology and Water Resources Bureau was awarded the National May 1st Labour Award and the staff of the Hydrology Division of the Provincial Hydrology and Water Resources Bureau for its united struggle and forge ahead in order to fully perform the province’s hydrological intelligence forecasting service for the purpose of focusing on scientific research and new technologies The development, promotion and application have completed more than 10 hydrological scientific research achievements. Recently, the All-China Federation of Trade Unions awarded the National May 1st Labour Award to the Hydrology Branch of the Henan Provincial Hydrology and Water Resources Bureau. This requires checking the corresponding contents of the QJ pump selection table and selecting a pump type that meets the flow rate. When the flow rate required for production is greater than the maximum water inflow from the well, the chestnut type should be selected based on the maximum water inflow from the well.
3.3 Calculate the actual water level drop. After the pump type is selected, use the following formula to calculate the actual water level drop depth S: half (m) based on the known data, and the maximum water inflow (Q3/h) pump rating (m3/h) for the Qjia well.
The calculated S value should not be greater than half the water depth in the well, otherwise the pump type should be selected again.
Calculate the length of the water pipe in the well. In order to ensure that the submersible pump works well in the well, the pump body is usually required to be submerged under the dynamic position of 1~2m. Therefore, the length of the water delivery pipe in the well is reduced by (m).
Determine Yang Cheng, who uses the submersible pump. Calculate the vertical distance (m) of the head of the submersible pump for the submersible pump based on the production water requirements and the composition of the water delivery pipe; m The total head loss of the water transmission pipe. In order to provide reliable water supply, the submersible pump is generally used for the well. The total head is 3.6 to determine the impeller stage. According to the calculated total head, check the parameters of the corresponding pump type in the selection table of the submersible pump to determine the number of impeller stages. The rated lift of the selected submersible pump should be approximately equal to the total head so as to avoid energy waste or insufficient water supply.
Conclusion The selection of submersible pumps for wells is an important work for the construction of well pumping stations and involves more content. Whether or not the selection is reasonable affects not only the water supply reliability of the well pumping station, but also the investment and operating costs of the well pumping station, as well as the safety of the well pumping station. Therefore, it must be treated with caution. When choosing the same well, several options should be selected, and the optimal solution should be selected through technical and economic comparison. (:23-01-24) Information Window, Henan Province Water Environment Monitoring Center Worker Xu Kai Honored by Henan Province May 1st Labor Union Henan Province Federation of Trade Unions Granted by Henan Province Water Environment Monitoring Center Workers Xu Kai Henan Province May 1 Labor Medal, Province The labor union and Provincial Department of Labor and Social Security also granted her the title of technical expert in Henan Province.
Yu Jinzhou, Director of the Huaibin Hydrological Station of Henan Province, was awarded the title of Outstanding Employee of Henan Province. Henan Provincial Party Committee Propaganda Department, Provincial Federation of Trade Unions, and Provincial Economic and Trade Commission recently granted the Governor of Huaibin Hydrology Station Comrade Yu Jinzhou the title of Outstanding Employee of Henan Province.
Chen Hongli was awarded as an engineer of the Huangchuan Survey Team of the Hydrology and Water Resources Bureau of Henan Province. A few days ago, the National Organizing Committee for Computer Knowledge Popularization and Application Activities awarded the honorary title of Comrade Chen Hongli, the National Worker's Computer Knowledge for the Popularization and Application of Advanced Individuals.
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