1. Development trend

　　With the continuous improvement of water pump design and manufacturing technology and application technology, the manufacture and production of water pumps are developing in the direction of large-scale, large-capacity, high-lift, high-speed, serialization, generalization, and standardization. The level of automatic control of pumping stations is getting higher and higher.

　　1. Large-scale and large-capacity

　　2. High lift and high speed

　　3. Serialization, generalization and standardization

　　4. The automation level of the pumping station is gradually improved

　　Second, the correct selection of supporting water pumps

　　The stainless steel booster pump is a supporting product of reverse osmosis pure water equipment. The stainless steel booster pump is also called a multistage centrifugal pump. It is characterized by high lift, small flow rate and wide application range. The vertical structure is commonly used, and the water inlet and outlet are located on the same horizontal line as the pump base, which can be directly used in the pipeline. The flow part is made of stainless steel, which is suitable for mildly corrosive media. The shaft seal part adopts hard alloy and fluorine rubber mechanical seal, which can improve the reliability of the booster pump during operation and the temperature of the conveying medium.

　　Reasons for the high energy consumption of the pump during operation

　　1. The water pump and the pipeline do not match, the "big horse-drawn trolley phenomenon" is serious, and the water pump is operating under the unfavorable working conditions of "large flow, low efficiency, and high power consumption";

　　2. For complex systems, the configuration of water pumps running in parallel or in series is unreasonable, which increases the energy consumption of water delivery;

　　3. The abnormal phenomenon of high local resistance of the pipeline due to design, construction or operation reasons increases the energy consumption of water delivery;

　　4. Loop leakage and water flow bypass increase invalid flow and increase pump energy consumption;

　　5. The circuit resistance of the system is seriously unbalanced, which increases the energy consumption of the main engine and the energy consumption of the water pump;

　　6. The quality of the water pump is deviated, the efficiency is low, and the energy consumption is increased.

　　How to choose the correct type of water pump

　　First, the selection of the flow rate. In reality, when selecting a water pump, the maximum flow rate is taken as the basis and the normal flow rate is taken into consideration. When there is no maximum flow rate, 1.1 times the normal flow rate can usually be taken as the maximum flow rate. When selecting a pump, the flow rate should not be lower than 60% or greater than 125% of the design flow rate of the pump, otherwise it is easy to break the shaft and work unstable, especially for high-lift pumps.

　　Second, for the selection of the head, we generally need to enlarge it by 5%-10% to select the head. The lift required by the booster pump for reverse osmosis equipment varies according to the type and flux of the selected membrane, operating conditions, raw water quality and water temperature, etc.

　　The third is the nature of the liquid. It depends on the characteristics of the liquid passing through the pump. The most basic thing is to look at the chemical properties, whether it will cause corrosion to the pump.

　　Finally, some factors on the actual site should be considered, such as the layout conditions of the on-site pipelines, the specifications and length of the pipelines. Only after understanding the actual situation on the site, the selection will be more professional.

　　3. Maintenance method of water pump

　　1. Check the wearing parts

　　First check whether the water pump impeller, retaining ring, shaft sleeve, bearing seat and other wearing parts are in good condition. Good ones can continue to be used, and bad ones must be reassembled after replacing with new qualified parts. It is strictly forbidden to use damaged and unqualified parts.

　　2. Replace lubricating oil

　　Open the oil hole screws inside the sealing chamber and the motor respectively, release all the lubricating oil in the sealing chamber and the inside of the motor, and replace with new oil to ensure the normal operation of the lubrication system.

　　3. Ensure sealing

　　When replacing the lubricating oil in the sealing chamber, if the oil is found to be turbid and the water content exceeds the standard, the overall sealing box or dynamic and static sealing rings must be replaced, and the replaced parts must be qualified products to ensure their sealing performance.

　　4. Remove moisture

　　For motor windings with an insulation resistance value lower than 0.5 megohms, moisture must be removed, and the drying method is the same as that of ordinary motors. If the sealing box does not need to be replaced, only the stator part of the electric pump can be removed. In general, the sealing box part should not be disassembled as much as possible. If it is really necessary to disassemble, the "O"-shaped rubber sealing ring must be replaced with a new one. .

　　5. Check the bearing

　　Check the upper and lower bearings of the motor part. If wear or excessive clearance is found, new bearings must be replaced in time. It is strictly forbidden to make do with it, so as not to cause greater economic losses.

　　6. Remove the pump casing to prevent rust

　　Before spring use, the uppermost pump casing should be disassembled, and then the switch should be closed and started after turning the impeller, so as to prevent the parts from rusting and failing to start normally and burning the motor windings. This maintenance is especially important for water-filled motors.

　　7. Make sure the bearings are lubricated

　　For water-filled submersible pumps, check and replace the skeleton oil seals and lithium-based grease in the bearing chambers of the upper and lower end covers to ensure that the bearings run normally under long-term lubrication.