Development Trend and Type Selection and Maintenance Method of Water Supply Equipment

I. Development Trends

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

1, large-scale, large capacity.

2, high-lift, high-speed

3, serialization, generalization, standardization.

4, the level of pumping station automation gradually improve

Correct Selection of 2. Pump

Stainless steel booster pump is a supporting product of reverse osmosis pure water equipment. Stainless steel booster pump is also called multi-stage centrifugal pump, its characteristics are high lift, small flow, wide range of use. Commonly used for vertical structure, the inlet and outlet is located in the pump seat on the same horizontal line, can be directly used in the pipeline. The flow part is made of stainless steel, which can be applied to mild corrosive medium. The shaft seal adopts the mechanical seal of hard alloy and fluorine rubber, which can improve the reliability of the booster pump and the temperature of the conveying medium.

Causes of high energy consumption of water 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 running under the unfavorable working condition of "large flow, low efficiency and high power consumption;

2. For complex systems, the parallel or series operation of pumps is unreasonable, increasing the energy consumption of water transmission;

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

4. Loop leakage, water flow bypass, increase the invalid flow, increase the energy consumption of the pump;

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

6. Pump quality deviation, low efficiency, increase energy consumption.

How to Correct Selection of Water Pump

First, the flow of the selection, in reality, the choice of water pumps, based on the maximum flow, taking into account the normal flow, in the absence of maximum flow, usually desirable 1.1 times the normal flow as the maximum flow. When selecting the pump, the flow rate should not be less than 60% or more 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, we generally need to enlarge the selection of lift by 5%-10%. For reverse osmosis equipment booster pump required lift is based on the selection of the membrane model and flux, operation, raw water quality and water temperature and other circumstances.

The third is the nature of the liquid, to see through the liquid characteristics of the pump, the most basic is to see the chemical properties, will not cause corrosion to the pump.

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

Maintenance method of 3. water pump

1. Inspect vulnerable parts

First check whether the water pump impeller, buckle, shaft sleeve, bearing seat and other wearing parts are in good condition. The good ones can continue to be used, while the bad ones must be reassembled and used after replacing new qualified parts. Damaged and unqualified parts are strictly prohibited.

2. Replace the lubricating oil

Open the oil hole screws inside the sealing chamber and the motor respectively, discharge all the lubricating oil inside the sealing chamber and 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 it is found that the oil is turbid and the water content has exceeded 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 its 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. Under normal circumstances, the sealing box part should not be disassembled as much as possible. If it does need to be disassembled, 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. If wear or excessive clearance is found, new bearings must be replaced in time. It is strictly forbidden to make do with them, so as not to cause greater economic losses.

6. Remove the pump shell to prevent rust

Before use in spring, the pump casing at the top level should be disassembled, and the impeller should be turned on and started again to prevent the components from rusting and burning the motor windings due to abnormal starting. This maintenance is especially important for water-filled motors.

7. Ensure bearing lubrication

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 good lubrication for a long time.