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Simply speaking, water pump energy saving has the following three points:
​ ​ 1. Choose a water pump with high efficiency (η), and the motor power should be as close as possible to the shaft power requirements;
​ ​ 2. Scientific dispatch and optimize unit operation;
​ ​ 3. Use speed regulation technology to reduce the operating power at low loads, such as installing a frequency converter. The following are specific methods to achieve energy-saving water pumps:
Method 1. Frequency conversion: It can only be used for circulating pumps. The water supply and drainage pumps can be said to be useless. Simply speaking, its working principle is that the efficiency of the water pump has a certain margin. The water pump operates under the rated state for a long time. Due to the water consumption of the cooling system in winter and summer, Different, so when the water consumption decreases, the current frequency is reduced through frequency conversion, so that the water output decreases, which is actually a decrease in the rated efficiency of the water pump. In addition, the frequency converter can also consume part of the electricity. Advantages: The circulating pump can save electricity in winter. Disadvantages: The investment is large, and the income is difficult to achieve the promised energy-saving effect. The investment recovery is not significant. Since changing the frequency affects the natural vibration of the water pump and its vibration, cracks are prone to occur.
Method 2. Change the structure: This is mainly achieved by cutting the water pump impeller. The principle is roughly the same as that of frequency conversion. When the demand for water in the cooling system is reduced, cutting the impeller reduces the water output and reduces the input power, which has an energy-saving effect. . The high-efficiency and energy-saving water pump adopts a technical route that combines ternary flow theory with CFD computational fluid dynamics and optimization methods. It starts from considering small hydraulic losses, high efficiency and good cavitation performance, and looks for different combinations of flow and geometric parameters. New high-efficiency energy-saving water pump. The three-dimensional flow theory is to infinitely divide the three-dimensional space inside the impeller. Through the analysis of each working point in the impeller flow channel, a complete and real mathematical model of the fluid flow in the impeller is established. It is designed based on the three-dimensional flow theory. The shape of the blades is an irregular curved surface. The structure of the impeller blades can adapt to the real flow pattern of the fluid and can control the velocity distribution of all fluid particles inside the impeller. Therefore, the operating efficiency of the water pump designed using the three-dimensional flow theory can be significantly improved, with Obvious energy saving effect. Advantages: Can achieve power saving effect. Disadvantages: Large investment, long cycle, inconvenient later operation.
Method 3: Polymer energy-saving technology simply goes in the opposite direction. Since the efficiency of water pumps generally does not reach the rated level, domestic pumps are basically maintained within 70%, and due to cavitation and vortex phenomena, the efficiency is basically lower per 1,000 units. Drop 2-3 points. Polymer technology is to make up for this loss as much as possible. For water supply and drainage pumps, the water output of the water pump increases while the power remains unchanged, and the head is increased, and the running time is reduced, which has an energy-saving effect. For the circulation pump, the internal resistance is reduced, and the motor load power is reduced and the current is reduced. Advantages: Both water supply and drainage pumps and circulation pumps can save energy. Low investment and short operation time can greatly extend the life of the water pump. Disadvantages: This domestic technology is immature and the market is mixed.