1. The efficiency of the pump itself is the most fundamental effect. Under the same working conditions, the efficiency of the pump may differ by more than 15%.
2. The operation condition of the centrifugal pump is lower than the rated condition of the pump, with low pump efficiency and high energy consumption.
3. The efficiency of the motor is basically unchanged in use. Therefore, it is important to select a high efficiency motor to turn off.
4. The influence of mechanical efficiency is mainly related to design and manufacturing quality. After the pump is selected, the later management has little influence.
5. Hydraulic loss includes hydraulic friction and local resistance loss. After the pump runs for a certain period of time, it inevitably causes the surface wear of impeller, guide vane and other components, increases the hydraulic loss and reduces the hydraulic efficiency.
6. Horizontal centrifugal water pump volume loss is also called leakage loss, including impeller seal ring, interstage, axial force balance mechanism three leakage losses. The volume efficiency is not only related to the design and manufacture, but also to the later management. After continuous operation of the pump for a certain period of time, due to the friction between the components, the clearance increases and the volumetric efficiency decreases.
7. Due to the blockage of the filter cylinder and the intake of the pipeline, the centrifugal pump is vacuuming and idling.
8. Before the start of the pump, the staff did not pay attention to the preparatory work before the start of the centrifugal pump, and the basic operating procedures such as warm-up pump, disk pump and filling pump were not thoroughly implemented, which often caused cavitation of the pump, resulting in large pump noise, large vibration and low pump efficiency.
1. Replace the inefficient centrifugal pump. During the replacement, the centrifugal pump which is close to the actual operating condition parameters is selected to ensure that the replaced pump always operates in an efficient state. After replacing the low efficiency and high consumption centrifugal pump, the pump efficiency can be increased by about 10%.
2. Application of frequency conversion energy saving technology. For the centrifugal pump whose design parameters are larger than the actual operating conditions, after the installation of variable frequency speed control device, it always runs in the high efficiency area.
3. In the main centrifugal pump to promote the application of high-efficiency energy-saving permanent magnet speed motor and dual power motor and other new energy-saving products.
4. When selecting a new pump, the pump produced by a large manufacturer should be selected to ensure the high efficiency of the centrifugal pump.
5. Maintenance of centrifugal pump.
(1) It is necessary to check and adjust the shaft end seal of centrifugal pump frequently to reduce the volume loss;
(2) When the centrifugal pump has been running for 10000 hours, it should be overhauled to restore the pump efficiency;
(3) The bellows sealing technology is widely used in centrifugal pump to eliminate the leakage and improve the volume efficiency.
6. Clean the filter cylinder regularly, check the pipeline connection, and ensure that the inlet pipeline of the centrifugal pump is smooth.
7. In strict accordance with the operating procedures of centrifugal pump, before starting the pump, it is necessary to disc the pump, open the inlet valve, close the outlet valve, exhaust and vent, and check whether the inlet pressure of the pump meets the requirements. Prevent pump cavitation caused by low supply pressure and insufficient flow.
8. The pump efficiency of centrifugal pump shall be tested regularly. For the pump set with low pump efficiency, the causes shall be found out in time and corresponding measures shall be taken to solve them.
