How can the centrifugal series pumps be energy-saving during production or selection in the factory? The following points are the energy-saving measures for the centrifugal series pumps.
Energy-saving measures for centrifugal pumps:
① Select the appropriate type of pipeline centrifugal pump, use the correct method to calculate the required flow and head of the pipeline, and make the rated flow and head of the selected pump type equal to or greater than the required flow and head of the pipeline. To make the centrifugal pump work in a high-efficiency area, the greater the flow and head margin of the centrifugal pump, the lower the working efficiency.
② Reduce the resistance of the pipeline and reduce the head required by the pipeline. From Bernoulli’s equation, the head of the pump required by the pipeline is known as the head of the pump required by the pipeline.
The first term (Z2-Z,) and the second term in the formula are determined by the working conditions, and the third term is determined by the structure of the pump and cannot be changed at will. If you want to reduce the required head, you can only consider the fourth item. The main feasible measures to reduce pipeline resistance are to appropriately increase the diameter of the pipe diameter to avoid installing unnecessary valves, instruments, etc. The pipeline should be as straight as possible, with as few turns as possible, and pipes with a smooth inner surface should be used. Clean up debris and scale in the pipeline in time.
③Improving the impeller structure is to improve the function of the impeller, improve the structure of the pump body, and reduce the energy loss of the fluid in the centrifugal pump. The purpose of improving the structure of the impeller is to improve the liquid and the flow state in the impeller, so that the flow is stable, there is no eddy current, and the impact loss and friction loss are greatly reduced to a minimum.
In fact, theoretically, the more blades of the impeller, the smaller the thickness of the blades, and the higher the efficiency of the impeller to work on the liquid. The more blades, the narrower the area of the liquid flow passage in the impeller, and the flow of fluid through the impeller At this time, the greater the resistance, the smaller the thickness of the blade, the lower the strength of the blade, the easier it is to damage, and the more difficult it is to manufacture. The idea to solve this problem is to ensure that there is enough flow channel area in the impeller under normal use, and to appropriately increase the number of blades.
The leakage in the centrifugal pump and the unevenness of the pump casing surface are also one of the reasons for the energy loss. For this reason, it is necessary to replace the excessively worn seal ring in time to reduce internal leakage, polish the flow channel, and make the flow channel guide surface smooth , Reduce the loss of hydraulic power in the pump, and clear the blockages such as sand, stone, cast iron residue, etc. in the pump.
④ Reduce the diameter of the impeller and reduce the speed of the impeller. When the flow and head of the pump are large and there is no more suitable pump available, you can turn the impeller, reduce the outer diameter of the impeller, or reduce The speed of the impeller is used to reduce the shaft power of the pump and reduce the power consumption. After the outer diameter of the impeller is cut, or the speed of the impeller is reduced, the shaft power of the pump drops quickly.
After the impeller is cut or the speed is reduced, because the shaft power is reduced, a smaller motor should be replaced, otherwise it is difficult to achieve the purpose of energy saving.
In addition, it is necessary to strictly implement the assembly technical requirements of the centrifugal pump, maintain the good operating performance of the centrifugal pump, strengthen daily maintenance, and replace the excessively worn parts in time. This is also an important step in the energy saving of the centrifugal pump.
Post time: 2022-01-06
