What are the features of centrifugal pumps？Today we will talk about this question.
In petroleum and petrochemical production enterprises, a large number of centrifugal pumps are used. In other sectors of the national economy, centrifugal pumps are also widely used。
The centrifugal pump is generally driven by the motor. Before starting the centrifugal pump, the pump body and suction pipe are filled with liquid. When the impeller of centrifugal pump rotates at high speed, the impeller drives the liquid among the blades to rotate together. Due to the centrifugal force, the liquid is thrown from the center of the impeller to the outer edge of the impeller (the flow rate can be increased to 15-25m / s), and the kinetic energy also increases. When the liquid enters the pump casing, as the flow passage in the volute pump casing gradually expands, the liquid flow rate gradually decreases, and part of the kinetic energy is converted into static pressure energy, so the liquid flows out along the discharge outlet with high pressure. At the same time, a certain vacuum is formed at the center of the impeller due to the liquid being thrown out, and the pressure Pa at the liquid level is higher than that at the center of the impeller. Therefore, the liquid in the suction pipeline enters the centrifugal pump under the action of the pressure difference. The impeller keeps rotating, and the liquid is continuously drawn in and out. Because the centrifugal pump can transport liquid mainly by the centrifugal force, it is called centrifugal pump.
Single stage single suction centrifugal pump features:
The single-stage single suction centrifugal pump is a kind of widely used centrifugal pump with reliable operation, simple structure, easy manufacturing and processing, convenient maintenance and strong adaptability. One end of the pump is supported by a bearing in the bracket, and the other end of the impeller is cantilevered out of the bracket.
According to the different split positions of centrifugal pump body and pump cover, it can be divided into front open type and back open type structures. The advantage of the rear open pump is that the bracket can be taken out together with the impeller as long as the bracket stop nut is loosened during maintenance. It is unnecessary to dismantle the inlet and outlet pipes of the pump.
According to the different split positions of pump body and pump cover, it can be divided into front open type and back open type structures. The advantage of the rear open pump is that the bracket can be taken out together with the impeller as long as the bracket stop nut is loosened during maintenance. It is unnecessary to dismantle the inlet and outlet pipes of the centrifugal pump.
Structural features of double suction centrifugal pump:
1. Beautiful appearance, good stability, easy to install. The motor can be on the left end or the right end as required. The double suction centrifugal pump is a split structure in the pump shell. When overhauling, just lift out the pump cover, the rotor parts can be moved out for overhauling without dismantling the pipeline, which is very convenient.
2. Mechanical seal or packing seal shall be selected for shaft seal. Ensure no leakage for a long time. The impeller seal ring can be replaced after wearing, which reduces the operation and maintenance costs.
3. The optimized design of double suction impeller reduces the axial force to the minimum, which is hydraulic symmetrical and has no axial force (theoretically). Because the double suction impeller has two suction inlets, each inlet only needs to bear half of the flow, so the flow rate is relatively low, and the impeller of centrifugal pump is not easy to cavitation.
4. High efficiency, large flow and high lift. But centrifugal pump is bulky and bulky, so it is generally not suitable for mobile operation. It is mainly used in factories, mines, urban water supply and drainage.
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