多级离心泵的选型及特点

Category: Water pump knowledge

2024-06-05

The working principle of multi-stage centrifugal pump is similar to that of single-stage centrifugal pump, but the difference is that the number of impellers is large. When the motor drives the pump shaft to rotate, the blades in the impeller are subjected to centrifugal force during the rotation, and the liquid is thrown out from the center of the impeller and enters the pump housing. A low pressure area is formed in the central part of the impeller, and the fluid is sucked into the pump under the action of pressure. After the action of multiple impellers, the fluid is discharged under the action of pressure.

Multistage centrifugal pump is composed of pump body, rotor, impeller, bearing, seal and so on. The pump body is the main part of the multi-stage centrifugal pump, which contains multiple impellers inside, and each impeller is composed of multiple blades.

Multi-stage pumps are mainly used for mine drainage, urban and factory water supply. Relative to the piston pump, diaphragm pump and other reciprocating pump, can send a larger flow. Multi-stage centrifugal pump has high efficiency and can meet the needs of high lift and high flow conditions. It has been widely used in petrochemical, chemical, electric power, construction, fire protection and other industries.

1. features

1. Convenient maintenance: Although the structure of the multi-stage centrifugal pump is more complicated, its maintenance is relatively convenient. Generally speaking, it is only necessary to regularly check and replace the bearings, seals and other components.

2. Flow stability: The flow of multi-stage centrifugal pumps is generally stable and will not be affected by many factors like single-stage centrifugal pumps, such as pump speed, medium temperature, etc.

3. High operating efficiency: Due to the complex structure of the multi-stage centrifugal pump, its operating efficiency is relatively high. In many industrial fields, the operating efficiency of multi-stage centrifugal pumps can reach more than 80%.

4. High head: Since the impellers of the multi-stage centrifugal pump are connected in series, the head can be greatly improved. In general, the head of a single-stage centrifugal pump is about 100 meters, while the head of a multi-stage centrifugal pump can reach hundreds of meters or even kilometers.

2. selection

When choosing a multistage centrifugal pump, it needs to be selected according to actual needs. In general, the following aspects need to be considered:

1. Brand and price: brand and price need to be considered. Generally speaking, the price of well-known brands is relatively high, but the quality and after-sales service are also better.

2. Flow and head: The flow and head need to be determined according to actual needs. Generally speaking, the flow rate refers to the volume of fluid per unit time, and the head refers to the height of the fluid in the pump.

3. Power supply and voltage: The power supply and voltage need to be considered. Generally speaking, single-phase power supply can drive motors below 220V, while three-phase power supply can drive motors above 380V.

4. Medium characteristics: need to consider the characteristics of the fluid, such as density, viscosity, corrosion and so on. These factors will affect the performance and service life of the pump.

5. Operating environment: It is necessary to consider the operating environment of the pump, such as temperature, humidity, dust, etc. These factors will affect the performance and service life of the pump.

Multistage centrifugal pump is a kind of excellent performance pump, with higher head and efficiency, suitable for conveying high pressure, large flow of liquid. It is widely used in various fields and provides important support for industry, agriculture and people's livelihood.

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