Answer: To determine the purpose and performance of the pump, you can choose the pump type. This choice must first start with the type and form of the choice of pumps. So what principle is the pump? What is the basis?

1. Make the type and performance of the selected pump meet the requirements of process parameters such as device flow, raising, pressure, temperature, steam flow, and suction process.

2. The requirements of the media characteristics must be met. For pumps that transport flammable, explosive, toxic or valuable media, the shaft seal is required to be reliable or leak -free pumps, such as magnetic driver pumps, diaphragm pumps, and shielding pump pumps that transport corrosive medias. For example, AFB stainless steel corrosion -resistant pump, CQF engineering plastic magnetic driver pump. For the pump containing solid particles medium, wear -resistant materials are required to be used for streaming components.

3. High mechanical reliability, low noise, and small vibration.

4. Economically, the total cost of equipment costs, operating fees, maintenance costs and management fees is the lowest.

5. The centrifugal pump has the characteristics of high speed, small volume, light weight, high efficiency, high flow, simple structure, no pulse in infusion, stable performance, easy operation and convenient maintenance. Therefore, in addition to the following situations, the centrifugal pump should be used as much as possible:

When there are measurement requirements, the measurement of the measurement pump is very high, the traffic is small, and the unsuitable small traffic high high. When the centrifugal pump is available, the re -pump can be selected. When the traffic is large, a shaft flow pump and mixed pump can be selected. When the medium viscosity is large (greater than 650 ~ 1000mm2/s), you can consider choosing a rotor pump or a 75%gas content of the medium of the back pump (gear pump, screw pump). Pump. For cases with frequent or inconvenient pumps, pumps with self -priming performance should be selected, such as self -absorbing centrifugal pumps, self -absorbing vortex pumps, and pneumatic (electric) diaphragm pumps.