Answer: The centrifugal pump is divided into: vertical pump and horizontal pump according to its structural form. The characteristics of the vertical pump are: small buildings in the area are convenient for small installation. The disadvantage is: the center of gravity is high, and it is not suitable for running without fixed foot occasions. Features of horizontal pumps: Wide in terms of use is widely stable. The disadvantages are: large area, large construction investment, large volume, and heavy weight. For example: vertical pumps are pipe pumps, DL multi -level pumps, submersible pumps and other horizontal jump IS pumps, D -type multi -stage pumps, SH type dual -suction pumps, B, BA, IH, IR type. According to the requirements of the raising flow, and the number of levels and the number of composition is divided into:

① Single -level single -suction pump: The pump is a leaf wheel, and an inlet is sucking on the impeller. General flow range: 5.5-2000 meters 3/h, the raising is: 8-150 meters, characterized by: small flow and low raising.

②, a single -stage dual -suction pump: The pump is a leaf wheel, and the impeller is the secondary entrance. General flow range: 120-20000 meters 3/h, the raising is: 10-110 meters, the traffic is large and the raising is low.

3. Multi -stage pump: Pump is multiple impeller. The first impeller is suck the inlet, and the first impeller discharge chamber is the second lobe inlet, and so on. The general flow range is: 5-200 meters 3/h, the raising is 20-240 meters, which is characterized by small traffic and high raising.