1. According to the working principle and structure of […]
1. According to the working principle and structure of the pump:
Vane pumps, positive displacement pumps (and other types of pumps) such as: jet pumps, air lift pumps, electromagnetic pumps, vacuum pumps, etc.
Vane pumps such as: centrifugal pumps, vortex pumps, mixed flow pumps, axial pumps, screw pumps, etc.
Positive displacement pumps such as reciprocating pumps and rotor pumps
Reciprocating pump: electric pump, steam pump
Electric pump: plunger (piston) pump, diaphragm pump, metering pump
Rotor pump: gear pump, screw pump, Roots pump, slide pump, etc.
2, according to the media on the points:
Clean water pump, sewage (dirt) pump, oil pump, corrosion-resistant pump, lining fluorine pump, sewage pump, oil drum pump, etc.;
3, from the use of installation methods:
Pipeline pump, submerged pump, submersible pump, magnetic pump, etc.
After determining the flow meter and design head of the pump station, you can use the relevant technical chart to determine the pump model and specifications. The method is as follows:
First, use the pump performance specification table to select the pump type
The pump factory provides this form in the catalogue. The performance of each model in the table has three lines of data. Which one is the correct one? The general design flow and design head should be consistent with the values in the middle row listed in the performance table, or close to each other, and must fall within the upper and lower rows, because this range is the high efficiency area of the pump operation. This type of pump is considered to be in line with actual needs, and the pump is selected.
Second, use the pump selection table to select the pump type
According to the determined design head and design flow, in the selection table, the horizontal head looks for the head value that is consistent with or close to the design head; and then finds the flow value that is consistent with or close to the design flow in the vertical head. Vertical and horizontal intersect in the small square, it marks the model of the pump, initially selected multi-stage pump type. However, there are occasions when both pump types meet the design requirements. In this case, the two pump types can be compared for technical and economic analysis, and then one of the appropriate pump types is selected. This method of selecting a water pump is relatively simple and quick.
Third, the use of pump performance comprehensive spectrum selection pump type
The working areas of the centrifugal pump, the axial flow pump, the chemical pump and the mixed flow pump are all drawn on the same picture, which constitutes a comprehensive spectrum of the agricultural water pump series. The drawing is more complicated, but it is more convenient to use according to the determination. Design flow and design lift. On the type spectrum, firstly, on the ordinate, use the design lift to find several pumps that meet the head requirements and flow rates, and then use the design flow on the abscissa to determine which one to use. Water pump. If the design flow is large, the single pump fails to meet the requirements, and multi-machine operation can be considered, but it should be noted that the same type of water pump should be used as much as possible to facilitate construction, installation and maintenance.