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How to choose the model and specifications of the water pump correctly?

How to choose the model and specifications of the water pump correctly?

2020-06-29

Classification of water pump 

1. According to the working principle and structure of water pump: vane pump, positive displacement pump (and other types of pumps) such as: jet pump, air lift pump, electromagnetic pump, rotary vane vacuum pump, water ring vacuum pump and other vane pumps Such as: positive displacement pumps such as centrifugal pumps, vortex pumps, mixed flow pumps, fuel pumps, screw pumps, such as: reciprocating pumps, rotor pumps, two reciprocating pumps: electric pump, steam pump electric pump: plunger (piston) pump, diaphragm pump , Metering pump rotor pump: gear pump, screw pump, roots pump, sliding vane pump, etc.


2. According to the medium, it is divided into: clean water pump, sewage (dirt) pump, oil drum pump, corrosion-resistant pump, diaphragm pump magnetic pump sewage pump centrifugal pump screw pump oil pump, etc.;


3. In terms of installation methods: diaphragm pump, oil pump, fuel pump, magnetic pump, oil drum pump, hand pump, centrifugal pump, multi-stage pump, etc.


After determining the design flow and design head of the water pump station, you can use the relevant technical chart to determine the pump model and specifications. The method is to use the pump performance specification table to select the pump type. The water pump factory provides this table in the product catalog. The performance of each model in the table has three rows of data. Which one is correct? 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 on the Within the range of the next two lines, 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 considered to be selected. 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 finds the head value that is consistent with or close to the design head; then find the design flow in the vertical head The flow values that are consistent or close to each other intersect each other in a small square, which indicates the type of the pump, and the pump type is initially selected.


But sometimes there are two types of water pumps that meet the design requirements. At this time, you can compare the two types of pumps for a program, perform a technical and economic analysis, and then select one of the appropriate pump types. This method of selecting a pump is relatively simple and fast. Use the pump performance comprehensive spectrum to select the pump type. The work areas of the centrifugal pump, axial flow pump, mixed flow pump, and slurry pump are all drawn on the same picture. This constitutes the agricultural water pump series comprehensive spectrum. Drawing is more complicated, but it is more convenient to use.


According to the determined design flow and design head, on the type spectrum, first find the several water pumps that meet the requirements of the head with the design head on the ordinate, and the flow is not equal, and then use the design flow on the abscissa to determine the selection Which kind of water pump. If the design flow is large, the single pump fails to meet the requirements, you can consider multi-machine operation, but you should pay attention to use the same type of pump as much as possible to facilitate construction installation, management and maintenance. Water pump series: diaphragm pump magnetic pump sewage pump centrifugal pump screw pump oil pump refueling pump gear pump oil barrel pump hand pump vortex pump multi-stage pump chemical pump clean water pump stainless steel pump glass fiber reinforced plastic pump plastic pump reciprocating pump submersible pump deep well pump small pump submersible pump Self-priming pump metering pump high temperature pump mechanically sealed vacuum pump series: rotary vane vacuum pump water ring vacuum pump.


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