Classification of pump selection

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

2. According to the media: clean water pump, sewage (sewage) pump, oil barrel pump, corrosion resistant pump, diaphragm pump, magnetic pump, sewage pump, centrifugal pump, screw pump, etc;

3. From the use and installation methods: diaphragm pump, oil pump, refueling pump, magnetic pump, barrel pump, hand pump, centrifugal pump, multistage pump, etc.

After determining the design flow and design head of the pump station, the relevant technical charts can be used to determine the model and specification of the pump. The method is to use the pump performance specification table to select the pump type. The pump factory has provided this table in the product catalog. The performance of each model in the table has three rows of data. Which row should prevail? Generally, the design flow and design head should be consistent with the values in the middle row of the performance table, Or it is close, but it must fall within the upper and lower lines, because this range is the high efficiency area for pump operation. This type of pump is considered to meet the actual needs, and the pump is selected. Use the pump type selection table to select the pump type. According to the determined design head and design flow, in the type selection table, find out the head value that is consistent with or close to the design head by checking the horizontal head; Then, find out the flow value that is consistent with or close to the design flow in the vertical meter head, intersect with the small square vertically and horizontally, which marks the model of the pump and preliminarily selects the pump type.

However, sometimes both pump types meet the design requirements. At this time, the two pump types can be compared for technical and economic analysis, and then one suitable pump type can be selected. This method of pump selection is simple and fast. The comprehensive type spectrum of pump performance is used to select the pump type, and the working areas of centrifugal pump, axial flow pump, mixed flow pump and slurry pump are all comprehensively drawn on the same diagram, which constitutes the comprehensive type spectrum of agricultural pump series. The drawing of this diagram is relatively complex, but it is convenient to use.

According to the determined design flow and design lift, on the type spectrum diagram, first find out several pumps that meet the lift requirements but have different flows based on the design lift on the ordinate, and then determine which pump is selected based on the design flow on the abscissa. If a single pump fails to meet the requirements when the design flow is large, multiple pumps can be considered, but attention should be paid to the use of pumps of the same model as far as possible to facilitate construction, installation, management and maintenance. Pump series: diaphragm pump, magnetic pump, sewage pump, centrifugal pump, screw pump, oil pump, refueling pump, gear pump, barrel pump, hand pump, vortex pump, multi-stage pump, chemical pump, clean water pump, stainless steel pump, glass fiber reinforced plastic pump, reciprocating pump, submerged pump, small pump, submersible pump, self-priming pump, metering pump, high temperature pump, mechanical seal vacuum pump series: rotary vane vacuum pump, water ring vacuum pump.