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Classification and function of pump

Data: 2020-12-25

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Classification and function of pump
A pump is a fluid machine that uses external energy to transport liquid. The medium conveyed by the pump is generally liquid, such as water and oil.

Positive displacement pump

The working principle of the positive displacement pump is to transfer energy to the fluid through the periodic change of the volume of the working chamber.


Positive displacement pump


When the positive displacement pump is running, the working volume inside the machine is constantly changing, thereby sucking or discharging fluid. According to its structure, it can be further divided into:
1. Reciprocating
This kind of machinery uses the reciprocating action of the piston in the cylinder to repeatedly change the internal volume of the cylinder to suck and discharge fluid, such as a piston pump;
2. Rotary
When the rotor or rotating parts in the casing rotate, the working volume between the rotor and the casing changes, so as to suck and discharge fluid, such as gear pumps and screw pumps.

Centrifugal pump

The centrifugal pump is composed of impeller, extruding chamber, suction chamber, diffuser tube and other components.
FSB-L centrifugal pump from Paragon
Centrifugal pumps are the most widely used. Most of the pumps in thermal power plants use centrifugal pumps. Centrifugal pumps are usually classified according to the following three structural characteristics: according to the number of working impellers, they are divided into single-stage pumps and multi-stage pumps; according to the way the impeller sucks liquid into single-suction pumps and double-suction pumps; according to the direction of the pump shaft Horizontal pump and vertical pump.

Axial flow pump

The axial flow pump is mainly composed of an impeller, a suction port, and an outlet diffuser tube. Axial flow pumps are suitable for occasions with large flow and low head.


Axial flow pump
The difference between centrifugal pump and axial flow pump start:

Centrifugal pumps should be started with no load (closed door), while axial pumps should be started with load;
Because when the specific speed is low, the minimum power occurs in the idling state. To protect the motor, the centrifugal pump should be started when the outlet valve is closed.
The maximum power of the axial flow pump appears in the idling state, so the axial flow pump should open the valve to start, that is, start with load.

The above information is compiled by Paragon. If you want to buy a centrifugal pump, please click here for details.