A pump is a mechanical device that is used to transfer liquids.
The pump body is usually made of steel, cast iron, polymer, brass and aluminum. According to the liquid transfer mechanism, the pumps are divided into two main groups: centrifugal and positive displacement pumps. Centrifugal pumps are mainly used to transfer liquid liquids and positive displacement pumps are used to transfer thick liquids.
Centrifugal pumps
Most of the pumps used in the transfer of water or liquid liquids are of centrifugal type. Some of these pumps include household water pumps, floor pumps, floating pumps, mud pumps, floor pumps, hot oil, package circulators, motor home and air conditioners, pool treatment pumps, jacuzzi jet pumps, anti-acid polymer pumps. There are electric and pneumatic barrel pumps, sewage pumps, etc.
Types of positive displacement pumps
Positive displacement pumps are mainly used to create high pressures or transfer viscous liquids. These pumps are also used in cases where a certain amount of liquid needs to be transferred.
Some positive displacement pumps include diaphragm pumps, dosing pumps (injection pumps), gear pumps. , piston, lobe pumps, mono pumps and screw pumps.
The difference between centrifuge pumps and positive displacement
The pumped liquid in centrifugal pumps first enters the eye of the impeller and then moves radially through the vanes on the pump impeller and enters the pump's helical chamber. The movement of the liquid in the spiral chamber increases the pressure at the pump outlet due to the increase in its cross-section.
Of these pumps, they are mainly used in domestic, industrial and agricultural uses to increase water pressure, suction water from wells, Sewage transfer, water purification, hot or cold water circulation in air conditioning and engine room systems, hot water and oil circulation in heat exchangers, etc. are used.
Pressure increase in positive displacement pumps. It is mainly caused by the rotational movement of the gear and lobe or the reciprocating movement of the piston, plunger and diaphragm. The flow of liquid in positive displacement pumps fluctuates, if the output of centrifugal pumps is uniform.
If the output path is blocked in positive displacement pumps, there is a possibility of damage to the pump and the piping path. . Therefore, it is recommended to use a pressure relief valve at the output of these pumps.