1、 Water pump
A water pump is a mechanical device that transports or pressurizes liquids. It transmits the mechanical energy or other external energy of the prime mover to the liquid to increase the energy of the liquid. It is mainly used to transport the liquid, including water, oil, acid-base liquid, emulsion, suspended lotion, liquid metal, etc
2、 Classification of water pumps
In the petroleum and chemical industries, the amount, properties, and pressure of liquids to be transported vary. In order to meet the requirements of these different situations, various pumps have been designed and manufactured, resulting in different classification methods for pumps.
（1） Classified by working principle:
① Vane pump: This is a mechanical device that relies on the high-speed rotating impeller inside the pump to transfer energy to the liquid for liquid transportation. There are various forms of pumps belonging to this type, including centrifugal pumps, mixed flow pumps, axial flow pumps, and vortex pumps.
② Positive displacement pump: It uses the periodic variation of the volume of the pump chamber (pump casing or cylinder) to transport liquid, and its discharge process is intermittent. This type of pump, also known as a positive displacement pump, can be divided into two types: reciprocating pump and rotary pump.
③ Fluid power pump: It relies on the energy of another working fluid to pump or press liquids, that is, to transport liquids by relying on the static pressure or kinetic energy of the fluid.
（2） Classification by conveyed medium:
According to the medium being transported, it can be divided into clean water pumps, oil pumps, mud pumps, sewage pumps, acid pumps, alkali pumps, etc.
（3） Classified by prime mover:
According to the prime mover, it can be divided into electric pumps, pneumatic (steam) pumps, magnetic pumps, hydraulic pumps, manual pumps, etc.
3、 Working performance parameters
① Flow rate: Unit: cubic meters per second (m) ³/ h) Instantaneous flow refers to the amount of fluid flowing through the effective cross-section of a closed pipeline or open channel per unit time, also known as instantaneous flow rate. The volume of fluid flowing through a certain section of pipeline per unit time is called the volumetric flow rate of that cross-section. Abbreviated as traffic, represented by Q.
② Head: The unit is meters (M), and head refers to the height at which the water pump can lift water. It is an important performance parameter of the pump, also known as pressure head. Represented by H.
③ Power: The unit is kilowatt hours (KW), and power refers to the amount of work done by an object in a unit of time. That is, power is a physical quantity that describes the speed of work done. The amount of work is fixed, and the shorter the time, the greater the power value. Represented by the letter N.
④ Voltage: The unit is volts (V), also known as potential difference or potential difference, which is a physical quantity that measures the energy difference generated by a unit charge in an electrostatic field due to different potentials. Common voltage: 220V; 380V; 660V; 1140V. Represented by the letter V.
⑤ Electric control cabinet: also known as control cabinet, divided into three categories: self coupling voltage reduction start; Soft start; Variable frequency start.