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We introduce two other ways of categorization below.
1. Classification by Driving Method
1.1 Electric Pumps
Electric pumps are the most common driving method, with the motor directly driving the pump shaft to rotate. Motors have the advantages of convenient start-up, stable rotation speed, and a wide power range, which can meet the power requirements of different types and specifications of pumps. Electric pumps are widely used in various fields. As long as there is an electricity supply, electric pumps can be conveniently used. In industrial automation production lines, electric centrifugal pumps can accurately control the flow rate and pressure of liquid transportation and work in accordance with production process requirements.
1.2 Diesel Engine Pumps
Diesel engine pumps use diesel engines as the power source. This driving method is suitable for occasions without electricity supply or with unstable electricity supply, such as field operations and emergency drainage. Diesel engine pumps have the characteristics of independent operation and strong mobility and can be quickly put into use in emergency situations. For example, during flood fighting and disaster relief, sewage pumps and drainage pumps driven by diesel engines can quickly drain accumulated water to ensure the safety of the affected areas.
1.3 Pneumatic Pumps
Pneumatic pumps rely on compressed air as the driving force to drive the pump to work. Pneumatic pumps have the advantages of explosion-proof, corrosion resistance, and the ability to transport high-viscosity liquids. They are suitable for some special working environments, such as places with flammable and explosive gases or liquids in the chemical and pharmaceutical industries. Pneumatic diaphragm pumps are a common type of pneumatic pumps. Through the action of compressed air on the diaphragm, the diaphragm makes reciprocating movements, thus realizing the suction and discharge of liquid.

2. Classification by Number of Impellers

2.1 Single-Stage Pumps
Single-stage pumps have only one impeller and have a relatively simple structure and low cost. They are generally suitable for occasions with low head requirements, such as ordinary industrial circulating water systems and small water supply systems. Single-stage centrifugal pumps are widely used in daily life. For example, household tap water booster pumps and small agricultural irrigation pumps usually adopt single-stage centrifugal pumps.
2.2 Multi-Stage Pumps
Multi-stage pumps are composed of multiple impellers connected in series. The liquid passes through each impeller in turn, and the pressure of the liquid is increased once every time it passes through an impeller, so that a relatively high head can be obtained. Multi-stage pumps are suitable for high-head occasions, such as urban high-rise building water supply, mine drainage, and industrial high-pressure liquid transportation. The structure of multi-stage centrifugal pumps is relatively complex and usually adopts a segmented structure. Each segment is connected by bolts, which is convenient for manufacturing, installation, and maintenance.
There are various classification methods for pumps. Different types of pumps have differences in working principles, structural characteristics, performance parameters, and application scenarios. In practical engineering applications, it is necessary to comprehensively consider various factors such as the nature of the transported liquid, flow rate, head, and working environment according to specific requirements to select an appropriate type of pump to ensure its efficient, stable, and reliable operation and meet the needs of various industrial production and domestic water use.