Pump classification, pump classification

Pump Category: Pumps are machines that convert the mechanical energy of the prime mover into liquid energy. The prime mover (motor, diesel engine, etc.) drives the impeller to rotate through the pump shaft to work on the liquid to increase the energy (including potential energy, pressure energy and kinetic energy) so that the liquid can be transported to a high place or where pressure is required. Pump classification and technical performance in accordance with the principle of the pump can be divided into power pumps, positive displacement pumps and other types of pumps 1. Centrifugal pump basic performance parameters for the flow Q (m3 / h, L / h), head H (m), allowable cavitation margin △ hr (m), speed n Efficiency η. These pumps are simple in construction and light in weight, delivering clear water at temperatures up to 80 ° C and liquids that are physically and chemically similar to water. 2. Axial flow pump axial flow pump is mostly single-stage, can be divided into fixed blade and adjustable blade two. 3. Vortex pump Compared with the centrifugal pump, the same impeller diameter and speed, the vortex pump head 2 to 4 times higher than the centrifugal pump, but its efficiency is low, usually only 20% to 50%. Vortex pump fluid clean, low viscosity, non-solid particles. 4. Reciprocating pump reciprocating pump with electric pump, direct acting pump, diaphragm pump, metering pump four. 5. Screw pump Screw pump is characterized by small fluctuations in flow and pressure, small noise, long life, self-priming capability, simple structure and compact. A single screw pump, twin screw pump and three screw pump points. 6. Gear pump gear pump is simple, easy to manufacture, reliable, easy maintenance, self-priming, but the flow and pressure pulsation and noise larger. Gear pump is suitable for conveying a variety of liquids without solid particles, the viscosity of the transport liquid range is very wide, high pressure liquid can be transported. 7. Liquid ring pump liquid ring pump is a fluid conveying fluid machinery. Liquid ring pump working fluid often water, sulfuric acid, oil and so on. Liquid ring vacuum pump commonly used in vacuum evaporation, drying, water pump and so on. Liquid ring compressor is mainly used for pressure delivery of gas, ethylene, chlorine, oxygen and so on. 8. Vacuum Pump There are many types of vacuum pumps, reciprocating with empty pump, rotary vacuum pump, Roots vacuum pump and jet vacuum pump.