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Energy Conversion Machine
- Jun 28, 2018 -

The machines used to pump liquids, transport liquids, and increase the pressure of liquids are commonly referred to as pumps. From the energy point of view, the pump is a machine that converts energy. It converts the mechanical energy of the prime mover into the energy of the liquid being transported, which increases the flow rate and pressure of the liquid. Pumps are generally used to pump liquids from low-lying areas and transport them along pipes to higher ground areas. For example, we commonly use the pump to pump water from rivers and ponds to the farmland, and pump water from underground deep wells to the water tower. Since the pressure can be increased after the liquid has passed through the pump, the pump can also be used to pump the liquid out of the lower pressure container and overcome the resistance along the way to the higher pressure container or other desired place, for example, The boiler feed pump pumps water from the low-pressure tank to the feed water in the boiler drum with higher pressure. The pump has a wide range of performance, and the huge pump flow can reach hundreds of thousands of in/h or more; while the micro pump flow rate is below tens of mL/h. Its pressure can be up to 100000 MPa from normal pressure. The temperature of the liquid it transports can be as low as -200°C and as high as 800°C. Pumps have many types of liquids that can deliver water (clean water, sewage, etc.), oils, acids, alkalis, emulsions, suspensions, and liquid metals.

Pumps have developed along with industrial development. In the 19th century, there were relatively complete types and varieties of pumps abroad, and they were widely used. According to statistics, around 1880, general-purpose centrifugal pumps accounted for more than 90% of the total output. Pumps for special purposes such as power plant pumps, chemical pumps, and mine pumps accounted for only about 10% of the total pump output. By 1960, general-purpose pumps accounted for only 45Y002Ea, while special-purpose pumps already accounted for 55% o2Ea.