The pump is developed with the development of industry. In nineteenth Century, there had been a relatively complete type and variety of pumps abroad, and had been widely used. According to statistics, around 1880, the output of centrifugal pumps for general use accounted for more than 90% of the total output, while the special purpose pumps for power plants, such as pumps, chemical pumps and mine pumps accounted for only about 10% of the total pump output. By 1960, the pumps for general use accounted for only 45Y002Ea, while the pumps for special purposes had already accounted for 55%o2Ea.
According to the current development trend, special uses of the pump will be more proportional to the proportion of the general use of the pump. Early in the early twentieth Century, the submersible sewage pump was first developed by the United States to replace the deep well pump. Subsequently, Western European countries have also carried out research and development, and continue to improve and gradually improve. For example, Germany's Rhine brown coal mine, the use of a variety of submersible sewage pump more than 2500, the maximum capacity of up to 1600kW, lift 410m. The submersible sewage pump in China was developed in 1960s. The submersible pump on the job surface has been used for irrigation in the south in the south, and the small and medium capacity submersible pump has been formed in series, and has been put into production in batches. The large capacity and high voltage submersible pump and submersible motor have also come out in succession. The large submersible pump from 500 to 1200kW has been put into operation in the mine. Starch cyclone
The machine commonly used to pump liquid, deliver liquid and increase the pressure of the liquid is known as a pump. From the point of view of energy, pump is a kind of machine that transforms energy. It transforms the mechanical energy of prime mover into the energy of the transported liquid, and increases the flow and pressure of the liquid. The pump is usually used to pump the liquid from the lower ground to the high ground. For example, what we see everyday is pumping water from rivers and ponds to farms and irrigating farmland, and pumping water from underground wells to water towers. The liquid through the pump pressure can be improved, so the role of the pump can be used to draw out the liquid from the container of the lower pressure, and to overcome the resistance to transport along the high pressure container or other places, for example, boiler feedwater pump pumping water from the tank to low pressure boiler drum in high water supply. The performance of a wide range of pumps, pump flow can be big giant hundreds of thousands of in / h; the micro pump flow rate in the tens of mL / h. The pressure can be up to l000MPa above the normal pressure. It conveyed the lowest temperature to 200° and below C, up to 800° and C. There are many kinds of liquid in pump. It can transport water (water, sewage and so on), oil, acid and alkali, emulsion, suspension and liquid metal.
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