Industry new

Introduction and application of pump equipment at home and abroad

Pumps have evolved along with industrial development. In the 19th century, there were already more complete types and varieties of pumps in foreign countries, and they were widely used. According to statistics, in 1880, the output of general-purpose centrifugal pumps accounted for more than 90% of the total output, while special-purpose pumps such as pumps for power plants, 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 accounted for 55% o2Ea.

According to the current development trend, special-purpose pumps will increase in proportion to pumps for general use. As early as the beginning of the 20th 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, the Rhine Brown Coal Mine in Germany uses more than 2,500 submersible sewage pumps with a capacity of up to 1600 kW and a head of 410 m. China's submersible sewage pump was developed in the 1960s. The working surface submersible pump has been used for irrigation of farmland in the south, and the medium and small capacity submersible pumps have been formed into series and put into production in batches. Large-capacity and high-voltage submersible pumps and submersible motors have also been launched, and large-scale submersible pumps of 500 to 1200 kW have been put into operation in the mine.

Machines for pumping liquids, transporting liquids, and increasing the pressure of liquids are commonly referred to as pumps. From an energy point of view, a pump is a machine that converts energy, which converts the mechanical energy of the prime mover into the energy of the liquid being transported, increasing the flow rate and pressure of the liquid. Pumps are typically used to draw liquid from a lower ground and transport it along a pipeline to a higher ground. For example, we often use the pump to pump water from the river and pond to the farmland for irrigation; for example, pump the water from the deep underground well and send it 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 draw the liquid out of the lower pressure vessel and to overcome the resistance along the way to a higher pressure vessel or other desired location, such as The boiler feed water pump draws water from the low pressure water tank to the water supply in the boiler drum with higher pressure. The performance range of the pump is very wide, and the massive pump flow can be as high as several hundred thousand in/h; while the micro pump flow is below several tens of mL/h. The pressure can be as high as l000 MPa or more from atmospheric pressure. It can transport liquids at temperatures as low as ~200 °C and up to 800 °C. There are many kinds of liquids to be pumped, which can transport water (clean water, sewage, etc.), oil, acid and alkali, emulsion, suspension and liquid metal.

PREVIOUS：The 70th China International Medical EquipmenNEXT：Description of the function of the diaphragm