A pump is a machine that transfers energy to the fluid being pumped to increase its energy, thereby achieving the purpose of pumping fluid. (1) The mechanical energy of the prime mover pump is transmitted to the fluid it pumped so that the mechanical energy of the fluid (the potential energy, the pressure energy and the kinetic energy of the fluid) is increased so that the fluid being pumped can overcome the resistance in the pipeline and move from low energy Bit energy and low pressure) liquid source through the pipeline to high-energy (bit energy and high pressure) liquid place. This form is more common. (2) The pump transfers the energy of liquid A to stream B, and as these two streams flow through the pump, the energy of stream A decreases and the energy of stream B increases, mixing the two streams together Out of the pump, to achieve the purpose of pumping fluid B. This pump is called a jet pump. (3) The pump concentrates the energy in a stream into a part of the stream, increasing the energy of this stream so as to achieve the purpose of pumping part of the stream. Such as water hammer pump.
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