Centrifugal pump the role of the pump body

The pump body surrounds the rotating impeller and is provided with a liquid inlet and a tangent outlet perpendicular to the impeller. Around the impeller pump body to form a gradually enlarged snail-shaped channel, it is often referred to as volute. The direction in which the impeller rotates in the shell is a direction that gradually expands along the volute-shaped passage (that is, the blade is bent backward in the direction of rotation of the impeller). The closer to the outlet, the larger the amount of liquid accepted in the shell, Channel cross-sectional area must be gradually increased. More importantly, the liquid thrown around the impeller at a high speed gradually decreases its velocity in the passage, so that most of the kinetic energy is converted into static pressure energy, that is, the pressure of the liquid is increased and the pressure of the liquid caused by the excessive flow rate is reduced Internal energy loss. Therefore, the pump casing as a pump housing pool liquid, which in itself is an energy conversion device.