The role of the pump
The pump body is composed of a suction chamber and a water pressure chamber. The inlet of the suction chamber and the outlet of the pressurized water chamber are the inlet flange and the outlet flange of the water pump respectively, which are used to connect the water inlet pipe and the water outlet pipe. The suction chamber is generally a tapered short pipe or a straight pipe of equal diameter that gradually shrinks, and its function is to introduce the water flow into the impeller and provide the impeller with the required flow state. The function of the pressurized water chamber is to collect the liquid flowing out of the impeller and guide the liquid flow to the outlet. The shape of the pressurized water chamber is very similar to a snail shell, commonly known as a volute, and the impeller is wrapped in the volute.
The top of the pump body is provided with an exhaust hole (watering hole) for vacuuming or watering. There is a drain hole at the bottom of the casing, which is usually plugged with square head bolts. After shutdown, it is used to empty the water accumulated in the pump body to prevent the parts in the pump from rusting and freezing in winter to damage the pump body. The pump body is made of cast iron or cast steel, and its inner surface is required to be smooth to reduce hydraulic loss.