The main parts of mortar pump include impeller, pump shell and shaft seal device. 1 impeller The open impeller has no cover plate on both sides of the blade, which is suitable for conveying materials containing a large amount of suspended solids, with low efficiency and rarely used. The semi closed impeller has no cover plate on one side of the suction port and a cover plate on the other side, which is suitable for conveying materials easy to precipitate or contain particles, and its efficiency is low; The closed impeller has front and rear cover plates on both sides of the blade, which has high efficiency and is suitable for conveying liquid without impurities. The closed impeller has two ways: single suction and double suction. 2 pump housing The function is to seal the impeller in a certain space, so as to inhale and press out the liquid by the impeller. Pump case made of volute shape, it is also known as volute. As the cross-sectional area of the flow channel is gradually enlarged, the high-speed liquid thrown out from the impeller gradually reduces the flow velocity, so that part of the kinetic energy can be effectively converted into static pressure energy. The pump shell not only collects the liquid thrown out by the impeller, but also is an energy conversion device. 3 shaft sealing device The function is to prevent the liquid in the pump shell from leaking out along the shaft or the external air leaking into the pump shell. There are two kinds of common shaft seal devices: packing seal and mechanical seal. The filler is usually impregnated with oil or coated with graphite asbestos rope. Mechanical seal mainly depends on the relative movement of the end face between the moving ring installed on the shaft and the static ring fixed on the pump shell to achieve the purpose of sealing.Wholesale Pump Parts website:http://www.delin-pump.com/pump-parts/