1. Bell
The main effect is to introduce the water flow with the smallest loss. Generally used in line with the streamline of the cast iron pipe, the diameter of about 1.5 times the diameter of the impeller. Large axial flow pumps are not generally used by bell, inlet in-situ cast.
2. Impeller
Usually by the blade, the wheel hub and the water guide cone and so on. The blades are generally 4 to 6 pieces, which are twisted, and are arranged on the wheel hub body. Blade material requirements to be able to resist corrosion, anti cavitation, the general use of high-quality cast iron, large pump more than the use of cast steel manufacturing.
3. Guide vane body
The pressurized water chamber guide vane for axial flow pump, impeller installed in the above, by the guide vane and guide vane hub and casing. The guide vane generally have 6 to 12 pieces, fixed on the guide vane hub and casing, an inverted conical shell. The main function of the guide vane is to change the rotational motion of the water flowing out of the impeller to the axial movement, and the velocity of the flow is gradually reduced. Guide vane body is also provided with a lower guide bearing.
4. Pump shaft and bearing
The pump shaft to transfer torque, with the high quality carbon steel. The pump shaft of the large fully regulated type axial flow pump is often made into a hollow shaft so as to facilitate the installation of blades in the inside. Axial flow pump bearings have two kinds, one is the guide bearing, and the other is the thrust bearing.
5. seal device
The shaft hole of the shaft seal device is arranged on the pump shaft penetrates through the pump shell, used to prevent the pressure water leakage, commonly used seal device for stuffing, its structure and the centrifugal pump stuffing similar, just absolute sealing pipe and a seal ring, pressure water pump can directly into the filler for lubrication and cooling.
6. Water outlet pipe
When the water flow is coming out from the guide vane body, the water outlet pipe is passed through a section of diffuser pipe, and the effect of the bend pipe is to lead the pump body smoothly, and the bend angle of the bent pipe is usually 60.
