1. Horn tube:
For small and medium-sized vertical axial flow pump suction chamber. The effect is to lead the water to the impeller with minimal loss. The inlet part of the loudspeaker tube is in a curved shape, and the inlet diameter is about 1.5 times of the impeller diameter. In the large axial flow pump, the suction chamber is mostly made into the form of flow passage.
2. Impeller:
It is the main working parts of axial flow pump, from the wheel hub, the water guide cone, blade and so on.
Impeller is generally composed of 2~6 blade curved blade. Streamline section. The blades of the impeller are twisted and arranged on the wheel hub. According to the possibility of blade adjustment is divided into fixed, semi regulatory and fully adjustable three.
Fixed blade and hub integrally cast blade installation angle is not adjust.
The semi adjustable blade can be installed in a certain position according to the requirements of the use, the installation angle of the blade is different, the performance curve of the pump is also different. Blade adjustment, the general need to stop and remove the impeller, in order to be adjusted, suitable for small and medium axial flow pump.
The adjustable blade is to change the blade through a hydraulic adjusting mechanical installation angle, thus changing its characteristics, to meet the head and flow operation requirements, this regulation applies to large axial flow pump. It can be adjusted without stopping or removing the impeller.
3. The guide vane:
The guide vane device is in the shape of the garden or the shape of the garden. The guide vane and guide vane hub and the pump shell composed of guide vane. The guide vane is the role of the water flowing out of the impeller, the rotary motion into axial movement, and make them become the function of pressure can reach the purpose of improving the efficiency of the pump. Leaf blade generally provided with 6 to 12. The inlet side of the guide vane is generally made to be consistent with the direction of the water outlet of the impeller, so as to avoid the impact loss of the water flow. The guide vane outlet side is often used to take 90 degrees, is to make the water flow into an axial movement. The shape of a cone is to reduce the velocity of the water.
4.The pump shaft and the bearing:
Shaft adopts the high quality carbon steel, it is used for coupling with the drive shaft, and the lower end of the impeller. Medium and small axial flow pump shaft is solid. The pump shaft of the large axial flow pump is hollow, and the blade adjustment mechanism is arranged between the hollow shaft, and the operating oil pipe or the operating rod is arranged in the shaft hole.
Bearing axial flow pump because of its different functions, there are two types, one is the guide bearing, used to bear the rotating parts of the meridional stress, radial positioning function, the other is a thrust bearing, mainly used to bear water on the leaves and downward axial thrust in vertical axial pump. Pump rotating parts weight and maintain the axial position of the rotor, and these thrust to the base of the unit.
Axial flow pump bearing using and maintenance methods and centrifugal pump bearings are similar.
5.The stuffing in the pump shaft penetrates through the outlet pipe of the place, with a packing device. The construction methods and maintenance methods are similar to the packing function of centrifugal pump.
