1. Pump body: that is, the pump casing, including the suction chamber and the pressure chamber
1). The suction chamber: its effect is to make the liquid evenly into the impeller.
2). The pressure chamber: its effect is to collect the liquid, and put it into the lower impeller or guide discharge tube, at the same time the rate of decline in liquid, so that the kinetic energy to further become the pressure energy. The pressure chamber has two ways of spiral case and spiral case. Volute flow due to make spiral named, liquid along the spiral line activities, follow the flow of road section decreased with the increase of the velocity, the kinetic energy into pressure energy; guide wheel is common in segmented multi-stage pump, in order to make the structure simple compact structure, between the first stage impeller and a secondary impeller energy change for selected guide wheel, liquid along the guide rule of flow to the secondary impeller imports.
2. Impeller
It is the only component of the centrifugal pump to transfer energy to the liquid, the pump after it makes the mechanical energy can become a liquid pressure, so that the pressure of the liquid. The impeller is fixed on the shaft with a key, and the shaft is rotated by the original motive unit, and the energy is transmitted to the liquid through the blade.
According to the liquid flow into the impeller channel classification, can be divided into: single suction impeller (at the side of the impeller has an inlet) and double suction impeller (liquid from both sides of the impeller flow to the impeller in a symmetrical way).
According to the liquid phase on the axis of rotation of the main activities of the classification, the impeller can be divided into: radial impeller, axial flow impeller and mixed flow impeller.
According to the structure of the impeller classification, can be divided into closed impeller, open impeller and semi open impeller. Closed impeller by a plurality of blades and they are on both sides of the wheel cover and the wheel structure, which surrounded by two adjacent blade and round cover, disk space is liquid flow; open impeller, as long as the blade, no wheel cover and the wheel; semi open impeller, only on one side of the blade of a roulette.
3. The axis
It is the first part of the transmission of mechanical energy, the original motivation of the torque through it to the impeller. The pump shaft is main parts of the pump rotor, impeller, shaft, shaft is provided with a balance disc and other parts. Pump shaft on both ends of the bearing support, in the pump for high speed reversal, so the pump shaft to carry capacity, wear and corrosion resistance. The pump shaft are chosen as the material of carbon steel or alloy steel after quenching and tempering.
4. Sealing ring (mouth ring)
Seal ring is installed in the rolling of the impeller and the stop of the pump casing (middle and guide vane assembly) between the sealing equipment. The effect after operation between the two voids, adding pump between the high and low pressure cavity liquid of resistance, reduce leakage.
5. Sleeve
Sleeve is used to maintain the pump shaft, which is not affected by corrosion and wear. When necessary, can replace the sleeve.
6. The seal, pump shaft, and a front and back end cover of the stuffing device referred to as seal
First avoid leakage of liquid in the pump and air into the pump, to get to the sealing and to avoid intake leads to the intent of the pump cavitation.
There are usually three ways: Seal of a skeleton rubber seal, packing seal and mechanical seal.
7. Axial force balance device
