The single-stage centrifugal pump includes a pump body, a pump cover, an electric motor with an output shaft, a pump shaft, a bearing housing, an impeller, a mechanical seal and a machine gland mounted in the pump body. In the single-stage centrifugal pump, during the operation, the liquid is sucked from the middle of the impeller, and the extension is in the direction perpendicular to the centrifugal force, and an axial force is generated when the liquid in the same direction as the shaft is introduced. The method for balancing the axial force of a single-stage centrifugal pump is as follows:
1. Thrust rolling bearings are used in small single-stage centrifugal pumps to flatten axial forces.
2. Adopting the balance hole method: the liquid flowing out from the impeller outlet is opened on the rear cover of the impeller, and the pressure acting on the suction surface of the impeller is applied to the liquid flowing through the balance hole on the rear cover plate. The pressure is basically equal. To eliminate axial forces due to machining errors, a thrust bearing can be mounted on the pump.
3. Balance pipe method: This method is to return the liquid leaking from the high-pressure side seal ring to the pumping population through an external pipeline. This pipeline is called the balance pipe, and the principle is basically the same as the balance hole method.
4. Double suction impeller: When double suction impeller is used, the pressure p row on both sides of the impeller cover is the same, and the pressure on the suction surface on both sides of the impeller is the same, basically eliminating the axial force. In addition, a stop bearing can be mounted on the pump to overcome axial forces due to machining errors. The axial force of a single-stage centrifugal pump has a direct relationship with the smooth running of the pump.
It determines the magnitude of the thrust clearance. The balance of the axial force is often in a dynamic equilibrium. The balance drum and the balance disc are required to bear the axial direction. Force to make it run smoothly between reasonable turbulence. Therefore, adjusting and positioning the balance plate balance is a key factor in pump operation.
