What is the function of the impeller of the slurry pump?
As can be seen, in the same performance parameters, the axial force of the slurry pump is larger than the general horizontal pump, but the balance is more difficult than the vertical pump. Therefore, in diving sewage pump, bearing is easy to damage, the reason is also with the axial force has a great relationship. But if the auxiliary impeller is installed, the liquid acts on the auxiliary impeller, and the direction of the pressure difference force is opposite to the resultant force of the two forces, so that a part of the axial force can be counteracted, and the service life of the bearing is prolonged. However, the use of sub impeller seal system also has a drawback, that is, in the secondary impeller to consume part of the energy, generally around 3%, but as long as the design is reasonable, you can minimize this part of the loss to a minimum. In the mud pump in general, power is always increased with increasing flow, that is to say, the power curve is an increase with the rising flow curve, the use of the pump will bring about a problem: when the pump is in operation at the operating point for design, in general, less than the motor rated power power pump the use of this pump is safe; but when the pump head decreases, the flow will increase (from the pump performance curve can be seen), power is also increased. When the flow rate exceeds the design point, the flow rate reaches a certain value, the input power of the pump may exceed the rated power of the motor, causing the motor to be overloaded and burned. Motor overload operation, or protect the system action, so that the pump stops rotating
Or protect the system from causing the motor to burn out. The pump head below the design point lift usage, in practice is often encountered, a situation is when the pump selection, pump head selected too high, but the actual use is to lower the lift pump use; another situation is in use the pump operating point is not too OK, in other words the flow of pump need to be adjusted; there is a need to change the location of pump use. These three cases may cause overloading of the pump and affect the reliability of the pump.
Vice impeller play a role in addition to sealing, but also can reduce the axial force in the mud pump is mainly in the axial force acting on the impeller on the liquid pressure force and the rotating part of the gravity of the composition, the direction of the two force is the same, efforts are made by the sum of two forces a.
