The slurry pump mechanical seal has three degrees of freedom, i.e., axial motion, radial motion, and rotation around the shaft. The main measure to control the three degrees of freedom is to improve the installation accuracy of the mechanical seal. When installing mechanical seals, the flatness of the end face and the perpendicularity of the axis of rotation are important. This is often one of the main causes of leakage of mechanical seals in slurry pumps.
The design of centrifugal slurry pumps, including hydraulic design, structural design and component strength design. The design generally refers to the hydraulic design and structural design of the flow parts of the pump, that is, the design of the impeller and pump body (or the sheath and front and rear guards), which are the key components to improve the performance of the pump.
1. The packing of the slurry pump has a certain plasticity, which can produce a certain radial force and be in close contact with the bearing under the action of compressive force. 2. It has sufficient chemical stability, does not pollute the medium, the packing is not swollen by the medium, the impregnating agent in the packing is not dissolved by the medium, and the packing itself does not corrode the sealing surface. 3. Good self-lubricating performance, wear-resistant, and small friction coefficient. 4. When there is a small amount of eccentricity in the shaft, the packing should have enough floating elasticity. 5. It is easy to make and easy to fill.
There are many types of slurry pump fillers. There are four commonly used types: stranded filler, braided filler, plastic filler, and metal filler. The main materials are graphite textile packing, oil-impregnated asbestos packing, PTFE fiber packing, PTFE impregnated asbestos packing.