Slurry impeller technical requirements

Slurry impeller technical requirements

Check the shaft end face runout A on the purpose of the journal is to prevent the accumulation of errors , when fitted to a small beating excessive, affect product quality . A measure other face to face parallel to the reference plane , but not the other side facing the journal of the measuring face runout , the reason is sometimes required for the measurement method , sometimes in order to better reflect the processing quality.

Runout and parallelism are not recommended in Table 10-8 deviation of the shape and position , level precision selection. Keyway centerline axis line for skew refers to the centerline of the keyway at an angle to the shaft axis . Skew too impeller not loaded up , especially multi -stage pump assembly more difficult.

Therefore, more stringent requirements for skew , usually 100 mm long keyway skew tolerance 0.03 mm . Keyway offset is moved in parallel with the axis line . Less impact on the assembly , the tolerance is large, the general tolerance of 0.06 mm groove offset . In order to keep the center hole is a hole in order to overhaul the basis of the centering . Ultrasonic testing of the shaft and the magnetic detection purpose is to check whether there is defective within the shaft , the shaft to ensure reliability of operation . Centrifugal pump impeller is the main parts.

Performance and impeller centrifugal pump design and manufacturing ( casting and machining ) is closely related to the quality . Impeller construction drawings and technical requirements shown in Figure 10-2 , slurry pump manufacturer Technical requirements of the impeller first, second, three potential technical requirements and similar shaft , see the shaft section.

Runout tolerances recommended in Table 10-7 shape and position deviation VII level precision selection, face runout tolerances recommended in Table 10-8 Section VI VII geometric deviation level precision selection . Although the symmetrical shape of the impeller , but in the process of casting and machining error is always there, which is one of the reasons centrifugal vibration occurs . So you have to be statically balanced impeller processed to eliminate unbalanced weight .

General centrifugal pump impeller static balance tolerances recommended in Table 10-9 selection. Impeller static balance test, the front cover with the cut method to eliminate imbalances , the cutting plate thickness shall not exceed 1/3 . From the front , rear panel cut away excess metal , but the cutting part should be connected with a smooth disc . Impeller fifth technical requirements, often easily overlooked. In the production practice due to sand except gill is not complete, but that affect product performance are common phenomena , but also by the performance test mainly the repair , spending a lot of hours , so the impeller must be carefully sand except gill .