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Fracture causes and preventive measures of impeller hub of slurry pump
Published:
Oct 11,2024
Slurry pump in the process of conveying slurry, often affected by internal conditions frequently occur impeller hub fracture phenomenon. It is necessary to replace the impeller or guard plate for the user during maintenance, which will cause economic loss to a certain extent. This article will analyze the causes of the impeller hub fracture, and give the corresponding preventive measures to reduce the loss in production.
Slurry pump in the process of conveying slurry, often affected by internal conditions frequently occur impeller hub fracture phenomenon. It is necessary to replace the impeller or guard plate for the user during maintenance, which will cause economic loss to a certain extent. This article will analyze the causes of the impeller hub fracture, and give the corresponding preventive measures to reduce the loss in production.
cause analysis
The size of the slurry pump volute is determined by the flow parameters.
Under normal operation of the pump, the impeller circumferencesurrounded by liquid inPressure and velocity are evenly distributed in the pressurized water chamber,
The main shaft of the pump body is symmetrical before and after, so the axial and radial forces are also symmetrically distributed, and the resultant force acting on the impeller is zero,
Ideally, there is no force (in actual production, the rotating impeller has a variety of factors of radial force).
As time goes by, when the coordination relationship between the impeller and the volute is destroyed,
Then the external pressure will change along the axial direction and gradually move to the place where the pressure is small,
As a result, the gap between the impeller and the volute is changed, which is easy to produce friction between the impeller and the guard plate, and the fault occurs.
When the radial force of the spindle is unevenly distributed, the spindle will produce directional deflection under the action of various strain forces,
The impeller and the rear guard plate are forced to deviate in position, resulting in contact and friction between the two, resulting in the fracture of the impeller hub.
Preventive measures
In order to effectively avoid the occurrence of slurry pump impeller hub fracture phenomenon, should take the following preventive measures:
(1) In terms of technology, the hub insert sleeve method is adopted to prevent the wear of the hub.
The hub part of the rear guard plate is turned by a lathe, the diameter of the enlarged shaft hole is consistent with the outer diameter of the hub, and the hub insert sleeve is machined to ensure that the length of the hub is equal to the length of the extended rear guard plate.
(2) the use of the pump to minimize the number of start and stop;
Effectively control the speed of the impeller to prevent micro-defects and thermal fatigue of the equipment from causing cracks or fractures of the components; prevent the pump from overtemperature and overpressure operation, especially to strictly control the overspeed operation.
(3) training to strengthen the theoretical study of pump operators.
Training on how to start and operate the slurry pump related knowledge, such as when starting the pump should open to remove oxygen return valve, do not have the pump or flow is too small phenomenon, otherwise it will cause cavitation, wear and other failures.
Keyword:
Slurry pump,The use of slurry pump,Maintenance of slurry pump
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