Centrifugal pump couplings are commonly known as backrest wheels, usually with diaphragm couplings, pin couplings, claw couplings, etc. Can be used in many pump types, such as: single-stage centrifugal pump, multi-stage pump, split case pump, etc.
Before the centrifugal pump and motor are coupled together, align the coupling and check the direction of rotation of the motor against the steering arrow on the pump.
The flexible coupling requires careful alignment of the shaft line by placing thin gaskets under the feet (housing, driver), and carelessness during alignment will result in damage to the coupling and damage to the water pump and motor bearings.
In special occasions, the installation and calibration of the coupling must be carried out in accordance with the instructions provided by the coupling manufacturer. For example, the specified distances between couplings must be observed, see the installation instructions for couplings in the installation drawing.
Correction of Couplings Without Extended Sections in Centrifugal Pumps
For the standard flexible coupling without extended section, a precise straightedge can be used to lean on the latitude of any point on the outer edge of the coupling to observe the degree of parallelism with the shaft, and use a thick plug gauge to control several corresponding positions. The specified distance between two couplings.
Calibration with a measuring table
If more precise calibration is required (in the case of rotation speed > 3600rPm or extended section), the calibration should be carried out with a dial indicator in the radial and axial directions (see figure), and the maximum end face runout is 0.05mm (in the coupling Diameter), try to achieve less than 0.03mm, the maximum radial runout is 0.1mm (at the diameter of the coupling), try to achieve less than 0.05mm.
higher temperature
At higher operating temperatures (approximately greater than 130°C), the final calibration should be performed under the high temperature conditions when the centrifugal pump is operating. like
If the error is larger than the allowable value given above, find out the reason and eliminate it. In most cases, due to expansion of adjacent pipelines
The expansion produces high forces and moments on the centrifugal pump nozzle.
Centrifugal Pump Coupling Cover
Centrifugal pumps must be installed with the coupling cover installed. Coupling guards must be rechecked immediately after each alignment check for proper installation, firmness and distance from the coupling.
