Companies that upgrade
their pumping systems, or companies that install new systems, with the objective of
improving efficiency commit themselves to substantial investment - not only in
terms of the pumps themselves but also with new energy-efficient motors to
drive them. However; there is no denying that achieving the optimum pump/motor
interface would not be a problem if driving and driven shafts were perfectly
aligned. Interface would not be a problem if machines did not vibrate, and if
shafts never actually moved.
This is why flexible couplings are required.
Typically the coupling is essentially a type of coupling that can connect
aligned shafts or flex to accommodate shafts that are slightly misaligned.
Over-sizing a flexible coupling can result in a reduction in
required flexibility or misalignment compensation. On the other hand, the flexible
Vulkan coupling ez spares that are too large can put
additional stresses on the pumps and motors being coupled.
With these pitfalls in mind, the pump user is equipped to
undertake a selection procedure that essentially depends upon four basic
conditions of shaft misalignment, or movement. These conditions include
parallel misalignment, angular misalignment, end float and the
torsional flexibility. As a matter of fact; to be considered flexible, a
coupling must handle parallel and angular misalignment.
Couplings with four-way flexibility need to accommodate both
end-float and torsional movement.
It goes without saying that Shaft misalignment and rotor
unbalance are major concerns in rotating machinery. It is also to be mentioned
that the system response depends heavily on the relation between the system
natural frequencies and the motor rotational speed. The matter of fact is the
vibrations induced by misalignment are amplified into major vibration sources.
There is hardly any denying, the purpose
of a flexible coupling is essentially to absorb the shaft restoring loads while
maintaining some amount of rigidity in rotation and transmission of torque.
You
should also bear in mind that the wide range of torsionally flexible couplings,
can in fact compensate for relatively large shaft misalignments, while zero
backlash couplings, which offer a greater degree of precision in their
rotation, often come at a compromise to flexibility.
Industry specifications on flexible Vulkan coupling ez spares are
however limited to features such as bores/keyways and fits, balance,
lubrication, and parameters for ratings.
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