Page - 18 -
© 2014
SLF 2250/4000
Hydromatic Stinger
Technical Description
Technical Description
Water pump
The pump consists mainly of the pump pressure casing, impellers,
pump shaft, diffusers, and pump shaft sealing.
The water penetrates the impeller via the suction inlet. This
process is called axial feed, since the water flows in the direction
of the central axis.
The water which enters through the suction inlet is then seized by
the impeller (impeller blades); thereby the water is deflected by 90
°
and flung out of the impeller in the direction vertically to the shaft.
This is called radial discharge.
The water delivery depends mainly on the effect of centrifugal
force, therefore this type of pump is called a centrifugal pump.
Between the impeller and the diffuser, there is a small gap and the
diffuser, fixed on the pump casing, is stationary. The gap is
necessary in order to prevent the impeller and diffuser from
touching.
The energy of a streaming liquid is composed of velocity and
pressure forces and the energy of velocity can be transformed into
pressure. The water is discharged from the impeller at high
velocity and this transformation of velocity into pressure takes
place in the diffuser.
The cross sectional area through which the water passes from
entering the diffuser until leaving it, is enlarged gradually. The
velocity decreases while the streaming quantity remains unchanged.
The pipe cross sections are dimensioned as to be large enough that
the proportion of the velocity of the total energy at the pressure
outlet of the pump is so small that it can be ignored in comparison
to the proportion of pressure. Therefore only the suction lift of the
pump (which is the sum of the indications on the manometer and
vacuummeter) is mentioned.
Be certain that the pump is not operated with closed valves for a
long period; a temperature increase results.
Disengage the pump if no water is discharged for a long period!
ATTENTION !
It is strictly prohibited to make any modifications on pump without
approval of ROSENBAUER.
