KSB Vitachrom, Installation & Operating Manual

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4 Description of the Pump (Set)
20 of 72
Vitachrom
4.6 Configuration and function
Fig. 5: Vitachrom sectional drawing
1 Clearance gap 2 Discharge nozzle
3 Discharge cover 4 Shaft
5 Motor housing 6 Suction nozzle
7 Impeller 8 Shaft seal
9 Drive lantern 10 Rolling element bearing
11 Rolling element bearing
Design The pump is designed with an axial fluid inlet and a radial outlet. The hydraulic
system is rigidly connected to the motor via a stub shaft.
Function The fluid enters the pump via a suction nozzle (6) and is accelerated outward in a
radial flow by the rotating impeller (7). The flow profile of the pump casing converts
the kinetic energy of the fluid into pressure energy. The fluid is pumped to the
discharge nozzle (2), where it leaves the pump. The clearance gap (1) prevents any
fluid from flowing back from the casing into the inlet. The hydraulic system is closed
with a casing cover (3) at the rear side of the impeller; the shaft (4) enters the casing
via the casing cover (3). The shaft passage through the casing cover is sealed to
atmosphere with a dynamic shaft seal (8). The shaft runs in rolling element bearings
(10 and 11), which are supported by a motor housing (5) linked with the pump casing
and/or casing cover via a drive lantern.
Sealing The pump is sealed by a standardised mechanical seal (option: two mechanical seals
in tandem arrangement).
4.7 Noise characteristics
Table 8: Surface sound pressure level L
pA
3)
Rated power input
P
N
Pump set
1450 rpm
-1
1750 rpm
-1
2900 rpm
-1
3500 rpm
-1
[kW] [dB] [dB] [dB] [dB]
1,5 60 61 67 70
2,2 62 63 69 72
3 64 65 70 73
4 66 67 72 75
3) Spatial average; as per ISO 3744 and EN 12639; valid for pump operation in the Q/Qopt = 0.8 - 1.1 range and for non-
cavitating operation. If noise levels are to be guaranteed, add +3 dB for measuring and constructional tolerance.