Fig.5: Sectional drawing
1 Clearance gap 2 Discharge nozzle
3 Casing cover 4 Drive lantern
5 Motor housing 6 Suction nozzle
7 Impeller 8 Shaft seal
9 Shaft 10 Rolling element bearing
11 Rolling element bearing
Design The pump is designed with a radial fluid inlet (suction nozzle) and a radial outlet
(discharge nozzle) arranged on the same axis. The hydraulic system is rigidly
connected to the motor by a shaft coupling.
Function The fluid enters the pump via the suction nozzle (6) and is accelerated outward by
the rotating impeller (7). In the flow passage of the pump casing the kinetic energy
of the fluid is converted 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 to the suction nozzle. At the rear side of the impeller,
the shaft (9) enters the hydraulic system through the casing cover (3). The shaft
passage through the cover is sealed to atmosphere with a 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 the drive lantern (4).
Sealing The pump is sealed by a standardised mechanical seal.
4.7 Noise characteristics
Table7: Surface sound pressure level L
pA
2)3)
Rated power input
P
N
(kW)
Pump set
1450 rpm 2900 rpm
0.25 53 -
0.37 54 -
0.55 55 -
0.75 56 66
2) Spatial average; as per ISO 3744 and EN 12639; valid for pump operation in the Q/Qopt = 0.80 - 1.1 range and for non-
cavitating operation. If noise levels are to be warranted: Add +3 dB for measuring and constructional tolerance.
3) Increase for 60 Hz operation: 3500 rpm, +3 dB; 1750 rpm +1 dB
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