4.5 Configuration and function
6
7
2
3
4
8
9
10
5
1
Fig. 3: Sectional drawing
1
Suction nozzle
2
Bearing housing
3
Rolling element bearing
4
Volute casing
5
Impeller
6
Clearance gap
7
Shaft
8
Rolling element bearing
9
Shaft seal
10
Discharge nozzle
The pump is designed with a tangential fluid inlet and a tangential fluid outlet. The
hydraulic system runs in its own bearings and is connected to the motor by a shaft
coupling.
The fluid enters the pump tangentially via the suction nozzle (1) and is accelerated
outward by the rotating impeller (5). 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 (10), where it leaves the pump. The clearance gap (6) prevents
any fluid from flowing back from the casing to the suction nozzle. The shaft (7)
enters the hydraulic system through the volute casing (4). The shaft passage through
the sealing housing is sealed to atmosphere with a shaft seal (9). The shaft runs in
rolling element bearings (3 and 8) located in a bearing housing (2) which is
connected to the volute casing (4).
The pump is sealed by a shaft seal (standardised mechanical seal or gland packing).
4.6 Noise characteristics
Table 8: Surface sound pressure level L
pA
3)
depending on the rotational speed
Rated
power
P
N
[kW]
Surface sound pressure level L
pA
3)
Pump
3500 rpm
2900 rpm
1750 rpm
1450 rpm 1160 / 870
rpm
960 / 750
rpm
[dB (A)]
[dB (A)]
[dB (A)]
[dB (A)]
[dB (A)]
[dB (A)]
10
69,5
69,0
67,4
67,0
65,6
64,6
15
70,8
70,3
68,7
68,3
66,9
65,9
20
71,8
71,3
69,7
69,3
67,8
66,8
Design
Function
Sealing
Pump
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. The
values indicated do not apply to operation on a frequency inverter.
4 Description of the Pump (Set)
20 of 94
Omega / Omega V
Summary of Contents for Omega
Page 93: ......
