5
Bearing bracket
6
Suction nozzle
7
Impeller
8
Shaft seal
9
Rolling element bearing, pump end
10 Rolling element bearing, motor
end
The pump is designed with an axial fluid inlet and a radial outlet. The hydraulic
system runs in its own bearings and is connected to the motor by a shaft coupling.
The fluid enters the pump axially via a suction nozzle (6) and is accelerated outward
in a cylindrical 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. At the rear side of the
impeller, the shaft (4) enters the casing via the casing cover (3). The shaft passage
through the cover is sealed towards the atmosphere by a shaft seal (8). The shaft runs
in rolling element bearings (9 and 10), which are supported by a bearing bracket (5)
linked with the pump casing and/or casing cover.
The pump is sealed by a shaft seal.
Standardised mechanical seal or packed gland
4.6
Noise characteristics
Table 6: Sound pressure level measured at surfaces L
pA
2) 3)
Rated power
input
P
N
[kW]
Pump
Pump set
1450 rpm
[dB]
2900 rpm
[dB]
1450 rpm
[dB]
2900 rpm
[dB]
0.55
47
48
55
64
0.75
48
50
56
66
1.1
50
52
57
66
1.5
52
54
58
67
2.2
54
56
59
67
3
55
57
60
68
4
57
59
61
68
5.5
59
61
62
70
7.5
60
62
64
71
11
62
64
65
73
15
64
66
67
74
18.5
65
67
68
75
22
66
68
69
76
30
67
70
70
77
37
68
71
71
78
45
69
72
73
78
55
70
73
74
79
75
72
75
75
80
90
73
76
76
81
110
74
77
77
81
4.7
Scope of supply
Depending on the model, the following items are included in the scope of supply:
▪
Pump
▪
Surface-cooled IEC three-phase current squirrel-cage motor
▪
Flexible coupling with or without spacer
Design
Function
Sealing
Drive
Shaft coupling
2)
Spatial average to ISO 3744 and EN 12639. Applies to non-cavitating pump operation in the range Q/Qopt = 0.8 - 1.1. If
noise levels are to be guaranteed: Add +3 dB for measuring and constructional tolerance.
3)
Increase for 60 Hz operation: 3500 rpm, +3 dB; 1750 rpm +1 dB
4 Description of the Pump (Set)
Etanorm
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