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Design The pump is designed with an axial fluid inlet and a radial outlet. The hydraulic
Function The fluid enters the pump axially via the suction nozzle (6) and is accelerated
Sealing The pump is sealed by a shaft seal (standardised mechanical seal or gland packing).
Table 5: Surface sound pressure level L
Rated power input P
[kW]
15
18,5
22
3
Surface sound pressure level as per ISO 3744 and DIN EN ISO 20361 ; valid for a pump operating range of Q/
QBEP = 0.8 - 1.1 and non-cavitating operation. If noise levels are to be guaranteed: Add +3 dB for measuring
and constructional tolerance.
16 of 62
4 Description of the Pump (Set)
4.6 Configuration and function
1
2
6
7
Fig. 6: Sectional drawing
1
Clearance gap
3
Casing cover
5
Bearing bracket
7
Impeller
9
Rolling element bearing, pump end
system runs in its own bearings and is connected to the motor by a shaft coupling.
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 (4) enters the casing via 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 (9 and 10), which are supported by a bearing bracket (5)
linked with the pump casing and/or casing cover.
4.7 Noise characteristics
3)
pA
Pump
N
1450 rpm
[dB]
64
65
66
Etanorm FXV
3
4
5
9
8
2
Discharge nozzle
4
Shaft
6
Suction nozzle
8
Shaft seal
10
Rolling element bearing, motor end
2900 rpm
1450 rpm
[dB]
66
67
68
10
Pump set
2900 rpm
[dB]
[dB]
67
74
68
75
69
76
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