4 Description of the Pump (Set)
17 of 72
Sewatec (60 Hz)
4.5 Configuration and function
1
2
3
4
5
6
7
8
9
10
Fig. 2:
Sectional drawing with K impeller
1
Clearance gap
2
Discharge nozzle
3
Discharge cover
4
Shaft
5
Bearing bracket
6
Suction nozzle
7
Impeller
8
Shaft seal
9
Rolling element bearing
10
Rolling element bearing
Design
The pump is designed with an axial fluid inlet and a radial or tangential outlet. The
hydraulic system
runs in its own bearings and is connected to the motor by a shaft
coupling or belt drive.
Function
The fluid enters the pump axially 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 into 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 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.
Sealing
The pump is sealed by two bi-directional mechanical seals in tandem arrangement.
A lubricant chamber in-between the seals ensures cooling and lubrication of the
mechanical seals.
4.6 Noise characteristics
Table 8:
Surface sound pressure level L
pA
2)
Rated power input
P
N
Pump
Pump set
1750 rpm
1160 / 875 rpm
1750 rpm
1160 / 875 rpm
[dB]
[dB]
[dB]
[dB]
2 hp (1,5 kW)
52,0
51,0
56,5
55,0
3 hp (2,2 kW)
53,0
52,0
58,5
57,5
2)
Measured at a distance of 3.28 ft (1 m) from the pump outline
