4 Description of the Pump (Set)
23 of 98
UPA / UPA S
3400.86/17-EN
or
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Interior (buried) permanent magnet synchronous motor (IPMSM)
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Motor shaft
7)
protected by sealed sleeve coupling
Shaft seal
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Mechanical seal
Bearings
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Radial plain bearings
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Pump bearings lubricated by fluid handled; motor bearings lubricated by water
fill
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Axial thrust is balanced by a tilting-pad thrust bearing in the motor (lower end)
4.7 Configuration and function
6/7
4
5
3
2
1
Fig. 5:
Sectional drawing, example of a UPA 200
Design
Pump and motor are connected by a rigid coupling. The stage casings are connected
by means of studs. A suction strainer at the suction casing protects the pump from
coarse particles in the fluid. The pump set is connected to the piping via a lift check
valve or connection branch with either internal thread or flanged end (optional).
Function
The fluid flows along the motor and enters the suction casing (2) through the suction
strainer (1). It is accelerated outward by the suction stage impeller (3). In the flow
passage of the stage casing (4) the kinetic energy of the fluid is converted into
pressure energy, and the fluid is routed to the next impeller (5). This process is
repeated in all stages until the fluid has passed the last impeller (5). It is then guided
through the integrated lift check valve (6) to the connection branch (7), where it
leaves the pump. The integrated lift check valve prevents uncontrolled backflow of
the fluid.
7
Only for 14D motor
