appliance is stored for months after being wet tested.
Before, during and after the deblocking, the device is tight
and must not release any water.
TM059253
Deblocking device
TM060291
Sectional drawing of deblocking device
Shaft with rotor
The shaft is made of ceramics. To avoid precipitation of
calcium in the radial bearings, the shaft has been plunge-
ground at the journal bearings. It has a through-going hole
to ensure good lubrication and cooling of the upper
bearing. The rotor can does not need to be vented as air
inside the rotor chamber will escape the system through
the through-going hole of the shaft.
The rotor core is either made of bonded neodymium
permanent magnets, or injection-moulded with PPS
bonded hard ferrite magnetic particles. The rotor is
encapsulated in a thin stainless-steel cladding welded to
the end covers. The rotor is fixed on the shaft by a back
iron with a bush. After assembly the whole unit is
balanced.
TM059250
Shaft with rotor
Thrust bearing
The antimony-free carbon thrust bearing is fitted to the
shaft in a flexible EPDM retainer.
In combination with the bearing plate, the thrust bearing
prevents forces from being transmitted axially to rotor and
rotor can.
TM059252
Thrust bearing
Bearing plate
The bearing plate is made of stainless steel. The ground
and honed inner radial and axial ceramic bearing is
pressed into the bearing plate. The axial bearing is lapped
to reduce any friction and the run in period of the pump.
Due to the relatively large bearing plate surface, the motor
heat is effectively carried away by the pumped liquid. Tiny
laser holes through the bearing plate ensure optimum
venting and minimise the gradual replacement of rotor
liquid with the pumped liquid.
TM059249
Bearing plate with ceramic bearing
Impeller
The composite impeller is of the radial type with curved
blades. The impeller shaft with rotor and bearing plate is
assembled in one unit to eliminate possible misalignment
in the bearings.
Three types of impellers are used:
• UPM3 Standard: diameter 38 mm, clearance 3 mm
• UPM3 SOLAR: diameter 52 mm, clearance 2.5 mm
• UPMO: diameter 48 mm, clearance 3 mm
TM059251
Impeller
Moving unit
The unit is a pre-mounted combination of the shaft with a
rotor, thrust bearing with a retainer, bearing plate and
impeller. The moving unit is inserted into the rotor can with
the upper radial bearing. The unit runs as a bearing
system, ceramic/ceramic, with almost no wear as long as
it is lubricated. During production, the unit is lubricated
with glycerine. When the unit is mounted in a water-filled
system, the system water lubricates the bearings. This
guarantees the extremely reliable Grundfos ceramic
bearing system of wet-running pumps.
UPM3
9
37
Technical description
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