Grundfos Medium UPM Series Data Booklet page 22

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Rotor can
The drawn stainless-steel rotor holds the ground and
honed upper radial bearing at the top. The rotor can
has a vent and deblocking screw.
Fig. 28 Rotor can
Bearing plate
The bearing plate is made of stainless steel. The
ground and honed inner radial bearing is pressed into
the bearing plate. Thanks to the relatively large
bearing plate surface, the motor heat is effectively
carried away by the pumped medium. The four tiny
laser holes of the bearing plate ensure optimum
venting and minimise the gradual replacement of rotor
liquid with the pumped medium.
Fig. 29 Bearing plate
Thrust bearing
The thrust bearing is fitted to the shaft in a flexible
suspension. In combination with the bearing plate, the
thrust bearing prevents forces from being transmitted
axially to rotor and rotor can.
Fig. 30 Thrust bearing
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Impeller
The composite impeller is of the radial type with curved
blades. The impeller is secured to the shaft with a split
cone. The impeller, shaft with rotor and bearing plate
are assembled in one unit to eliminate possible
misalignment in the bearings.
Fig. 31 Impeller
Pump housing
As standard, the pump housing is available in
electrocoated cast iron with threaded inlet and outlet
ports. The pump housing is of the in-line type. The
stainless-steel neck ring is pressed into the pump
housing to minimise the amount of liquid running from
the outlet side of the impeller to the inlet side.
Fig. 32 Pump housing
Control box
The control box is made of black composite material
with an aluminium heat sink. It contains the PCBs for
internal power supply and communication.
The spacer fitted between stator and control box
decreases the temperature influence of the pumped
medium/motor temperature. The XL versions have an
additional extended heat sink. The height will be
extended by approx. 21 mm.
Fig. 33 Control box for UPML
Medium UPM