Teikoku USA | Chempump
Instruction Manual G-Series
7
are of low-silicon grade carbon steel. Laminations and windings
are mounted inside the cylindrical stator band. End bells, welded
to the stator band, close off the ends of the stator assembly. Back
up sleeves are provided to strengthen those areas of the stator
liner not supported by the stator laminations. The stator liner is, in
effect, a cylindrical “can”, placed under the stator bore and welded
to the end bell shrouds to hermetically seal off the windings from
contact with the liquid being pumped. Terminal leads from the
windings are connected to a pressure tight terminal plate isolating
the stator cavity from the customer’s electrical connections in the
Teikoku supplied connection box.
1.3 Rotor Assembly
The rotor assembly is a squirrel cage induction rotor constructed
and machined for use in the G-Series Pump. It consists of a
machined corrosion-resistant shaft, laminated core with aluminum
bars and end rings, two corrosion-resistant end covers, and a
corrosion-resistant can. The shaft is provided with flats or with
an impeller key arrangement at one end, to receive the impeller,
and is threaded at the same end to receive the impeller nut which
retains the impeller, or impellers in the case of two-stage models.
The two rotor end covers are welded to the shaft and also to
the rotor can which surrounds the outside of the rotor, thus
hermetically sealing off the rotor core from contact with the liquid
being pumped.
1.4 Bearings
The bearings for the unit are metal sleeved or sleeveless and have
a molded carbon/graphite insert as standard (other materials are
furnished depending on the application), and are machined with
a special helix groove through the bore to assure adequate fluid
circulation at the journal area. Each bearing is manufactured to
close tolerances for a high degree of concentricity, and is held in
a bearing housing by a retaining screw and lock washer. Bearings
are easily replaced by removing the retaining screw and sliding
the bearing from its housing. See
Figure 1-3
. Single- stage models
may be provided with two bearings in the motor end, while two-
stage models may be provided with two bearings in the motor
end plus another bearing (idler bearing) in the pump casing for
additional shaft support.
1.5 Thrust Surfaces
All Teikoku models equipped with thrust surfaces provide a
replaceable bearing surface against which axial loads can be
carried during upset conditions. This arrangement provides two
thrust surfaces between the impeller and rotor assembly. These
surfaces prevent metal to metal contact in the event of abnormal
pump operation such as running dry or cavitation.
A) Single Stage Models GA, GB, & GC. See
Figure 1-4
.
B) Single Stage GVBS. See
Figure 1-5
.
C) Single Stage Models GVD, GVE, and GVHS. See
Figure 1-6
.
Figure 1-3. Bearings – G-Series Sleeved Type
Figure 1-4. Thrust Surfaces, Models GA, GB, & GC
Figure 1-5. Thrust Surface Models GVBS
Figure 1-6. Thrust Surfaces, Models GVD, GVE, & GVHS
