Teikoku USA | Chempump
Instruction Manual HE-10677-P (1018)
3
1. General Information
1.1 General Design and Operation
The Teikoku Type-R (Plan 13-SE) is a combined centrifugal pump
and squirrel cage induction electric motor built together into a
single hermetically-sealed unit. The pump impeller is of the closed
type, and is mounted on one end of the rotor shaft which extends
from the motor section into the pump casing. The rotor is sub-
merged in the liquid being pumped and is, therefore, “canned”
to isolate the motor rotor from contact with the liquid. The stator
winding is also canned to isolate it from the liquid being pumped.
Liquid film journal bearings are submerged in system liquid and
are therefore lubricated by the process liquid.
The Teikoku Type-R (Plan 13-SE) has only one moving compo-
nent, a combined rotor-impeller assembly that is driven by the
induced magnetic field of an induction motor. A portion of the
pumped liquid is allowed to circulate through the rotor cavity to
cool the motor and lubricate the bearings. The stator windings
are protected from contact with the circulating liquid by a corro-
sion resistant, non-magnetic, alloy liner, which completely seals or
cans the stator winding.
Flow paths of the Teikoku Type-R (Plan 13-SE) reverse circulation
pumps are shown in
. The circulating liquid is channeled
into the motor section by holes drilled in the front bearing hous-
ing. A portion of the circulating liquid lubricates the front liquid
film journal bearing and returns to the rear of the impeller. The
remainder of the circulating liquid passes over the rotor, cools
the motor, lubricates the rear liquid film journal bearing and then
exits the rear bearing housing returning to the vapor space of the
suction tank via the reverse circulation line. The Teikoku Type-R
(Plan 13-SE) reverse circulation design avoids the heated circulat-
ing liquid returning directly to the pump suction.
The Teikoku Type-R (Plan 13-SE) offers advanced low probability
true secondary containment as a standard design feature. In the
event of a failure of the primary containment can, the stator as-
sembly in conjunction with the leak proof terminal plate assembly
provides the secondary containment. This design prevents any re-
lease of the process liquid out to the atmosphere.
A standard feature of the Teikoku Type-R (Plan 13-SE) is the pat-
ented Teikoku Rotary Guardian (TRG™). The TRG is an electrical
meter that continuously monitors the condition of the bearings.
For more information on the TRG see
The Teikoku Type-R (Plan 13-SE) sealless pump is a precision built
unit that with proper operation and maintenance will provide
years of trouble-free, leakproof service. The entire unit is mount-
ed on a fabricated steel base cradle. Operation is unaffected by
the mounting or operating position, eliminating the need for any
costly alignment procedures.
Figure 1-1. Reverse Circulation Type-R (Plan 13-SE)
