Teikoku USA | Chempump
Instruction Manual G-Series
6
1.1 General Design and Operation
The Chempump
TM
Plan 11-S G-Series is a combined centrifugal
pump and squirrel cage induction electric motor designed and
produced as a single hermetically-sealed unit. The pump impeller
is an enclosed type and mounted on one end of the rotor shaft,
which extends from the motor section into the pump impeller
casing.
The rotor is hermetically sealed or “canned” with a corrosion
resistant, nonmagnetic, alloy shell to isolate it from contact with
the pumped liquid being circulated through the liquid cooled
motor assembly. The rotating rotor and shaft assembly and its
supporting thin film liquid lubricated bearings, operate immersed
in the circulating liquid, functioning as both a motor coolant and
bearing lubricant.
The motor stator winding is also canned with a corrosion resistant,
non-magnetic, alloy liner, to simultaneously isolate it from the
same circulating liquid. Chempump
TM
Plan 11-S G-Series pumps
are characterized by the use of an external circulation pipe to
channel and control a portion of pump discharge flow into the
rotor cavity through the rear bearing housing into the rotor cavity
of the motor to effect motor cooling in this liquid cooled motor
design. Through a combination of flow and pressure control
mechanisms designed into the canned motor pump assembly, the
circulating fluid is driven by pump discharge pressure into the rotor
cavity to assure required motor cooling and the establishment of
the bearing liquid film for rotating element support. The flow
path of a Plan 11-S G-Series pump is shown in
Figure 1-1
. The
circulating liquid is channeled from the discharge flange to the
motor section through the circulation pipe. The circulating liquid
first lubricates the rear bearing, then passes over the rotor, cooling
the motor, moves forward to lubricate the front bearing and then
exits the motor section through the front bearing housing. The
fluid returns to the high-pressure region of the impeller for joining
the pump discharge flow.
The discharge filter,
Figure 1-2
, located in the discharge nozzle
of the pump casing, helps to extend motor and bearing life by
keeping the circulating fluid free of damaging particles. Although
this filter is open top and bottom, and is constantly washed by the
discharge flow, certain types of solids are gummy and will adhere
to the fine wire mesh, thus restricting flow to the bearings. If
this type of solid is present, periodic inspection of the filter is
recommended.
The G-Series pump is a precision-built unit that, with proper
care, provides years of trouble-free, leakproof service. This
manual, containing basic instructions for installation, operation
and maintenance of G-Series pumps, is designed to assist you in
maintaining this service.
It is important that the persons responsible for the installation,
operation and maintenance of the pump, read and understand
this manual thoroughly. Trouble-free performance begins with
proper pump selection and application. If the selected pump
does not have the required performance characteristics, or if the
materials of construction are not properly specified for the fluid
being handled, unsatisfactory operation may result.
No amount
of maintenance can compensate for this.
If you doubt the pump selection or application, email or call your
Teikoku application representative or the factory for assistance
and advice. Additional copies of this manual are available from
Teikoku field representatives or from the factory.
1.2 Stator Assembly
The stator assembly consists of a set of three-phase windings
connected in a one circuit wye arrangement. Stator laminations
1. General Information
Figure 1-1. G-Series Schematic Diagram, Plan 11-S Standard Circulation Single Stage
Figure 1-2. Discharge Filter Arrangement
CIRCULATION FILTER
COUNTER BORE
CIRCULATION LINE
DISCHARGE
