Hermetically Sealed Type
A Hermetically Sealed Type motor utilizes windings of standard construction and insulation thickness. The windings are encased and Hermetically Sealed within the external shell casing on the outside and an internal tube or liner inside the bore. The Hermetically Sealed enclosure eliminates the possibility of water leakage into the winding. The liquid medium circulates between the rotor and stator liner providing lubrication and cooling to the bearings.
Wet Winding Type
A Wet Winding Type motor is one in which the motor windings are in direct contact with a liquid medium. The medium is clean, clear water. A pressure balancing system prevents the exchange of the motor liquid medium and well water due to thermal expansion and contraction when the motor is operating. The liquid medium fills the inside of the motor and surrounds both the stator windings and the rotor. Completely waterproof insulation is used on the magnet wire used for the stator windings. The liquid medium inside the motor air gap and coils acts as a heat transfer device by circulating through the windings and transferring heat to the external casing. The dissipation of this heat occurs as the well water flows at a required velocity over the external case. As is the case in all submersible type motors, the internal liquid medium is also used for bearing lubrication.
Bell & Gossett can provide several options in pump and motor combinations to meet the exacting conditions of your applications:
· High horsepower, limited well diameters.
· Motor sensing devices.
· Water level indicators.
· Special materials.
· Special voltage motors.
Features and Benefits
- Discharge Pipe – Properly sized for optimum water velocities to insure peak hydraulic performance.
- Discharge Bowl – Several discharge sizes available for NPT or flanged pipe.
- Discharge Bearing – Extra long top protected bronze bearing insures positive shaft alignment and stabilization for extended life.
- Intermediate Bowl – Close grained Class 30 cast iron. Water passage glassed for maximum efficiency and abrasion resistance.
- Impellers – Designed for maximum efficiency with wide range of hydraulic coverage. Precision balanced for smooth operation.
- Upthrust Collar – Designed for an extra margin of safety against possible momentary upthrust occurring at startup.
- Intermediate Bowl Bearings – Reliable long life bronze or rubber bearing.
- Lock Collets – Accurately machined to insure positive locking of pump impeller to the shaft.
- Pump Shaft – 100,00 PSI high tensile stainless steel provides strength and excellent corrosion resistance. Ground and polished for smooth bearing surface.
- Suction Inlet – Contoured for smooth flow entrance. Protected by an over-sized stainless steel strainer to prevent the entrance of damaging solids.
- Suction Adapter – Ductile iron provides for increased strength and positive motor alignment. Open area permits easy access to pump/motor coupling.
- Pump/Motor Coupling – Large stainless steel coupling accurately machined for perfect alignment, balance, and power transmission.