PURIFIER POWER TRANSMISSIONS
- Drive electrical motor power is not directly transmitted to the purifier shaft. It is actually transmitted by means of friction clutch arrangement. The motor shaft is equipped with a friction boss. Outside of the friction boss is equipped with a friction block.
- The friction boss along with the friction block is equipped inside a friction pulley which is directly connected to the horizontal shaft.
- The center portions of the friction block are inserted into slots of the friction boss and are free to slide outward.
- As the motor rotates the friction block lining under the action of centrifugal force is pressed against the inside of the friction pulley.
- Slip occurs between the friction pulley and lining and driving force is transmitted to the friction pulley.
- Thus although the motor after startup attains its rated speed instantly, the friction pulley and hence the horizontal shaft speed increases slowly.
- This arrangement prevents the overloading of the motor.
- The horizontal shaft is fitted with a worm wheel will which has a spiral gear on its outer periphery. This spiral gear turns the pinion of the vertical shaft and rotates.
Bowl spindle
In addition to its primary role in the power transmission system, the bowl spindle also serves as:
- pump for the closing water
- supply pipe for the closing water
- lubricator for spindle ball bearings.
Closing water is pumped through the hollow spindle (B) to the discharge mechanism in the bowl. For this purpose, a pump sleeve (b4) is fitted in the lower end.
The two spindle bearings are lubricated with oil mist. An oil pump (b3) creates the oil mist, which is sucked through the upper ball bearing by a fan (b1). Oil is supplied via an oil filling device, which also serves as a level indicator.
Two identical ring-shaped rubber buffers (b2) support the top bearing housing. The buffers are held in place by a buffer holder and form channels through which the recirculated oil passes.
Belt drive
The bowl spindle is driven by a flat
belt. Adaptation to 50 or 60 Hz power supply is made by selecting the motor
belt pulley with the appropriate diameter. A longer belt is needed for the
pulley for 50 Hz.
Correct tension is set by means of a
spring-loaded belt tightener.
Friction coupling
The friction coupling on the motor
pulley ensures gentle start-up and prevents overload of the electric motor.
Centrifugal force creates a torque that acts on the pulley through the friction
elements.
SENSORS AND INDICATORS
Sight glass
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The sight glass shows the oil level
in the oil sump.
Vibration switch (option)
The vibration switch, properly
adjusted, trips on a relative increase in vibration.
The vibration switch is sensitive to
vibration in a direction perpendicular to its base. It contains a vibration
detecting mechanism that actuates a snap-action switch when the selected level of
vibration is exceeded. After the switch has tripped it must be reset manually
by pressing the button on the switch.
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