Premium Basket Centrifuge

GENERAL DESCRIPTION
Centrifuge is equipment for separating solids & liquids. This is a faster method of filtration and eminently suitable for elimination of liquid or moisture from slurry & wet agglomorates.

In simple filtration operation, the liquid seeps down through the filter cloth because of gravity. The filter cloth permits the liquids to pass through but prevents powders from passing. After some time the fine particles settle on the filter cloth & effectively “BLIND”, the filter cloth & thereby stopping the progress of filtration.

The above hindrance is eliminated in the case of centrifuging, because of centrifugal action the gravity force on the liquid is very high, more than “400 TIMES” the normal ‘G’ VALUE. This causes very high pressure on the filter cloth and hence the fine particle powder is settled. The liquid is ejected through the space between the particles and reaches the filter cloth from where itis evacuated.

OUTER CASING

the outer casing has a cylindrical shell, bottom conical plate & top cover and it houses a rotating basket. the outlet pipe is fixed in a tangential position in the direction of rotation for easy elimination of discharge liquid from the rotating basket & flowing on the surface of the shell & the conical plate.

BASKET
The basket has a thick rigid plate at the bottom, fixed to a perforated cylinder. The bottom plate does not have any perforation. The perforated cylinder acts as a support to the filter cloth, which is subjected to centrifugal force and holds the wet powder. The basket is dynamically balanced for the elimination of vibration during rotation.

The bearing housing holding the shell is fixed rigidly to the outer casing (under the conical bottom plate). The basket is fixed by a taper lock on the bore and also by a dome nut having a reverse thread. This combination ensures rigid locking of the basket to the main shaft during rotation of the basket.

During starting of rotation, a certain level of vibration is noticed. This vibration of the rotating body is transmitted to the outer shell because of rigid fixing of the bearing housing. Hence, the outer casing is suspended on a spring to isolate the vibration to the foundation. The outer casing is suspended on three springs. Three legs are holding the three springs by suspension bolts, which have spherical heads. This helps in swinging the bolts & avoids vibration affecting the leg, base frame, and foundation.

The main shaft and bearings are critical parts of the equipment and are manufactured with extensive care for ease of assembly, maintenance, and proper running. One of the bearing is a “nu” bearing. The special feature is that suitable holes are drilled, providing passage for greasing the bearing without dismantling the bearing housing. The annular space between the shaft and the bearing housing is filled with grease and acts as reservoir for grease ensuring proper lubrication of the bearings all times.

DRIVE
Main drive of the centrifuge is through electric motor, clutch pulley & V-Belt. Maximum power is required for starting of the rotation of the basket. During running very little power is required. A small amount of power is required only to overcome the turbulence caused by rotation inside the outer casing.

The power is transmitted to the V-belt by clutch pulley which ensures the required high starting torque which does not directly over load the motor. One part of the clutch pulley picks up the speed of motor rpm and other part of clutch pulley slowly picks up the speed.

When the full speed is achieved then there is no acceleration of the basket and hence no additional power is required, on the other side for stopping, a brake is provided to stop the rotation of the basket. This is operated by
hand lever