Figure 10-35.—Path of contaminated oil through a disc-type purifier bowl (Delaval). at the top to allow the fluid and water to discharge. The bowl of the purifier is connected by a coupling unit to a spindle.  The  spindle  is  suspended  from  a  ball  bearing assembly. The bowl is belt-driven by an electric motor mounted on the frame of the purifier. The lower end of the bowl extends into a flexibly mounted   guide   bushing.   The   assembly   restrains movement of the bottom of the bowl, but it also allows the  bowl  enough  movement  to  center  itself  during operation. Inside the bowl is a device with three flat plates  that  are  equally  spaced  radially.  This  device  is commonly  referred  to  as  the  THREE-WING  DEVICE, or just the three-wing. The three-wing rotates with the bowl and forces the liquid in the bowl to rotate at the same speed as the bowl. The liquid to be centrifuged is fed, under pressure, into the bottom of the bowl through the feed nozzle. After priming the bowl with water, separation is basically the same as it is in the disc-type purifier. Centrifugal  force  causes  clean  fluid  to  assume  the innermost position (lowest specific gravity), and the higher density water and dirt are forced outward towards the  sides  of  the  bowl.  Fluid  and  water  are  discharged from separate openings at the top of the bowl. The location of the fluid-water interface within the bowl is determined by the size of a metal ring called a RING DAM or by the setting of a discharge screw. The ring dam or discharge screw is also located at the top of the bowl. Any solid contamination separated from the liquid remains inside the bowl all around the inner surface. GENERAL NOTES ON PURIFIER OPERATIONS For   maximum   efficiency,   you   should   operate purifiers at the maximum designed speed and rated capacity.   Since   reduction   gear   oils   are   usually contaminated with water condensation, the purifier bowls should be operated as separators and not as clarifiers. When a purifier is operated as a separator, you should prime the bowl with fresh water before any oil is admitted into the purifier. The water seals the bowl and creates an initial equilibrium of liquid layers. If the bowl is not primed, the oil is lost through the water discharge  port. There are many factors that influence the time required  for  purification  and  the  output  of  a  purifier, such as the 1. viscosity of the oil, 10-38


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