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OIL PURIFIER [PART-2], STRUCTURE OF PURIFIER BOWL

Marine auxiliary machinery, Oil Purifier, Structure of purifier - Bowl. All the bowl components, bowl body, bowl hood, bowl nut, disc stack, top disc, distributor, pilot valve assembly, main cylinder, light liquid chamber, heavy liquid chamber, impeller, centripetal pump, gravity disc, water supply device, water pressure chamber for opening bowl, water pressure chamber for closing bowl, desludge operation mechanism.



The bowl vessel mainly consists of body, hood and nut.  The bowl incorporates separation chamber  composed of disc and top disc and distributor, which distributes feed liquid from the bowl inlet to the separation chamber uniformly.  There is a main cylinder, which slides vertically by water pressure to discharge sludge separated and  accumulated on the inner wall of bowl during operation.  On the outer periphery of bowl, there are pilot valve assemblies for controlling the main cylinder slide.
Purifier bowl
When feed liquid introduced through the feed liquid inlet through the distributor to the separation chamber, it passes through the gap between discs.  Solids and water are separated and purified oil is continually delivered outside by the centripetal pump (light liquid impeller) located on the top of bowl.  Separated water is continuously discharged outside through the heavy liquid impeller.
Purifier bowl
For purifier operation, the interface for separating light liquid and heavy liquid in the bowl must be held  to within a certain range.  So gravity discs with different inner diameters are used according to the gravity of oil to be treated, thereby changing the interface position.  Select an optimum gravity disc according to "Gravity disc selecting procedure" by using nanogram.  For clarifier operation, it requires no change of gravity discs.
Gravity disc


The water supplying device is provided under the bowl to supply operating water for controlling the  discharge of sludge from the bowl to each water pressure chamber (for opening bowl, for closing bowl).  Operating water for opening bowl is fed from section A in and enters the water pressure chamber for opening bowl. Operating water for closing bowl is fed from section B and enters the water pressure chamber for closing bowl.
Water supplying device
Operating water for closing bowl is intermittently fed for a certain time during the purifying running.  Operating water for closing bowl : Water for pushing up the main cylinder and closing the sludge outlet. Operating water for opening bowl : Water for lowering the main cylinder and discharging sludge.
Water supplying device
Two spiral impellers are built in the bowl top to force out light and heavy liquids from the purifier.  The impeller consists of a disc of a certain thickness provided in its interior with spiral grooves.  It is dipped in oil that rotates together with the bowl.
Centripetal pump



A centrifugal force acting on the pilot valve seals the valve seat and the water pressure chamber for closing bowl is filled with operating water.  The operating water pressure pushes up the main cylinder to seal the main seal ring for purifying operation.  Operating water for closing bowl is intermittently introduced into the bowl closing water pressure chamber for a given period of time during purifier operation.
Purifier desludge mechanism
Operating water for opening bowl is fed for a certain time to the water pressure chamber for opening bowl.  It partly goes out through the drain nozzle.  More operating water for opening bowl is supplied and fills up the water pressure chamber for opening bowl.  As its pressure slides the pilot valve toward the shaft center, the seal of valve seat breaks and operating water for closing bowl flows out from the bowl.
Purifier desludge mechanism
When operating water for closing bowl goes out, there is  no more force of pushing up the main cylinder and is pushed down by the pressure in the bowl.  The seal of main seal ring breaks and sludge is instantly discharged outside the bowl.
Purifier desludge mechanism


After the sludge discharge, operating water for closing bowl is fed to the water pressure chamber for closing bowl and, when it is filled up, the main cylinder is pushed up to seal the main seal ring.
Purifier desludge mechanism
Purifier bowl part list
Purifier bowl part list



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