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Magnetic Filtration of Fuel Oil
Page 107
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Interesting Features in a New Simms Device for Safeguarding Atomizers
HOW1,11FR careful an operator may be in filtering oil fuel, prior to its passage through the injection pump, there is always the risk that foreign matter, particularly scale from highpressure pipes, may find its way into the actual atomizer nozzles, the holes in which are frequently of almost microscopic dimensions. An atomizer-pipe filter has now been evolved by Simms Motor Units, Ltd., Percy Buildings, Gresse Street, London, W.1, with the object of overcoming these troubles without introducing complicated components.
A cast, two-piece body, about 31 ins. long (including the unions), houses the two filtering media. Fuel enters this body and passes into a circular chamber in which are exposed the ends of four bar magnets. These attract and bold all ferrous impurities. Next the oil passes through a brass plug in which are two annular openings, providing, in each case, a passage of about .002 in.; this line filter prevents the further movement of non-ferrous impurities. After this the liquid goes to the atomizer. One of these units is incorporated in each pipe line leading from the injection pump to the atomizers, as close as possible to the last-named so that there may be the minimum length of possibly scaly pipe through which the fuel has to pass, after filtration.
All the details are substantially made, as they have to withstand the full injec tion pressure. For cleaning purposes the brass line filter and the magnets are readily removable, washing in petrol being all that is required. A spring ring separates the two filtering media so that the magnets do not interfere with the passage of fuel through the apertures, the area of which is sufficient to provide the necessary rate of flow.
Another type of filter is made which has only the magnetic unit ; this is about 3} ins. long.