Fluid handling – Systems – With pump
Patent
1999-10-18
2000-11-07
Chambers, A. Michael
Fluid handling
Systems
With pump
13756516, 137571, 137544, 137563, 123514, B67D 540
Patent
active
061421790
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a feed and filtering system for liquid media such as fuels and it relates especially to a feed and filtering system to be used with lorries, such as trailers, which are driven with diesel oil as well as boats.
PRIOR ART
Certain demands, which can be very strict, are generally put on liquid media to be used, for example, as fuels or as starting agents for chemical reactions. These media must be free from solid particles which on the one hand can clog injection nozzles and on the other hand can cause deposits in the supply pipes and they must in many cases to the greatest possible extent be free from water. This applies especially to diesel oil for combustion engines. Additionally, it is very important that these media do not contain bacteria which, in the presence of even small amounts of water, propagate and clog pipes valves and injection nozzles. With regard to diesel oil, the sulphur content in these has, for environmental reasons, been removed or decreased. The sulphur is a poison to many bacteria and these will therefore have the opportunity to thrive in the new oils.
Diesel oil and other liquid media have therefore always been filtered to remove various contaminants on the way from the storage tank to the place of consumption. In lorries, for example trailers, such filters are located between the storage tank and the engine and in large boats between the bunker tank in the bottom of the boat and the day tank located higher up and possibly between this and the diesel engine. These filters may be of different kinds but an especially suitable filter is described in the European patent specification 594614.
WO-A-94/11630 describes an arrangement for supplying fuel to combustion engines with different mixing ratios of fuel qualities having a larger and a smaller tank, the smaller tank being arranged within the larger tank. The two tanks contain different fuels which are mixed in the smaller tank.
TECHNICAL PROBLEM
Even if in the known systems the liquid media can be purified in an effective way, today more serious demands are put on their purity. This applies especially to the water content which sometimes may be very large due to the fact that the storage tanks are surrounded by humid atmosphere and are not filled. The water content also promotes the bacteria formation. Since engines run with an ever-increasing engine speed and the pressure of the oil before the injection moment increases from, for example, 300-400 Bar to 1000-1500 Bar higher demands are also made on the purity with regard to solid particles.
THE SOLUTION
According to the present invention, the problems with the known system have been solved by bringing about a feed and filtering system for liquid media, such as fuels, comprising a storage tank, a day tank, a filter for solid agents and possibly water and a pipe system for connecting the different parts, the day tank, which has an appreciably smaller volume than the storage tank, being located within the latter, which is characterized in that a pipe connection being arranged for non-purified medium between the storage tank and the filter and for purified medium between the filter and the day tank and that the day tank is provided with a feeding out pipe for the medium to the place of consumption and recirculation pipe for excess purified medium to the storage tank.
According to the invention, it is suitable that the filter and the pump system thereto have an appreciably higher capacity (5-10 times) than the consumption of medium so that the day tank is always kept filled and the medium flows through the recirculation system.
According to the invention, it is suitable to arrange a bacteria-eliminator in the pipe connection between the storage tank and the filter.
A water sensor may, according to the invention, be arranged in the pipe system for purified medium between the filter and the day tank.
According to the invention it is suitable that a level sensor is arranged in the day tank which at too low medium level therein is arran
REFERENCES:
patent: 2508170 (1950-05-01), Kaufmann
patent: 2860785 (1958-11-01), Gardner
patent: 4506986 (1985-03-01), Freeman
patent: 4723573 (1988-02-01), Burnett
patent: 4869225 (1989-09-01), Nagata et al.
patent: 4911134 (1990-03-01), Olsson
patent: 4928657 (1990-05-01), Asselin
patent: 5642718 (1997-07-01), Nakai et al.
Bjornsson Aegir
Bjornsson Bjorn
Corneliussen Arvid
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