Fluid handling – Systems – Closed circulating system
Patent
1995-08-14
1998-07-28
Chambers, A. Michael
Fluid handling
Systems
Closed circulating system
12317911, 137140, 137150, F16L 4300, F02H 1700
Patent
active
057850852
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a feeding system for liquid fuel.
More specifically, the invention relates to a liquid fuel feeding system of the type comprising a flexible tube extending from a reservoir to a burner system for differential pressure feeding of the fuel.
BACKGROUND OF THE INVENTION
From the prior art in this field, there may be mentioned one-tube systems between a fuel tank and a burner system, wherein the feed tube is provided with an air vent screw and, in general, manually operated pump means.
When such a system is started and before it runs on its own, the air vent screw is opened in connection with the start of the pump means in order to expel the air from the feed tube, thus preventing that air pockets in the feed tube will reduce the differential pressure and result in a lack of or insufficient flow of fuel therethrough.
Feeding systems of the type outlined above and employed in prior art up till now have proved problematic in use, particularly in connection with systems developed for military field operations, where it is difficult to expel the air pockets adequately when the feed tube must lie in loops at various levels, and where poor light often increases the difficulties.
SUMMARY OF THE INVENTION
The present invention aims at improving the state of the art with respect to feeding fuel from a reservoir to a burner system, and it thus relates to a closed feeding system for liquid fuel comprising a flexible tube provided with pump means and extending from a reservoir to a burner system for differential feeding of fuel, and this feeding system is characterized by further comprising a second, flexible tube, running parallel to the first one, for return of fuel to the reservoir, the feed tube upstream and downstream of the pump being provided with non-return valves for flowing toward the strainer housing and the return tube optionally being provided with a non-return valve for flowing toward the reservoir.
The following description and the drawing accompanying it are based on an embodiment wherein the two non-return valves mounted in the feed tube are placed immediately upstream and downstream of the pump means, whereas the non-return valve of the return tube is immediately downstream of the strainer housing of the burner system, this also being the preferred embodiment of the invention.
In a closed feeling system as described above, three substantial advantages are obtained: system is to be moved.
The invention is to be further explained with reference to the enclosed drawing.
DETAILED DESCRIPTION OF THE INVENTION & DRAWING
After the two lines, the feed line 1 and the return line 2 on one side are connected to the fuel reservoir 7 and the strainer housing 8 in a burner system (not shown), the pump, here shown as a manual "squeeze pump," is used to draw fuel from the reservoir 7 to the strainer housing 8.
According to the invention, the feed line in the upstream pump 3 is provided with a non-return valve 4' and the downstream pump 3 with a non-return valve 5'.
These valves are necessary for the function of the "squeeze pump."
In order to eliminate the above suggested problems of the starting phase, i.e., the use of an air vent screw on the burner side with the pertaining danger of overflow and spill, the present feeding system is, as mentioned above, provided with a return tube 2 extending, in principle, parallel to the feed tube 1 and preferably secured thereto.
The return tube is in its inlet end 6 at the strainer housing 8 provided with a non-return valve 6'. This return tube ensures that fuel that is pumped to the strainer housing may, in a closed system, be passed back to the reservoir 7 without spill in the surroundings.
The non-return valve 6' is a preferred embodiment of the invention, said valve ensuring that the return tube 2 in a ready filled system during operation of the burner will not also work as a siphon feed tube in addition to the actual feed tube 1, this being disadvantageous since, according to yet another preferred embodiment, a
REFERENCES:
patent: 383153 (1888-05-01), Siersdorfer
patent: 1871043 (1932-08-01), Chalmers
patent: 2097492 (1937-02-01), Lang
patent: 3131751 (1964-05-01), Twibell
patent: 3162235 (1964-12-01), Capehart
patent: 3233652 (1966-02-01), Phillips
patent: 3783888 (1974-01-01), Johnson
patent: 4274380 (1981-06-01), de Vulpillieres
Halsnes Odd
Oftedal Tor Audun
Chambers A. Michael
Forsvarets Forskningsinstitutt, Div. for Weapon and Material
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