Pumps – One fluid pumped by contact or entrainment with another – Diverse pumps
Patent
1999-03-25
2000-09-26
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Diverse pumps
123509, 123514, F04B 2308
Patent
active
061235113
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to apparatus for drawing off fuel for motor vehicle tanks.
More precisely, the present invention relates to apparatus for drawing off fuel and that comprises:
a secondary reserve suitable for being placed in a main tank;
main pumping means suitable for drawing fuel from the reserve; and
auxiliary pumping means of the jet pump type suitable for drawing fuel from the main tank and for transferring it to the secondary reserve.
2. Prior Art
Numerous items of apparatus of the above-mentioned type have been proposed for drawing off fuel.
An object of the present invention is to improve known drawing-off apparatus.
SUMMARY OF THE INVENTION
The present invention achieves this object by means of drawing-off apparatus of the type defined in claim 1, which is defined in the form of a preamble and of a characterizing portion relative to document WO-A-93/25403, and comprises apparatus for drawing off fuel for a motor vehicle tank, the apparatus being of the type comprising:
a secondary reserve (20) suitable for being placed in a main take (10);
main pumping means (30) suitable for drawing fuel from the reserve (20); and
auxiliary pumping means (40) of the jet pump type suitable for drawing fuel from the main tank and for transferring it to the secondary reserve (20), the body (41) of the jet pump (40) being angularly positioned to be vertical, with its outlet facing upwards;
said apparatus being characterized by the fact that it further comprises a deflector (60) placed facing the outlet (47) of the jet pump (40) so as to return the fuel coming from the nozzle of the jet pump (40) to the inside of the venturi thereof, so as to facilitate priming the jet pump, when the flow injected into the jet pump (40) is at a rate lower than a threshold, the deflector (60) being provided with a substantially hemispherical cavity (61) that is coaxial with the outlet (47) of the jet pump and that is concave facing said outlet.
The present invention also provides tanks equipped with such drawing-off apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention, together with the objects and advantages thereof, may best be understood by reference to the following detailed description given with reference to the accompanying drawings which are given by way of non-limiting example, and in which:
FIG. 1 is a diagrammatic vertical section view of apparatus of the present invention;
FIG. 2 is a vertical section view of the deflector and of the outlet of a shaped-jet pump of the present invention, the jet pump having two outlet flow regimes;
FIG. 3 is a vertical section view of the deflector and of the outlet of a shaped-jet pump of the present invention, the jet pump having two outlet flow regimes;
FIG. 4 is a diagrammatic vertical section of a variant embodiment of the deflector of the present invention;
FIG. 5 is a diagrammatic vertical section view of a variant embodiment of the deflector of the present invention;
FIG. 6 is a diagrammatic vertical section view of a variant embodiment of the deflector of the present invention;
FIG. 7 is a diagrammatic vertical section view of a variant embodiment of the deflector of the present invention; and
FIG. 8 is a diagrammatic vertical section view of a variant embodiment of the deflector of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows fuel-drawing-off apparatus placed in a main tank 10, and comprising a secondary reserve 20, main pumping means 30, and auxiliary pumping means 40.
The tank 10 is shown in fragmentary manner only in FIG. 1. More precisely, FIG. 1 shows the top wall 12 and the bottom wall 14 of the tank 10 in fragmentary manner. In practice, numerous configurations are possible for the tank 10.
The secondary reserve 20 is formed by a bowl disposed in the main tank 10 in the vicinity of the bottom 14 thereof, and supported in the main tank 10 by any suitable means. Optionally, the bowl 20 may be open at its top end. However, in the particular embodiment shown in FIG. 1,
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Evora Robert Z.
Freay Charles G.
Marwal Systems
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