Flow pump for feeding fuel from a supply container to internal c

Details Flow pump for feeding fuel from a supply container to internal c Flow pump for feeding fuel from a supply container to internal c

1996-08-21

1998-09-15

Verdier, Christopher

Rotary kinetic fluid motors or pumps

With means for re-entry of working fluid to blade set

Turbine regenerative pump

F04D 500

Patent

active

058070680

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on a flow pump for feeding fuel from a supply container to the internal combustion engine of a motor vehicle.
One such flow pump is known from German Patent Disclosure DE 33 27 922 A1. This flow pump has an impeller, which has one ring of circumferentially spaced-apart vanes on each of its two axially pointing face ends, with interstices between the vanes. The vanes cooperate with an annular feed conduit for feeding fuel. The vanes are embodied as flat, and when the impeller is viewed radially to its rotary axis, the vanes extend parallel to the rotary axis of the impeller. Between the vanes and the feed conduit, a circulation flow develops, by which the energy transport from the impeller to the flow takes place. The fuel enters the interstices in the region of the radially inner ends of the vanes and emerges again from the interstices in the region of the radially outer ends. The flow undergoes a change of twist between the inlet and the outlet, and as a result a pressure increase is brought about in the annular feed conduit. When the impeller is embodied with vanes that are perpendicular to the face end, unfavorable flow conditions prevail, especially on the inflow and outflow of the pumped fuel into the spaces between the vanes or from the vanes, so that neither the feed pressure attainable with the known flow pump or its efficiency is optimal.


SUMMARY OF THE INVENTION

The flow pump of the invention has the advantage over the prior art that the attainable feed pressure and efficiency are increased. This can be ascribed to the improved flow conditions, resulting from the arrangement of the vanes in which they lead ahead in the circumferential direction of the impeller, on the face end of the impeller, since as a result of these improved conditions an inflow of the pumped fuel into the interstices that is approximately parallel to the vanes is attained. As a result, a breakaway or separation of the flow, on the back side of the vanes pointing counter to the circumferential direction of the impeller, along with the attendant turbulence, are prevented. And as a result in turn impact losses in the flow are avoided and an increase in the circulation flow, which is responsible for the energy transport between the vanes of the impeller and the feed conduit, is attained.


BRIEF DESCRIPTION OF THE DRAWINGS

A plurality of exemplary embodiments of the invention are shown in the drawings and described in the ensuing description.
FIG. 1 shows a partial sectional views a flow pump for feeding fuel from a supply container to the internal combustion engine of a motor vehicle, in a simplified illustration;
FIG. 2, in an enlarged view and in section, shows a detail marked II in FIG. 1 of the flow pump in a first exemplary embodiment;
FIG. 3 shows the impeller of the flow pump of FIG. 2 in a cross section perpendicular to its rotary axis;
FIG. 4 shows the impeller of the flow pump in a section taken along the line IV--IV of FIG. 3;
FIG. 5 shows a sectional view of the detail marked II in FIG. 1 of the flow pump in a second exemplary embodiment;
FIG. 6 shows the impeller of the flow pump of FIG. 5 in a cross section perpendicular to its rotary axis;
FIG. 7 shows the impeller of the flow pump in a section taken along the line VII--VII of FIG. 6;
FIG. 8 shows the impeller of the flow pump in a third exemplary embodiment, in a side view in the direction of its rotary axis;
FIG. 9 shows the impeller in a section taken along the line IX--IX of FIG. 8;
FIG. 10 shows a modified embodiment of the impeller of FIG. 8;
FIG. 11 shows the impeller of the flow pump in a fourth exemplary embodiment, in a side view in the direction of its rotary axis; and
FIG. 12 shows the impeller in a section taken along the line XII--XII of FIG. 11.


DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

FIG. 1, in a simplified illustration, shows an assembly 10, which in a common housing 12 includes a flow pump 14 and a drive motor 15 for the flow pump 14. The assembly 10 is disposed in a fuel supply contain

REFERENCES:
patent: 1689579 (1928-10-01), Burks
patent: 1973669 (1934-09-01), Spoor
patent: 2042499 (1936-06-01), Brady
patent: 3095820 (1963-07-01), Sanborn et al.
patent: 3917431 (1975-11-01), Rose
patent: 3951567 (1976-04-01), Rohs
patent: 4653979 (1987-03-01), Schillinger
patent: 5265996 (1993-11-01), Westhoff et al.

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