Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1997-02-24
1999-11-09
Verdier, Christopher
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 554, F04D 500
Patent
active
059802006
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a peripheral pump
From German Patent Application DE 40 20 521 A1, a peripheral pump is known that includes a circular-cylindrical impeller revolving in a pump chamber; on at least one of its two end faces, the impeller has a ring of vanes spaced apart from one another in the circumferential direction of the impeller, and viewed in terms of the longitudinal section through the pump, a bottom of the groovelike gap between two adjacent vanes forms a circular segment whose center is virtually identical to the center of another circular segment that is formed by the bottom of an annular feed conduit, which is disposed facing the ring of vanes, each in one wall of the pump chamber. Peripheral pumps of this kind, even after only a relatively short time in operation, show that the impeller is subject to considerable wear, which is due to an axial force that builds up in the peripheral pump, acts on the impeller, and presses the impeller in particular against an intake-side wall of an intake cap. Such a peripheral pump also has poor startup performance. Moreover, the axial force that builds up in the fuel feed unit leads to poor noise abatement.
SUMMARY OF THE INVENTION
The peripheral pump according to the invention has the advantage over the prior art that a pressure force acting on the impeller counter to the axial force can be embodied in the pressure region, so that the total of the axial forces acting on the impeller is virtually zero. As a result, the impeller can rotate freely in the pump chamber, so that virtually wear-free rotation between the impeller and the walls forming the pump chamber is made possible, and hence substantially better noise abatement is attained as well.
Depending on the specific use, the operating pressure prevailing in the pressure region can be determined by varying the angle between a connecting conduit and the intake opening of the feed conduit. As the angle or travel distance increases, a higher pressure builds up in the feed conduit; at the end of the feed conduit at the outlet opening, it may amount to as much as 3 bar, for instance. By the disposition of the connecting conduit at a certain angle between the intake opening and the outlet opening, the pressure shifted to the pressure region and prevailing in it, which acts counter to the axial force acting on the impeller, is adjustable.
An advantageous further feature of the invention is that, according to which a large-diameter pressure face extending radially of a cylindrical segment near the shaft of the impeller is provided on a wall of the pump chamber on the intake side; this pressure face is embodied as large compared with the outlet-side pressure region. As a result it is attainable that when the peripheral pump starts up, a greater force can be built up in the intake-side pressure region than in the outlet-side pressure region, so that the impeller runs on the intermediate housing and as a result a substantial improvement in noise abatement can be attained.
BRIEF OF THE EXEMPLARY EMBODIMENT
One exemplary embodiment of the invention is shown in the drawings and described in further detail in the ensuing description. Shown are:
FIG. 1, a fuel feed unit with a peripheral pump shown in partial longitudinal section;
FIG. 2, a schematic sectional view taken along the line II--II of FIG. 1; and
FIG. 3, a schematic sectional view taken along the line III--III of FIG. 1.
DESCRIPTION OF PREFERRED EMBODIMENTS
A unit 10 shown in FIG. 1 serves to feed fuel from a feed tank, not shown, to an engine, also not shown, of a motor vehicle. The fuel feed unit 10 has a flow pump 11, whose impeller 12 is connected in a manner fixed against relative rotation by a shaft 13 driven by an electric drive motor, not shown. The shaft 13 passes through the impeller 12 and rests on a bearing trunnion 14, which is disposed on an intake cap 16. The intake cap 16 closes off the fuel feed unit 10 on its intake-side end face. The impeller 12 is disposed in a pump chamber 17, which is defined o
REFERENCES:
patent: 4673333 (1987-06-01), Kluge
patent: 4692092 (1987-09-01), Matsuda et al.
patent: 4844621 (1989-07-01), Umemura et al.
Baier Klaus
Rollwage Mathias
Schelhas Peter
Schmieder Dietmas
Robert & Bosch GmbH
Striker Michael J.
Verdier Christopher
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