Equipment for pumping fuel from a storage tank to the internal-c

Details Equipment for pumping fuel from a storage tank to the internal-c Equipment for pumping fuel from a storage tank to the internal-c

1998-01-22

2000-11-28

Look, Edward K.

Rotary kinetic fluid motors or pumps

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

Turbine regenerative pump

415 555, F01D 300

Patent

active

06152686&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a unit in accordance with the species of claim 1 for conveying fuel from a tank to the internal combustion engine of a motor vehicle.
Such a unit is known from DE 40 20 521 A1. This unit has a conveying pump designed in the form of a flow pump, whose impeller wheel, which is rotatingly driven by a drive element, turns in a pump chamber. The pump chamber is delimited in the direction of the axis of rotation of the impeller wheel by two oppositely located front walls, and in the radial direction in relation to the axis of rotation by an annular wall. On both its front faces, the impeller wheel respectively has a crown of vanes. At the two front walls, grooves are arranged around the axis of rotation of the impeller wheel at the height of the vanes respectively extending over a portion of the circumference which, together with the vanes of the impeller wheel, respectively constitute a conveying channel. The conveying channels lead from an inlet opening on their one end to an outlet opening at their other end. The impeller wheel has an outer ring connecting its vanes at their outward extending ends. With this embodiment of the unit it has been shown that, because of convection, the entry of dirt particles into the space between the outer ring of the impeller wheel and the annular walls through axial gaps existing between the front ends of the impeller wheel and the front ends cannot be ruled out. This is caused by a build-up of pressure occurring in the conveying circuits in the direction of rotation of the impeller wheel, so that therefore a higher pressure exists there than in the space between the outer ring of the impeller wheel and the annular wall, becauseof which an amount of leakage flows from the conveying channels into the annular space. Entry of dirt particles into this chamber can lead to increased wear of the unit and should therefore be avoided.


SUMMARY OF THE INVENTION

In contrast thereto, the unit in accordance with the invention for conveying fuel from a reservoir to the internal combustion engine of the motor vehicle has the advantage that a pressure build-up in the direction of rotation of the impeller wheel also takes place through the at least one flow channel in the space between the outer ring of the impeller wheel and the annular wall, and therefore a pressure difference between the at least one flow channel and the conveying channels is prevented or at least reduced, and thus the amount of leakage between the conveying channels and the annular chamber is prevented or at least reduced. Furthermore, the entry of dirt particles into this space is reduced.
Advantageous embodiments and further developments of the unit are recited in the dependent claims. By means of the embodiment it is achieved that a pressure build-up takes place in the at least one flow channel which approximately corresponds to the pressure build-up in the conveying channels. By means of the embodiment in accordance with claim 6 it is possible to affect the pressure build-up in the at least one flow channel.


BRIEF DESCRIPTION OF THE DRAWINGS

Three exemplary embodiments of the invention are represented in the drawings and explained in more detail in the following description. FIG. 1 shows a unit for conveying fuel by means of a flow pump in axial longitudinal section, FIG. 2, portions of the flow pump in accordance with a first exemplary embodiment in an enlarged representation in an axial cross section, FIG. 3, the flow pump in a cross section along the lines III--III in FIG. 2, FIG. 4, portions of the flow pump in a modified embodiment in cross section, FIG. 5, portions of the flow pump in a further modified embodiment, FIG. 6, portions of the flow pump in accordance with a second exemplary embodiment in longitudinal section, FIG. 7, the flow pump in cross section along the lines VII--VII in FIG. 6, FIG. 8, the flow pump in cross section in a modified embodiment, FIG. 9, portions of the flow pump in longitudinal section in accordance with a third exemplary emb

REFERENCES:
patent: 4948344 (1990-08-01), Cygnor
patent: 5516529 (1996-05-01), Niederkofler et al.
patent: 5551842 (1996-09-01), Schmid et al.

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