Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1996-10-11
1998-07-28
Kwon, John T.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 552, 415 554, F04D 500
Patent
active
057854904
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fluid pump as defined hereinafter.
One such fluid pump is known from U.S. Pat. No. 5,310,308. This fluid pump serves to feed fuel and has a pump impeller, provided with vanes, that is driven to rotate. The pump impeller is disposed in a pump chamber that is bounded by one wall portion each in the direction of the rotary axis of the pump impeller. An intake opening is formed in one wall portion and an outlet opening in the other. In each of the end faces toward the pump impeller of the two wall portions there is one supply conduit, extending circumferentially from the intake opening to the outlet opening.
The intake opening discharges at the beginning of the supply conduit in the one wall portion, while the outlet opening discharges at the end of the supply conduit of the other wall portion. The outlet opening has an opening wall, which defines the supply conduit into which the outlet opening discharges in the rotational direction of the pump impeller, and that comes to an end, on the face end toward the pump impeller of the wall portion, in the form of an edge that is rounded. This opening wall also extends approximately at right angles to the end face toward the pump impeller of the wall portion. In this embodiment of the fluid pump, severe flow turbulence and eddies are created in the region of the outlet opening, leading to losses in supply pressure and efficiency in the fluid pump. During the operation of this fluid pump, annoying noises also arise, which are likewise caused by the unfavorable flow conditions in the region of the outlet opening, which conditions cause parts of the fluid pump and especially its wall portion to vibrate.
ADVANTAGES OF THE INVENTION
The fluid pump of the invention has the advantage over the prior art that by the inclined disposition of the inner portion of the edge of the outlet opening, a favorable flow course in the region of the outlet opening is attained, and compared with the known fluid pump, the fluid pump has a higher supply pressure and higher efficiency.
A advantageous embodiments and further features of the fluid pump of the invention are disclosed hereinafter. An outflow from the supply conduit into which the inlet opening discharges is attained that has fewer losses, and this an increase in both the supply pressure and efficiency is attained. Moreover, by this further feature, a reduction in the noise created by the fluid pump during its operation is achieved. The characteristics set forth herein likewise enable an outflow with fewer losses from the supply conduit into which the inlet opening discharges, thus again enabling an increase in the supplying pressure and efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
One exemplary embodiment of the invention is shown in the drawing and described in detail in the ensuing description. FIG. 1 shows a fluid pump in a fragmentary longitudinal section. FIG. 2 shows a fragmentary cross section through the fluid pump along the line II--II of FIG. 1 in a region of the outlet opening; FIG. 3 is a fragmentary cross section through the pump along the line III--III of FIG. 1 at the end of the supply conduit; and FIG. 4 is a fragmentary cylinder jacket section through the fluid pump taken along the line IV--IV of FIG. 2 and FIG. 3.
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A fluid pump shown in FIGS. 1-4, which in particular serves to pump fuel from a supply tank to the internal combustion engine of a motor vehicle, has a pump impeller 10, which has one ring each, beginning at its two face ends, of spaced-apart vanes 12 or blades disposed over the circumference of the pump impeller 10. The vanes 12 may be joined together via a ring 13 on their radially outer ends. The pump impeller 10 is driven via a shaft 14 to revolve about an axis 16, for instance by means of an electric motor, not shown. The pump impeller 10 is disposed in a pump chamber 17, which is bounded in the direction of the rotary axis 16 of the pump impeller 10 by one wall portion 19 and 20 on each end. In the rad
REFERENCES:
patent: 3356033 (1967-12-01), Ullery
patent: 3459130 (1969-08-01), Skinner
patent: 4412781 (1983-11-01), Abe et al.
patent: 5558490 (1996-09-01), Dobler et al.
Dobler Klaus
Huebel Michael
Strohl Willi
Greigg Edwin E.
Greigg Ronald E.
Kwon John T.
Robert & Bosch GmbH
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