Peripheral pump, particularly for delivering fuel from a storage

Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump

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Details

415 552, F04D 500

Patent

active

053283252

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a peripheral pump. More particularly it relates to a pump for delivering fuel from a storage tank to the internal combustion engine of a motor vehicle.
In particular it relates to a peripheral pump of the above mentioned general type which has a circular-cylindrical impeller revolving in a pump chamber and provided at least on one of its two end faces with a rim of blades disposed at intervals along the circumference of the impeller. Such a pump in which the common center of the two partial circles lies on the axial gap between the impeller and the chamber wall is already known (U.S. Pat. No. 3,315,607). But the efficiency of such peripheral pumps may not be satisfactory.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a peripheral pump of the above mentioned general type , which avoids the disadvantages of the prior art.
According to the invention, the peripheral pump includes a wall bounding a pump chamber and provided with a substantially annular delivery port with a base having a circular segment with a center; a circular cylindrical impeller revolving in the pump chamber, having two end faces and a rim of blades disposed at intervals along a circumference of the impeller so that a groove-like gap is formed between two adjacent blades, the groove-like gap with a base, as seen in a longitudinal section through the pump, having a circular segment with a center substantially coincident with the center of the circular segment of the delivery port, the center of the circular segments being located within an outer contour of the impeller.
When the peripheral pump is designed in accordance with the present invention, it has the advantage over the prior art that the pump output is increased to a satisfactory degree because the circulating stream Qc can be increased by approximately 20%, other conditions remaining the same. Accordingly, the maximum delivery pressure can be correspondingly increased while maintaining the same external dimensions and operating conditions.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method for operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partially side, partially longitudinal cross-sectional view of a peripheral pump according to the invention;
FIG. 2 is a cutaway detailed longitudinal cross-sectional view of a portion of the peripheral pump shown in FIG. 1;
FIG. 3 is a transverse cross-sectional view through the peripheral pump shown in FIG. 1 taken along the line III--III in FIG. 1; and
FIG. 4 is a graphical illustration showing the increase factor for the circulating stream flow as a function of s/r, where s is the distance of the center of a circular arc segment of the port wall surface from the wall in which the port is formed and r is the port radius.


DESCRIPTION OF THE PREFERRED EMBODIMENT EXAMPLE

A unit 10 shown in FIG. 1 serves to deliver fuel from a storage tank, not shown, to the internal combustion engine, likewise not shown, of a motor vehicle. The fuel delivery unit 10 has a stream pump 12 whose impeller 14 is connected to a shaft 16 so as to be fixed with respect to rotation relative to it, the shaft 16 being driven by an electric drive motor, not shown. The impeller 14 fits on a bearing pin 18 and is arranged in a so-called pump chamber 19 which is defined at both sides--as seen in the axial direction of the impeller 14--by walls 20 and 22. The bearing pin 18 is arranged at the wall 20. The wall 22 has a bearing 24 for the drive shaft 16. During operation of the delivery unit 10 the stream pump 12 sucks fuel through a suction neck 26 and presses this medium, via a pump outlet 28 in the wall 22, into a spac

REFERENCES:
patent: 1973669 (1934-09-01), Spoor
patent: 3871797 (1975-03-01), Igarashi et al.
patent: 4462761 (1984-07-01), Ringwald

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