Pumps – Motor driven – Electric or magnetic motor
Patent
1997-08-29
2000-08-01
Thorpe, Timothy S.
Pumps
Motor driven
Electric or magnetic motor
415197, F04B 1700
Patent
active
060957719
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a unit for conveying fuel.
One such unit is known from German Patent Disclosure DE 40 20 521 A1. This unit has a flow pump, which has an impeller revolving in a pump chamber as its conveying means. The pump chamber is formed by an intake cap that closes off the pump housing on the intake side and by an intermediate housing. Such housing parts are usually made from metal, preferably anodized aluminum. The conveying means revolving between the housing parts is made from plastic and contains embedded glass fibers elements in order to increase its strength. After even a short period of operation, increased wear can occur in a flow pump of this kind. Dirt brought in from outside, especially, can cause abrasion of the anodized aluminum layer and of the surface of the impeller.
German Utility Model DE-U 91 02 825 also discloses a unit for conveying fuel, which has a pump chamber in which at least parts of the multiple-part pump housing are produced from ceramic material. By this means a wear-resistant wall of the pump chamber can be created which moreover is capable of lessening the development of irritating and undesired noise. This kind of pump chamber is provided in internal gear pumps. Because of the geometrically simply designed housing parts for forming a pump chamber of the internal gear pump, simple and economical production from ceramic is possible. This is not true for flow pumps, since the housing parts that form the pump chamber have a relatively complicated geometrical design.
SUMMARY OF THE INVENTION
The unit according to the invention has the advantage over the prior art that an economical design of a pump chamber is possible which moreover has a high service life, because of the at least one wear-resistant insert pointing toward the conveying means. As a result, the regions of the pump chamber that are subject to severe wear can be provided with wear-resistant inserts, so that for the remainder, inexpensive materials can be used which usually also make simple production possible. At the same time, this embodiment according to the invention has the advantage that the development of irritating and undesired noise can be lessened.
By using ceramic, a highly wear-resistant insert can be created which allows a long service life of the flow pump. Another embodiment according makes it possible for geometrically complicated housing parts to be produced inexpensively as injection molded parts made of plastic or metal. The external dimensions of the housing parts can correspond to the previous housing parts made of aluminum or metal, so that the housing parts embodied according to the invention can be processed in the same way, without changing the assembly systems. Another embodiment offers the advantage that the feed channel can be embodied in the housing part, while the insert merely needs to have an aperture in the region of the feed channel, which allows easy production of the insert. A further embodiment enables simple securing of the insert to the housing part.
BRIEF DESCRIPTION OF THE DRAWINGS
Three exemplary embodiments of the invention are shown in the drawing and described in further detail in the ensuing description. FIG. 1 shows a unit for conveying fuel with a flow pump, shown in longitudinal section, having a wear-resistant insert in accordance with a first exemplary embodiment; FIG. 2 is a front view in the direction of the arrow II in FIG. 1 of the wear-resistant insertion; FIG. 3 shows the flow pump in longitudinal section with the insert in accordance with a second exemplary embodiment; and FIG. 4 shows the flow pump in longitudinal section with the insert in accordance with a third exemplary embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A unit shown in FIG. 1 serves to convey fuel from a supply tank, not shown, to the internal combustion engine, also not shown, of a motor vehicle. The fuel conveying unit has a flow pump 11, with a conveying means 12 in the form of an impeller, which is connected in a manner fixed again
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Krauter Lothar
Lang Harald
Schelhas Peter
Schmieder Dietmar
Robert & Bosch GmbH
Striker Michael J.
Thorpe Timothy S.
Torrente David J.
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