Pumps – Motor driven – Electric or magnetic motor
Patent
1998-07-20
2000-09-05
Walberg, Teresa
Pumps
Motor driven
Electric or magnetic motor
417366, 415 551, F04B 1700
Patent
active
061133620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a flow pump for the conveying of fluids from a storage tank to a fluid consumer, particularly for the conveying of fuel from a fuel tank to a fuel injection system of an internal combustion engine.
A flow pump of this species is known, for example, from DE 40 20 521 A1, and is used in internal combustion engines with fuel injection systems for the supply of fuel from a fuel tank to the fuel injection system. A fuel injection system with an integrated fuel flow pump in the fuel tank is for example known from U.S. Pat. No. 4,649,884. The electrically powered flow pump in these fuel injection systems always conveys sufficient fuel from the fuel tank, independently of the actual fuel consumption of the internal combustion engine, so that the maximal fuel consumption of the internal combustion engine and any additional quantities required by the system are completely covered. The pressure in the excess quantity of fuel is reduced in a pressure regulator and it is returned again into the fuel tank via a return line. The pressure regulator thus represents a regulated choke cross section, in which the hydraulic energy carried along by the fuel under pressure is transformed into current turbulence, heat and partially also evaporating heat. In this way, on average approximately 90% of the hydraulic output generated by the flow pump are destroyed again.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a flow pump for conveying fluids from a storage tank to a fluid consumer, which avoids the disadvantages of the prior art.
In keeping with these objects, one feature of present invention, resides, briefly stated, in a flow pump in which a further pump inlet for connection of a return line returning a conveyed surplus is provided, and the further pump inlets open into a side channel at a distance from the channel start and at a distance from the channel end.
When the flow pump is designed in accordance with the present invention, it has the advantage, that by introducing the returning surplus conveyed quantities into the side channel of the flow pump, the pressure of the returning conveyed quantity is reduced in the pressure regulator to only a pressure, which is built up by the flow pump at the mouth of the return line, and it is reintroduced into the flow pump at this remaining pressure. In this way a large part of the hydraulic energy generated by the flow pump during the conveying action is fed back into the flow pump, so that the degree of efficiency of the flow pump is significantly improved. Naturally the improvement of the degree of efficiency depends on the returning quantity and thus the actually used quantity of fluid. In connection with internal combustion engines, the degree of improvement of the efficiency is maximal when running in neutral and minimal when under full load. In all cases, however, the result is a reduced performance of the flow pump as a function of the quantities used.
The degree of improvement of the efficiency also depends on the location in the side channel where the returned conveying quantity is reintroduced. In accordance with a preferred embodiment of the invention, a point of the side channel has proven as optimal, where approximately 60 to 70% of the final pressure of the flow pump is built up.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail in the following description by means of an exemplary embodiment represented in the drawings. Shown are in:
FIG. 1, a lateral view of the flow pump, partially in section, in a fuel conveying cycle with a fuel conveying line, fuel injection system and fuel return line of an internal combustion engine,
FIG. 2, a plan view of a housing cover of the flow pump in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The flow pump shown in lateral view, and partially in section in FIG. 1, also called side-channel pump, is used for conveying fuel out of a fuel tank, not represented, to a fuel injection system 10 of an inte
REFERENCES:
patent: 4649884 (1987-03-01), Turckey
Eiler Erich
Rose Jochen
Schmieder Dietmar
Strohl Willi
Pwu Jeffrey C
Robert & Bosch GmbH
Striker Michael J.
Walberg Teresa
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