ES2207095T3 - DEVICE FOR THE SUPPLY OF FUEL TO AN INTERNAL COMBUSTION ENGINE. - Google Patents

Abstract

An accumulator pot (3) is connected to the feed pump (1) on the pressure side, and a fuel supply line (2a) for the injection system is connected to the accumulator above the feed pump. The accumulator axially covers the area of the feed pump and a part of the sealing boundaries. A pressure relief valve (11) is connected preferably to the highest point of the accumulator pot, and is connected to the suction side of the feed pump via a fuel return line (12). A check valve (7) is installed in the suction line to prevent return of drawn-in fuel.

Description

Fuel supply device a An internal combustion engine.

The invention relates to a device for supply of fuel to an internal combustion engine with the characteristics cited in the preamble of the claim principal.

It is previously known through the DE document 195 13 822 A1 a device of the generic type for the supply of fuel from a fuel tank to an engine internal combustion of a motor vehicle. The device consists essentially a supply pump driven by the engine of internal combustion, which is made as a gear pump and is in connection with the fuel tank through a supply duct This gear pump supplies the fuel to the combustion engine injection facility internal

The supply pump forms together with a pump of air supply a structural unit, whose side of suction is connected to a brake force amplifier of the motor vehicle for the generation of a depression.

When the fuel tank has been emptied, for this type of structure there is a risk that the piece of Pump that supplies the fuel is dry. This fact is not advantageous neither for the aspiration process nor for the system of tightness

It is also previously known through the document DE 196 12 605 A1 carry out the fuel supply to an internal combustion engine through a supply pump powered by electric motor, housed in the fuel tank and surrounded by fuel. The supply pump is in union active with a storage container also arranged in the fuel tank In the lower area of this container storage is a separate liquid ejector, to through which the filling of the container is produced and regulated storage. In the fuel supply previously described a second additional pump is necessary to ensure a supply after emptying the fuel tank, which is also away from the usual pump types in the assembly of cars

It is previously known through the DE document 31 41 080 C2 a pump device that is also not of the type generic with a centrifugal pump with self-aspiration. The conduit of suction of this pump is shaped in such a way that after stopping the pump is a certain amount of liquid in it. TO the first start-up, the pump sucks this amount of liquid, it can thereby aspirate itself, and then deaerate and fill for a normal supply.

The invention is based on the task of improving a generic type supply pump in relation to its suction behavior after emptying the tank fuel and then get your own deaeration.

The solution according to the invention of the task is produced by the properties mentioned in the part characterizing the claims. The advantages of the invention they consist of the optimal constructive structuring of the unit of pump with a storage vessel located on the side of high pressure. Once the fuel tank has been emptied, produces a fast fuel supply with deaeration Simultaneously, and with this a quick engine start is possible. The characteristics of the dependent claims are explained in the description in relation to its effects.

With the help of a drawing described below An example of embodiment of the invention.

They show:

Figure 1 the scheme of a feed of fuel for a combustion engine,

Figure 2 an embodiment depicted schematically of the structural unit supply pump - storage container,

Figure 3 the scheme of the container of storage as cut representation according to the line A-A in figure 2.

In figure 1 they are schematically represented essential parts of the fuel feed for an engine combustion. A supply pump 1 driven by the motor combustion sucks fuel from a fuel tank 5 and first fill a storage container 3, which at the same Time is also deaerated. In the suction duct 6 of the supply pump 1 is a check valve 7 that is opens in the direction of fuel pump 1, and prevents return of fuel sucked into the fuel tank 5.

One or more high pressure ducts 2a of fuel are connected above the supply pump 1 to storage container 3 (figures 2 and 3), and feed a injection pump or pump-nozzle elements with fuel (neither object is represented). The fuel not fed to the internal combustion engine by the injection pump or pump-nozzle elements flows through a return duct 8 and a valve initial pressure 9 back to the fuel tank 5.

Storage container 3 covers axially the area of the supply pump 1 and a part of the adjacent tightness limits (figures 2 and 3). The boards of tightness 10, which form the tightness limits and consist for example in circular rings, they are permanently in contact with fuel over a large part of its extension in the area of storage container 3.

Preferably, in the highest area of the storage vessel 3 a limiting valve is connected Pressure 11. This pressure relief valve 11 opens at a pressure higher than the initial pressure valve 9. The return of fuel is produced through the pressure relief valve 11 and a return duct 12 towards the suction side of the supply pump 1.

When the fuel tank 5 has been drained, a minimum level of fuel 13 remains in the container storage 3 (figure 3). When supply pump 1 is stopped, the storage container 3 tries to fill the spaces of supply of that one from the side of high pressure. To the occur this, fuel slides through the slots of the supply elements and fill all the supply spaces of the bomb.

When the pump is restarted supply 1, which is preferably made as a pump Gears, shut-off vane pump or fin pump, is produced immediately, without a deaeration from outside, a supply of fuel without obstacles to the combustion engine, because the Pump spaces are already full.

Claims (5)

1. Device for the supply of fuel to an internal combustion engine with a supply pump to feed an injection installation, which is made as a gear or fin pump that preferably supplies directly from the fuel tank and is driven by the internal combustion engine, characterized in that a storage vessel (3) is connected next to the supply pump (1), in which a fuel supply line (2a) or respectively some ducts Fuel supply, directed towards the injection installation, is connected or respectively connected to the storage vessel (3) above the supply pump (1). 2. Device according to claim 1, characterized in that the storage vessel (3) axially covers the area of the supply pump (1) and a part of the adjacent sealing limits. Device according to claim 1, characterized in that a pressure limiting valve (11) is preferably connected to the highest area of the storage vessel (3). Device according to claim 3, characterized in that the pressure limiting valve (11) is connected through a fuel return line (12) to the suction side of the supply pump (1). Device according to claim 1, characterized in that a check valve (7) which prevents a return of sucked fuel is arranged in the suction line (6) of the supply pump (1).