FR2783569A1 - FUEL SUPPLY SYSTEM - Google Patents

Abstract

Fuel supply installation comprising a supply pump (8) driven by an electric motor (10), housed in a housing (11) also receiving a filter (9, 19) upstream and downstream of the filter. An electric line (12a) supplying the electric motor (10) and whose polarity corresponds to the mass of the tank (1), is produced without electrical insulation; this line is brought into close mechanical contact with the pipes (15, 23, 25) to avoid any electrical charge of parts traversed by the fuel.

Description

State of the art

  The invention relates to a feeding installation.

  fuel ration including a fuel supply pump

  dragged by an electric motor; a housing receiving the electric motor, the supply pump and a filter installation upstream and downstream of the pump in the direction of flow of the fuel and, connecting pipes for driving the flow of fuel in the direction

  supply and to a tank flange forming the neck

tank circle.

  Fuel supply systems according to the type defined above are already known in which

  the fuel is transferred from a tank for example a system

  injection nozzle for the internal combustion engine of a vehicle

automobile.

  Such a supply installation is known from document DE 44 44 854 A1 in which the supply pump is driven by an electric motor and the fuel passes through an upstream filter at the front of the supply pump to pass into a main filter downstream

  of the feed pump and under supply pressure

  tation. These components are housed in a neck filter pot.

  removable ring; the electric motor and the pump

  feed are located in a central chamber; thread-

  the main one is housed concentrically around this room.

bre in an annular chamber.

  The cover of the filter pot of this known device has connections for the connecting pipes or

  pressure pipes through which, inter alia, fuel

  rant is sent to a tank connection flange

  fuel. The supply system thus forms a mo-

  complete transfer module which is mounted directly in the tank; fuel can be drawn into the tank

  under the power module; above the connecting flange

  tank cover cord, it supplies the engine with

  internal combustion via a supply line.

  It is important in such arrangements to avoid any electric shock which could ignite the

  fuel or the fuel-air mixture in the tank.

  The corresponding discharge of electrostatic charges from parts made largely of plastic and which

  are only weakly electrically conductive or non-conductive

  trices is a difficult operation to carry out. Advantages of the invention

  The object of the present invention is to avoid

  of the known solutions and for this purpose relates to a fuel supply installation characterized in that:

  - an electrical connection line for controlling the electric motor

  sheet whose polarity corresponds to the mass of the fuel tank is produced without electrical insulation and, - this connection line is brought into electrical contact with all the components of the fuel system and of the fuel tank and in close mechanical contact with

  the connecting pipes to avoid any electric charge

  as parts through which the fuel passes.

  This makes it possible to easily evacuate the char-

  static due to the fact that the electrical connection line supplying the electric motor which is at the potential of

  mass of the fuel tank, is not isolated. This li-

  connecting link is in contact with all conductive parts

  electricity from the supply system and the tank. By close mechanical contact with the connecting tubes, it is simply avoided that the parts crossed

  by the fuel does not charge electrically.

  In a particularly advantageous manner, the non-insulated connecting line is generally the pole cable

  negative which surrounds the connecting pipes several times.

  Good electrical contact and uniform ground potential are achieved, advantageously if the non-insulated connection line is electrically fixed by eyelets to the housing of the supply installation and to the tank flange. fuel, by

  example by knots or loops.

  The earth connection of the power supply

  tation and of the fuel tank to the electrically conductive parts of a motor vehicle can be done according to the invention in a simple manner by the control connectors of the electric motor of the fuel pump. Thus, no additional parts are required to make the ground contact, since the grounding cable is obtained without

  additional connector nor switch and means of connection

  sound, thanks to the fuel pump control.

  According to other advantageous characteristics of the invention: * the connection line without insulation surrounds the connection pipes or tubes at least once; * the non-insulated connection line is connected to an electrical conduction to the eyelets of the installation box

  to the supply flange and closing the tank

  fuel supply to make an electrical connection, To the earth connection of the supply system and the tank with the electrically conductive parts of a motor vehicle is provided by a connector used to supply the electric motor of the pump

  food; the electrical potential is the negative pole

  tif of the vehicle's electrical system.

  Drawings The present invention will be described below in more detail with the aid of an exemplary embodiment of a fuel supply installation shown diagrammatically in the accompanying drawings in which: The only figure is a section of a pre-assembled fuel supply system to be installed

in a fuel tank.

  Description of the exemplary embodiment

  The figure shows a longitudinal section of a re-

  fuel tank 1 fitted with a supply module or supply installation 2; this installation is placed from above through an opening 3 in the tank of

  fuel 1. Opening 3 closes with a fuel flange

  see 4. The tank flange 4 has a nozzle 5 for a supply line, not shown, connected to the vehicle engine. The fuel flows in the direction of the

  arrow 6. The tank flange 4 also has a branch

  for return line 7 coming from the combustion engine

  internal bustion and a pressure regulator 35 whose role

  need not be described for the understanding of the invention.

  The supply installation 2 comprises in its lower part, a supply pump 8 which sucks the

  fuel at the bottom of the tank 1 through an upstream filter 9.

  The feed pump is driven by an electric motor.

  that 10 located above the pump 8 in the center of a filter pot 11 forming the housing of the supply installation 2. The electric motor 10 is supplied with electric voltage by the connection lines 12a, 12b; the engine is controlled by these lines; the cover 13 of the electric motor 10 is

  made here of a conductive material.

  A pipe 15 is connected to a nozzle 14 of the mo-

  electric tor. The connecting pipe 15 passes the fuel

  rant by a nozzle 16 in an outer chamber 17 of the pot

  filter 11 in the direction of arrow 18. Concentric-

  around the central chamber housing the electric motor

  that 10, the filter pot 11 has a filter element

  main 19 separating the filter pot 11 by an-

  20 in an outer chamber 17 and an inner chamber

  lower 21. The fuel filtered by the main filter element 19 leaves the inner chamber 21 to arrive

in nozzle 22.

  The nozzle 22 is connected to a pipe 23 which provides the connection with the tank flange 4 so that the fuel can pass in the direction of the arrows 24 and 26 from the interior chamber 21 of the filter pot 11 in the exterior pipe. The fuel return pipe 7 is connected by a tubular pipe 25 to a nozzle 26 of the fuel tank.

fuel 1.

  According to the invention, the connecting line 12a of the

  negative pole of the electric motor has no insulation

  tion and passing inside the tank 1, this line firstly surrounds the tubular fuel return pipe 25, then passes around an eyelet 30 of the cover 31 of the filter pot 11 and around the tank 1 ( this plot is

  represented by a broken line). Then the line of liai-

  its 12a of the exemplary embodiment as shown, surrounds the pipe 15 twice then, it is fixed in an eyelet 32 of the pressure regulator 35 and twice surrounds the connection pipe 23 then arrives on the motor terminal 33

electric 10.

  A very largely uniform electric field is thus produced throughout the fuel circulation path in the supply installation 2 and in the fuel tank 1. By a plug contact 34 for the lines 12a, 12b, for the supply of the electric motor 10, the tank 1 or the tank flange 4 are

  thus connected to the electrical ground for example to the negative pole

  the internal combustion engine of the vehicle so that this supply system 2 cannot produce any

dangerous discharge.

Claims (5)

R E V E N D I C A T I ON S   1) Fuel supply installation comprising a supply pump (8) driven by an electric motor (10), - a box (11) receiving the electric motor (10), the supply pump (8) and a installation of filter (9, 19) upstream and downstream of the pump (8) in the direction of fuel flow and, - connecting pipes (15, 23, 25) to direct the flow of fuel in the direction of 'supply (2) and to a tank flange (4) forming the tank cover (1), characterized in that - an electrical connection line (12a) for controlling the electric motor (10) whose polarity corresponds to the mass of the fuel tank (1) is produced without electrical insulation and, - this connection line (12a) is brought into electrical contact with all the components of the supply installation   (2) and the fuel tank (1) and in mechanical contact   only narrow with the connecting lines (15, 23, 25) to avoid any electrical charge of the parts through which the fuel passes.   2) Fuel supply installation according to the resale   dication 1, characterized in that the connection line (12a) without insulation surrounds at least one   times the connecting pipes or tubes (15, 23, 25).   3) Fuel supply installation according to one of the claims 1 or 2, characterized in that   the non-isolated connecting line (12a) is connected to a conduc-   electrical supply to the eyelets (30, 32) of the supply system housing (2) and to the tank flange   (4) closing the fuel tank to make a connection its electric.   4) Fuel supply installation according to one of the preceding claims,   characterized in that the earth connection of the supply installation (2) and 5 of the tank (1) with the electrically conductive parts of a motor vehicle is provided by a connector (34)   used to supply the electric motor (10) of the supply pump (8).   5) Fuel supply installation according to one of the previous claims, characterized in that   the electrical potential is the negative pole of the electrical system vehicle.