FR2634520A1 - IMPROVEMENTS RELATING TO THE CONSTRUCTION OF FUEL PUMPS - Google Patents

Abstract

The invention relates to improvements made to the construction of fuel feed pumps which consist, on the one hand, of a special construction of the body and of a cover 3 of the stator 1, as well as of the rotor 2 housed between them. elements, to obtain two pumping phases in series, the first of the centrifugal-pushing type and the second exclusively of the pushing type, and which, on the other hand, are constituted by a modular construction of the pump, which allows the successive coupling coaxial inside a tube which serves as a frame 7, the body of the stator 1, the rotor 2, the cover 3 of the stator, an electric motor 4 and an upper body 5, the frame being then closed , the maintenance in the axial direction of all the elements located inside the carcass being obtained by crimping the ends.

Description

The present invention relates to improvements

  to the construction of fuel pumps

  ble, more specifically petrol pumps intended

  to supply the carburetor, under reduced pressure, with the

  fuel from the tank, this pump being normally

immersed in essence.

BACKGROUND OF THE INVENTION

  Traditionally, petrol pumps,

  regardless of whether they are mechanically operated

  cally or electrically, are located outside the network

  see fuel, which means that during operation

  normal vehicle while there is an overpressure

  between the pump and the carburetor, between the latter and the tank there is a vacuum which gives rise to an effect of vaporization of the petrol, detrimental for

  the proper functioning of the installation.

  This problem is further accentuated if one takes into account the fact that such an installation is subjected to high temperatures due to its proximity to the engine and to the reduction of the ventilation of the compartment in

  which it is housed, reduction generated by the aerodyna-

  an ever-growing body mismatch.

DESCRIPTION OF THE INVENTION

  The improvements according to the invention are

  based on the use of an electrically driven pump

  and on the installation of this pump inside

  of the fuel itself, so that the entire installation

  fuel supply to the carburetor is subject

  at a certain pressure, thereby significantly reducing

  map out the vaporization problems mentioned above.

  The improvements according to the invention allow

  put to get a reduced volume and cost pump

  minimum, due to its modular construction, in the-

  which the motor is an element integrated in the pump pro-

  prement said and which constitutes a single part which can be assembled easily in the unit, which makes it possible to use a motor of quality and satisfactory prices

  manufactured by specialized manufacturers.

  On the other hand, the pump has, in addition to minimum dimensions, complete reliability and maintains its operating characteristics for a long time.

  useful life, while requiring a minimum of pre-

  mother. More precisely, a pump produced in accordance with the improvements of the invention is of the rotary, non-volumetric type, of reduced diameter and of high flow and pressure characteristics, although it operates at an abnormally low rotation speed, this

  which is extraordinarily interesting for reducing the usu-

  re of the motor and the components of the pump.

  To this end, the. pump is of modular construction

  laire, and it comprises an electric motor with low rotation speed, which is intended to be connected on one side to a pumping body consisting of three parts, body which accesses the fuel to be discharged, while, on the opposite side

  the electric motor is connected to a body which serves as a con-

  electric nector and fuel drain pipe, all located inside a tubular carcass

  which is fixed to this assembly by a rim formed by

  weaving at its mouths, to obtain a set in which all the constituent elements are held

  perfectly after being connected axially.

  The three parts which form part of the pumping body and which are connected axially to each other, consist of a stator body provided with a tube.

  axial fuel intake, -this body having interior

  laughingly the shape of a cylindrical chamber which is connected to the tubing in question by a frustoconical sector and in which is housed the second component part of the rotor, on which is placed the third and last part, which serves as a cover for the stator, and provided with an axial hole for coupling the output axis of the electric motor. The stator comprises, emerging from its bottom, an annular partition which serves as a support for the rotor,

  whose blades, trapezoidal in shape, constitute fins

  your fuel delivery radials. The annular partition is interrupted in a zone which coincides with a tangential outlet ramp, complementary to another ramp also disposed tangentially on the edge of the stator cover, this ramp being intended to form the outlet of an annular channel of constant depth, which exists on the surface of the stator cover, which is

located in front of the rotor.

  The upper body, to which the motor is connected

  electric and in which are installed the means of con-

  electric connection of the latter, axially comprises a

  connecting pipe of the fuel delivery pipe

  towards the carburetor, while in diametric zones

  trally opposite from the base of the hollow body which must

  hold the upper part of the skirt between the walls of her skirt

  electric motor, preferably crenellated skirt, it comprises

  two rods which serve as external terminals for the con-

  electrical conductors supplying the electric motor,

  which, in the area they pass through and inside

  of which they protrude, have the form of

  electrical motor terminal connection clamps.

  Other features and advantages of the

  vention will be better understood on reading the description

  which will follow from an exemplary embodiment and with reference

  to the accompanying drawings, in which: -

  Figure 1 shows an elevational view

  side and sectional view of a discharge pump

  bustible made in accordance with the improvements which constitute the object of the invention;

  Figures 2, 2A and 2B show respective-

  ment in plan the upper part, a view in profile par-

  partially in section and a plan view of the lower part

  stator cover; Figures 3 and 3A show a plan view and a side view of the stator; Figures 4, 4A and 4B show a view

  in side elevation, a plan view and a sec view

  diametral tion of the stator body.

PREFERRED EMBODIMENT OF THE INVENTION

  In these figures, and more specifically in FIG. 1, it can be seen that the pump, according to the invention, is constituted by a stator body 1, inside which

  is housed the rotor 2, which is held axially inside

  laughing stator using a cover 3, these elements being coaxially connected. The rotor 2 is connected to the output axis of an electric motor 4 which is held at its upper end - inside an upper body, which has the shape of a kind of inverted bucket,

  in which the electrical connection terminals 6 are located

  that of engine 4, the assembly being contained in a carcass-

  is metallic 7, the ends of which are crimped to form

  sea rims 8 constituting closure means.

  The body of the stator 1 is extended at its lower part by an intake manifold 9, and between the body of the stator 1, the rotor 2 and the cover of the stator 3, is disposed a pipe which will be described later, and which opens into a chamber 10 located between the wall

  inside of the metal carcass 7 and the outer wall

  electric motor 4, which leads to the interior

  11 of an outlet pipe 12 which is provided with the

  upper part 5 of the body, said tube 12 is des-

  intended to be connected to a corresponding pipe or connected

  fuel line to the carburetor.

  As can be seen in Figures 4, 4A and 4B,

  stator 1 immediately above the tubu-

  lure 9, a cylindrical chamber 13 connected to the rotor 2, and

  inside this chamber 13 is disposed a -cloi-

  its annular ring 14 on which a circular crown rests

  area 15 of rotor 2 which is extended by four paddles

  dials 16 which constitute a first pumping means, centri-

  repressor-repressor, which sucks the fuel through the tube

  re 9 so that it crosses the annular partition 14 through a window formed at a point of this partition and which is extended by a tangential ascending channel 17, which lifts the fuel relative to the upper edge of the partition 14, and au- above which the rotor 2 comprises a plurality of radial blades 18, which constitute a second pumping means, exclusively discharging, which forces the fuel to move along the periphery of the stator body, in a channel 18a extended by a channel 19 provided in the cover 3 of the stator 1, while at one end 20 of this channel is shaped a ramp 21, located opposite a ramp 22 of the cover 3 of the stator, and which opens towards the upper face of this last, so that the fuel

thus reaches room 10.

  The gasoline penetrates axially into the body 1 of the stator and it is driven back by the centrifugal force, exerted by the four radial blades 16 which is endowed with the rotor, towards the peripheral channel 18a of the latter, and through the ascending channel 17 tangential . The radial blades 18 of the upper sector of the rotor 2 subject the petrol or the fuel to an acceleration in the ascending channel 18a, from the channel 17 towards the end 20, or from an end 23 towards an end 24 of the cover 3, and

  which correspond to the ends of channel 19 of this cover

  key, to complete channel 18a of the stator. The petrol exits through the ramp 21 from the stator body and through the ramp 22 from its cover. The two ramps 21 and 22 are located opposite one another, extending the same inclined plane, the stator having a protuberance 25 which, during the mounting of the cover 3, is intended to penetrate into a groove 26 of this last, so as to wedge these two pieces

  in determined angular positions.

  A high efficiency of the pump is ensured if the distance between the discharge blades 18, the surfaces

  and 27 and the cylindrical surface located between the end

  tee 20 and the ramp 21 is of the order of 0.1 mm.

  To prevent gasoline from diverting from the second pumping phase to the first, the circular crown 15 of the rotor is constantly supported on the upper edge of the partition 14, taking advantage of the fact

  that the pressure of the second pumping phase on the

  The plane of the rotor is greater than that of the area of the radial blades, which guarantees contact and tends to keep it stable. To reduce wear in this area,

  the crown 15 of the rotor rests simultaneously on the support

  port 28 of the stator body. In addition, four small holes 29 formed in the rotor 2 serve to reduce the pressure difference between the two sides of the rotor, in order to minimize the pressure of the latter against the stator and, consequently, to reduce wear. . The body

  upper hollow 5 of the pump has on its peri skirt

  spherical four circular slots 30, the internal profile of which allows the motor 4 to be perfectly centered at its upper part, while letting the petrol pass

  crosses the chamber 10 coming from the ramp 22 of the cover

  stator key. Obviously this is possible due to the fact

  the outside diameter of the motor is less than the diameter

  internal meter of the cylindrical carcass, which defines the

  annular chamber 10, as mentioned above.

  The inner centering of the engine with respect to

  to the stator-rotor assembly, is obtained by introducing almost

  The lower part of the motor through the centered hole 31 in the stator cover, the motor axis being provided at its coupling end with the rotor, with one or more flats which allow it to be connected to the rotor. As mentioned above, the upper body 5, constructed

  made of plastic, is crossed by the two electric terminals

  motor supply triques 6, which have at their lower end the shape of a clamp 32.

connection to motor terminals 33.

  The upper body also has a gas discharge hole which allows rapid filling and

  reduces the danger of possible formation of a stopper

fear in the pump.

  Of course, the invention is not limited.

  to the embodiment which has just been described and represented

  smelled. Many modifications can be made

  detail without departing from the scope of the invention.

Claims (5)

R E V E N D I C A T I ONS   1 - Improvements made to the construction   tion of fuel supply pumps, particularly applicable to low pressure electric pumps, which are installed so as to be immersed in the tank.   fuel from a motor vehicle, for refueling   ler the fuel to the carburetor, ensuring an overpressure in the corresponding line, characterized in that the pump is of modular construction, and consists of a stator body (1), a rotor (2) and a   stator cover (3), said pump being arranged in a ma-   means of carrying out two types of pumping simultaneously, the rotor (2) having two parts, which correspond to two parts of the stator (1), the first type of pumping being   centrifugal-upsetting, while the second type is excluded sively repressing.   2 - Improvements to construction   fuel feed pumps, as claimed   tion 1, characterized in that the stator body (1), provided   an axial fuel intake pipe (9), pre-   internally feels a cylindrical chamber (13) in the   which is housed the rotor (2), this chamber comprising two   zones of different heights, one central and more pro-   base, which contains an operating half of the rotor (2), and a peripheral and higher raised annular zone, in which the other sector of the rotor is situated, the two zones being separated by an annular partition (14) on which rests the rotor (2), this partition being interrupted at a point on its periphery, in which a tangential and ascending communication ramp (17) is formed between the two zones, this partition constituting with the periphery   of the stator body and in correspondence with an ex-   dull, a channel which begins in the ramp in question and which is terminated, after having traversed all the periphery of the stator, by another ascending ramp located opposite   a third ramp (19) provided in the cover of the stand   tor, located opposite the previous ramp (18a) and open   te towards the upper face of said stator, to establish the   communication between the pump itself and a cham-   annular bre (10) formed around the motor (4) and which comprises   fitted with the outlet pipe (11,12).   3 - Improvements made to the construction   fuel supply pumps, according to   Claims 1 and 2, characterized in that the rotor (2)   has, on the one hand, in its lower part four parts   the trapezoidals (16), arranged radially and equiangu-   lairement, and, on the other hand, a crown intended to   puyer on an upper edge of the stator bulkhead, a series of radial blades (18) being provided on said rotor   (2) and which cooperate with the peripheral channel of the stator.   4 - Improvements made to the construction   fuel supply pumps, according to   Claims 1, 2 and 3, characterized in that the motor   (4) is a single, independent element   other components of the pump, the outlet shaft   tie of said motor (4) passing through the cover (3) of the stator (1) and being engaged in an axial hole of said rotor (2), and having a flat intended to cooperate with a flat on said output axis said motor (4) being fixed at its end opposite to that provided with the outlet axis by an upper body (5), which has an overturned bucket configuration and the peripheral skirt of which is provided with a   plurality of slots which, while fixing the motor in a   perfectly co-axial with respect to the rest of the elements, constitute communication passages between the annular chamber (10) which surrounds this motor (4) and the outlet pipe (11,12) located in an axial extension of the body upper (5).    - Improvements to construction   fuel feed pumps, according to   dications 1 to 4, characterized in that the rotor has small holes (29) which establish communication   between the two faces of his body to reduce the most pos-   pressure imbalance.   6 - Improvements to construction   fuel feed pumps, as claimed   cations 1 to 5, characterized in that the upper body (5), the electric motor (4), the stator cover (3),   the rotor (2) and the stator body (1) are assembled together   axially in this order and are immobilized in a   final in the axial direction thanks to the existence of a   breakage which surrounds them, constituted by a tube whose ex-   hoppers are crimped to form edges produced by   cold deformation, the carcass (7) having a wedge diameter   cidant with the maximum diameter of the stator (l) in its cover   key (3) and the upper body (5), and which is slightly higher than that of the electric motor (4), to constitute   the peripheral chamber (10) for passage of the fluid.