EP0147330A1 - Membrane pump for the fuel supply of a vehicle engine. - Google Patents

Membrane pump for the fuel supply of a vehicle engine. Download PDF

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Publication number
EP0147330A1
EP0147330A1 EP84402717A EP84402717A EP0147330A1 EP 0147330 A1 EP0147330 A1 EP 0147330A1 EP 84402717 A EP84402717 A EP 84402717A EP 84402717 A EP84402717 A EP 84402717A EP 0147330 A1 EP0147330 A1 EP 0147330A1
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EP
European Patent Office
Prior art keywords
valve
cylindrical
discharge
upper body
suction
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84402717A
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German (de)
French (fr)
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EP0147330B1 (en
Inventor
Jean Marye
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Rivapompe SA
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Rivapompe SA
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Publication date
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Publication of EP0147330A1 publication Critical patent/EP0147330A1/en
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Publication of EP0147330B1 publication Critical patent/EP0147330B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/046—Arrangements for driving diaphragm-type pumps

Definitions

  • the present invention relates to a diaphragm type pump, used in particular to supply petrol to the carburetor of a motor car engine.
  • the diaphragm type petrol pumps currently used generally comprise an upper body and a lower metal body, in the form of hollow containers, open at one end, and the respective free edges of which are applied to one another by pinching between them the peripheral edge of a deformable membrane, for example of rubber, the assembly being kept thus assembled by means of screws passing through flanges formed on said edges of the upper and lower body, or by crimping if the upper part is made of sheet metal.
  • the lower body is clamped on the motor and receives a pusher driven by an alternating linear movement transmitted to the membrane either directly by an eccentric of a motor shaft, or by means of a tilting lever.
  • the upper body comprises a suction port and a discharge port conventionally fitted with valves and possibly with a filter screen.
  • the upper and lower bodies of these pumps are generally made of metal, for example of zinc or aluminum alloy, or even of welded stamped sheet metal, but these metals have a relatively high cost of implementation, and their use is reflected naturally by an increase in the cost price of the pump. In addition, because of their high thermal conductivity, these metals are brought quickly to the temperature prevailing under the hood and which can sometimes rise to more than 100 ° C, especially from stopping the engine. This results in vaporization of the gasoline inside the pump and therefore a difficulty in leaving for the car.
  • the upper body of such a pump is formed by two cylindrical housings, one serving as a suction chamber and the other as a discharge chamber, and with which an intake manifold and a discharge manifold have been molded respectively. different directions.
  • the housings are independent of each other and are interchangeable, so that it is possible to carry out a certain number of combinations of positions of the inlet and outlet pipes. However, this number of combinations remains limited, so that if it is desired to obtain a combination of positions other than those which are permitted, it is necessary to make other molds for housings.
  • the object of the present invention is to remedy all these drawbacks of known pumps by proposing a diaphragm pump of light structure, which is not subject to the phenomenon of vaporization of petrol and which is capable of being produced automatically on a large scale. series and therefore at a relatively low price, using a single model of mold, the pump can still be adapted to any type of car engine.
  • the invention relates to a diaphragm pump, in particular for supplying petrol to a motor vehicle engine, of the type comprising an upper body and a cylindrical lower body, open at one end and assembled by their free edge. by means of an elastic crimping collar by pinching between them the peripheral edge of a deformable membrane, the central part of which can be moved in an alternating movement along the axis of the pump, so that the petrol is alternately sucked through a suction port and a suction valve in a suction chamber formed in the upper body, then discharged from a discharge chamber through a discharge valve and a discharge port, characterized in that the body upper is formed in one piece by molding of a thermoplastic material and is divided, by a cylindrical partition tangent internally to the body so as to define inside, the chamber suction, and outside, the discharge chamber, in that the suction and discharge valves are carried by a substantially circular valve holder, independent of the upper body and which is also pinched between the upper body and the body lower, said valve
  • said tubes are manufactured separately, then they are fixed in the desired orientation at the time of assembly, for example by ultrasonic welding.
  • the upper body of the pump can therefore consist of a standard piece of immutable shape, which can be used in all types of motors. Due to its elasticity, the flange makes it possible to obtain a permanent elastic connection between the two bodies, which ensures good crushing of the edge of the membrane and therefore good sealing. It is therefore possible to automate the assembly of the pump, by using robots or specialized automatic machines.
  • the fuel pump 10 essentially comprises an upper body 12 and a lower body 14, both made of a thermoplastic material of good mechanical strength and good resistance to the relatively high temperatures prevailing under the hood of the car.
  • the bodies 12 and 14 are constituted by substantially cylindrical containers, open at one end and the respective free edges of which are applied to one another, crushing between them the peripheral edge of a deformable membrane 16, for example made of rubber , and the peripheral edge of a rigid valve holder 18. To this end, the two bodies are secured by means of an annular flange 20 of elastic sheet, which is crimped on annular flanges 22, 24, formed respectively on said edges of the bodies.
  • the collar initially has a section with three branches, the upper branch 26 of which is intended to be applied against the horizontal shoulder 28 of the flange 22 of the upper body, is inclined internally relative to the horizontal of a small angle a.
  • this branch deforms elastically to apply to the shoulder 28 by exerting on the flanges 22, 24 and therefore on the edges of the membrane 16 and of the valve holder 18 an elastic tightening which guarantees a perfect seal between the two bodies.
  • the upper body 12 is divided internally by a substantially cylindrical partition 30 tangentially connecting to the wall of the body 12, in a suction chamber 32 inside said partition and in a discharge chamber 34 outside said partition.
  • the discharge chamber internally has partial partitions, which, drawn in an appropriate manner, make it possible to isolate volumes which act as a damper promoting the flow rates.
  • the valve holder 18 includes a portion which fits into the opening of the suction chamber 32, an O-ring 36 ensuring sealing. Said valve holder portion as well as the remaining portion which is located opposite the delivery chamber are respectively provided with orifices, closed in a manner known per se, by valves 38, 40 loaded by springs 41. suction valve 38 is mounted a screen 43 for filtering the gasoline arriving from the tank.
  • the upper body 12 has, on its bottom wall, two orifices 42 and 44, which open respectively into the suction chamber 32 and into the discharge chamber 34.
  • an adjustable suction pipe 46 connected to the vehicle's fuel tank and an adjustable delivery pipe 48 connected to the carburetor.
  • these pipes are welded at the time of assembly, with the orientation desired by the user.
  • the upper body also has in its cylindrical wall an orifice 50 which opens into the delivery chamber and on which is fixed a tube 52 intended to bring the fuel back to the tank in the event of the car.
  • the central portion of the membrane 16 is sandwiched between a support flange and a counter plate 56 to which it is secured by means of a rivet 58.
  • the flange carries an L-shaped arm 60 connected by a free travel link to the upper end of a pusher 62 which extends along the axis of the lower body 14.
  • the pusher projects outside the lower body through an orifice formed in the bottom of the latter, a seal 64 sealing at this orifice.
  • the membrane-flange and counter-plate assembly is normally biased upwards in FIG. 1 by a compression spring 66 resting on the flange 54 and on the bottom of the lower body.
  • the pusher 62 can be pressed inside the lower body, against the force of a spring 68 of greater hardness than that of the spring 66.
  • the pusher can be actuated either by the eccentric of a motor shaft , or by a tilting lever.
  • the pump is in the state shown in FIG. 1: the pusher 62 is brought into its low position by the return spring 68; the stop 70 of the pusher resting on the arm 60 lowers the assembly of the membrane 16, of the support flange 54 and of the counterplate 56.
  • the cam pushes the pusher, said movable assembly being released, it is pushed upwards in FIG. 1 by the prestressed spring 66.
  • the gasoline which is in the chamber 72 defined between the membrane 16 and the valve holder 18 is discharged through the valve 40 and the manifold. discharge 48 to the carburetor.
  • the pump according to the invention is much more efficient, more lightweight, more economical than the best diaphragm pumps currently known on the market.
  • it can be manufactured fully automatically in large series, since it only requires one model, the pipes being welded at the time of assembly, with the desired orientation.
  • the pump shown in FIG. 5 differs from that of FIG. 1 only in that the pusher 62 is directly fixed to the membrane 16, flange 54 and counter plate 56 assembly and that the pusher is actuated by a lever. tilting 76.
  • the latter is pivotally mounted about an axis 78 and is urged to bear against a cam 80 of a drive shaft by a spring 82.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)

Abstract

1. Diaphragm pump for supplying petrol to a motor vehicle engine, of the type comprising : a first cylindrical body 12 closed at one end by a base which has an induction orifice (42) and a delivery orifice (44), the said body being divided internally by a cylindrical partition (30) attached to the said base and defining within it an induction chamber (32) and outside it a delivery chamber (34) into which the said induction and delivery orifices open respectively a second body (14) in the form of a cup, the said bodies (12, 14) being provided at their open ends with seating flanges (22, 24) ; a circular, deformable diaphragm (16) ; a circular valve-holder (18) which is provided with an induction valve (38) and a delivery valve (40) and which has a projecting tubular portion ; and an elastic collar (20) which clamps the said flanges (22, 24) onto the peripheral edges of the diaphragm and of the valve-holder, the said projecting tubular portion of the valve-holer making a sealed fit within the said cylindrical partition, characterised in that the said cylindrical partition (30) comprises a first cylindrical portion adjacent to the base of the first body and the wall of which blends with the cylindrical wall of the said first body without forming an extra thickness at their common tangent, and the said cylindrical portion being extended by a second coaxial cylindrical portion, with an internal diameter greater than that of the first cylindrical portion, in that the projecting tubular portion of the valve-holder penetrates the said second cylindrical portion of the partition to define with the inside wall of the latter an annular gap in which is fitted an O-ring (36) of such dimensions that it occupies only a fraction of the height of the second cylindrical portion of the partition and of the tubular portion of the valve-holder, in that the said first body is formed in one piece by moulding a thermoplastic material and in that the induction (42) and delivery (44) orifices are provided with nipples (46, 48) welded to the said orifices.

Description

La présente invention concerne une pompe du type à membrane, servant notamment à alimenter en essence le carburateur d'un moteur de voiture automobile.The present invention relates to a diaphragm type pump, used in particular to supply petrol to the carburetor of a motor car engine.

Les pompes à essence du type à membrane actuellement utilisées comprennent généralement un corps supérieur et un corps inférieur métalliques, en forme de récipients creux, ouverts à une extrémité, et dont les bords libres respectifs sont appliqués l'un sur l'autre en pinçant entre eux le bord périphérique d'une membrane déformable, par exemple en caoutchouc, l'ensemble étant maintenu ainsi assemblé au moyen de vis traversant des brides formées sur lesdits bords des corps supérieur et inférieur, ou par sertissage si la partie supérieure est en tôle.The diaphragm type petrol pumps currently used generally comprise an upper body and a lower metal body, in the form of hollow containers, open at one end, and the respective free edges of which are applied to one another by pinching between them the peripheral edge of a deformable membrane, for example of rubber, the assembly being kept thus assembled by means of screws passing through flanges formed on said edges of the upper and lower body, or by crimping if the upper part is made of sheet metal.

De façon connue en soi, le corps inférieur est bridé sur le moteur et reçoit un poussoir animé d'un mouvement linéaire alternatif transmis à la membrane soit directement par un excentrique d'un arbre moteur, soit par l'intermédiaire d'un levier basculant. Le corps supérieur comprend un orifice d'aspiration et un orifice de refoulement équipés de façon classique de clapets et éventuellement d'un tamis de filtrage.In a manner known per se, the lower body is clamped on the motor and receives a pusher driven by an alternating linear movement transmitted to the membrane either directly by an eccentric of a motor shaft, or by means of a tilting lever. . The upper body comprises a suction port and a discharge port conventionally fitted with valves and possibly with a filter screen.

Les corps supérieur et inférieur de ces pompes sont généralement réalisés en métal, par exemple en alliage de zinc ou d'aluminium, ou encore en tôle emboutie soudée, mais ces métaux ont un coût de mise en oeuvre relativement élevé, et leur utilisation se traduit naturellement par une augmentation du prix de revient de la pompe. De plus, en raison de leur haute conductivité thermique, ces métaux sont portés rapidement à la température qui règne sous le capot et qui peut parfois s'élever à plus de 100°C, en particulier dès l'arrêt du moteur. Il en résulte une vaporisation de l'essence à l'intérieur de la pompe et par conséquent une difficulté à repartir pour la voiture.The upper and lower bodies of these pumps are generally made of metal, for example of zinc or aluminum alloy, or even of welded stamped sheet metal, but these metals have a relatively high cost of implementation, and their use is reflected naturally by an increase in the cost price of the pump. In addition, because of their high thermal conductivity, these metals are brought quickly to the temperature prevailing under the hood and which can sometimes rise to more than 100 ° C, especially from stopping the engine. This results in vaporization of the gasoline inside the pump and therefore a difficulty in leaving for the car.

En outre, l'utilisation de vis pour solidariser entre eux les deux corps nécessite l'intervention d'une main-d'oeuvre et une majoration supplémentaire du prix de revient de la pompe.In addition, the use of screws to secure the two bodies together requires the intervention of labor and an additional increase in the cost price of the pump.

Par le brevet FR 2 310 480, on connaît une pompe à membrane dépourvue de ces inconvénients, étant donné que le corps supérieur et le corps inférieur sont réalisés en une matière thermoplastique et sont solidarisés au moyen d'une collerette en tôle élastique, qui est sertie sur des brides formées tout le long des bords périphériques des corps.From patent FR 2 310 480, a diaphragm pump is known which does not have these drawbacks, since the upper body and the lower body are made of a thermoplastic material and are joined together by means of an elastic sheet collar, which is crimped on flanges formed all along the peripheral edges of the bodies.

Le corps supérieur d'une telle pompe est formé de deux boîtiers cylindriques, l'un servant de chambre d'aspiration et l'autre de chambre de refoulement et avec lesquels viennent de moulage respectivement une tubulure d'admission et une tubulure de refoulement ayant des directions différentes. Les boîtiers sont indépendants l'un de l'autre et sont interchangeables, de sorte qu'il est possible de réaliser un certain nombre de combinaisons de positions des tubulures d'admission et de refoulement. Mais ce nombre de combinaisons reste limité, de sorte que si l'on veut obtenir une combinaison de positions autre que celles qui sont permises, il est nécessaire de réaliser d'autres moules de boîtiers.The upper body of such a pump is formed by two cylindrical housings, one serving as a suction chamber and the other as a discharge chamber, and with which an intake manifold and a discharge manifold have been molded respectively. different directions. The housings are independent of each other and are interchangeable, so that it is possible to carry out a certain number of combinations of positions of the inlet and outlet pipes. However, this number of combinations remains limited, so that if it is desired to obtain a combination of positions other than those which are permitted, it is necessary to make other molds for housings.

De plus, lorsqu'on intervertit la position des boîtiers, il est nécessaire de modifier la position des clapets. Lors de l'assemblage de la pompe on doit donc veiller soigneusement à ce que les clapets soient disposés dans le bon sens par rapport aux boîtiers. Mais ceci introduit un retard dans le processus d'assemblage de la pompe et des risques d'erreurs de montage.In addition, when reversing the position of the boxes, it is necessary to change the position of the valves. When assembling the pump, care must therefore be taken to ensure that the valves are arranged in the correct direction with respect to the housings. However, this introduces a delay in the pump assembly process and the risk of assembly errors.

La présente invention a pour but de remédier à tous ces inconvénients des pompes connues en proposant une pompe à membrane de structure légère, qui n'est pas sujette au phénomène de vaporisation de l'essence et qui est susceptible d'être fabriquée automatiquement en grande série et donc à un prix relativement bas, en utilisant un unique modèle de moule, la pompe pouvant malgré tout être adaptée à tout type de moteur de voiture.The object of the present invention is to remedy all these drawbacks of known pumps by proposing a diaphragm pump of light structure, which is not subject to the phenomenon of vaporization of petrol and which is capable of being produced automatically on a large scale. series and therefore at a relatively low price, using a single model of mold, the pump can still be adapted to any type of car engine.

A cet effet, l'invention concerne une pompe à membrane, notamment pour l'alimentation en essence d'un moteur de véhicule automobile, du type comprenant un corps supérieur et un corps inférieur cylindriques, ouverts à une extrémité et assemblés par leur bord libre au moyen d'une collerette élastique de sertissage en pinçant entre eux le bord périphérique d'une membrane déformable dont la partie centrale peut être déplacée d'un mouvement alternatif selon l'axe de la pompe, de sorte que l'essence est alternativement aspirée à travers un orifice d'aspiration et un clapet d'aspiration dans une chambre d'aspiration formée dans le corps supérieur, puis refoulée depuis une chambre de refoulement à travers un clapet de refoulement et un orifice de refoulement, caractérisée en ce que le corps supérieur est formé en une seule pièce par moulage d'une matière thermoplastique et est divisé, par une cloison cylindrique tangente intérieurement au corps de manière à définir à l'intérieur, la chambre d'aspiration, et à l'extérieur, la chambre de refoulement, en ce que les clapets d'aspiration et de refoulement sont portés par un porte-clapets sensiblement circulaire, indépendant du corps supérieur et qui est également pincé entre le corps supérieur et le corps inférieur, ledit porte-clapets présentant une portion tubulaire saillante qui vient s'adapter avec étanchéité dans la cloison cylindrique, les clapets d'aspiration et de refoulement étant disposés sur des portions du porte-clapets respectivement en regard de la chambre d'aspiration et de la chambre de refoulement, et en ce que les orifices d'admission et de refoulement sont munis de tubulures soudées sur lesdits orifices dans l'orientation désirée.To this end, the invention relates to a diaphragm pump, in particular for supplying petrol to a motor vehicle engine, of the type comprising an upper body and a cylindrical lower body, open at one end and assembled by their free edge. by means of an elastic crimping collar by pinching between them the peripheral edge of a deformable membrane, the central part of which can be moved in an alternating movement along the axis of the pump, so that the petrol is alternately sucked through a suction port and a suction valve in a suction chamber formed in the upper body, then discharged from a discharge chamber through a discharge valve and a discharge port, characterized in that the body upper is formed in one piece by molding of a thermoplastic material and is divided, by a cylindrical partition tangent internally to the body so as to define inside, the chamber suction, and outside, the discharge chamber, in that the suction and discharge valves are carried by a substantially circular valve holder, independent of the upper body and which is also pinched between the upper body and the body lower, said valve holder having a projecting tubular portion which fits tightly in the cylindrical partition, the suction and discharge valves being arranged on portions of the valve holder respectively opposite the suction chamber and of the discharge chamber, and in that the inlet and outlet ports are fitted with pipes welded to said ports in the desired orientation.

Ainsi, lesdites tubulures sont fabriquées séparément, puis elles sont fixées dans l'orientation voulue au moment de l'assemblage, par exemple par soudure par ultrasons. Le corps supérieur de la pompe peut donc être constitué par une pièce standard de forme immuable, pouvant être utilisé dans tous les types de moteurs. En raison de son élasticité, la collerette permet d'obtenir une liaison élastique permamente entre les deux corps, qui assure un bon écrasement du bord de la membrane et donc une bonne étanchéité. Il est dès lors possible d'automatiser le montage de la pompe, par l'utilisation de robots ou machines automatiques spécialisées.Thus, said tubes are manufactured separately, then they are fixed in the desired orientation at the time of assembly, for example by ultrasonic welding. The upper body of the pump can therefore consist of a standard piece of immutable shape, which can be used in all types of motors. Due to its elasticity, the flange makes it possible to obtain a permanent elastic connection between the two bodies, which ensures good crushing of the edge of the membrane and therefore good sealing. It is therefore possible to automate the assembly of the pump, by using robots or specialized automatic machines.

Deux modes de réalisation préférés de l'invention seront à présent décrits en regard des dessins annexés dans lesquels:

  • La figure 1 est une vue en coupe axiale de la pompe à membrane selon un premier mode de réalisation de l'invention;
  • La figure 2 est une vue de dessus de la pompe de la figure 1;
  • La figure 3 est une vue en plan du corps supérieur, vide des éléments qu'il contient;
  • La figure 4 montre une section radiale de la collerette avant son sertissage, et
  • La figure 5 montre une vue en coupe axiale d'un autre modèle de pompe à membrane commandée par levier basculant.
Two preferred embodiments of the invention will now be described with reference to the accompanying drawings in which:
  • Figure 1 is an axial sectional view of the diaphragm pump according to a first embodiment of the invention;
  • Figure 2 is a top view of the pump of Figure 1;
  • Figure 3 is a plan view of the upper body, empty of the elements it contains;
  • FIG. 4 shows a radial section of the flange before it is crimped, and
  • Figure 5 shows an axial sectional view of another model of diaphragm pump controlled by tilting lever.

Avec référence à la figure 1, la pompe à essence 10 comprend essentiellement un corps supérieur 12 et un corps inférieur 14, tous deux réalisés en une matière thermoplastique de bonne résistance mécanique et ayant une bonne tenue aux températures relativement élevées qui règnent sous le capot de la voiture.With reference to FIG. 1, the fuel pump 10 essentially comprises an upper body 12 and a lower body 14, both made of a thermoplastic material of good mechanical strength and good resistance to the relatively high temperatures prevailing under the hood of the car.

Les corps 12 et 14 sont constitués par des récipients sensiblement cylindriques, ouverts à une extrémité et dont les bords libres respectifs sont appliqués l'un sur l'autre en écrasant entre eux le bord périphérique d'une membrane déformable 16, par exemple en caoutchouc, et le bord périphérique d'un porte-clapets 18 rigide. A cet effet, les deux corps sont solidarisés au moyen d'une collerette annulaire 20 en tôle élastique, qui est sertie sur des brides annulaires 22, 24, formées respectivement sur lesdits bords des corps.The bodies 12 and 14 are constituted by substantially cylindrical containers, open at one end and the respective free edges of which are applied to one another, crushing between them the peripheral edge of a deformable membrane 16, for example made of rubber , and the peripheral edge of a rigid valve holder 18. To this end, the two bodies are secured by means of an annular flange 20 of elastic sheet, which is crimped on annular flanges 22, 24, formed respectively on said edges of the bodies.

Comme le mondre la figure 4, la collerette a initialement une section à trois branches, dont la branche supérieure 26 qui est destinée à s'appliquer contre l'épaulement horizontal 28 de la bride 22 du corps supérieur, est inclinée intérieurement par rapport à l'horizontale d'un faible angle a. Lors du sertissage, cette branche se déforme élastiquement pour s'appliquer sur l'épaulement 28 en exerçant sur les brides 22, 24 et donc sur les bords de la membrane 16 et du porte-clapets 18 un serrage élastique qui garantit une parfaite étanchéité entre les deux corps.Like the world in FIG. 4, the collar initially has a section with three branches, the upper branch 26 of which is intended to be applied against the horizontal shoulder 28 of the flange 22 of the upper body, is inclined internally relative to the horizontal of a small angle a. During crimping, this branch deforms elastically to apply to the shoulder 28 by exerting on the flanges 22, 24 and therefore on the edges of the membrane 16 and of the valve holder 18 an elastic tightening which guarantees a perfect seal between the two bodies.

Le corps supérieur 12 est divisé intérieurement par une cloison sensiblement cyclindrique 30 se raccordant tangentiellement à la paroi du corps 12, en une chambre d'aspiration 32 intérieure à ladite cloison et en une chambre de refoulement 34 extérieure à ladite cloison. La chambre de refoulement comporte intérieurement des cloisons partielles, qui, dessinées d'une manière appropriée, permettent d'isoler des volumes qui jouent le rôle d'amortisseur favorisant les débits.The upper body 12 is divided internally by a substantially cylindrical partition 30 tangentially connecting to the wall of the body 12, in a suction chamber 32 inside said partition and in a discharge chamber 34 outside said partition. The discharge chamber internally has partial partitions, which, drawn in an appropriate manner, make it possible to isolate volumes which act as a damper promoting the flow rates.

Le porte-clapets 18 comprend une portion qui s'adapte dans l'ouverture de la chambre d'aspiration 32, un joint torique 36 assurant l'étanchéité. Ladite portion de porte-clapets ainsi que la portion restante qui se trouve en regard de la chambre de refoulement sont pourvues respectivement d'orifices, obturés de façon connue en soi, par des clapets 38, 40 chargés par des ressorts 41.En amont du clapet 38 d'aspiration est monté un tamis 43 destiné à filtrer l'essence arrivant du réservoir.The valve holder 18 includes a portion which fits into the opening of the suction chamber 32, an O-ring 36 ensuring sealing. Said valve holder portion as well as the remaining portion which is located opposite the delivery chamber are respectively provided with orifices, closed in a manner known per se, by valves 38, 40 loaded by springs 41. suction valve 38 is mounted a screen 43 for filtering the gasoline arriving from the tank.

Le corps supérieur 12 présente, sur sa paroi de fond, deux orifices 42 et 44, qui débouchent respectivement dans la chambre d'aspiration 32 et dans la chambre de refoulement 34.The upper body 12 has, on its bottom wall, two orifices 42 and 44, which open respectively into the suction chamber 32 and into the discharge chamber 34.

Conformément à l'invention, sur ces deux orifices sont respectivement fixées, par exemple par soudure par ultrasons, une tubulure d'aspiration orientable 46 reliée au réservoir d'essence du véhicule et une tubulure de refoulement orientable 48 reliée au carburateur. Comme on l'a déjà précisé, ces tubulures sont soudées au moment de l'assemblage, avec l'orientation souhaitée par l'utilisateur.According to the invention, on these two orifices are respectively fixed, for example by ultrasonic welding, an adjustable suction pipe 46 connected to the vehicle's fuel tank and an adjustable delivery pipe 48 connected to the carburetor. As already specified, these pipes are welded at the time of assembly, with the orientation desired by the user.

Comme le montre la figure 2, le corps supérieur présente également dans sa paroi cylindrique un orifice 50 qui débouche dans la chambre de refoulement et sur lequel est fixée une tubulure 52 destinée à ramener l'essence vers le réservoir en cas d'arrêt de la voiture.As shown in Figure 2, the upper body also has in its cylindrical wall an orifice 50 which opens into the delivery chamber and on which is fixed a tube 52 intended to bring the fuel back to the tank in the event of the car.

La portion centrale de la membrane 16 est enserrée entre un flasque-support et une contre-plaque 56 auxquels elle est solidarisée au moyen d'un rivet 58. Le flasque porte un bras 60 en L relié par une liaison à course libre à l'extrémité supérieure d'un poussoir 62 qui s'étend selon l'axe du corps inférieur 14. Le poussoir fait saillie à l'extérieur du corps inférieur à travers un orifice formé dans le fond de ce dernier, un joint 64 assurant l'étanchéité au niveau de cet orifice.The central portion of the membrane 16 is sandwiched between a support flange and a counter plate 56 to which it is secured by means of a rivet 58. The flange carries an L-shaped arm 60 connected by a free travel link to the upper end of a pusher 62 which extends along the axis of the lower body 14. The pusher projects outside the lower body through an orifice formed in the bottom of the latter, a seal 64 sealing at this orifice.

L'ensemble membrane-flasque et contre-plaque est normalement sollicité vers le haut sur la figure 1 par un ressort de compression 66 s'appuyant sur le flasque 54 et sur le fond du corps inférieur.The membrane-flange and counter-plate assembly is normally biased upwards in FIG. 1 by a compression spring 66 resting on the flange 54 and on the bottom of the lower body.

Le poussoir 62 peut être enfoncé à l'intérieur du corps inférieur, à l'encontre de la force d'un ressort 68 de dureté supérieure à celle du ressort 66. Le poussoir peut être actionné soit par l'excentrique d'un arbre moteur, soit par un levier basculant.The pusher 62 can be pressed inside the lower body, against the force of a spring 68 of greater hardness than that of the spring 66. The pusher can be actuated either by the eccentric of a motor shaft , or by a tilting lever.

Initialement, la pompe est dans l'état représenté sur la figure 1 : le poussoir 62 est amené dans sa position basse par le ressort de rappel 68 ; la butée 70 du poussoir s'appuyant sur le bras 60 fait descendre l'ensemble de la membrane 16, du flasque-support 54 et de la contre-plaque 56. Lorsque la came enfonce le poussoir, ledit ensemble mobile étant libéré, il est repoussé vers le haut sur la figure 1 par le ressort précontraint 66. Dans ce mouvement, l'essence qui se trouve dans la chambre 72 définie entre la membrane 16 et le porte-clapets 18 est refoulée à travers le clapet 40 et la tubulure de refoulement 48 vers le carburateur.Initially, the pump is in the state shown in FIG. 1: the pusher 62 is brought into its low position by the return spring 68; the stop 70 of the pusher resting on the arm 60 lowers the assembly of the membrane 16, of the support flange 54 and of the counterplate 56. When the cam pushes the pusher, said movable assembly being released, it is pushed upwards in FIG. 1 by the prestressed spring 66. In this movement, the gasoline which is in the chamber 72 defined between the membrane 16 and the valve holder 18 is discharged through the valve 40 and the manifold. discharge 48 to the carburetor.

Lorsque la came s'efface, le poussoir 62 est rappelé par le ressort 68 vers sa position basse. Le poussoir fait alors descendre la membrane, de sorte que de l'essence est aspirée depuis le réservoir à travers la tubulure d'aspiration 46, le tamis 43 et le clapet 38. Le cycle se reproduit de la même façon à chaque révolution de la came.When the cam disappears, the pusher 62 is returned by the spring 68 to its low position. The pusher then lowers the membrane, so that gasoline is sucked from the tank through the suction pipe 46, the screen 43 and the valve 38. The cycle is repeated in the same way with each revolution of the cam.

En raison de ses nombreuses qualités signalées précédemment, la pompe selon l'invention est bien plus performante, plus légère, plus économique que les meilleures pompes à membrane actuellement connues sur le marché. De plus, elle peut être fabriquée de façon entièrement automatique en grande série, puisqu'il ne faut en fabriquer qu'un unique modèle, les tubulures étant soudées au moment de l'assemblage, avec l'orientation voulue.Because of its many qualities mentioned above, the pump according to the invention is much more efficient, more lightweight, more economical than the best diaphragm pumps currently known on the market. In addition, it can be manufactured fully automatically in large series, since it only requires one model, the pipes being welded at the time of assembly, with the desired orientation.

La pompe représentée sur la figure 5 ne se distingue de celle de la figure 1 que par le fait que le poussoir 62 est directement fixé à l'ensemble membrane 16, flasque 54 et contre-plaque 56 et que le poussoir est actionné par un levier basculant 76. Ce dernier est monté pivotant autour d'un axe 78 et est sollicité en appui contre une came 80 d'un arbre moteur par un ressort 82.The pump shown in FIG. 5 differs from that of FIG. 1 only in that the pusher 62 is directly fixed to the membrane 16, flange 54 and counter plate 56 assembly and that the pusher is actuated by a lever. tilting 76. The latter is pivotally mounted about an axis 78 and is urged to bear against a cam 80 of a drive shaft by a spring 82.

Claims (3)

1. Pompe à membrane, notamment pour l'alimentation en essence d'un moteur de véhicule automobile, du type comprenant un corps supérieur (12) et un corps inférieur (14) cylindriques, ouverts à une extrémité et assemblés par leur bord libre au moyen d'une collerette élastique (20) de sertissage en pinçant entre eux le bord périphérique d'une membrane déformable (16) dont la partie centrale peut être déplacée d'un mouvement alternatif selon l'axe de la pompe, de sorte que l'essence est alternativement aspirée à travers un orifice d'aspiration (42) et un clapet d'aspiration (38) dans une chambre d'aspiration (32) formée dans le corps supérieur, puis refoulée depuis une chambre de refoulement (34) à travers un clapet de refoulement (40) et un orifice de refoulement (44), caractérisée en ce que le corps supérieur (12) est formé en une seule pièce par moulage d'une matière thermoplastique et est divisé, par une cloison cylindrique (30) tangente intérieurement au corps de manière à définir à l'intérieur, la chambre d'aspiration, et à l'extérieur, la chambre de refoulement, en ce_que les clapets d'aspiration (38) et de refoulement (40) sont portés par un porte-clapets (18) sensiblement circulaire, indépendant du corps supérieur (12) et qui est également pincé entre le corps supérieur et le corps inférieur, ledit porte-clapets présentant une portion tubulaire saillante qui vient s'adapter avec étanchéité dans la cloison cylindrique, les clapets d'aspiration et de refoulement étant disposés sur des portions du porte-clapets respectivement en regard de la chambre d'aspiration et de la chambre de refoulement, et en ce que les orifices d'admission (42) et de refoulement (44) sont munis de tubulures (46, 48) soudées sur lesdits orifices dans l'orientation désirée.1. Diaphragm pump, in particular for supplying petrol to a motor vehicle engine, of the type comprising a cylindrical upper body (12) and a cylindrical lower body (14), open at one end and joined by their free edge to the by means of an elastic flange (20) for crimping by pinching between them the peripheral edge of a deformable membrane (16), the central part of which can be moved in an alternating movement along the axis of the pump, so that the gasoline is alternately sucked through a suction port (42) and a suction valve (38) in a suction chamber (32) formed in the upper body, then discharged from a discharge chamber (34) to through a discharge valve (40) and a discharge opening (44), characterized in that the upper body (12) is formed in one piece by molding from a thermoplastic material and is divided by a cylindrical partition (30 ) tangent internally to the body so as to define inside, the suction chamber, and outside, the discharge chamber, in that the suction (38) and discharge (40) valves are carried by a substantially circular, independent valve holder (18) of the upper body (12) and which is also pinched between the upper body and the lower body, said valve holder having a projecting tubular portion which fits tightly in the cylindrical wall, the suction and discharge valves being arranged on portions of the valve holder respectively opposite the suction chamber and the discharge chamber, and in that the inlet (42) and discharge (44) orifices are provided with pipes (46, 48 ) welded to said orifices in the desired orientation. 2. Pompe à membrane selon la revendication 1, caractérisée en ce que le corps supérieur (12) comporte à son bord libre une bride (22) qui présente du côté intérieur un épaulement périphérique dans lequel vient se loger sans surépaisseur le bord périphérique du porte-clapets.2. Diaphragm pump according to claim 1, characterized in that the upper body (12) has at its free edge a flange (22) which has on the inner side a peripheral shoulder in which is housed without additional thickness the peripheral edge of the valve holder. 3. Procédé d'assemblage de la pompe selon l'une des revendications 1 et 2, caractérisé en ce que lesdites tubulures (46, 48) sont fabriquées séparément, puis soudées dans les orifices d'admission (42) et de refoulement (44) avec l'orientation souhaitée, par exemple par soudure par ultrasons.3. A method of assembling the pump according to one of claims 1 and 2, characterized in that said pipes (46, 48) are manufactured separately, then welded into the inlet (42) and discharge (44) ports. ) with the desired orientation, for example by ultrasonic welding.
EP84402717A 1983-12-28 1984-12-26 Membrane pump for the fuel supply of a vehicle engine. Expired EP0147330B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320928 1983-12-28
FR8320928A FR2557639B1 (en) 1983-12-28 1983-12-28 MEMBRANE PUMP FOR FUELING A MOTOR VEHICLE ENGINE AND ASSEMBLY METHOD THEREOF

Publications (2)

Publication Number Publication Date
EP0147330A1 true EP0147330A1 (en) 1985-07-03
EP0147330B1 EP0147330B1 (en) 1988-08-17

Family

ID=9295652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402717A Expired EP0147330B1 (en) 1983-12-28 1984-12-26 Membrane pump for the fuel supply of a vehicle engine.

Country Status (5)

Country Link
EP (1) EP0147330B1 (en)
DE (1) DE3473493D1 (en)
ES (1) ES8605614A1 (en)
FR (1) FR2557639B1 (en)
PT (1) PT79753A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821153A1 (en) * 1996-02-14 1998-01-28 Mikuni Adec Corporation Diaphragm-holding synthetic resin assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2623253B1 (en) * 1987-11-13 1990-04-13 Hunsinger Emile FUEL SUPPLY PUMP FOR A HEAT ENGINE AND MANUFACTURING METHOD THEREOF
DE3765412D1 (en) * 1986-12-16 1990-11-08 Emile Hunsinger DIAPHRAGM PUMP FOR THE FUEL SUPPLY OF A THERMAL MACHINE AND METHOD FOR THE PRODUCTION THEREOF.
FR2608218B1 (en) * 1986-12-16 1989-04-07 Hunsinger Emile MEMBRANE PUMP FOR FUELING A MOTOR VEHICLE ENGINE AND MANUFACTURING METHOD THEREOF
FR2722539B1 (en) 1994-07-12 1996-08-23 Rivapompe Sa MECHANICAL PUMP WITH INCREASED PRESSURE MEMBRANE FOR FUEL SUPPLY OF THERMAL ENGINES, IN PARTICULAR OF INJECTION ENGINE
KR101605718B1 (en) * 2014-07-31 2016-03-24 세메스 주식회사 Liquid supplying unit and Apparatus for treating substrate with the unit

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US3179055A (en) * 1962-08-31 1965-04-20 Acf Ind Inc Fuel pump
US3491700A (en) * 1967-03-21 1970-01-27 Airtex Prod Fuel pump
FR2118548A5 (en) * 1970-12-17 1972-07-28 Fispa Spa
FR2310480A1 (en) * 1975-05-05 1976-12-03 Gen Motors France MEMBRANE PUMP
US4153394A (en) * 1977-02-28 1979-05-08 Kyosan Denki Kabushiki Kaisha Fuel pump
FR2417023A1 (en) * 1978-02-09 1979-09-07 Iao Industrie Riunite Spa FUEL SUPPLY DIAPHRAGM PUMP, ESPECIALLY FOR INTERNAL COMBUSTION ENGINE
FR2425555A1 (en) * 1978-05-08 1979-12-07 Pn Sas Negro Et Co Membrane fuel pump for IC engine - has inlet and discharge chambers forming air pockets to reduce pressure fluctuations
WO1981000891A1 (en) * 1979-10-01 1981-04-02 Acf Ind Inc Crashworthy fuel pump
FR2512888A1 (en) * 1981-06-09 1983-03-18 Siette Spa Automobile brake servo pump and oil pump - are assembled with common drive mechanism using crank shaft and rocker
FR2528116A1 (en) * 1982-06-08 1983-12-09 Siette DIAPHRAGM PUMP FOR SUPPLYING FUEL TO AN INTERNAL COMBUSTION ENGINE

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FR1121507A (en) * 1952-10-29 1956-08-20 Carter Carburetor Corp Fuel pump
US3252424A (en) * 1960-01-15 1966-05-24 Acf Ind Inc Fuel systems
US3198128A (en) * 1961-07-05 1965-08-03 Acf Ind Inc Mechanical pump

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179055A (en) * 1962-08-31 1965-04-20 Acf Ind Inc Fuel pump
US3491700A (en) * 1967-03-21 1970-01-27 Airtex Prod Fuel pump
FR2118548A5 (en) * 1970-12-17 1972-07-28 Fispa Spa
FR2310480A1 (en) * 1975-05-05 1976-12-03 Gen Motors France MEMBRANE PUMP
US4153394A (en) * 1977-02-28 1979-05-08 Kyosan Denki Kabushiki Kaisha Fuel pump
FR2417023A1 (en) * 1978-02-09 1979-09-07 Iao Industrie Riunite Spa FUEL SUPPLY DIAPHRAGM PUMP, ESPECIALLY FOR INTERNAL COMBUSTION ENGINE
FR2425555A1 (en) * 1978-05-08 1979-12-07 Pn Sas Negro Et Co Membrane fuel pump for IC engine - has inlet and discharge chambers forming air pockets to reduce pressure fluctuations
WO1981000891A1 (en) * 1979-10-01 1981-04-02 Acf Ind Inc Crashworthy fuel pump
FR2512888A1 (en) * 1981-06-09 1983-03-18 Siette Spa Automobile brake servo pump and oil pump - are assembled with common drive mechanism using crank shaft and rocker
FR2528116A1 (en) * 1982-06-08 1983-12-09 Siette DIAPHRAGM PUMP FOR SUPPLYING FUEL TO AN INTERNAL COMBUSTION ENGINE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821153A1 (en) * 1996-02-14 1998-01-28 Mikuni Adec Corporation Diaphragm-holding synthetic resin assembly
EP0821153A4 (en) * 1996-02-14 1999-04-14 Mikuni Adec Corp Diaphragm-holding synthetic resin assembly

Also Published As

Publication number Publication date
ES8605614A1 (en) 1986-03-16
FR2557639A1 (en) 1985-07-05
EP0147330B1 (en) 1988-08-17
ES539094A0 (en) 1986-03-16
FR2557639B1 (en) 1988-06-24
DE3473493D1 (en) 1988-09-22
PT79753A (en) 1985-01-01

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