EP1389684B1 - Multi layer priming pump - Google Patents

Multi layer priming pump Download PDF

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Publication number
EP1389684B1
EP1389684B1 EP03291743A EP03291743A EP1389684B1 EP 1389684 B1 EP1389684 B1 EP 1389684B1 EP 03291743 A EP03291743 A EP 03291743A EP 03291743 A EP03291743 A EP 03291743A EP 1389684 B1 EP1389684 B1 EP 1389684B1
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EP
European Patent Office
Prior art keywords
priming pump
inner layer
layer
envelope
polyamide
Prior art date
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.)
Expired - Lifetime
Application number
EP03291743A
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German (de)
French (fr)
Other versions
EP1389684A1 (en
Inventor
Nathalie Proust
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nobel Plastiques SA
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Nobel Plastiques SA
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Filing date
Publication date
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Priority to SI200331475T priority Critical patent/SI1389684T1/en
Publication of EP1389684A1 publication Critical patent/EP1389684A1/en
Application granted granted Critical
Publication of EP1389684B1 publication Critical patent/EP1389684B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • 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
    • F02M37/16—Feeding by means of driven pumps characterised by provision of personally-, e.g. manually-, operated pumps

Definitions

  • the invention relates to a priming pump intended in particular to equip a fuel supply circuit of a motor vehicle.
  • Priming pumps made of elastomer and having an envelope with an elastically deformable central zone between a state of rest in which the envelope has a maximum volume and a pressed state are known.
  • the envelope comprises connection zones at the inlet and at the outlet of the central zone which comprise directional valves arranged to allow the passage of the fluid in a given direction as the pressures exerted on the envelope.
  • the new motor engines (including diesel engines with common injection rail) have the particularity of working at a high average temperature, the fuel can for example be increased to 125 ° Celsius continuously or 150 ° Celsius peak.
  • the priming pumps can be mounted in parallel with the injection pump on the supply circuit and no longer in series with it, so that that the inside of the priming pump is no longer swept by the fuel flow but on the contrary contains stagnant fuel.
  • the additives contained in the new fuels provided for this type of engine are particularly corrosive to the material of the envelope, especially at high temperature.
  • the stagnant fuel infiltrates naturally into the pores of the shell material, which tends to wash the latter of the loads included in the material which give it elasticity.
  • Document is known US 2,954,048 a single layer elastomer pump.
  • the document US 3,987,775 describes a pump with two independent concentric envelopes, the outer envelope being more rigid, and the inner flexible envelope.
  • the invention aims to provide a priming pump does not have the aforementioned drawbacks.
  • a multilayer priming pump with an envelope comprising an elastic outer layer of elastomeric material and an inner layer forming a barrier for the fluid present inside the pump.
  • the inner layer prevents the fuel from entering or chemically reacting with the elastomer of the outer layer.
  • the latter can be made of a current type elastomer, which, subject only to temperature variations, is able to keep its elastic properties over time.
  • the casing thus obtained is certainly more expensive than a monolayer elastomer casing current, but still remains at a much lower cost than a monolayer envelope fluoroelastomer. In addition, its recycling is easier.
  • a priming pump casing comprises in known manner a central zone 1 of large diameter and deformable by hand, the central zone being associated with connecting zones 2 which extend from one side to another. other of this and which contain directional valves (not shown).
  • the casing of the priming pump is multilayer and comprises an outer layer 3 and an inner layer 4.
  • the outer layer 3 is here made of elastomer of the current type, preferably a thermoplastic based on polyether ester (TPEE), which makes it possible to give the central zone 1 of the envelope a good elasticity and which is resistant to variations high temperatures.
  • TPEE polyether ester
  • an intermediate bonding layer may be provided between the outer layer 3 and the inner layer 4 to ensure good adhesion of the two layers together.
  • the materials recommended according to the invention for the inner layer 4 are generally less elastic than the material used for the outer layer 3, so that the thicknesses of the layers are likely to affect the elasticity of the priming pump.
  • the central zone 1 of the envelope has a diameter of 40 mm, the minimum thicknesses of the inner and outer layers being 0.3 mm and 0.55 mm respectively, while the connecting zones 2 have a diameter of 21 mm and the minimum thicknesses of the inner and outer layers are 0.55 mm and 0.85 mm respectively.
  • the inner layer has a local relative thickness of between 30% and 40% of the total local thickness of the envelope.
  • This range of relative thickness makes it possible to preserve a satisfactory elasticity of the envelope.
  • Such priming pumps can be obtained by coextrusion of the constituent layers of the pumps to form a multilayer tube, then forming the tube (for example by means of a mobile mold device placed at the extruder outlet) in a series of pumps. of priming, that it is enough then to debit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Laminated Bodies (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Rotary Pumps (AREA)
  • External Artificial Organs (AREA)

Abstract

The priming pump consists of an envelope with an elastically deformable central zone (1) linked to two connecting zones (2) and comprising an outer layer (3) of an elastomer and an inner layer (4) that forms a barrier for the fluid inside the pump. The envelope can also have an intermediate layer connecting the outer and inner layers. The outer layer is between 0.1 and 2 mm thick, while the inner layer is 0.1 - 1 mm thick.

Description

L'invention concerne une pompe d'amorçage notamment destinée à équiper un circuit d'alimentation en carburant d'un véhicule automobile.The invention relates to a priming pump intended in particular to equip a fuel supply circuit of a motor vehicle.

ARRIÈRE-PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

On connaît des pompes d'amorçage réalisées en élastomère et présentant une enveloppe avec une zone centrale élastiquement déformable entre un état de repos dans laquelle l'enveloppe a un volume maximal et un état pressé. L'enveloppe comporte des zones de raccord en entrée et en sortie de la zone centrale qui comportent des clapets directionnels agencés pour permettre le passage du fluide dans un sens déterminé au fur et à mesure des pressions exercées sur l'enveloppe.Priming pumps made of elastomer and having an envelope with an elastically deformable central zone between a state of rest in which the envelope has a maximum volume and a pressed state are known. The envelope comprises connection zones at the inlet and at the outlet of the central zone which comprise directional valves arranged to allow the passage of the fluid in a given direction as the pressures exerted on the envelope.

Les nouveaux moteurs automobiles (notamment les moteurs diesel à rampe d'injection commune) ont pour particularité de travailler à une température moyenne importante, le carburant pouvant par exemple être porté à 125° Celsius en continu, voire 150° Celsius en pointe.The new motor engines (including diesel engines with common injection rail) have the particularity of working at a high average temperature, the fuel can for example be increased to 125 ° Celsius continuously or 150 ° Celsius peak.

Par ailleurs, dans les circuits d'alimentation prévus pour ce type de moteur, les pompes d'amorçage peuvent être montées en dérivation de la pompe d'injection sur le circuit d'alimentation et non plus en série avec celle-ci, de sorte que l'intérieur de la pompe d'amorçage n'est plus balayé par le flux de carburant mais au contraire contient du carburant stagnant.Moreover, in the supply circuits provided for this type of motor, the priming pumps can be mounted in parallel with the injection pump on the supply circuit and no longer in series with it, so that that the inside of the priming pump is no longer swept by the fuel flow but on the contrary contains stagnant fuel.

On a constaté que dans de telles conditions, les matériaux actuellement utilisés pour la réalisation des enveloppes ont tendance à vieillir prématurément, pour diverses raisons.It has been found that under such conditions the materials currently used for making the wraps tend to age prematurely for various reasons.

D'une part, à l'amplitude importante des variations de température s'ajoute l'acidité qu'acquiert le carburant aux températures élevées, ce qui, combiné, provoque une dégradation prématurée de l'enveloppe.On the one hand, to the large amplitude of temperature variations is added the acidity acquired by the fuel at high temperatures, which, combined, causes premature degradation of the envelope.

D'autre part, les additifs contenus dans les nouveaux carburants prévus pour ce type de moteurs sont particulièrement corrosifs pour le matériau de l'enveloppe, surtout à haute température.On the other hand, the additives contained in the new fuels provided for this type of engine are particularly corrosive to the material of the envelope, especially at high temperature.

En outre, le carburant stagnant s'infiltre naturellement dans les pores du matériau de l'enveloppe, ce qui tend à laver celui-ci des charges incluses dans le matériau qui lui confèrent son élasticité.In addition, the stagnant fuel infiltrates naturally into the pores of the shell material, which tends to wash the latter of the loads included in the material which give it elasticity.

Pour réaliser une enveloppe de pompe d'amorçage répondant à de telles contraintes, on a songé à utiliser un matériau de type fluoroélastomère, qui résiste aux agressions à la fois chimiques et thermiques et garde son élasticité dans le temps. Mais outre que ce matériau est bien trop onéreux pour envisager son utilisation dans le cadre d'une production de masse, il se révèle peu recyclable.In order to produce a priming pump casing meeting such constraints, it has been proposed to use a fluoroelastomer-type material, which resists both chemical and thermal aggression and retains its elasticity over time. But besides this material is too expensive to consider its use as part of a mass production, it is not very recyclable.

On connaît du document US 2 954 048 une pompe monocouche en élastomère. Le document US 3 987 775 décrit une pompe à deux enveloppes concentriques indépendantes, l'enveloppe externe étant plus rigide, et l'enveloppe interne souple.Document is known US 2,954,048 a single layer elastomer pump. The document US 3,987,775 describes a pump with two independent concentric envelopes, the outer envelope being more rigid, and the inner flexible envelope.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour objet de proposer une pompe d'amorçage ne présentant pas les inconvénients précités.The invention aims to provide a priming pump does not have the aforementioned drawbacks.

BREVET DESCRIPTION DE L'INVENTIONPATENT DESCRIPTION OF THE INVENTION

Selon l'invention, on propose une pompe d'amorçage multicouche avec une enveloppe comprenant une couche externe élastique en matériau élastomère et une couche interne formant barrière pour le fluide présent à l'intérieur de la pompe.According to the invention, there is provided a multilayer priming pump with an envelope comprising an elastic outer layer of elastomeric material and an inner layer forming a barrier for the fluid present inside the pump.

La couche interne empêche le carburant de pénétrer dans l'élastomère de la couche externe ou de réagir chimiquement avec celui-ci.The inner layer prevents the fuel from entering or chemically reacting with the elastomer of the outer layer.

Dès lors, cette dernière peut être réalisée en un élastomère de type courant, qui, soumis uniquement aux variations de température, est capable de garder ses propriétés élastiques dans le temps.Therefore, the latter can be made of a current type elastomer, which, subject only to temperature variations, is able to keep its elastic properties over time.

L'enveloppe ainsi obtenue est certes plus onéreuse qu'une enveloppe monocouche en élastomère courant, mais reste néanmoins d'un coût bien plus faible qu'une enveloppe monocouche en fluoroélastomère. De plus, son recyclage est plus aisé.The casing thus obtained is certainly more expensive than a monolayer elastomer casing current, but still remains at a much lower cost than a monolayer envelope fluoroelastomer. In addition, its recycling is easier.

BREVE DESCRIPTION DU DESSINBRIEF DESCRIPTION OF THE DRAWING

D'autres caractéristiques et avantages de l'invention ressortiront à la lumière de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention, en référence à l'unique figure annexée qui représente une enveloppe de pompe d'amorçage selon l'invention en coupe longitudinale.Other characteristics and advantages of the invention will emerge in the light of the following description of a particular non-limiting embodiment of the invention, with reference to the single appended figure which represents a priming pump casing. according to the invention in longitudinal section.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence à la figure, une enveloppe de pompe d'amorçage comporte de façon connue en soi une zone centrale 1 de grand diamètre et déformable à la main, la zone centrale étant associée à des zones de raccord 2 qui s'étendent de part et d'autre de celle-ci et qui contiennent des clapets directionnels (non représentés).Referring to the figure, a priming pump casing comprises in known manner a central zone 1 of large diameter and deformable by hand, the central zone being associated with connecting zones 2 which extend from one side to another. other of this and which contain directional valves (not shown).

Selon l'invention, l'enveloppe de la pompe d'amorçage est multicouche et comprend une couche externe 3 et une couche interne 4.According to the invention, the casing of the priming pump is multilayer and comprises an outer layer 3 and an inner layer 4.

La couche externe 3 est ici réalisée en élastomère de type courant, de préférence un thermoplastique à base d'ester de polyether (TPEE), qui permet de conférer à la zone centrale 1 de l'enveloppe une bonne élasticité et qui résiste à des variations de températures importantes.The outer layer 3 is here made of elastomer of the current type, preferably a thermoplastic based on polyether ester (TPEE), which makes it possible to give the central zone 1 of the envelope a good elasticity and which is resistant to variations high temperatures.

La couche interne 4 sera quant à elle réalisée de préférence dans les matériaux suivants :

  • polyamide (PA) ;
  • polyphénylène de sulfone (PPS)
  • mélange de sulfone de polyphénylène (PPS) et de polyamide (PA) ;
  • mélange de polyamide (PA) et de polyoléfine (PO);
  • téréphtalate de polybutylène (PBT).
The inner layer 4 will preferably be made of the following materials:
  • polyamide (PA);
  • Polyphenylene sulfone (PPS)
  • polyphenylene sulfone (PPS) and polyamide (PA) blend;
  • mixture of polyamide (PA) and polyolefin (PO);
  • polybutylene terephthalate (PBT).

Ces matériaux forment des barrières efficaces pour une grande variété de carburants, comme les carburants à base d'hydrocarbure ou encore à base d'alcool ou d'ester.These materials form effective barriers for a wide variety of fuels, such as hydrocarbon-based or alcohol-based fuels. ester.

Le cas échéant, une couche intermédiaire de liaison pourra être prévue entre la couche externe 3 et la couche interne 4 afin d'assurer une bonne adhésion des deux couches entre elles.Where appropriate, an intermediate bonding layer may be provided between the outer layer 3 and the inner layer 4 to ensure good adhesion of the two layers together.

Les matériaux préconisés selon l'invention pour la couche interne 4 sont en général moins élastiques que le matériau utilisé pour la couche externe 3, de sorte que les épaisseurs des couches sont susceptibles d'influer sur l'élasticité de la pompe d'amorçage.The materials recommended according to the invention for the inner layer 4 are generally less elastic than the material used for the outer layer 3, so that the thicknesses of the layers are likely to affect the elasticity of the priming pump.

Dans l'exemple de réalisation illustré, la zone centrale 1 de l'enveloppe a un diamètre de 40 mm, les épaisseurs minimales des couches interne et externe étant de 0,3 mm et 0,55 mm respectivement, tandis que les zones de raccord 2 ont un diamètre de 21 mm et les épaisseurs minimales des couches interne et externe sont de 0,55 mm et 0,85 mm respectivement.In the exemplary embodiment illustrated, the central zone 1 of the envelope has a diameter of 40 mm, the minimum thicknesses of the inner and outer layers being 0.3 mm and 0.55 mm respectively, while the connecting zones 2 have a diameter of 21 mm and the minimum thicknesses of the inner and outer layers are 0.55 mm and 0.85 mm respectively.

De nombreux essais ont été menés, qui ont conduit à retenir les géométries suivantes :

  • épaisseur de la couche interne : 0,1 à 1 mm
  • épaisseur de la couche externe : 0,1 à 2 mm
Many tests were conducted, which led to the following geometries:
  • thickness of the inner layer: 0.1 to 1 mm
  • thickness of the outer layer: 0.1 to 2 mm

De préférence, la couche interne a une épaisseur relative locale comprise entre 30 % et 40 % de l'épaisseur totale locale de l'enveloppe.Preferably, the inner layer has a local relative thickness of between 30% and 40% of the total local thickness of the envelope.

Cette plage d'épaisseur relative permet de préserver une élasticité satisfaisante de l'enveloppe.This range of relative thickness makes it possible to preserve a satisfactory elasticity of the envelope.

De telles pompes d'amorçage peuvent être obtenues par coextrusion des couches constitutives des pompes pour former un tube multicouche, puis formage du tube (par exemple au moyen d'un dispositif à moules mobiles placé en sortie d'extrudeuse) en un chapelet de pompes d'amorçage, qu'il suffit alors de débiter.Such priming pumps can be obtained by coextrusion of the constituent layers of the pumps to form a multilayer tube, then forming the tube (for example by means of a mobile mold device placed at the extruder outlet) in a series of pumps. of priming, that it is enough then to debit.

Claims (6)

  1. A priming pump comprising an enclosure having an elastically deformable central zone (1) connected to two coupling zones (2), the pump being characterized in that the enclosure comprises an outer layer (3) of elastomer material and an inner layer (4) of material forming a barrier against the fluid present inside the pump.
  2. A priming pump according to claim 1, characterized in that the enclosure further comprises an intermediate bonding layer between the outer layer (3) and the inner layer (4).
  3. A priming pump according to claim 1, characterized in that the inner layer (4) is made out of one of the following materials:
    - polyamide;
    - polyphenylene sulfone;
    - a mixture of polyphenylene sulfone and polyamide;
    - a mixture of polyamide and polyolefin; and
    - polybutylene terephthalate.
  4. A priming pump according to claim 1, characterized in that the inner layer (4) is of thickness lying in the range 0.1 mm to 1 mm.
  5. A priming pump according to claim 1, characterized in that the outer layer (3) is of thickness lying in the range 0.1 mm to 2 mm.
  6. A priming pump according to claim 1, characterized in that the inner layer (4) is of local relative thickness lying in the range 30% to 40% of the total local thickness of the enclosure.
EP03291743A 2002-08-13 2003-07-15 Multi layer priming pump Expired - Lifetime EP1389684B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331475T SI1389684T1 (en) 2002-08-13 2003-07-15 Multi layer priming pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0210265A FR2843619B1 (en) 2002-08-13 2002-08-13 MULTILAYER PRIMING PUMP
FR0210265 2002-08-13

Publications (2)

Publication Number Publication Date
EP1389684A1 EP1389684A1 (en) 2004-02-18
EP1389684B1 true EP1389684B1 (en) 2008-09-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03291743A Expired - Lifetime EP1389684B1 (en) 2002-08-13 2003-07-15 Multi layer priming pump

Country Status (12)

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US (1) US7021195B2 (en)
EP (1) EP1389684B1 (en)
JP (1) JP2004076729A (en)
AT (1) ATE409284T1 (en)
BR (1) BR0302754A (en)
DE (1) DE60323714D1 (en)
ES (1) ES2314166T3 (en)
FR (1) FR2843619B1 (en)
MX (1) MXPA03007057A (en)
PL (1) PL361511A1 (en)
RU (1) RU2277184C2 (en)
SI (1) SI1389684T1 (en)

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US8631777B2 (en) 2008-02-08 2014-01-21 Bluskies International Llc Rigid primer bulb pump
US8069830B2 (en) * 2008-02-08 2011-12-06 Christopher Brown Rigid primer bulb pump
FR2941500B1 (en) * 2009-01-29 2011-07-15 Peugeot Citroen Automobiles Sa MANUAL PRIMING PUMP OF A FUEL SUPPLY CIRCUIT OF A COMBUSTION ENGINE
FR2948731B1 (en) 2009-07-29 2014-05-09 Peugeot Citroen Automobiles Sa DEVICE AND METHOD FOR STARTING A FUEL CIRCUIT OF A COMBUSTION ENGINE
US8403654B2 (en) * 2010-03-31 2013-03-26 Rl Hudson & Company Low fuel permeation primer bulb
US20120070325A1 (en) * 2010-09-17 2012-03-22 Wireman Justin Mccord Multi-layer primer apparatus and methods
CN102452088B (en) 2010-10-28 2015-07-01 吉列公司 Hair removing device with blade holder holding covering part
CN102452095B (en) 2010-10-28 2014-10-29 吉列公司 Applicator of hair removing device for distributing liquid
CN102452091B (en) 2010-10-28 2015-08-12 吉列公司 For the application device with deflector of hair removal device
CN102452094A (en) 2010-10-28 2012-05-16 吉列公司 Hair removing kit for distributing liquid
CN102452085B (en) 2010-10-28 2016-01-27 吉列公司 For the pump of the hair removal device of dispense liquid
CN102452092B (en) 2010-10-28 2015-04-01 吉列公司 Hair removing device for dispensing liquid
US9156175B2 (en) 2011-12-09 2015-10-13 The Gillette Company Fluid applicator for a personal-care appliance
CN102410116A (en) * 2011-12-19 2012-04-11 芜湖盛力制动有限责任公司 Manual fuel delivery pump for diesel engine fuel system of commercial vehicle
CN113565659A (en) * 2021-07-20 2021-10-29 河北华北柴油机有限责任公司 Reliability assessment method for manual fuel pump

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Publication number Publication date
ATE409284T1 (en) 2008-10-15
FR2843619A1 (en) 2004-02-20
JP2004076729A (en) 2004-03-11
US20040033143A1 (en) 2004-02-19
ES2314166T3 (en) 2009-03-16
BR0302754A (en) 2004-08-24
MXPA03007057A (en) 2004-10-15
EP1389684A1 (en) 2004-02-18
FR2843619B1 (en) 2006-01-06
DE60323714D1 (en) 2008-11-06
SI1389684T1 (en) 2009-04-30
RU2277184C2 (en) 2006-05-27
PL361511A1 (en) 2004-02-23
US7021195B2 (en) 2006-04-04
RU2003125140A (en) 2005-02-27

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