EP0953764B1 - Pompe volumétrique - Google Patents

Pompe volumétrique Download PDF

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Publication number
EP0953764B1
EP0953764B1 EP99107763A EP99107763A EP0953764B1 EP 0953764 B1 EP0953764 B1 EP 0953764B1 EP 99107763 A EP99107763 A EP 99107763A EP 99107763 A EP99107763 A EP 99107763A EP 0953764 B1 EP0953764 B1 EP 0953764B1
Authority
EP
European Patent Office
Prior art keywords
piston
duct
volumetric pump
valve
seat
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
EP99107763A
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German (de)
English (en)
Other versions
EP0953764A1 (fr
Inventor
Javier Duaso
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli Powertrain SpA
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Filing date
Publication date
Application filed by Magneti Marelli Powertrain SpA filed Critical Magneti Marelli Powertrain SpA
Publication of EP0953764A1 publication Critical patent/EP0953764A1/fr
Application granted granted Critical
Publication of EP0953764B1 publication Critical patent/EP0953764B1/fr
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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0223—Electromagnetic pumps

Definitions

  • the present invention relates to a volumetric pump.
  • the present invention relates to a volumetric pump designed to ensure the circulation of lubricating oil in a two-stroke internal combustion engine of known type; the use to which the details as follow make explicit reference without loss of their general nature thereby.
  • such pumps generally comprise a valve-like body of essentially cylindrical form, and a ferromagnetic material piston installed to slide axially within a cylindrical seat formed in the valve-like body.
  • the two axial ends of the cylindrical seat are in communication with atmosphere by way of two connecting ducts which extend inside the valve-like body, coaxially with the longitudinal axis of the valve-like body; while the two variable-volume chambers in which the piston subdivides the cylindrical seat, are in communication together through an axial duct formed in the body of the piston.
  • the electromagnetically-actuated volumetric pumps also comprise an opposition spring, which is located inside one of the two variable-volume chambers of which the piston subdivides the cylindrical seat, in such a manner as to minimise the volume of the chamber not occupied by the spring; and a coil of electrically conductor material, which when an electrical current passes through, is able to generate a magnetic field able to oppose the force of the opposing spring, and to axially move the piston in such a way as to maximise the volume of the variable-volume chamber not containing the spring.
  • the said chamber defines the pumping chamber of the volumetric pump.
  • the aforementioned electromagnetically-actuated volumetric pumps are finally provided with an intake valve located along the axial duct formed in the body of the piston, and with a supply valve located along the duct which connects the pumping chamber, or the variable-volume chamber not containing the opposition spring, directly to atmosphere.
  • CH-675312 and FR-2465903 teach the use an intake valve which is not carried by the piston and is located inside the pumping chamber. More in details CH-675312 and FR-2465903 disclose an intake valve which comprises a plug axially moving inside the pumping chamber, and an opposing spring located inside the pumping chamber with a first end coming to bear against the plug and a second end coming to bear against the wall of the valve-like body, in such a manner as to maintain the plug bearing against the piston to engage the ingress of the passing duct formed within the piston.
  • the purpose of the present invention is to provide an electro-magnetically actuated volumetric pump able to overcome the above cited drawbacks and to ensure an extremely precise control of the oil capacity throughout the whole range of use of an internal combustion engine, with relatively low production costs.
  • a volumetric pump comprising a valve-like body, and at least a piston mounted axially sliding inside a seat formed within the valve-like body; the said seat being in communication with atmosphere by way if a supply duct and an intake duct, and the said piston defining inside the said seat at least a variable-volume pumping chamber; the volumetric pump also comprising flexible means able to retain the said piston in the resting position in which it minimises the volume of the said pumping chamber, a coil of electrically conductive material which when energised is able to provide a magnetic field allowing the axial movement of the piston inside the said seat to produce a variation in the volume of the said pumping chamber, and at least an intake valve and a discharge valve able to regulate respectively the incoming and outgoing flow of fluid from the said seat; the said intake valve being located inside the pumping chamber, not carried by the piston; the said volumetric pump being characterised in that it also comprises along the said intake duct a disc with a central calibrated hole.
  • reference number 1 indicates the whole of a volumetric pump assembly able to be used, preferably though not necessarily, to circulate the lubricating oil in a two-stroke internal combustion engine.
  • the volumetric pump 1 comprises a valve-like body 2 of essentially cylindrical form, which extends coaxially with a longitudinal axis A, and has internally a seat 3 which extends preferably, though not necessarily, coaxially with axis A, and a pair of ducts 4 and 5 able to bring into communication the two axial ends of the seat 3 itself with atmosphere.
  • the volumetric pump 1 also comprises a piston 6 made of ferromagnetic material, which is located axially mobile within the seat 3 formed in the valve-like body 2, and defines inside the seat 3 itself a variable volume pumping chamber 8. Obviously the connection between the piston 6 and the seat 3 has a fluid-proof seal.
  • the duct 4 communicates directly with the chamber 8, and defines the volumetric pump supply duct 1, whereas duct 5 communicates with the seat 3 of the opposing part of the chamber 8 in relation to the piston 6, and defines the intake duct of the volumetric pump 1.
  • ducts 4 and 5 extend coaxially with the axis A running in opposition to the seat 3 in such a way that each ends correspondingly in a respective end of the valve-like body 2.
  • Such ends are designed in such a way as to allow coupling to pipework in which the lubricating oil circulates.
  • the piston 6 has a passing hole 9, which extends coaxially with the axis A along the whole length of the piston 6 itself, in such a way as to ensure the communication of the chamber 8 with the duct 5.
  • the volumetric pump 1 finally comprises a retaining spring 10 able to retain the piston 6 in a rest position in which, the piston 6 minimises the volume of the chamber 8, and a coil 11 made of electrically conducting material placed coaxially with axis A, on the outside of the valve-like body 2.
  • the said coil 11 is able to generate when energised with electricity, a magnetic field and is located on the valve-like body 2 in such a manner that the magnetic field produced thereby causes an axial movement of the piston 6 so as to displace the piston 6 itself from the rest position, thus increasing the volume of chamber 8.
  • the said displacement takes place against the action of spring 10.
  • the seat 3 is sub-divided in two portions 3a and 3b of differing diameter, the piston 6 being mounted to slide within portion 3a of greater diameter, whereas the chamber 8 comprises the portion 3b of the seat 3 and as is more clearly explained below, part of the portion 3a when it reaches its maximum volume.
  • the spring (70) on the other hand is located coaxially with the axis A inside the portion 3a of the part opposing the chamber 8 in relation to the piston 6 and presents a first end bearing against the piston 6 and a second end bearing against the bottom of the seat 3, in such a manner as to maintain the piston 6 bearing against the shoulder 7 connecting portions 3a and 3b of the seat 3 one to the other, or in the rest position.
  • the volumetric pump 1 also has a disc 12 with a calibrated centre hole, which is located coaxially with the axis A in such a way as to present the calibrated hole aligned with the duct 5.
  • the volumetric pump 1 also includes an intake valve 13 able to regulate the access of lubrication oil to the inside of the chamber 8, and a discharge valve 14 able to regulate the exit of the lubricating oil from the chamber 8.
  • the intake valve 13 is located inside the chamber 8, to coincide with the passing hole 9 of the piston 6, whereas the discharge valve 14 is located in the duct 4 immediately downstream from the chamber 8.
  • the valve 13 has a plug 15 located axially sliding inside the chamber 8, and an opposing spring 16 located inside the chamber 8 coaxially with axis A, with a first end bearing against the plug 15 and a second end bearing against the wall of the valve-like body 2, in such a manner as to maintain the plug 15 bearing on the piston 6 in such a way as to prevent with a fluid-sealing means the ingress from the passing hole 9.
  • the valve 14 comprises instead a plug 17 located axially sliding inside the duct 4, and an opposing spring 18 located inside the duct 4 coaxially with the axis A, with a first end bearing against the plug 17 and a second end bearing against an annular shoulder 19 located inside the duct 5, in such a way as to keep the plug 17 bearing against a contraction 20 located at inlet of duct 5.
  • both the plug 15 as well as the plug 17 consist of a metallic material spherically-formed body.
  • volumetric pump 1 is preferably though not necessarily, fitted with a filter component 21 installed inside the duct 5.
  • the valve body 2 consists of three cylindrical portions, respectively referenced 2a, 2b, 2c, in line along axis A, and made integral with each other by an external shell 22 which extends coaxially to axis A to protect the coil 11.
  • the duct 5 is achieved inside the cylindrical portion 2a
  • the seat 3 is achieved inside the cylindrical portion 2b
  • the duct 4 is achieved inside the cylindrical portion 2c.
  • volumetric pump 1 Operation of the volumetric pump 1 is now described assuming that the pump is located along a lubricating oil circulation duct.
  • the opposing spring 16 nevertheless does not manage to keep the plug 15 bearing against piston 6, owing either to the inertia of the plug 15 or to the discharging lubricating oil forced through the passing hole (9).
  • the lubricating oil occupying the portion 3a of the seat 3 together with the piston 6, in fact will discharge more easily through the passing hole (9) formed in the piston 6 than through the calibrated hole in the disc 12, also facilitated in this by the depression which occurs inside the chamber 8 owing to the rapid increase in volume.
  • the opposing spring 18 ensures the return of the plug 17 to bear against the throttle 20 produced at the point of inlet of the duct 5.
  • the capacity of the volumetric pump 1 is a function of the frequency with which the piston 6 is displaced inside the seat 3, that is to say of the frequency with which an electric current is made to pass through the coil 11.
  • the piston 6 is made of permanent magnet material.
  • the piston 6 is double acting, and defines inside its seat two variable volume pumping chambers 9 complementary to each other.
  • Each chamber 8 is connected with atmosphere through a supply duct 4 which extends coaxial with the axis A, and has an intake valve 13 and a discharge valve 14, whereas the intake duct 5 is in common communication with both chambers 9, and extends inside the valve-like body 2 perpendicularly to the axis A, along an appendix of the valve body 2 which in turn extends perpendicularly to axis A.
  • the duct 5 faces a branch 9a of the passing hole 9 which extends in the piston 6 perpendicularly to axis A, and the disc 12 is located along the duct 5, immediately upstream from the seat 3.
  • valve body 2 presents two seats 3 each of which is actuated in a sliding manner by a respective piston 6, which defines a pumping chamber 8.
  • each chamber 8 is is connected to atmosphere through a supply duct 4 which extends coaxial to the axis A, and is provided with its own intake valve 13 and its own discharge valve 14.
  • the intake duct 5 is in communication with both seats 3, and a terminal portion thereof extends into the valve body 2 coaxially to the axis A, along an appendix in the valve body 2 which extends in turn, perpendicularly to axis A.
  • volumetric pump 1 The advantages of the volumetric pump 1 described above are evident: the presence of the disc 12 with the central calibrated hole along the intake duct 5 avoids any undesired flow back of liquid in the intake duct 5 during the axial movement of the piston 6, thus allowing an optimal filling of the pumping chamber 8 at high speeds.
  • a further advantage derives from the fact that the plug 15 for valve 13 cannot be deformed so that the volume of the chamber 8 is constant in whatsoever operating condition.
  • the volumetric pump 1 can thus be transformed into a metering arrangement always able to provide the same volume of oil under pressure on each electrical current impulse.
  • volumetric pump 1 has extremely simple construction, with a limited number of component parts in relative movement, and the fact that it allows direct piloting from an electronic central unit which, by varying the frequency of the supply to the coil 11, it is possible to control in real time and with extreme precision the capacity thus provided.
  • volumetric pump 1 described and illustrated herein without thereby exceeding the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Reciprocating Pumps (AREA)

Claims (14)

  1. Pompe volumétrique (1) comprenant un corps en forme de soupape (2), et au moins un piston (6) monté de façon à coulisser de manière axiale à l'intérieur d'un siège (3) formé dans le corps en forme de soupape (2) ; ledit siège (3) étant en communication avec l'atmosphère par un conduit d'alimentation (4) et un conduit d'admission (5), et ledit piston (6) définissant à l'intérieur dudit siège (3) au moins une chambre de pompage à volume variable (8) ; la pompe volumétrique (1) comprenant également un moyen flexible (10) capable de retenir ledit piston (6) dans la position de repos dans laquelle il minimise le volume de ladite chambre de pompage (8), une bobine (11) en matériau conducteur d'électricité qui, lorsqu'elle est activée, est capable de fournir un champ magnétique permettant le déplacement axial du piston (6) à l'intérieur dudit siège (3) pour produire une variation du volume de ladite chambre de pompage (8), et au moins une soupape d'admission (13) et une soupape d'évacuation (14) capables de réguler respectivement l'écoulement entrant et l'écoulement sortant de fluide provenant dudit siège (3) ; ladite soupape d'admission (13) se situant à l'intérieur de la chambre de pompage (8), non portée par le piston (6) ; ladite pompe volumétrique (1) étant caractérisée en ce qu'elle comprend également le long dudit conduit d'admission (5), un disque (12) comportant un trou calibré central.
  2. Pompe volumétrique selon la revendication 1, caractérisée en ce que ledit conduit d'alimentation (4) relie directement ladite chambre de pompage (8) à l'atmosphère ; ledit piston (6) étant plutôt doté d'un conduit de passage (9) capable d'assurer la communication de la chambre de pompage (8) avec ledit conduit d'admission.
  3. Pompe volumétrique selon la revendication 2, caractérisée en ce que ledit piston (6) subdivise le siège (3) à l'intérieur du corps en forme de soupape (2) en deux parties qui sont reliées à l'atmosphère respectivement à l'aide du conduit d'alimentation (4) et à l'aide du conduit d'admission (5) ; le conduit de passage (9) dans le piston (6) étant capable de relier ensemble les deux parties dudit siège (3).
  4. Pompe volumétrique selon la revendication 3, caractérisée en ce que ledit conduit d'alimentation (4) et ledit conduit d'admission (5) relient à l'atmosphère les deux extrémités axiales du siège (3) formé à l'intérieur dudit corps en forme de soupape.
  5. Pompe volumétrique selon l'une quelconque des revendications 2 à 4, caractérisée par le fait que ladite soupape d'admission (13) comprend un bouchon (15) se déplaçant de manière axiale à l'intérieur de la chambre de pompage (8), et un ressort opposé (16) situé à l'intérieur de la chambre de pompage (8) avec une première extrémité venant s'appuyer contre le bouchon (15) et une seconde extrémité venant s'appuyer contre la paroi du corps en forme de soupape (2), de manière à maintenir le bouchon (15) appuyé contre le piston (6) de façon à engager, tout en maintenant le conduit de passage (9) engagé dans des conditions d'étanchéité, l'entrée du conduit de passage (9) formé dans ledit piston (6) dans des conditions d'étanchéité.
  6. Pompe volumétrique selon l'une quelconque des revendications précédentes, caractérisée par le fait que ledit conduit d'alimentation (4) a, immédiatement en aval de ladite chambre de pompage (8), un moyen d'étranglement (20), et ladite soupape d'évacuation (14) comprend un bouchon mobile (17) à l'intérieur dudit conduit d'alimentation (4), et un ressort opposé (18) capable de maintenir ledit bouchon (17) appuyé contre ledit moyen d'étranglement (20), l'engageant dans des conditions d'étanchéité.
  7. Pompe volumétrique selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit disque (12) se situe le long dudit conduit d'admission (5) de façon à présenter son trou calibré de manière coaxiale à l'axe (A) du conduit.
  8. Pompe volumétrique selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend un composant de filtrage (21) situé le long dudit conduit d'admission (5).
  9. Pompe volumétrique selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit siège (3), ledit conduit d'alimentation (4), ledit piston (6) et son trou de passage (9) sont étendus de manière coaxiale à un même axe longitudinal (A).
  10. Pompe volumétrique selon la revendication 9, caractérisée en ce que ledit corps en forme de soupape (2) a une forme essentiellement cylindrique et s'étend de manière coaxiale audit axe longitudinal (A).
  11. Pompe volumétrique selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit piston (6) définit sur l'intérieur dudit siège (3) deux chambres de pompage à volume variable (9) complémentaires l'une de l'autre ; lesdites deux chambres de pompage (8) étant chacune directement reliée à un conduit d'alimentation respectif (4), et les deux communiquant avec un même dit conduit d'admission (5) par un trou de passage (9) formé dans ledit piston (6).
  12. Pompe volumétrique selon l'une quelconque des revendications 1 à 10, caractérisée en ce qu'elle comprend deux pistons (6) montés de façon à coulisser de manière axiale à l'intérieur d'un siège respectif (3) formé dans ledit corps en forme de soupape (2) ; les pistons (6) définissant des chambres de pompage à volume variable respectives (8) à l'intérieur des sièges correspondants (3).
  13. Pompe selon l'une quelconque des revendications précédentes, caractérisée par le fait que ledit piston (6) est fait d'un matériau ferromagnétique.
  14. Pompe selon l'une quelconque des revendications 1 à 12, caractérisée par le fait que ledit piston (6) est fait d'un matériau à aimant permanent.
EP99107763A 1998-04-27 1999-04-19 Pompe volumétrique Expired - Lifetime EP0953764B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98BO000263A IT1299987B1 (it) 1998-04-27 1998-04-27 Pompa volumetrica.
ITBO980263 1998-04-27

Publications (2)

Publication Number Publication Date
EP0953764A1 EP0953764A1 (fr) 1999-11-03
EP0953764B1 true EP0953764B1 (fr) 2004-09-29

Family

ID=11343135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99107763A Expired - Lifetime EP0953764B1 (fr) 1998-04-27 1999-04-19 Pompe volumétrique

Country Status (4)

Country Link
EP (1) EP0953764B1 (fr)
DE (1) DE69920566T2 (fr)
ES (1) ES2229574T3 (fr)
IT (1) IT1299987B1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4203160B2 (ja) * 1998-11-13 2008-12-24 株式会社ミクニ 電磁ポンプ
EP1227242B1 (fr) * 2001-01-24 2007-01-17 Mikuni Corporation Systéme d'alimentation du combustible
ITMI20010419A1 (it) * 2001-03-01 2002-09-01 Inc Dell Orto S P A Pompa comandata da elettromagnete
ITMI20010420A1 (it) * 2001-03-01 2002-09-01 Inc Dell Orto S P A Pompa comandata da elettromagnete
ITMI20012647A1 (it) * 2001-12-13 2003-06-13 Dellorto Spa Pompa comandata da elettromagnete
ITMI20050688A1 (it) * 2005-04-18 2006-10-19 Dellorto Spa Impianto di alimentazione del combustibile per motori a combustione interna e gruppo pompa-iniettore ad azionamento elettromagnetico utilizzato in tale impianto
DK179750B1 (en) 2017-12-13 2019-05-07 Hans Jensen Lubricators A/S Large slow-running two-stroke engine and method of lubri-cating such engine, as well as an injector with an electric pumping system for such engine and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES252076Y (es) * 1979-07-16 1981-11-01 Bomba electromagnetica alterna para liquidos
GB8709082D0 (en) * 1987-04-15 1987-05-20 Eaton Sa Monaco Electrical fluid pump
CH675312A5 (en) * 1988-06-13 1990-09-14 Rueck & Meier Ag Fluid dosing device using timed pump operation - compensates set time for detected variation in pump flow
US5567131A (en) * 1995-04-20 1996-10-22 Gorman-Rupp Industries Spring biased check valve for an electromagnetically driven oscillating pump

Also Published As

Publication number Publication date
IT1299987B1 (it) 2000-04-04
DE69920566T2 (de) 2005-12-08
EP0953764A1 (fr) 1999-11-03
ITBO980263A0 (it) 1998-04-27
ES2229574T3 (es) 2005-04-16
DE69920566D1 (de) 2004-11-04
ITBO980263A1 (it) 1999-10-27

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