EP1336049A1 - Clapet de securite pour systeme de delivrance dosee de fluides - Google Patents
Clapet de securite pour systeme de delivrance dosee de fluidesInfo
- Publication number
- EP1336049A1 EP1336049A1 EP01980604A EP01980604A EP1336049A1 EP 1336049 A1 EP1336049 A1 EP 1336049A1 EP 01980604 A EP01980604 A EP 01980604A EP 01980604 A EP01980604 A EP 01980604A EP 1336049 A1 EP1336049 A1 EP 1336049A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seat
- safety valve
- rod
- shutter means
- translation
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000013013 elastic material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/04—Injectors peculiar thereto
- F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
- F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
Definitions
- the present invention relates to a safety valve intended to equip a fluid spraying system.
- the present invention relates more particularly to a safety valve, integrated into a system used for the metered delivery of fluids, and making it possible to act, in the event of a malfunction of the shutter means of the aforementioned device, on the flow of injected fluid.
- Such a system can, for example, be used in an injection device such as that described in patent application FR 99-14548, filed by the Applicant.
- a particular device intended for spraying fluids in the fuel injection systems of a motor vehicle, and characterized in particular in that a rod or needle deforms elastically under the stress of ultrasonic waves, so as to define at its end an annular ejection slot relative to a valve seat.
- the aforementioned needle is of the outgoing or suspended type and cooperates at its other end with a mass and elastic return means housed in a cavity formed in the rear part of the housing of the injector.
- the device thus described is intended to be supplied by a pressurized fluid.
- the body of the injector is permanently filled with fluid and the shutter means formed by the valve on its seat seal the system at rest when no deformation is applied to the needle.
- an outgoing needle injector is therefore characterized by the fact that the needle is subjected to tensile stresses.
- the opening is generated by deformations of the needle.
- said needle has a relatively small section so as to reduce the amount of energy required to open the valve.
- a drawback of the device described in patent application FR 99-14548 stems from the fact that in the event of the needle head breaking, no means of regulation is provided in order to avoid the uninterrupted injection of fuel under pressure inside the combustion chamber.
- the object of the present invention is therefore to propose the production of a safety valve, making it possible to avoid the aforementioned problems, in the event of a needle rupture on an injector with outgoing needle.
- the stress generated by the elastic return means of the needle is used to actuate and maintain a safety valve in the high pressure supply circuit. More precisely, the initial prestressing, necessary to ensure the tightness of the valve seat, and to which the needle is subjected, is transferred, when said needle breaks, to the safety valve.
- said valve is formed, on the one hand, of a movable part whose end is at least partially spherical, and on the other hand, of a fixed seat, which may be of shape conical, shaped in the end of the channel intended to supply the injector with fuel, so that, in the event of rupture of the needle, the abovementioned spherical part, initially detached from its seat, comes to cooperate with said seat under the action of the forces generated by the elastic return means, and thus obstruct the channel through which the fuel arrives, thus preventing the said fuel from spilling inside the cylinder.
- the movable part of the valve is shaped on the end of a mass which constitutes the mechanism for break in impedance as described in patent application FR99-14548.
- the translation of the aforementioned mass under the action of elastic return forces, in the event of a rupture of the needle causes a translation of the movable part of the valve, so that the spherical end of said movable part comes to cooperate with the conical fixed part and thus causes the filling channel of the injector to be closed.
- the fuel supply channel has a substantially smaller outlet section than the nose of the injector.
- FIG. 1 represents a first embodiment of the safety valve, object of the present invention, the valve being open
- FIG. 2 represents the same view as FIG. 1, the valve being closed,
- FIG. 3 represents a second embodiment of the safety valve, the valve being open,
- FIG. 4 shows the same view as Figure 1, the valve being closed
- Figure 5 shows a sectional view of particular elements, the mass and the return means elastic of the injection system according to the second embodiment, according to different positions, so as to explain the principle of operation of the present invention.
- the common elements are represented with the same reference.
- the injection system consists of an injector body 3 comprising an interior cavity 15 in which are arranged elastic return means 1, which exert a prestress on a rod 4, by means of a mass 5, integral with a first end, said rod 4, over a fixed length.
- the other end of the rod 4 comprises a head 6 resting on a valve seat 7 disposed on the injector body 3.
- the system thus forms a valve which ensures at rest the seal of the injector nose.
- the internal cavity 15 of the body of the injector 3 is filled with fuel under pressure, so that the forces exerted by the fluid are distributed, at the level of the head 6 of the rod 4, on a section surface denoted SI.
- the utility of the prestressing exerted by the elastic return means 1 is to oppose the aforementioned forces in order to avoid detachment of the said head 6 of the rod 4 relative to the valve seat 7 under the action of pressure forces.
- this preload is increased to compensate for play and to guarantee a total seal, which does not only result in a macroscopic equilibrium of the forces exerted on the head of the rod.
- the internal cavity 15 of the injector housing 3 is intended to be closed by means of a closing member 12 inside which is formed a bore 8.
- the supply of pressurized fuel to the injector housing 3 is carried out by means of the bore 8 which opens into the internal cavity 15 of the injector housing 3 by forming an orifice, or seat 9.
- the valve consists of two elements, the first consists by the seat 9, the second by a shutter means 10 which is integral with the mass 5 and extends over one end of the latter, said mass 5 cooperating in abutment with the elastic return means 1 on the opposite end, the said elastic return means 1 themselves being supported on the bottom of the internal cavity 15 of the injector housing 3.
- the shutter means 10 has an upper part 11 which is at least partially conical and preferably spherical, which may, for example, be produced using a ball bearing ball, preferably of low grade ( ⁇ 10) so as to benefit of a good surface condition guaranteeing a good seal when being pressed on the seat 9.
- Said bore 8 is produced so that at least the seat 9 thus obtained is aligned with the shutter means 10, so that the upper part 11 of the shutter means 10 can come to cooperate with the seat 9 when a vertical translation along the orientation referenced A is applied to the mass 5.
- Said means for translating the mass 5 are provided by the elastic return means 1 when a rupture occurs in the rod.
- the mass 5 is in equilibrium under the joint action of the forces generated by the elastic return means 1 and the efforts to retain the rod 4 due to the action of the head 6 of the rod 4 on the valve seat 7.
- the upper end 11 of the shutter means 10 then defines with the seat 9, a distance e2. In the case of normal operation of the injector, the shutter means 10 therefore does not prevent the free circulation of fuel. As long as the rod 4 is not broken, the fuel flows freely through the conduit 8. It should be emphasized that it is not the pressure forces which generate the opening of the safety valve.
- a condition for sealing the valve on its seat is then obtained by combining (1), (2) and (3):
- FIG. 3 which represents a second embodiment of the present invention, there is an architecture similar to that described in FIGS. 1 and 2, except that the shutter means 10 are no longer secured to the mass 5, and that secondary elastic return means 2 have been added between the closure member 12 of the injector housing 3 and the mass 5.
- the aforementioned shutter means 10 always consists of a member of at least partially spherical shape, for example a ball bearing ball. It is placed, free in translation in direction A, inside a sheath 13 which extends between the seat 9, and the end of a pin 14 shaped on the mass 5, the sheath 13 having each of its ends an obviously annular diameter substantially smaller than that of the shutter means 10, so as to define two extreme positions between which the shutter means 10 can move.
- the sleeve 13 is integrally connected at one of its two ends with the cover 12.
- the axis of the sleeve 13 is aligned with the seat 9, so that the shutter means 10, under the action of a translation oriented along A can cooperate with seat 9.
- the second section narrowing, shaped at the other end of the sheath, defines a second annular space inside which the cylindrical pin 14 can slide, the latter being integral with the end of the mass 5.
- the length of the cylindrical pin 14 is adapted so as to cause, in the event of a rupture of the rod 4, the translation of the shutter means 10 along A, until the shutter means 10 comes to cooperate with the seat 9.
- the means for translating the pin 14 are provided by the forces generated by the elastic material 1 on the mass 5.
- the valve system thus formed therefore makes it possible to block the fuel supply channel, that is to say the bore 8, generating a closure of the seat 9 by the closure means 10 during a rupture of the rod 4.
- the sealing condition of the valve can then be expressed by taking stock of the forces exerted by the mass 5 on the shutter means 10.
- FIG. 5 represents different positions of the mass 5 (shown in solid lines), and elastic return means 1 and secondary elastic return means 2 (shown in dotted lines) for a better understanding of the operating principle of the second mode of realization of the invention. Also shown on this diagram are the external forces applied to mass 5.
- This force is opposed to the pressure forces which apply at the level of the orifice 9 of the bore 8, on a section S2.
- F ob ⁇ rateUr Kx [ ⁇ X x -X l ) -2x ⁇ e, Ae 1 ) ⁇
- the functionality of the system is dependent on the ratio of sections SI and S2.
- Another advantage of this embodiment comes from the fact that the guiding in translation of the part mobile shutter means is no longer provided by the mass but by the sleeve, which reduces the guiding constraints in translation of the mass.
- Another advantage of this second embodiment is to allow decoupling in the production of the movable part of the shutter means of the safety valve and that of the mass.
- the use of a calibrated ball bearing ball as a shutter means no longer requires, for example, taking into account the means for fixing said ball to the solid.
- the possible variation in thickness between the upper part of the mass can be easily taken into account by modifying the height of the pin, shaped at the end of the mass.
- this second embodiment of the safety valve is particularly suitable in the case of integration into a fluid spraying device, as described in patent application FR99-14548, filed by the Applicant.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Lift Valve (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0013824A FR2816009B1 (fr) | 2000-10-27 | 2000-10-27 | Clapet de securite pour systeme de delivrance dosee de fluides |
FR0013824 | 2000-10-27 | ||
PCT/FR2001/003242 WO2002035085A1 (fr) | 2000-10-27 | 2001-10-19 | Clapet de securite pour systeme de delivrance dosee de fluides |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1336049A1 true EP1336049A1 (fr) | 2003-08-20 |
EP1336049B1 EP1336049B1 (fr) | 2006-09-13 |
Family
ID=8855821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01980604A Expired - Lifetime EP1336049B1 (fr) | 2000-10-27 | 2001-10-19 | Clapet de securite pour systeme de delivrance dosee de fluides |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1336049B1 (fr) |
DE (1) | DE60123106T2 (fr) |
FR (1) | FR2816009B1 (fr) |
WO (1) | WO2002035085A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2857418B1 (fr) * | 2003-07-10 | 2007-04-06 | Renault Sa | Dispositif d'application de precontrainte a une soupape d'un injecteur de carburant et moyens de rupture d'impedance acoustique de l'injecteur |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2488655A2 (fr) * | 1980-08-18 | 1982-02-19 | Rockwell International Corp | Injecteur de carburant equipe d'un clapet de retenue a vibrations ultra-sonores, notamment pour moteur diesel |
JPS60116848A (ja) * | 1983-11-28 | 1985-06-24 | Hitachi Ltd | 燃料噴射弁 |
US5392994A (en) * | 1993-11-01 | 1995-02-28 | General Motors Corporation | Fuel injection nozzle |
FR2801346B1 (fr) * | 1999-11-19 | 2002-10-31 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
-
2000
- 2000-10-27 FR FR0013824A patent/FR2816009B1/fr not_active Expired - Fee Related
-
2001
- 2001-10-19 DE DE60123106T patent/DE60123106T2/de not_active Expired - Lifetime
- 2001-10-19 EP EP01980604A patent/EP1336049B1/fr not_active Expired - Lifetime
- 2001-10-19 WO PCT/FR2001/003242 patent/WO2002035085A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0235085A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2816009A1 (fr) | 2002-05-03 |
DE60123106D1 (de) | 2006-10-26 |
EP1336049B1 (fr) | 2006-09-13 |
WO2002035085A1 (fr) | 2002-05-02 |
DE60123106T2 (de) | 2007-02-15 |
FR2816009B1 (fr) | 2003-05-16 |
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