EP1902214B1 - Pressure relief device - Google Patents
Pressure relief device Download PDFInfo
- Publication number
- EP1902214B1 EP1902214B1 EP20060764780 EP06764780A EP1902214B1 EP 1902214 B1 EP1902214 B1 EP 1902214B1 EP 20060764780 EP20060764780 EP 20060764780 EP 06764780 A EP06764780 A EP 06764780A EP 1902214 B1 EP1902214 B1 EP 1902214B1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- ball
- plunger
- chamber
- orifice
- 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.)
- Not-in-force
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Classifications
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- 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
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- 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
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0043—Two-way valves
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- 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
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7738—Pop valves
- Y10T137/7739—Pop closing valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7738—Pop valves
- Y10T137/774—Pop pressure reactor in inflow to valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7738—Pop valves
- Y10T137/7741—Pop pressure reactor in branched released path
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
Definitions
- the device has in this case a function of safety and protection of the system by reducing the pressure in case of malfunction of one of the control components (injector, pressure sensor, flow regulator).
- the pressure relief valve is subjected to the high pressure of the injection system, that which exists inside the common rails used for injection into the engines. This pressure can range from 200 to 2000 bars depending on the systems.
- This type of discharge valve is conventionally constituted by a jacket, forming the outer casing, inside which slides a pusher axially biased by return means and actuating means for closing off an orifice communicating in certain conditions an upstream chamber for admission of the high-pressure fluid with an exhaust downstream chamber.
- the downstream chamber then comprises at least one exhaust opening of the fluid, for example to the vehicle tank.
- the sealing means are maintained in the closed position of the orifice by the return means within a predetermined pressure threshold in the upstream chamber. This threshold is determined by the use of biasing means of suitable caliber.
- this device is a safety device, supposed to limit the increase in pressure to avoid damaging the system components. In order for it to perform its function correctly, it would therefore be necessary that, when the closure means open, the pressure decreases or, at worst, remains constant.
- the present invention proposes to overcome this disadvantage, and to promote a solution to achieve a real decrease in the value of the pressure in the high pressure circuit when the discharge valve is open.
- the constructive arrangement which is the subject of the invention allows for this effect a compensation of the hydrodynamic effect which was not taken into account in the previous devices.
- This compensation is mainly aimed at reducing the pressure gradient when the flow rate to be discharged increases.
- the pusher conventionally devoid of axial passageways for the fluid and sliding with a small functional clearance in the liner, is further dimensioned to partially obstruct each exhaust opening, including at least one is connected to an opening also made in the liner and opening at least partially on the opposite side of the pusher, so as to provide a back pressure.
- the increase in pressure in the high-pressure circuit is thus controlled in the direction of a limitation when the flow rate increases.
- the pressure limiter of the invention comprises closure means consisting of a ball housed in a hemispherical seat whose bottom is pierced with the communication port between the upstream chambers and downstream.
- the ball also cooperates with an extension protruding axially from the pusher and which exerts an axial direction action on it.
- the hemispherical seat is in fact disposed at the bottom of an axial well opening into the downstream chamber, which extends the orifice connecting the chambers and is adapted to accommodate the projection protruding from the pusher.
- the axial protrusion protruding from the pusher and the ball are in one piece.
- the upstream chamber, the orifice connecting the upstream and downstream chambers, and the seat of the closure means are arranged in a single piece closing one end of the jacket.
- This part manufactured separately, is simply attached to one end of the jacket, obstructing the bore in which the slide pushes.
- the return means consist of a compression spring.
- the ends of the spring are fixed on two axial studs respectively protruding from the pusher and a plug closing the end of the sleeve opposite the high pressure chamber.
- said cap obeys the same logic as the part in which the seat of the ball is made.
- the downstream chamber has two exhaust openings, as already mentioned, which make it possible to return the fluid discharged from the high-pressure circuit to for example a fuel tank.
- the common rail (20) containing the injectors (21) is fed with fuel by a high pressure pump (22) extracting the gasoline from a tank (23) via a solenoid valve (24) for regulating the inlet flow rate .
- a pressure sensor (25) also arranged in the common rail (20), is connected to an electronic central unit (26) which controls in particular the solenoid valve (24).
- the system pressure is limited, in the event of failure of one of the circuit control components, by discharging the flow to the return drain of the pump (22). This discharge is done in the pressure limiter (27) which constitutes the invention.
- the fuel thus evacuated is returned to a reservoir (28).
- the pressure limiter (27) is in this case a purely mechanical component.
- Those used today, an example of which is shown in figure 2 are based on a jacket (4) forming the outer casing of the limiter, and provided with a central bore in which can slide a pusher (3). It is closed at its ends on the one hand by a part (1) at which is made the connection to the high-pressure circuit, and secondly by a plug (6).
- the seat (8) of the ball (2) flares towards a chamber (10) downstream delimited by the inner wall of the part (1), one side of the pusher (3) and the inner wall of the sleeve (4). ).
- the ball (2) which acts as a sealing means, is pressed against its seat (8) by an axial protrusion (11) protruding from the pusher (3).
- this protrusion (11) has a length such that the axial dimension of the downstream chamber (10) thus created is sufficient to prevent any covering of the exhaust openings (12, 12 ') by the pusher (3).
- the equilibrium state in the closed position results from the existence of a spring (5) which recalls the pusher (3), and consequently the ball (2), in the closed position.
- This spring (5) is centered at its two ends respectively to the pusher (3) and the plug (6) by axial studs (13, 14) which protrude.
- ⁇ P hydrodynamic depends directly on the flow and therefore the closing section as well as the lifting of the ball.
- ⁇ ⁇ P hydrodynamic K ⁇ P hydrodynamic / S F ⁇ xX b Q with hydrodynamic KP: hydrodynamic stiffness of the ball / seat subassembly.
- the pusher (3) now devoid of axial passages for the fluid, is further dimensioned so that, when it holds the ball (2) against its seat (8), it impinges on the surfaces of the openings (12). , 12 '), thus creating a hydraulic restriction to the rights of these openings. Under the effect of the discharge rate, an overpressure is created in the chamber (10).
- the two opposite cross sections of the pusher (3) therefore receive a different pressure. This differential creates on the pusher (3) a force that tends to oppose the action of the spring, and reduces, depending on the discharge rate, the load of the spring (5) on the ball (2).
- the new value of P rail results in a characteristic rail pressure curve as a function of the flow rate as shown in FIG. figure 5 .
- the displacement of said pusher (3) can be substantially greater than in the versions of the prior art.
- its seat (8) was then placed at the bottom of a well (16) which guides and centers surplus the protrusion (11) protruding from the pusher (3) at the time of the making.
- the protrusion (11) prevents in any case the output of the ball (2).
- the configuration of the invention allows in particular a significant reduction in the dimensions of the limiter of the invention.
Abstract
Description
La présente invention s'applique à un limiteur de pression utilisable dans un circuit de fluide à haute pression pour limiter la pression en cas de défaillance d'un des composants du circuit. Il s'agit en fait d'un clapet de décharge en pression utilisé par exemple dans des systèmes d'injection de carburant à rail commun.The present invention applies to a pressure limiter that can be used in a high-pressure fluid circuit to limit the pressure in the event of failure of one of the components of the circuit. It is in fact a pressure relief valve used for example in common rail fuel injection systems.
Le dispositif a en l'espèce une fonction de sécurité et de protection du système en réduisant la pression en cas de problème de fonctionnement de l'un des composants de contrôle (injecteur, capteur de pression, régulateur de débit). Dans cet exemple, qui constituera le fil conducteur de la présente description, le clapet limiteur de pression est soumis à la haute pression du système d'injection, celle qui existe à l'intérieur des rails communs utilisés pour l'injection dans les moteurs. Cette pression peut aller de 200 à 2000 bars selon les systèmes.The device has in this case a function of safety and protection of the system by reducing the pressure in case of malfunction of one of the control components (injector, pressure sensor, flow regulator). In this example, which will be the thread of this description, the pressure relief valve is subjected to the high pressure of the injection system, that which exists inside the common rails used for injection into the engines. This pressure can range from 200 to 2000 bars depending on the systems.
Ce type de clapet de décharge est classiquement constitué d'une chemise, formant l'enveloppe externe, à l'intérieur de laquelle coulisse un poussoir sollicité axialement par des moyens de rappel et actionnant des moyens d'obturation d'un orifice faisant communiquer dans certaines conditions une chambre amont d'admission du fluide à haute pression avec une chambre aval d'échappement. Cette dernière est délimitée par la paroi de la chemise, un côté du poussoir et la paroi en regard dans laquelle est pratiqué l'orifice obturable. La chambre aval comporte ensuite au moins une ouverture d'échappement du fluide, par exemple à destination du réservoir du véhicule. Pour pouvoir jouer son rôle de clapet de déchargement uniquement en cas de problème, les moyens d'obturation sont maintenus en position d'obturation de l'orifice par les moyens de rappel en deçà d'un seuil prédéterminé de pression dans la chambre amont. Ce seuil est déterminé par l'emploi de moyens de rappel de calibre adapté.This type of discharge valve is conventionally constituted by a jacket, forming the outer casing, inside which slides a pusher axially biased by return means and actuating means for closing off an orifice communicating in certain conditions an upstream chamber for admission of the high-pressure fluid with an exhaust downstream chamber. The latter is delimited by the wall of the liner, one side of the pusher and the wall opposite in which is practiced the closable orifice. The downstream chamber then comprises at least one exhaust opening of the fluid, for example to the vehicle tank. To be able to play its role of unloading valve only in case of a problem, the sealing means are maintained in the closed position of the orifice by the return means within a predetermined pressure threshold in the upstream chamber. This threshold is determined by the use of biasing means of suitable caliber.
Dans les dispositifs de l'art antérieur, les moyens d'obturation sont en général constitués d'une bille qui vient obturer un siège conique pratiqué dans la paroi percée de l'orifice de communication entre les chambres, la bille étant alors plaquée contre ledit siège par l'action du ressort sur le poussoir. Des dispositifs comme celui divulgué dans le document
Lorsque l'action due à la pression existant dans le circuit à haute pression (c'est-à-dire dans le rail commun) devient supérieure à la charge initiale du ressort, la bille se déplace et permet en principe la limitation de la pression par décharge du débit excédentaire vers la chambre aval, puis échappement vers un réservoir. Dans les dispositifs de limitation connus, le poussoir comporte une excroissance lui permettant d'exercer une action sur la bille. Dans la position d'obturation, cette excroissance est au surplus prévue de longueur telle que la ou les ouvertures d'échappement du fluide existant dans la chambre aval ne sont pas recouvertes par le poussoir, ce qui laisse ces ouvertures totalement fonctionnelles en toutes circonstances. Le poussoir comporte par ailleurs des méplats axiaux permettant le passage du fluide vers le côté opposé du poussoir, celui sur lequel agit le ressort.When the action due to the pressure existing in the high-pressure circuit (that is to say in the common rail) becomes greater than the initial spring load, the ball moves and in principle allows the limitation of the pressure by discharging the excess flow to the downstream chamber, then exhausting to a reservoir. In known limiting devices, the pusher has a protrusion allowing it to exert an action on the ball. In the closed position, this protrusion is moreover planned in length such that the or the exhaust openings of the fluid existing in the downstream chamber are not covered by the pusher, leaving these openings fully functional in all circumstances. The pusher further comprises axial flats allowing the passage of fluid to the opposite side of the pusher, the one on which the spring acts.
Cette configuration aboutit cependant en réalité à faire croître la pression de décharge lorsque le débit augmente, sous l'effet combiné de la raideur hydraulique, qui est liée à la dynamique du fluide dans la phase de détente, et de la raideur du ressort. En d'autres termes, et le calcul de l'équation de cette courbe le confirme, la pression de décharge suit une courbe caractéristique qui voit la pression augmenter lorsque le débit augmente à partir de la valeur seuil d'ouverture de l'orifice.This configuration, however, actually leads to increase the discharge pressure when the flow increases, under the combined effect of the hydraulic stiffness, which is related to the dynamics of the fluid in the expansion phase, and the stiffness of the spring. In other words, and the calculation of the equation of this curve confirms it, the discharge pressure follows a characteristic curve which sees the pressure increase as the flow increases from the threshold value of opening of the orifice.
Or, ce dispositif est un organe de sécurité, supposé limiter l'augmentation de la pression pour ne pas endommager les composants du système. Pour qu'il remplisse sa fonction correctement, il faudrait donc que, quand les moyens d'obturation s'ouvrent, la pression diminue ou, au pire, reste constante.However, this device is a safety device, supposed to limit the increase in pressure to avoid damaging the system components. In order for it to perform its function correctly, it would therefore be necessary that, when the closure means open, the pressure decreases or, at worst, remains constant.
Ce n'est pas le cas pour les dispositifs employés jusqu'ici, qui consacrent un effet inverse puisque la pression continue à monter lorsque le débit augmente.This is not the case for the devices used so far, which devote an opposite effect since the pressure continues to rise when the flow increases.
La présente invention se propose de remédier à cet inconvénient, et de promouvoir une solution permettant d'aboutir à une décroissance réelle de la valeur de la pression dans le circuit à haute pression lorsque le clapet de décharge est ouvert. La disposition constructive qui fait l'objet de l'invention permet à cet effet une compensation de l'effet hydrodynamique qui n'était pas pris en compte dans les dispositifs antérieurs. Cette compensation vise principalement à réduire le gradient de la pression lorsque le débit à décharger augmente.The present invention proposes to overcome this disadvantage, and to promote a solution to achieve a real decrease in the value of the pressure in the high pressure circuit when the discharge valve is open. The constructive arrangement which is the subject of the invention allows for this effect a compensation of the hydrodynamic effect which was not taken into account in the previous devices. This compensation is mainly aimed at reducing the pressure gradient when the flow rate to be discharged increases.
Selon l'invention, pour parvenir à cet objectif, le poussoir, classiquement dépourvu de voies de passage axiales pour le fluide et coulissant avec un faible jeu fonctionnel dans la chemise, est de plus dimensionné pour obstruer partiellement chaque ouverture d'échappement, dont au moins une est reliée à une ouverture également pratiquée dans la chemise et débouchant au moins partiellement du côté opposé du poussoir, de manière à fournir une contre-pression.According to the invention, to achieve this objective, the pusher, conventionally devoid of axial passageways for the fluid and sliding with a small functional clearance in the liner, is further dimensioned to partially obstruct each exhaust opening, including at least one is connected to an opening also made in the liner and opening at least partially on the opposite side of the pusher, so as to provide a back pressure.
Le recouvrement des ouvertures d'échappement crée une restriction hydraulique aux droits desdites ouvertures. Et, sous l'effet du débit de décharge, cette restriction et l'absence de voies de passage dans le poussoir crée une surpression dans la chambre aval, qui agit sur le poussoir et diminue l'action du ressort en fonction de l'intensité du débit.The covering of the exhaust openings creates a hydraulic restriction to the rights of said openings. And, under the effect of the discharge rate, this restriction and the absence of passageways in the pusher creates an overpressure in the downstream chamber, which acts on the pusher and decreases the action of the spring depending on the intensity flow.
L'augmentation de pression dans le circuit à haute pression est ainsi maîtrisée dans le sens d'une limitation lorsque le débit augmente.The increase in pressure in the high-pressure circuit is thus controlled in the direction of a limitation when the flow rate increases.
L'existence concomitante d'une ouverture pratiquée dans la chemise de l'autre côté du poussoir et reliée aux ouvertures d'échappement permet en fait la création d'un différentiel de pression de part et d'autre du poussoir.The concomitant existence of an opening made in the jacket on the other side of the pusher and connected to the exhaust openings in fact allows the creation of a differential pressure on either side of the pusher.
En somme, la surpression provoquée par le débit de décharge du côté des restrictions hydrauliques d'une part, et la pression de retour de l'autre côté du poussoir d'autre part, aboutissent à générer sur ce dernier un effort qui s'oppose à l'action du ressort et diminue sa charge en fonction du débit de décharge.In sum, the overpressure caused by the discharge rate on the side of the hydraulic restrictions on the one hand, and the return pressure on the other side of the pusher on the other hand, result in generating on the latter an opposing effort. to the action of the spring and decreases its load as a function of the discharge rate.
Comme c'était déjà le cas dans ses devanciers, le limiteur de pression de l'invention comporte des moyens d'obturation consistant en une bille logée dans un siège hémisphérique dont le fond est percé de l'orifice de communication entre les chambres amont et aval.As was already the case in its predecessors, the pressure limiter of the invention comprises closure means consisting of a ball housed in a hemispherical seat whose bottom is pierced with the communication port between the upstream chambers and downstream.
La bille coopère d'ailleurs également avec une excroissance dépassant axialement du poussoir et qui exerce une action de direction axiale sur elle.The ball also cooperates with an extension protruding axially from the pusher and which exerts an axial direction action on it.
Cette excroissance, outre sa fonction de transmission du mouvement du poussoir à la bille, est particulièrement bien adapté à la configuration qui fait l'objet de l'invention. De préférence, le siège hémisphérique est en effet disposé au fond d'un puits axial débouchant dans la chambre aval, qui prolonge l'orifice reliant les chambres et est apte à loger l'excroissance dépassant du poussoir.This protrusion, in addition to its function of transmitting the movement of the pusher to the ball, is particularly well suited to the configuration that is the subject of the invention. Preferably, the hemispherical seat is in fact disposed at the bottom of an axial well opening into the downstream chamber, which extends the orifice connecting the chambers and is adapted to accommodate the projection protruding from the pusher.
L'existence du puits est rendue quasi nécessaire par les performances du dispositif de l'invention, qui aboutissent à mieux compenser l'action des moyens de rappel lorsque le débit augmente, ce qui peut impliquer un déplacement plus important du poussoir lorsqu'il s'écarte du siège de la bille.The existence of the well is made almost necessary by the performance of the device of the invention, which result in better compensating the action of the return means when the flow increases, which may involve a greater displacement of the pusher when s away from the seat of the ball.
Pour ne pas perdre la bille, il est alors important que l'excroissance axiale dépassant dudit poussoir plonge dans le puits mentionné, pour y maintenir la bille même lorsqu'elle s'éloigne du siège.Not to lose the ball, it is important that the axial protrusion beyond said pusher plunges into the mentioned well, to keep the ball even when it moves away from the seat.
Selon une alternative possible, l'excroissance axiale dépassant du poussoir et la bille sont d'une seule pièce.According to one possible alternative, the axial protrusion protruding from the pusher and the ball are in one piece.
Pour des raisons de fabrication, la chambre amont, l'orifice reliant les chambres amont et aval, ainsi que le siège des moyens d'obturation sont agencés dans une unique pièce fermant l'une des extrémités de la chemise.For manufacturing reasons, the upstream chamber, the orifice connecting the upstream and downstream chambers, and the seat of the closure means are arranged in a single piece closing one end of the jacket.
Cette pièce, fabriquée à part, est simplement fixée à l'une des extrémités de la chemise, obstruant l'alésage dans lequel coulisse le poussoir.This part, manufactured separately, is simply attached to one end of the jacket, obstructing the bore in which the slide pushes.
De préférence, les moyens de rappel consistent en un ressort de compression. Dans ce cas, les extrémités du ressort sont fixées sur deux plots axiaux dépassant respectivement du poussoir et d'un bouchon fermant l'extrémité de la chemise à l'opposé de la chambre à haute pression.Preferably, the return means consist of a compression spring. In this case, the ends of the spring are fixed on two axial studs respectively protruding from the pusher and a plug closing the end of the sleeve opposite the high pressure chamber.
En termes de fabrication, ledit bouchon obéit à la même logique que la pièce dans laquelle est réalisé le siège de la bille.In terms of manufacture, said cap obeys the same logic as the part in which the seat of the ball is made.
Selon une configuration préférentielle, la chambre aval comporte deux ouvertures d'échappement, comme déjà mentionné, qui permettent de renvoyer le fluide déchargé du circuit à haute pression vers par exemple un réservoir de carburant.According to a preferred configuration, the downstream chamber has two exhaust openings, as already mentioned, which make it possible to return the fluid discharged from the high-pressure circuit to for example a fuel tank.
L'invention va à présent être décrite en référence aux figures disposées en annexe, pour lesquelles :
- la
figure 1 représente le schéma général d'un système d'injection de carburant doté d'un limiteur de pression selon l'invention ; - la
figure 2 montre un limiteur de l'art antérieur, avec un agrandissement de la bille d'obturation et de son siège ; - la
figure 3 représente la courbe de la pression dans le circuit à haute pression en fonction du débit obtenue avec une telle configuration ; - la
figure 4 est une vue en coupe de la configuration qui fait l'objet de la présente invention ; et - la
figure 5 représente la courbe des pressions en fonction des débits obtenue avec cette nouvelle configuration.
- the
figure 1 represents the general diagram of a fuel injection system equipped with a pressure limiter according to the invention; - the
figure 2 shows a limiter of the prior art, with an enlargement of the ball shutter and its seat; - the
figure 3 represents the curve of the pressure in the high-pressure circuit as a function of the flow rate obtained with such a configuration; - the
figure 4 is a sectional view of the configuration which is the subject of the present invention; and - the
figure 5 represents the pressure versus flow curve obtained with this new configuration.
En référence à la
La pression du système est limitée, en cas de défaillance de l'un des composants de contrôle du circuit, par décharge du débit vers le drain de retour de la pompe (22). Cette décharge se fait dans le limiteur de pression (27) qui constitue l'invention. Le carburant ainsi évacué est renvoyé vers un réservoir (28).The system pressure is limited, in the event of failure of one of the circuit control components, by discharging the flow to the return drain of the pump (22). This discharge is done in the pressure limiter (27) which constitutes the invention. The fuel thus evacuated is returned to a reservoir (28).
Le limiteur de pression (27) est en l'occurrence un composant purement mécanique. Ceux qui sont utilisés aujourd'hui, dont un exemple est montré en
L'action du fluide à haute pression est symbolisée par la flèche P. Ce fluide est d'abord admis dans une chambre à haute pression amont (7) pratiquée dans la pièce (1), qui communique avec le siège (8) de la bille (voir agrandissement) via un orifice (9).The action of the fluid at high pressure is symbolized by the arrow P. This fluid is first admitted into an upstream high pressure chamber (7) made in the piece (1), which communicates with the seat (8) of the ball (see enlargement) via an orifice (9).
Le siège (8) de la bille (2) s'évase vers une chambre (10) aval délimitée par la paroi intérieure de la pièce (1), un des côtés du poussoir (3) et la paroi interne de la chemise (4).The seat (8) of the ball (2) flares towards a chamber (10) downstream delimited by the inner wall of the part (1), one side of the pusher (3) and the inner wall of the sleeve (4). ).
La bille (2), qui fait office de moyen d'obturation, est plaquée contre son siège (8) par une excroissance axiale (11) dépassant du poussoir (3). En position de fermeture de l'orifice (9), telle que représentée à la
Ce ressort (5) est centré à ses deux extrémités respectivement au poussoir (3) et au bouchon (6) par des plots axiaux (13, 14) qui en dépassent. Le fluide déchargé du circuit à haute pression vers la chambre aval (10) lorsque la bille (2) cesse d'obturer l'orifice (9) s'échappe à destination d'un réservoir, ce que symbolise la flèche T.This spring (5) is centered at its two ends respectively to the pusher (3) and the plug (6) by axial studs (13, 14) which protrude. The fluid discharged from the high pressure circuit to the downstream chamber (10) when the ball (2) stops closing the orifice (9) escapes to a reservoir, which symbolizes the arrow T.
Dans cette configuration, l'équilibre de la bille lors d'une phase de décharge est régi par la relation suivante :
- Avec : FRO : effort initial du ressort sur la bille ;
- KR : raideur du ressort ;
- Xb : levée de la bille ;
- Prail : pression du système ;
- ΔPhydrodynamique : diminution de pression au droit de la section de fermeture due à la mise en vitesse ;
- SF : section de fermeture.
- With: F RO : initial force of the spring on the ball;
- K R : spring stiffness;
- X b : lifting of the ball;
- P rail : system pressure;
- ΔP hydrodynamic : pressure decrease at the closing section due to speeding up;
- S F : closing section.
ΔPhydrodynamique dépend directement du débit et donc de la section de fermeture ainsi que de la levée de la bille.
La courbe caractéristique qui correspond à cette équation est celle qui apparaît en
Un tel fonctionnement n'est pas compatible avec l'exigence sécuritaire qui s'attache à ce type de dispositif.Such an operation is not compatible with the security requirement that attaches to this type of device.
La configuration modifiée qui fait l'objet de l'invention, et apparaît en
Dans cette nouvelle configuration, les numéros de référence ont été conservés lorsqu'ils s'appliquent à des composants ou éléments qui se trouvaient déjà dans la configuration de l'art antérieur.In this new configuration, the reference numbers have been retained when they apply to components or elements that were already in the configuration of the prior art.
Par rapport à cette dernière, les modifications majeures concernent le poussoir (3), le positionnement du siège (8) et l'existence d'une ouverture supplémentaire (15) dans le corps de la chemise (4).With respect to the latter, the major changes concern the pusher (3), the positioning of the seat (8) and the existence of an additional opening (15) in the body of the jacket (4).
Le poussoir (3), à présent dépourvu de passages axiaux pour le fluide, est de surcroît dimensionné de telle sorte que, lorsqu'il maintient la bille (2) contre son siège (8), il empiète sur les surfaces des ouvertures (12, 12'), créant ainsi une restriction hydraulique aux droits de ces ouvertures. Sous l'effet du débit de décharge, il se crée une surpression dans la chambre (10). L'ouverture (15), reliée à au moins une des ouvertures (12, 12'), impose sur le côté du poussoir (3) au niveau duquel elle débouche une pression identique à la pression du fluide en échappement telle qu'elle se trouve au niveau des ouvertures (12, 12').The pusher (3), now devoid of axial passages for the fluid, is further dimensioned so that, when it holds the ball (2) against its seat (8), it impinges on the surfaces of the openings (12). , 12 '), thus creating a hydraulic restriction to the rights of these openings. Under the effect of the discharge rate, an overpressure is created in the chamber (10). The opening (15), connected to at least one of the openings (12, 12 '), imposes on the side of the pusher (3) at which it opens a pressure identical to the pressure of the exhaust fluid as it is located at the openings (12, 12 ').
Les deux sections transversales opposées du poussoir (3) reçoivent donc une pression différente. Ce différentiel crée sur le poussoir (3) un effort qui tend à s'opposer à l'action du ressort, et permet de diminuer, en fonction du débit de décharge, la charge du ressort (5) sur la bille (2).The two opposite cross sections of the pusher (3) therefore receive a different pressure. This differential creates on the pusher (3) a force that tends to oppose the action of the spring, and reduces, depending on the discharge rate, the load of the spring (5) on the ball (2).
Dans ce cas, l'effort que reçoit la bille (2) du poussoir (3) est :
- Avec : FRO : effort initial du ressort sur la bille ;
- KR : raideur du ressort ;
- Xb : levée de la bille ;
- PA : pression différentielle dans la chambre (10) générée par le recouvrement poussoir/corps ;
- Sp : section du poussoir.
- With: F RO : initial force of the spring on the ball;
- K R : spring stiffness;
- X b : lifting of the ball;
- P A : differential pressure in the chamber (10) generated by the pusher / body cover;
- S p : section of the pusher.
Avec βA=PA(Xb)xSP, fonction de la pression dans la chambre aval (10) générée par le débit de décharge.With βA = P A (X b) xS P, depending on the pressure in the downstream chamber (10) generated by the discharge rate.
La nouvelle valeur de Prail aboutit à une courbe caractéristique de pression dans le rail en fonction du débit telle que représentée en
Il apparaît dès lors clairement que la nouvelle configuration permet de diminuer la pression dans le circuit de haute pression même lorsque les débits augmentent, ce qui est fidèle à la finalité du produit.It is therefore clear that the new configuration reduces the pressure in the high pressure circuit even when the flow increases, which is true to the purpose of the product.
Compte tenu du différentiel de pression qui existe entre la chambre aval (10) et le côté du poussoir (3) coopérant avec le ressort (5), le déplacement dudit poussoir (3) peut être sensiblement plus important que dans les versions de l'art antérieur. Afin de ne pas perdre la bille (2), son siège (8) a alors été disposé au fond d'un puits (16) qui guide et centre au surplus l'excroissance (11) dépassant du poussoir (3) au moment de la fabrication. L'excroissance (11) empêche dans tous les cas la sortie de la bille (2).Given the differential pressure that exists between the downstream chamber (10) and the side of the pusher (3) cooperating with the spring (5), the displacement of said pusher (3) can be substantially greater than in the versions of the prior art. In order not to lose the ball (2), its seat (8) was then placed at the bottom of a well (16) which guides and centers surplus the protrusion (11) protruding from the pusher (3) at the time of the making. The protrusion (11) prevents in any case the output of the ball (2).
La configuration de l'invention permet notamment une réduction importante des dimensions du limiteur de l'invention. Elle ne constitue cependant qu'un exemple possible de mise en oeuvre de l'invention.The configuration of the invention allows in particular a significant reduction in the dimensions of the limiter of the invention. However, it is only one possible example of implementation of the invention.
Claims (7)
- Pressure limiter (27) that can be used in a high-pressure fluid circuit in order to limit the pressure in the event of failure of one of the components of the circuit, consisting of a sleeve (4) inside which there slides a plunger (3) axially urged by return means (5) and actuating shut-off means (2) that shut off an orifice (9) causing an upstream high-pressure fluid intake chamber (7) to communicate with a downstream chamber (10) delimited by the sleeve (4), one side of the plunger (3) and the pierced wall of the said orifice (9), the said downstream chamber (10) comprising at least one fluid exhaust opening (12, 12') and the shut-off means (2) being kept by the return means (5) in a position in which they shut off the orifice (9) below a predetermined threshold pressure in the upstream chamber (7), the plunger (3) having no axial passageways for the fluid and sliding with a small functional clearance in the sleeve (4), characterized in that it is dimensioned to partially obstruct each exhaust opening (12, 12'), at least one of which is connected to an opening (15) likewise made in the sleeve (4) and at least partially opening onto the opposite side of the plunger (3), the shut-off means consisting of a ball (2) lodged in a hemispherical seat (8) the bottom of which is pierced with the orifice (9) that provides the communication between the upstream (7) and downstream (10) chambers, the said ball (2) interacting with a protrusion (11) extending axially beyond the plunger (3) and which applies an axially directed action to the ball (2).
- Pressure limiter (27) according to the preceding claim, characterized in that the hemispherical seat (8) is positioned in the bottom of an axial well opening into the downstream chamber (10), which extends the orifice (9) that connects the chambers (7, 10) and is able to house the protrusion (11) extending beyond the plunger (3).
- Pressure limiter (27) according to one of Claims 1 and 2, characterized in that the axial protrusion (11) extending beyond the plunger (3) and the ball (2) are made as a single piece.
- Pressure limiter (27) according to one of Claims 1 to 3, characterized in that the upstream chamber (7), the orifice (9) that connects the upstream (7) and downstream (10) chambers and the seat (8) of the shut-off means (2) are arranged in a component (1) that closes off one of the ends of the sleeve (4).
- Pressure limiter (27) according to any one of the preceding claims, characterized in that the return means consist of a compression spring (5).
- Pressure limiter (27) according to the preceding claim, characterized in that the ends of the spring (5) are fixed to two axial blocks (13, 14) which respectively protrude from the plunger (3) and from an end cap (6) that closes the end of the sleeve (4) at the opposite end to the high-pressure chamber (7).
- Pressure limiter (27) according to any one of the preceding claims, characterized in that the downstream chamber (10) comprises two exhaust openings (12, 12').
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0506064A FR2887319B1 (en) | 2005-06-15 | 2005-06-15 | PRESSURE LIMITER |
PCT/FR2006/001331 WO2006134264A1 (en) | 2005-06-15 | 2006-06-13 | Pressure relief device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1902214A1 EP1902214A1 (en) | 2008-03-26 |
EP1902214B1 true EP1902214B1 (en) | 2011-06-01 |
Family
ID=35784708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060764780 Not-in-force EP1902214B1 (en) | 2005-06-15 | 2006-06-13 | Pressure relief device |
Country Status (6)
Country | Link |
---|---|
US (1) | US8245725B2 (en) |
EP (1) | EP1902214B1 (en) |
CN (1) | CN101313143B (en) |
AT (1) | ATE511603T1 (en) |
FR (1) | FR2887319B1 (en) |
WO (1) | WO2006134264A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9194352B2 (en) * | 2012-10-25 | 2015-11-24 | Caterpillar Inc. | Pressure relief valve for common rail fuel system |
CN103115149B (en) * | 2013-01-30 | 2015-11-25 | 中国北方车辆研究所 | Large discharge piezoelectricity direct acting hydraulic pressure reducing device |
CN103277548B (en) * | 2013-05-31 | 2015-09-02 | 龙口龙泵燃油喷射有限公司 | A kind of common rail pipe protection valve |
CN106194129B (en) * | 2015-05-07 | 2019-06-11 | 中国石油天然气股份有限公司 | Perforation tubular column |
CN106285575B (en) * | 2015-05-11 | 2019-02-15 | 中国石油天然气股份有限公司 | Perforation tubular column |
GB2571284A (en) * | 2018-02-22 | 2019-08-28 | Delphi Tech Ip Ltd | Pressure limiting valve |
US11434900B1 (en) * | 2022-04-25 | 2022-09-06 | Vulcan Industrial Holdings, LLC | Spring controlling valve |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3195556A (en) * | 1962-12-26 | 1965-07-20 | Britt Tech Corp | Pressure relief valve for controlling pump |
USRE28842E (en) * | 1971-07-06 | 1976-06-08 | Spraying Systems Co. | Unloader valve for spray guns |
US4062336A (en) * | 1975-05-19 | 1977-12-13 | Cummins Engine Company, Inc. | Fuel control valve |
US4736083A (en) * | 1985-02-19 | 1988-04-05 | Savillex Corporation | Microwave heating digestion vessel |
US4721289A (en) * | 1985-07-23 | 1988-01-26 | Rantom, Inc. | Combined check and exhaust valve for high pressure gas spring |
US4706705A (en) * | 1986-04-01 | 1987-11-17 | The Lee Company | Check valve |
US5170818A (en) * | 1991-11-25 | 1992-12-15 | Westinghouse Air Brake Company | Safety valve |
DE19822671A1 (en) * | 1998-05-20 | 1999-11-25 | Bosch Gmbh Robert | Pressure limiting valve for internal combustion engine |
US6622752B2 (en) * | 2000-06-16 | 2003-09-23 | Bosch Automotive Systems Corporation | Pressure relief valve |
DE10059425A1 (en) * | 2000-11-30 | 2002-06-06 | Bosch Gmbh Robert | Fuel injection pump for internal combustion engines, in particular diesel engines |
DE10118936A1 (en) * | 2001-04-18 | 2002-11-07 | Bosch Gmbh Robert | Pressure limiting device and fuel system with such a pressure limiting device |
JP4152814B2 (en) * | 2003-01-17 | 2008-09-17 | 株式会社ショーワ | Relief valve |
-
2005
- 2005-06-15 FR FR0506064A patent/FR2887319B1/en not_active Expired - Fee Related
-
2006
- 2006-06-13 AT AT06764780T patent/ATE511603T1/en not_active IP Right Cessation
- 2006-06-13 US US11/922,081 patent/US8245725B2/en not_active Expired - Fee Related
- 2006-06-13 EP EP20060764780 patent/EP1902214B1/en not_active Not-in-force
- 2006-06-13 WO PCT/FR2006/001331 patent/WO2006134264A1/en active Application Filing
- 2006-06-13 CN CN2006800216601A patent/CN101313143B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE511603T1 (en) | 2011-06-15 |
EP1902214A1 (en) | 2008-03-26 |
WO2006134264A8 (en) | 2008-09-25 |
FR2887319B1 (en) | 2007-09-28 |
CN101313143B (en) | 2012-11-07 |
CN101313143A (en) | 2008-11-26 |
US8245725B2 (en) | 2012-08-21 |
WO2006134264A1 (en) | 2006-12-21 |
FR2887319A1 (en) | 2006-12-22 |
US20090217989A1 (en) | 2009-09-03 |
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