EP0333960A1 - Hydraulic stopping device for a thermo-hydraulic generator - Google Patents

Hydraulic stopping device for a thermo-hydraulic generator Download PDF

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Publication number
EP0333960A1
EP0333960A1 EP88400736A EP88400736A EP0333960A1 EP 0333960 A1 EP0333960 A1 EP 0333960A1 EP 88400736 A EP88400736 A EP 88400736A EP 88400736 A EP88400736 A EP 88400736A EP 0333960 A1 EP0333960 A1 EP 0333960A1
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EP
European Patent Office
Prior art keywords
valve
pressure
return
main
battery
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.)
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Application number
EP88400736A
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German (de)
French (fr)
Inventor
Henri Mathiolon
Antonio Moretti
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.)
Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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Priority to FR8614780A priority Critical patent/FR2605678B3/en
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to EP88400736A priority patent/EP0333960A1/en
Publication of EP0333960A1 publication Critical patent/EP0333960A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/02—Starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the present invention relates to thermohydraulic generators with free pistons in which the thermal piston is directly associated with a double piston, one of which, during thermal expansion, provides the main pumping with valve box to a main hydraulic battery while the another, reversibly pumping without a valve to another hydraulic battery called "return", ensures the return of the moving element to the thermal compression dead center, any shocks, in this case, being protected by a dash-pot.
  • the thermal piston 1 the cylinder head 2, the fuel injector 3, the intake 4, the transfer 5, the diagram showing for example a two-stroke with lights and pump housing.
  • the light 6 allows the exhaust, the pump housing being noted 7.
  • the central piston 17 of the composite piston 8 slides in the cylinder 10 and delivers without valve in the oleopneumatic accumulator 18, the combined action of the battery 18 and of the piston 17 allowing the thermal piston to return to compression .
  • FIG 2 shows the components 1 to 22 of Figure 1 but it is supplemented with the elements which characterize the invention in the case where the stopping of the machine is controlled.
  • the invention implements the combination of the following means:
  • This operates in reverse of the main, in connection with the cavity 25, which is connected during normal operation of the generator, to the suction 13 of the main pumping by the valve 26 hydraulically controlled by the external pressure which l tackles.
  • fig. 2 shows the components of the invention in the arrangement where the stopping of the machine is controlled.
  • the same valve 26, when controlled as illustrated, carries the cavity 25, therefore the auxiliary pumping cylinder, to the pressure of the "return" accumulator 18 when the valve 26 is served by said pressure.
  • a controlled valve 27 is interposed between the return piston 17 and the return battery 18. It is normally passing under the effect of the pressure of said battery which pushes the main surface of this valve, which compresses the spring. 28 which, without pressure, would close the valve.
  • FIG. 2 shows that this action brings the control of the valve 26 to the same pressure of the return battery, which controls it and puts at this said pressure the cavity 25 of the auxiliary pumping.
  • Two controlled valves 30 and 31 press tank pressure, or very low, respectively the return pumping cylinder 10 and the main valve box 12. They perform these functions when they are controlled, being at rest during operation normal machine. Between the valve 31 and the valve box 12 a calibrated spring 32, whose setting pressure is a little higher than the booster pressure applied to the main suction 13, prevents a loss of hydraulic fluid to the tank when this valve 31 is ordered.
  • Fig. 2 shows the valve 31 at rest because, as will be explained below, its control is only operated at the end of the machine stop stroke.
  • combustion Shortly before the compression neutral point, combustion is established, can contribute to the final braking phase and pushes the moving part towards the trigger by jointly compressing the main cylinder 24 by the piston 11 which inflates the main battery 15 and the return cylinder 18 by the piston 17, in preparation for the following alternation.
  • valve 29 is controlled carrying the cover pressure the control piston of the piloted valve 27 which opens under the action of the pressure of the storage battery.
  • return 18 while the valve 26, which also receives the tank pressure, is in the rest position and connects the auxiliary pumping by its cavity 25 to the main suction 13.
  • This small displacement auxiliary pumping sends small volumes to 13 and these exchanges fade in front of the main suction.
  • valves 30 and 31 close, being at rest, the main and auxiliary cylinders.
  • valve 29 is put to rest from which it follows the pressurization by the return battery 18 of the piston controlled valve 27.
  • the latter under this action, and the parallel action of its spring 28, tend to close progressively.
  • said pressure of the return battery 18 reaches the controlled valve 26, controls it and reaches the cavity 25 of the auxiliary pumping.
  • This contributes to accelerating the return of the moving element to the detent dead center, compensating for the pressure drop and the correlative brake force caused by the control of the valve 27. It is indeed clear that, while being controlled, the valve 27 does not close completely until the end of the expansion stroke of the movable assembly, this at the cost of an overpressure that more than compensates for the action of the return pressure on the auxiliary pumping.
  • the two valves 30 and 31 are controlled carrying, at low pressure, the main and return cylinders, preventing any rebound.
  • the restart being decided, it is obtained by the game of the reverse maneuvers: the valves 30 and 31 are put at rest, which isolates from the tarpaulin the main and auxiliary cylinders, the valve 29 is ordered carrying the tarpaulin piston pressure control of the valve 27 and, at the same time, the valve 26. It follows that, under the action of the return pressure on the thrust ring, the valve 27 opens very quickly while the pressure of the suction 13 is established in the cavity 25 and the auxiliary pumping all conditions which allow the starting of the moving equipment for a sequence of operation.
  • the opening of the valve 27 is so rapid that it practically eliminates the loss of rolling energy and, therefore, the first start can be considered to be comparable to the following.
  • the determining action of the valve 29 on the opening of the valve 27 can be advantageously accelerated by the choice of a two-stage piloted valve as is known.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

This device has the following three arrangements: - a main piston (11) provides for auxiliary pumping, - a pilot controlled check valve (27) inserted between a return piston (17) and a return accumulator (18) is normally opened by the return pressure which it transmits whilst the generator is running, - two controlled slide valves (30) and (31) carry the main cylinder (24) and auxiliary cylinder (10) at the end of expansion, at low pressure. Application: in particular to thermo-hydraulic generators. <IMAGE>

Description

La présente invention se rapporte aux générateurs thermo­hydrauliques à pistons libres dans lesquels le piston thermique est directement associé à un piston double dont l'un, pendant la détente thermique, assure le pompage principal avec boîte à clapets vers un accu hydraulique principal alors que l'autre, pompant réversiblement sans clapet vers un autre accu hydrau­lique dit "de retour", assure le retour de l'équipage mobile vers le point mort de compression thermique, les éventuels chocs, en ce cas, étant protégés par un dash-pot.The present invention relates to thermohydraulic generators with free pistons in which the thermal piston is directly associated with a double piston, one of which, during thermal expansion, provides the main pumping with valve box to a main hydraulic battery while the another, reversibly pumping without a valve to another hydraulic battery called "return", ensures the return of the moving element to the thermal compression dead center, any shocks, in this case, being protected by a dash-pot.

On connaît de nombreux générateurs hydrauliques mus par moteur thermique à pistons libres, ces derniers étant le plus souvent du type Diesel. Le brevet français 80.17288, publié sous le numéro 2.488.344, en décrit une configuration nouvelle où l'équipage mobile comprenant pistons thermique et hydraulique associés peuvent être verrouillés en fin de course de détente thermique.Many hydraulic generators are known to be powered by a free piston thermal engine, the latter being most often of the Diesel type. French patent 80.17288, published under the number 2,488,344, describes a new configuration in which the movable assembly comprising associated thermal and hydraulic pistons can be locked at the end of thermal expansion stroke.

Une telle disposition offre d'évidence l'avantage de fournir l'énergie par nombres entiers délibérés de courses motrices sans souffrir des mauvais rendements liés aux marches en ralenti.Such an arrangement obviously offers the advantage of supplying energy by deliberate whole numbers of motor races without suffering from the poor yields associated with idling.

Le remplissage d'un accu hydropneumatique par une telle machine se prête en outre à des automatismes simples à compter du moment où la machine démarre en réponse à une pression seuil basse, et s'arrête ensuite lors de la détection d'une pression seuil haute.The filling of a hydropneumatic battery by such a machine also lends itself to simple automatisms from the moment the machine starts in response to a low threshold pressure, and then stops when a high threshold pressure is detected. .

Il va sans dire que tous les gains de rendement envisagés imposent que la machine soit dotée de moyens fiables et rapides assurant les arrêts et démarrages envisagés, ce qui fait l'objet de la présente invention. Elle sera décrite à partir du schéma simplifié de la machine faisant l'objet du brevet cité, ci-avant en fig. 1, et du même schéma complété des moyens de l'invention, fig. 2 présentés en position d'arrêt commandé.It goes without saying that all the efficiency gains envisaged require that the machine be provided with reliable and rapid means ensuring the planned stops and starts, which makes the object of the present invention. It will be described from the simplified diagram of the machine which is the subject of the cited patent, above in FIG. 1, and of the same diagram supplemented with the means of the invention, FIG. 2 presented in the commanded stop position.

Il faut tout d'abord signaler que tous les brevets mentionnant un verrouillage au point mort de détente thermique de l'équi­page mobile de ces machines ne donnaient pas le détail pratique de ces verrous qui doivent intervenir vite (en quelques dixièmes de millisecondes), supporter des efforts de plusieurs centaines de kilos et durer plusieurs centaines de millions de manoeuvres.It should first of all be pointed out that all the patents mentioning a dead center thermal expansion lock for the moving equipment of these machines did not give the practical details of these locks which must intervene quickly (in a few tenths of a millisecond), withstand efforts of several hundred kilos and last several hundred million maneuvers.

On reconnaît en fig. 1, le piston thermique 1, la culasse 2, l'injecteur de combustible 3, l'admission 4, le transfert 5, le schéma présentant pour exemple un deux temps à lumières et carter pompe. La lumière 6 permet l'échappement, le carter pompe étant noté 7.We recognize in fig. 1, the thermal piston 1, the cylinder head 2, the fuel injector 3, the intake 4, the transfer 5, the diagram showing for example a two-stroke with lights and pump housing. The light 6 allows the exhaust, the pump housing being noted 7.

Directement relié au piston thermique 1, on voit le piston composite 8 coopérant avec la chemise 9, sa couronne 11 formant piston principal relié à la chapelle 12 où débouchent l'aspiration 13 et le refoulement 14, lequel conduit à l'accumulateur principal 15 qui dessert l'utilisation par le conduit 16.Directly connected to the thermal piston 1, we see the composite piston 8 cooperating with the jacket 9, its crown 11 forming the main piston connected to the chapel 12 where the suction 13 and the discharge 14 open, which leads to the main accumulator 15 which serves use via line 16.

De son côté, le piston central 17 du piston composite 8 coulisse dans le cylindre 10 et refoule sans clapet dans l'accumulateur oléopneumatique 18, l'action conjuguée de l'accu 18 et du piston 17 permettant de retourner le piston thermique vers la compression.For its part, the central piston 17 of the composite piston 8 slides in the cylinder 10 and delivers without valve in the oleopneumatic accumulator 18, the combined action of the battery 18 and of the piston 17 allowing the thermal piston to return to compression .

Il reste que les accus 15 et 18 peuvent être isolés par les vannes 21 et 22 pour isolement à l'arrêt et que la cuvette 20, coopérant avec le manchon 19 fixé sur le piston 17 forment dash-pot de sécurité amortissant l'ensemble mobile en cas d'une combustion trop énergétique.The fact remains that the batteries 15 and 18 can be isolated by the valves 21 and 22 for shutdown isolation and that the bowl 20, cooperating with the sleeve 19 fixed on the piston 17 form safety dash-pot damping the mobile assembly in the event of excessive energy combustion.

Le verrou qui figurait très schématiquement sur le brevet cité n'est pas figuré car la fonction est l'objet même de la présente invention qui emploie à cette fin des moyens hydrauliques.The lock which appeared very schematically on the cited patent is not shown because the function is the very object of the present invention which employs for this purpose hydraulic means.

La figure 2 reprend les composants 1 à 22 de la figure 1 mais elle est complétée des éléments qui caractérisent l'invention dans le cas où l'arrêt de la machine est commandé.Figure 2 shows the components 1 to 22 of Figure 1 but it is supplemented with the elements which characterize the invention in the case where the stopping of the machine is controlled.

L'invention met en oeuvre la combinaison des moyens suivants :The invention implements the combination of the following means:

1°) Un second collet 23, agrandissant le piston 8, en coopération avec l'élargissement 24 de la chemise 9, forme toujours le pompage principal par la couronne frontale 11 mais ajoute aussi par sa couronne arrière repérée par le même signe 23, un pompage auxiliaire. Celui-ci fonctionne à l'inverse du principal, en liaison avec la cavité 25, laquelle se trouve raccordée lors du fonctionnement normal du générateur, à l'aspiration 13 du pompage principal par la vanne 26 à commande hydraulique par la pression extérieure qui l'aborde. Comme indiqué, la fig. 2 représente les composants de l'invention dans la disposition où l'arrêt de la machine est commandé. Aussi, la même vanne 26, lorsqu'elle est commandée comme figuré, porte la cavité 25, donc le cylindre de pompage auxiliaire, à la pression de l'accumulateur "de retour" 18 lorsque la vanne 26 est desservie par ladite pression.1 °) A second collar 23, enlarging the piston 8, in cooperation with the enlargement 24 of the jacket 9, still forms the main pumping by the front crown 11 but also adds by its rear crown marked with the same sign 23, a auxiliary pumping. This operates in reverse of the main, in connection with the cavity 25, which is connected during normal operation of the generator, to the suction 13 of the main pumping by the valve 26 hydraulically controlled by the external pressure which l tackles. As shown, fig. 2 shows the components of the invention in the arrangement where the stopping of the machine is controlled. Also, the same valve 26, when controlled as illustrated, carries the cavity 25, therefore the auxiliary pumping cylinder, to the pressure of the "return" accumulator 18 when the valve 26 is served by said pressure.

2°) Un clapet commandé 27 est interposé entre le piston de retour 17 et l'accu de retour 18. Il est normalement passant sous l'effet de la pression dudit accu qui pousse la surface principale de ce clapet, ce qui comprime le ressort 28 qui, sans pression, fermerait le clapet.2) a controlled valve 27 is interposed between the return piston 17 and the return battery 18. It is normally passing under the effect of the pressure of said battery which pushes the main surface of this valve, which compresses the spring. 28 which, without pressure, would close the valve.

S'il est soumis, à l'opposé de son cône de fermeture à la pression de l'accu de retour agissant sur son piston de commande, ceci conjointement à son ressort 28, ce même clapet peut le fermer progressivement, interdisant le transfert de fluide depuis l'accu 18 vers le cylindre 10 du piston 17. La fig. 2 montre que cette action porte la commande de la vanne 26 à la même pression de l'accu de retour, ce qui la commande et met à cette dite pression la cavité 25 du pompage auxiliaire.If it is subjected, opposite its closing cone to the pressure of the return battery acting on its control piston, this together with its spring 28, this same valve can close it gradually, preventing the transfer of fluid from the battery 18 towards the cylinder 10 of the piston 17. FIG. 2 shows that this action brings the control of the valve 26 to the same pressure of the return battery, which controls it and puts at this said pressure the cavity 25 of the auxiliary pumping.

C'est la vanne commandée 29, associée au clapet 17, qui, au repos, dirige la pression de retour vers la commande du clapet 27. Il faut donc qu'elle soit commandée pour permettre le fonctionnement normal de la machine, c'est une sécurité.It is the controlled valve 29, associated with the valve 17, which, at rest, directs the return pressure towards the control of the valve 27. It must therefore be controlled to allow normal operation of the machine, this is security.

3°) Deux vannes commandées 30 et 31 mettent à pression bâche, ou très faible, respectivement le cylindre de pompage de retour 10 et la boîte à clapet principale 12. Elles assurent ces fonctions lorsqu'elles sont commandées, étant au repos pendant la marche normale de la machine. Entre la vanne 31 et la boîte à clapet 12 un ressort taré 32, dont la pression de tarage est un peu supérieure à la pression de gavage appliquée à l'aspiration principale 13, empêche une perte de fluide hydraulique vers la bâche quand cette vanne 31 est commandée. La fig. 2 présente la vanne 31 au repos du fait que, ce sera exposé ci-après, sa commande n'est opérée qu'à la fin de la course d'arrêt de la machine.3 °) Two controlled valves 30 and 31 press tank pressure, or very low, respectively the return pumping cylinder 10 and the main valve box 12. They perform these functions when they are controlled, being at rest during operation normal machine. Between the valve 31 and the valve box 12 a calibrated spring 32, whose setting pressure is a little higher than the booster pressure applied to the main suction 13, prevents a loss of hydraulic fluid to the tank when this valve 31 is ordered. Fig. 2 shows the valve 31 at rest because, as will be explained below, its control is only operated at the end of the machine stop stroke.

Le fonctionnement général du thermogénérateur hydraulique auquel s'applique l'invention est connu : libéré depuis son point mort de détente, l'équipage mobile est poussé vers la compression par l'action de la pression de l'accu de retour 18 sur le piston 17.The general operation of the hydraulic thermogenerator to which the invention applies is known: released from its detent break-even point, the moving assembly is pushed towards compression by the action of the pressure of the return battery 18 on the piston 17.

Peu avant le point mort de compression, la combustion s'établit, peut contribuer à la phase finale de freinage et repousse l'équipage mobile vers la détente en comprimant conjointement le cylindre principal 24 par le piston 11 qui gonfle l'accu principal 15 et le cylindre de retour 18 par le piston 17, en préparation de l'alternance suivante.Shortly before the compression neutral point, combustion is established, can contribute to the final braking phase and pushes the moving part towards the trigger by jointly compressing the main cylinder 24 by the piston 11 which inflates the main battery 15 and the return cylinder 18 by the piston 17, in preparation for the following alternation.

Pendant cette marche normale, les composants de l'invention n'apportent aucune gêne : la vanne 29 est commandée portant à pression bâche le piston de commande du clapet piloté 27 qui s'ouvre sous l'action de la pression de l'accu de retour 18 alors que la vanne 26, qui reçoit aussi la pression bâche, est en position repos et relie le pompage auxiliaire par sa cavité 25 à l'aspiration principale 13. Ce pompage auxiliaire de faible cylindrée envoie de faibles volumes vers 13 et ces échanges s'effacent devant l'aspiration principale.During this normal operation, the components of the invention do not cause any discomfort: the valve 29 is controlled carrying the cover pressure the control piston of the piloted valve 27 which opens under the action of the pressure of the storage battery. return 18 while the valve 26, which also receives the tank pressure, is in the rest position and connects the auxiliary pumping by its cavity 25 to the main suction 13. This small displacement auxiliary pumping sends small volumes to 13 and these exchanges fade in front of the main suction.

De leur côté, les vannes 30 et 31 ferment, étant au repos, les cylindres principal et auxiliaire.For their part, the valves 30 and 31 close, being at rest, the main and auxiliary cylinders.

Si un arrêt de la machine est décidé, la décision pouvant être prise jusqu'au début de la détente, la vanne 29 est mise au repos d'où il découle la mise sous pression par l'accu de retour 18 du piston de commande du clapet commandé 27. Ce dernier, sous cette action, et celle parallèle de son ressort 28, tendent à se fermer progressivement.If a stop of the machine is decided, the decision being able to be taken until the start of the expansion, the valve 29 is put to rest from which it follows the pressurization by the return battery 18 of the piston controlled valve 27. The latter, under this action, and the parallel action of its spring 28, tend to close progressively.

Dans le même temps, ladite pression de l'accu de retour 18 parvient à la vanne commandée 26, la commande et atteint la cavité 25 du pompage auxiliaire. Celui-ci concourt à accélérer le retour de l'équipage mobile vers le point mort de détente, compensant la perte de charge et l'effort de frein corrélatif que provoque la commande du clapet 27. Il est en effet clair que, tout en étant commandé, le clapet 27 ne se ferme complè­tement qu'en fin de la course de détente de l'équipage mobile, ceci au prix d'une surpression que compense largement l'action de la pression de retour sur le pompage auxiliaire.At the same time, said pressure of the return battery 18 reaches the controlled valve 26, controls it and reaches the cavity 25 of the auxiliary pumping. This contributes to accelerating the return of the moving element to the detent dead center, compensating for the pressure drop and the correlative brake force caused by the control of the valve 27. It is indeed clear that, while being controlled, the valve 27 does not close completely until the end of the expansion stroke of the movable assembly, this at the cost of an overpressure that more than compensates for the action of the return pressure on the auxiliary pumping.

Près du point mort de détente, les deux vannes 30 et 31 sont commandées portant, à pression faible, les cylindres principal et de retour, évitant tout rebond.Near the trigger dead center, the two valves 30 and 31 are controlled carrying, at low pressure, the main and return cylinders, preventing any rebound.

De cette sorte, en fin de course de détente, l'équipage mobile est appliqué sur son dash-pot 20 alors que la pression de retour est bloquée par le clapet 27. Cette position est stable et peut être gardée un temps quelconque.In this way, at the end of the expansion stroke, the mobile assembly is applied to its dash-pot 20 while the return pressure is blocked by the valve 27. This position is stable and can be kept for any time.

Le redémarrage étant décidé, il s'obtient par le jeu des manoeuvres inverses : les vannes 30 et 31 sont mises au repos, ce qui isole de la bâche les cylindres principal et auxiliaire, la vanne 29 est commandée portant à pression bâche le piston de commande du clapet 27 et, dans le même temps, la vanne 26. Il en découle que, sous l'action de la pression de retour sur la couronne de poussée, le clapet 27 s'ouvre très rapidement alors que la pression de l'aspiration 13 s'établit dans la cavité 25 et le pompage auxiliaire toutes conditions qui permettent le démarrage de l'équipage mobile pour une séquence de fonctionnement.The restart being decided, it is obtained by the game of the reverse maneuvers: the valves 30 and 31 are put at rest, which isolates from the tarpaulin the main and auxiliary cylinders, the valve 29 is ordered carrying the tarpaulin piston pressure control of the valve 27 and, at the same time, the valve 26. It follows that, under the action of the return pressure on the thrust ring, the valve 27 opens very quickly while the pressure of the suction 13 is established in the cavity 25 and the auxiliary pumping all conditions which allow the starting of the moving equipment for a sequence of operation.

Il faut signaler que l'ouverture du clapet 27 est si rapide qu'elle supprime pratiquement la perte d'énergie de laminage et, de ce fait, le premier démarrage peut être considéré comme comparable aux suivants. L'action déterminante de la vanne 29 sur l'ouverture du clapet 27 peut être avantageusement accélérée par le choix d'une vanne pilotée à deux étages comme il est connu.It should be noted that the opening of the valve 27 is so rapid that it practically eliminates the loss of rolling energy and, therefore, the first start can be considered to be comparable to the following. The determining action of the valve 29 on the opening of the valve 27 can be advantageously accelerated by the choice of a two-stage piloted valve as is known.

On peut aussi noter que la même séquence de mise au repos de l'équipage mobile peut être appliquée, même si l'équipage mobile s'était arrêté en cours de la course de détente du fait d'une quelconque anomalie, absence d'injection par exemple.It may also be noted that the same sequence of putting the mobile equipment to rest can be applied, even if the mobile equipment had stopped during the detent race due to any anomaly, absence of injection for example.

De même, si le démarrage n'avait pas lieu du premier coup, il est aisé d'automatiser le processus de retour et de redémarrage immédiatement consécutif, ceci jusqu'au démarrage complet, toutes opérations qui remplacent l'action d'un démarreur habituel de moteur, quel que soit le type de combustion, explosion ou allumage par compression.Similarly, if the start-up did not take place the first time, it it is easy to automate the immediately consecutive return and restart process, until complete start, all operations which replace the action of a usual starter motor, regardless of the type of combustion, explosion or compression ignition .

Il va sans dire que la précédente description est non limi­tative, les positions des vannes commandées ou au repos en marche normale pouvant être inversées, lesdites vannes pouvant être remplacées par des dispositifs équivalents sans pour autant sortir du cadre de la présente invention.It goes without saying that the preceding description is non-limiting, the positions of the valves controlled or at rest in normal operation can be reversed, said valves being able to be replaced by equivalent devices without departing from the scope of the present invention.

Claims (5)

1 - Dispositif d'arrêt et de redémarrage rapide d'un thermo­générateur hydraulique, caractérisé par l'emploi en combinaison des dispositions suivantes :
- le piston principal comporte, côté pompage, un collet élargi (23) conjugué à une étanchéité sur un diamètre intérieur (9) de façon à constituer un pompage auxiliaire (25) dont le fonctionnement est en opposition du principal, ce pompage auxiliaire étant relié à l'aspiration principale (13) en marche normale, et à l'accu de retour (18) lorsqu'un arrêt est commandé, ceci par le jeu d'une vanne commandée (26) ;
- un clapet piloté (27), inséré entre le piston de retour (17) et l'accu de retour (18), est normalement ouvert par la pression de retour qu'il transmet pendant la marche du générateur, laquelle agit sur sa couronne de poussée et s'oppose à son ressort de fermeture (28), il comporte en arrière un cylindre de commande agissant parallèlement au ressort (28), ce cylindre étant porté à pression bâche en marche normale et à la pression de l'accu (18) lorsqu'un arrêt est décidé, ces opérations étant obtenues par le jeu d'une vanne commandée (29) qui déclenche la séquence d'arrêt. En même temps que le clapet (27), la même vanne (29) porte à la pression de l'accu de retour (18) le pompage auxiliaire (25) à travers la vanne (26) mentionnée ci-avant ;
- Deux vannes commandées (31) et (30) portent, en fin de détente, à pression basse, les cylindres principal (24) et auxiliaire (10), la première à la pression de l'aspiration (13), interposant entre cette aspiration (13) et la bâche un clapet taré légèrement au-dessus, l'autre par simple liaison à la bâche.1 - Device for quickly stopping and restarting a hydraulic thermogenerator, characterized by the use in combination of the following provisions:
- The main piston comprises, on the pumping side, an enlarged collar (23) combined with a seal on an internal diameter (9) so as to constitute an auxiliary pump (25) whose operation is in opposition to the main, this auxiliary pumping being connected to the main suction (13) in normal operation, and to the return battery (18) when a stop is commanded, this by the play of a controlled valve (26);
- a piloted valve (27), inserted between the return piston (17) and the return battery (18), is normally opened by the return pressure which it transmits during the running of the generator, which acts on its crown thrust and opposes its closing spring (28), it comprises behind a control cylinder acting parallel to the spring (28), this cylinder being brought to tarpaulin pressure in normal operation and to the pressure of the battery ( 18) when a stop is decided, these operations being obtained by the play of a controlled valve (29) which triggers the stop sequence. At the same time as the valve (27), the same valve (29) carries the pressure of the return battery (18) the auxiliary pumping (25) through the valve (26) mentioned above;
- Two controlled valves (31) and (30) carry, at the end of expansion, at low pressure, the main (24) and auxiliary (10) cylinders, the first at the suction pressure (13), interposing between this suction (13) and the tarp a tared valve slightly above, the other by simple connection to the tarpaulin. 2 - Dispositif suivant la revendication 1 caractérisé en ce qu'il est soumis à la même séquence d'arrêt du générateur dont l'équipage mobile est arrêté en cours de course, ramenant ainsi ce dernier au point mort de détente thermique.2 - Device according to claim 1 characterized in that it is subjected to the same sequence of stopping the generator, the moving assembly of which is stopped during the race, thus bringing the latter to neutral point of thermal expansion. 3 - Dispositif suivant la revendication 1 ou 2, caractérisé en ce que les séquences d'arrêt et de redémarrage sont soumises à un automatisme connu, faisant succéder l'une à l'autre de façon rapide.3 - Device according to claim 1 or 2, characterized in that the stop and restart sequences are subject to known automation, making one succeed to the other quickly. 4 - Dispositif suivant l'une quelconque des revendications 1, 2 et 3, caractérisé en ce que la vanne commandée qui porte selon les cas le pompage auxiliaire (25) à la pression bâche ou à celle de l'accu de retour (18), est commandée elle-même par ladite pression.4 - Device according to any one of claims 1, 2 and 3, characterized in that the controlled valve which carries depending on the case the auxiliary pumping (25) at tank pressure or that of the return battery (18) , is itself controlled by said pressure. 5 - Dispositif suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que la vanne (29) de déclenchement de la séquence d'arrêt est choisi du type piloté à deux étages, ce qui accélère son intervention.5 - Device according to any one of claims 1 to 4, characterized in that the valve (29) for initiating the stop sequence is chosen from the piloted type with two stages, which accelerates its intervention.
EP88400736A 1986-10-24 1988-03-25 Hydraulic stopping device for a thermo-hydraulic generator Withdrawn EP0333960A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8614780A FR2605678B3 (en) 1986-10-24 1986-10-24 HYDRAULIC SHUTDOWN DEVICE FOR THERMOHYDRAULIC GENERATOR
EP88400736A EP0333960A1 (en) 1988-03-25 1988-03-25 Hydraulic stopping device for a thermo-hydraulic generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88400736A EP0333960A1 (en) 1988-03-25 1988-03-25 Hydraulic stopping device for a thermo-hydraulic generator

Publications (1)

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EP0333960A1 true EP0333960A1 (en) 1989-09-27

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EP88400736A Withdrawn EP0333960A1 (en) 1986-10-24 1988-03-25 Hydraulic stopping device for a thermo-hydraulic generator

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003575A1 (en) * 1994-07-27 1996-02-08 Innas Free Piston B.V. Hydraulic switching valve, and a free-piston engine provided therewith

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256066A (en) * 1960-02-03 1961-03-17 Renault Start and stop control of a free piston machine
FR2441073A1 (en) * 1978-11-13 1980-06-06 Moiroux Auguste Combined IC engine and air compressor - has air cushion cylinder to reverse direction at end of stroke between combustion and compression cylinders
US4599861A (en) * 1985-05-13 1986-07-15 Beaumont Richard W Internal combustion hydraulic engine
FR2601721A1 (en) * 1986-07-16 1988-01-22 Renault Device for stopping and starting a free piston
FR2605678A1 (en) * 1986-10-24 1988-04-29 Renault Hydraulic stop device for a thermohydraulic generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256066A (en) * 1960-02-03 1961-03-17 Renault Start and stop control of a free piston machine
FR2441073A1 (en) * 1978-11-13 1980-06-06 Moiroux Auguste Combined IC engine and air compressor - has air cushion cylinder to reverse direction at end of stroke between combustion and compression cylinders
US4599861A (en) * 1985-05-13 1986-07-15 Beaumont Richard W Internal combustion hydraulic engine
FR2601721A1 (en) * 1986-07-16 1988-01-22 Renault Device for stopping and starting a free piston
FR2605678A1 (en) * 1986-10-24 1988-04-29 Renault Hydraulic stop device for a thermohydraulic generator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003575A1 (en) * 1994-07-27 1996-02-08 Innas Free Piston B.V. Hydraulic switching valve, and a free-piston engine provided therewith
NL9401232A (en) * 1994-07-27 1996-03-01 Innas Free Piston Bv Hydraulic switching valve, as well as a free piston motor provided with it.
US5983638A (en) * 1994-07-27 1999-11-16 Innas Free Piston B.V. Hydraulic switching valve, and a free piston engine provided therewith

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