EP0101339B1 - Pressurizing device for the cooling system of an internal-combustion engine - Google Patents

Pressurizing device for the cooling system of an internal-combustion engine Download PDF

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Publication number
EP0101339B1
EP0101339B1 EP83401344A EP83401344A EP0101339B1 EP 0101339 B1 EP0101339 B1 EP 0101339B1 EP 83401344 A EP83401344 A EP 83401344A EP 83401344 A EP83401344 A EP 83401344A EP 0101339 B1 EP0101339 B1 EP 0101339B1
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EP
European Patent Office
Prior art keywords
pressure
value
chamber
valve
pressurization
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Expired
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EP83401344A
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German (de)
French (fr)
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EP0101339A1 (en
Inventor
Jean-Paul Pernet
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Renault Trucks SAS
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Renault Vehicules Industriels SA
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Priority to AT83401344T priority Critical patent/ATE14912T1/en
Publication of EP0101339A1 publication Critical patent/EP0101339A1/en
Application granted granted Critical
Publication of EP0101339B1 publication Critical patent/EP0101339B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F01P11/0209—Closure caps
    • F01P11/0238—Closure caps with overpressure valves or vent valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F01P11/0209—Closure caps
    • F01P11/0238—Closure caps with overpressure valves or vent valves
    • F01P2011/0242—Closure caps with overpressure valves or vent valves setting the pressure valve

Definitions

  • the present invention relates to a device for pressurizing the cooling circuit of a heat engine such as for example an internal combustion engine.
  • pressurization devices comprising an enclosure, supplied by a source of pressurized gas and in which the coolant of the heat engine circulates, such as for example an expansion tank.
  • These devices are fitted with a pressure relief valve connected to the atmosphere and having a first setting value, intended to reduce the pressure prevailing in the circuit when the latter exceeds a predetermined value.
  • the object of the invention is to propose a pressurization device making it possible to establish the desired pressure in the cooling circuit, whatever the engine load but without there being any sweeping of the expansion vessel by the gas of pressurization.
  • the invention provides a pressurization device of the type mentioned above, characterized in that it comprises a second pressure relief valve having a second setting value, mounted in series with said first valve between the latter and said enclosure so as to define between said first and second valves a chamber connected to said source of gas under pressure, and a vacuum valve provided for placing said chamber in communication with said enclosure when the pressure prevailing in the latter is lower than the pressure prevailing in said room.
  • the device according to the present invention makes it possible to prevent the enclosure from being swept by gas under pressurization pressure, while ensuring a level of pressurization equal to atmospheric pressure increased by the sum of said first and second taring values.
  • the device makes it possible to continue to ensure pressurization of the circuit in the event of failure of one of the two valves.
  • FIG. 1 a portion of a cooling circuit of a heat engine such as for example an internal combustion engine comprising a device 10 for pressurizing the circuit, produced in accordance with the teachings of the present invention.
  • a heat engine such as for example an internal combustion engine
  • a device 10 for pressurizing the circuit produced in accordance with the teachings of the present invention.
  • the pressurization device 10 comprises an enclosure 12, such as for example an expansion tank, in which circulates the coolant 14 which can enter and leave it through the conduits 16 and 18.
  • the device 10 comprises a first pressure relief valve 20 having a first setting value T,.
  • the first pressure relief valve 20 is mounted on the upper part of the enclosure 12 on which it is fixed by means of a hermetic plug 22 provided on its upper face with an orifice 24 opening towards the atmosphere.
  • the first pressure relief valve 20 is more precisely mounted at the end of a tubular chute 26 attached to the upper face 28 of the enclosure 12.
  • the pressurization device comprises a second pressure relief valve 30 having a second setting value T 2, which is mounted in series with the first pressure relief valve 20.
  • the second pressure relief valve 30 is fixed to the lower part of the chute 26 in the vicinity of the upper face 28 of the enclosure 12.
  • the second valve 30 is therefore, as can be seen in FIG. 1, mounted between the first valve 20 and the enclosure 12 so as to define between the first valve 20 and the second valve 30 a chamber 32 inside the tubular trough 26.
  • the enclosure 12 is supplied by a source of pressurized gas 34.
  • the enclosure 12 is supplied by the pressure source 34 through the chamber 32 to which the pressure source 34 is connected by means of a conduit 36 in which is arranged a non-return valve 38 capable of allowing the pressurized gas to pass only from the source 34 to the chamber 32.
  • the device comprises a vacuum valve 40, integrated in the pressure valve 30, having a third setting value T 3 .
  • the vacuum valve 40 which is shown schematically in FIGS. 2 to 4, is provided to allow the communication of the chamber 32 with the enclosure 12 when the pressure prevailing in the latter is lower than the pressure prevailing in the chamber 32.
  • the various pressure relief valves 20, 30 and depression 40 have not been shown in detail, but are of a conventional type commonly used in pressurized cooling circuits whose plugs are fitted with tared depression and pressure relief valves such that for example those illustrated in the French patent application published under No. 2439144.
  • the setting values T, and T 2 of the pressure relief valves 20 and 30 are equal to 250 millibars (mbar).
  • the setting value T 3 of the vacuum valve 40 being equal to 50 mbar.
  • the value of the atmospheric pressure P o prevailing outside the cooling circuit is equal to 1000 mbar is roughly one atmosphere.
  • the enclosure 12 is the expansion tank of a cooling circuit for an internal combustion engine of a motor vehicle, and the source of pressurized gas 34 can be constituted for example by a connected conduit. on intake of the engine if the latter is of the supercharged type or via a duct connected to the engine exhaust in the case of an atmospheric engine.
  • the source of pressurized gas, or pressurization gas flows into the conduit 36 and causes the pressure P to increase, prevailing in the chamber 32.
  • the vacuum valve 40 opens to cause the increase in the value of the pressure P prevailing in the enclosure 12. If the value of the pressure of the pressurizing gas coming from the source 34 is greater than a predetermined value equal to the atmospheric pressure P o increased by the setting value T, of the valve 30, the pressure level P, prevailing in the chamber 32 is permanently established at a value at least equal to said value predetermined.
  • the pressure P 2 prevailing in the enclosure 12 is established at a maximum pressurization value equal to P 0 + T 1 + T 2, ie in the example illustrated 1500 mbar. It is thus understood that the maximum value of the overpressure prevailing in the circuit is equal to the sum of the calibration values T, and T 2 , whatever the values of the latter which are not necessarily equal.
  • a second vacuum valve 50 integrated into the first pressure relief valve 20.
  • This second vacuum valve 50 is not always necessary for the operation of the device according to the present invention but it makes it possible to equalize the levels pressure P 0 and P, when the engine is stopped and the source of pressurized gas 34 no longer flows; the setting T 4 of the second vacuum valve 50 must of course be chosen at a low value, for example equal to the value of the setting T 3 of the first vacuum valve 40.
  • the pressurization device would continue to operate with a maximum pressurization value equal to P 0 + T 1 but with the drawback that the device would operate with a sweep of the enclosure by pressurizing gas.
  • the maximum value of the pressurization is equal to T, + T Z but it is in no case imperative that the two calibration values are equal; however, in the event of failure of one of the two valves, and as has just been described, the pressure in the circuit will be established at atmospheric value increased by the setting value of the valve which continues to operate.
  • the supply of pressurized gas takes place through a calibrated orifice 36, 38, since this supply must only supply a leak rate.
  • This calibration is desirable in par Particularly if the pressurization gas in question is taken from the engine exhaust, in order to limit condensation in the cooling system. Although it does not affect the invention itself, this calibration is also desirable if the gas is taken directly from the vehicle's compressed air circuit or from the engine's charge air, in order to limit losses.
  • the volume of the chamber 32 is small compared to the volume of the enclosure 12, and this in order to avoid a too rapid pressure drop when the valve 30 opens.

Abstract

This invention has as its object a pressurization device for a cooling system of a heat engine. According to the invention, the device (10) includes two pressure relief valves (20, 30) mounted in a series, a chamber (32) between the pressure relief valves (20, 30), and a source (34) of gas under pressure connected to the chamber (32). The expansion chamber (12) is not subjected to the scavenging of the pressurization gas, and the maximum value of the pressurization is equal to the sum of the values of the calibrations of the two pressure relief valves (20, 30).

Description

La présente invention a pour objet un dispositif de pressurisation du circuit de refroidissement d'un moteur thermique tel que par exemple un moteur à combustion interne.The present invention relates to a device for pressurizing the cooling circuit of a heat engine such as for example an internal combustion engine.

On connaît des dispositifs de pressurisation comprenant une enceinte, alimentée par une source de gaz sous pression et dans laquelle circule le liquide de refroidissement du moteur thermique, telle que par exemple un vase d'expansion.There are known pressurization devices comprising an enclosure, supplied by a source of pressurized gas and in which the coolant of the heat engine circulates, such as for example an expansion tank.

Ces dispositifs sont munis d'un clapet de surpression relié à l'atmosphère et possédant une première valeur de tarage, prévu pour réduire la pression régnant dans le circuit lorsque celle-ci dépasse une valeur prédéterminée.These devices are fitted with a pressure relief valve connected to the atmosphere and having a first setting value, intended to reduce the pressure prevailing in the circuit when the latter exceeds a predetermined value.

De nos jours, la plupart des véhicules routiers munis d'un moteur à combustion interne fonctionnent avec un circuit de refroidissement pressurisé comportant un bouchon incorporant un clapettaré à une pression supérieure à la pression atmosphérique du type de celui qui vient d'être décrit, de tels dispositifs permettant d'élever la température d'ébullition du liquide de refroidissement et donc d'augmenter la capacité d'évacuation de la chaleur de ce dernier. De tels dispositifs possèdent une grande capacité d'évacuation de la chaleur mais ont pour inconvénient de provoquer un balayage constant du liquide de refroidissement à la partie supérieure du vase d'expansion par le gaz de pressurisation, ce qui a pour conséquence de provoquer des déperditions de liquides de refroidissement.Nowadays, most road vehicles fitted with an internal combustion engine operate with a pressurized cooling circuit comprising a plug incorporating a valve at a pressure higher than atmospheric pressure of the type just described, of such devices make it possible to raise the boiling point of the coolant and therefore increase the heat dissipation capacity of the latter. Such devices have a high heat dissipation capacity but have the disadvantage of causing constant sweeping of the coolant at the top of the expansion tank by the pressurizing gas, which has the consequence of causing losses. coolants.

L'invention a pour but de proposer un dispositif de pressurisation permettant d'établir la pression désirée dans le circuit de refroidissement, quelle que soit la charge du moteur mais sans qu'il y ait de balayage du vase d'expansion par le gaz de pressurisation.The object of the invention is to propose a pressurization device making it possible to establish the desired pressure in the cooling circuit, whatever the engine load but without there being any sweeping of the expansion vessel by the gas of pressurization.

Dans ce but, l'invention propose un dispositif de pressurisation du type mentionné plus haut, caractérisé en ce qu'il comporte un deuxième clapet de surpression possédant une seconde valeur de tarage, monté en série avec ledit premier clapet entre ce dernier et ladite enceinte de façon à définir entre lesdits premier et second clapets une chambre reliée à ladite source de gaz sous pression, et un clapet de dépression prévu pour mettre ladite chambre en communication avec ladite enceinte lorsque la pression régnant dans cette dernière est inférieure à la pression régnant dans ladite chambre.To this end, the invention provides a pressurization device of the type mentioned above, characterized in that it comprises a second pressure relief valve having a second setting value, mounted in series with said first valve between the latter and said enclosure so as to define between said first and second valves a chamber connected to said source of gas under pressure, and a vacuum valve provided for placing said chamber in communication with said enclosure when the pressure prevailing in the latter is lower than the pressure prevailing in said room.

Grâce à de telles caractéristiques, le dispositif selon la présente invention permet d'éviter le balayage de l'enceinte par le gaz sous pression de pressurisation, tout en assurant un niveau de pressurisation égal à la pression atmosphérique augmentée de la somme desdites première et seconde valeurs de tarage.Thanks to such characteristics, the device according to the present invention makes it possible to prevent the enclosure from being swept by gas under pressurization pressure, while ensuring a level of pressurization equal to atmospheric pressure increased by the sum of said first and second taring values.

De plus, et comme cela sera décrit plus en détail, le dispositif permet de continuer d'assurer une pressurisation du circuit en cas de défaillance de l'un des deux clapets.In addition, and as will be described in more detail, the device makes it possible to continue to ensure pressurization of the circuit in the event of failure of one of the two valves.

On décrira maintenant à titre d'exemple un mode de réalisation de la présente invention en se référant aux dessins annexés dans lesquels:

  • - la fig. 1 est une vue générale du dispositif de pressurisation réalisé conformément aux enseignements de la présente invention; et
  • - les fig. 2 à 4 sont des représentations schématiques du dispositif selon la présente invention, illustrant diverses étapes de fonctionnement de celui-ci.
An embodiment of the present invention will now be described by way of example with reference to the appended drawings in which:
  • - fig. 1 is a general view of the pressurization device produced in accordance with the teachings of the present invention; and
  • - figs. 2 to 4 are schematic representations of the device according to the present invention, illustrating various stages of operation thereof.

On a représenté à la fig. 1 une portion d'un circuit de refroidissement d'un moteur thermique tel que par exemple un moteur à combustion interne comportant un dispositif 10 de pressurisation du circuit, réalisé conformément aux enseignements de la présente invention.There is shown in FIG. 1 a portion of a cooling circuit of a heat engine such as for example an internal combustion engine comprising a device 10 for pressurizing the circuit, produced in accordance with the teachings of the present invention.

Le dispositif de pressurisation 10 comprend une enceinte 12, telle que par exemple un vase d'expansion, dans laquelle circule le liquide de refroidissement 14 qui peut y pénétrer et en sortir par les conduits 16 et 18.The pressurization device 10 comprises an enclosure 12, such as for example an expansion tank, in which circulates the coolant 14 which can enter and leave it through the conduits 16 and 18.

Le dispositif 10 comprend un premier clapet de surpression 20 possédant une première valeur de tarage T, . Le premier clapet de surpression 20 est monté à la partie suprérieure de l'enceinte 12 sur laquelle il est fixé au moyen d'un bouchon hermétique 22 muni à sa face supérieure d'un orifice 24 débouchant vers l'atmosphère. Le premier clapet de surpression 20 est plus précisément monté à l'extrémité d'une goulotte tubulaire 26 rapportée sur la face supérieure 28 de l'enceinte 12.The device 10 comprises a first pressure relief valve 20 having a first setting value T,. The first pressure relief valve 20 is mounted on the upper part of the enclosure 12 on which it is fixed by means of a hermetic plug 22 provided on its upper face with an orifice 24 opening towards the atmosphere. The first pressure relief valve 20 is more precisely mounted at the end of a tubular chute 26 attached to the upper face 28 of the enclosure 12.

Selon l'invention, le dispositif de pressurisation comporte un deuxième clapet de surpression 30 possédant une seconde valeur de tarage T 2, qui est monté en série avec le premier clapet de surpression 20. Le deuxième clapet de surpression 30 est fixé à la partie inférieure de la goulotte 26 au voisinage de la face supérieure 28 de l'enceinte 12. Le second clapet 30 est donc, comme on peut le voir à la fig. 1, monté entre le premier clapet 20 et l'enceinte 12 de façon à définir entre le premier clapet 20 et le second clapet 30 une chambre 32 à l'intérieur de la goulotte tubulaire 26.According to the invention, the pressurization device comprises a second pressure relief valve 30 having a second setting value T 2, which is mounted in series with the first pressure relief valve 20. The second pressure relief valve 30 is fixed to the lower part of the chute 26 in the vicinity of the upper face 28 of the enclosure 12. The second valve 30 is therefore, as can be seen in FIG. 1, mounted between the first valve 20 and the enclosure 12 so as to define between the first valve 20 and the second valve 30 a chamber 32 inside the tubular trough 26.

Conformément à l'invention, l'enceinte 12 est alimentée par une source de gaz sous pression 34. L'alimentation de l'enceinte 12 par la source de pression 34 se fait au travers de la chambre 32 à laquelle la source de pression 34 est reliée au moyen d'un conduit 36 dans lequel est disposé un clapet antiretour 38 susceptible de ne laisser passer le gaz sous pression que depuis la source 34 vers la chambre 32. Afin de permettre la mise en communication de l'enceinte 12 avec la source de pression 34, le dispositif comporte un clapet de dépression 40, intégré dans le clapet de surpression 30, possédant une troisième valeur de tarage T3. Le clapet de dépression 40, qui est représenté de manière schématique aux fig. 2 à 4, est prévu pour permettre la mise en communication de la chambre 32 avec l'enceinte 12 lorsque la pression régnant dans cette dernière est inférieure à la pression régnant dans la chambre 32.According to the invention, the enclosure 12 is supplied by a source of pressurized gas 34. The enclosure 12 is supplied by the pressure source 34 through the chamber 32 to which the pressure source 34 is connected by means of a conduit 36 in which is arranged a non-return valve 38 capable of allowing the pressurized gas to pass only from the source 34 to the chamber 32. In order to allow the enclosure 12 to communicate with the pressure source 34, the device comprises a vacuum valve 40, integrated in the pressure valve 30, having a third setting value T 3 . The vacuum valve 40, which is shown schematically in FIGS. 2 to 4, is provided to allow the communication of the chamber 32 with the enclosure 12 when the pressure prevailing in the latter is lower than the pressure prevailing in the chamber 32.

Les divers clapets de surpression 20, 30 et de dépression 40 n'ont pas été représentés en détail, mais sont d'un type classique couramment utilisé dans les circuits de refroidissement pressurisés dont les bouchons sont munis de clapets tarés de dépression et de surpression tels que par exemple ceux illustrés dans la demande de brevet français publiée sous le No 2439144.The various pressure relief valves 20, 30 and depression 40 have not been shown in detail, but are of a conventional type commonly used in pressurized cooling circuits whose plugs are fitted with tared depression and pressure relief valves such that for example those illustrated in the French patent application published under No. 2439144.

On décrira maintenant le mode de fonctionnement du dispositif de pressurisation illustré à la fig.1 en se référant plus particulièrement aux fig. 2 à 4. Dans le mode de réalisation représenté, les valeurs de tarage T, et T2 des clapets de surpression 20 et 30 sont égales à 250 millibars (mbar). La valeur de tarage T3 du clapet de dépression 40 étant égale à 50 mbar. On supposera pour la description qui va suivre que la valeur de la pression atmosphérique Po régnant à l'extérieur du circuit de refroidissement est égale à 1000 mbar soit à peu près une atmosphère. Dans l'exemple représenté, l'enceinte 12 est le vase d'expansion d'un circuit de refroidissement pour moteur à combustion interne d'un véhicule automobile, et la source de gaz sous pression 34 peut être constituée par exemple par un conduit relié à l'admission du moteur si ce dernier est du type suralimenté ou par un conduit relié à l'échappement du moteur dans le cas d'un moteur atmosphérique.We will now describe the operating mode of the pressurization device illustrated in fig.1 with particular reference to fig. 2 to 4. In the embodiment shown, the setting values T, and T 2 of the pressure relief valves 20 and 30 are equal to 250 millibars (mbar). The setting value T 3 of the vacuum valve 40 being equal to 50 mbar. It will be assumed for the description which follows that the value of the atmospheric pressure P o prevailing outside the cooling circuit is equal to 1000 mbar is roughly one atmosphere. In the example shown, the enclosure 12 is the expansion tank of a cooling circuit for an internal combustion engine of a motor vehicle, and the source of pressurized gas 34 can be constituted for example by a connected conduit. on intake of the engine if the latter is of the supercharged type or via a duct connected to the engine exhaust in the case of an atmospheric engine.

Lorsque le moteur est mis en marche, la source de gaz sous pression, ou gaz de pressurisation, débite dans le conduit 36 et provoque l'augmentation de la pression P, régnant dans la chambre 32. Sous l'effet de l'augmentation de la pression régnant dans la chambre 32, le clapet de dépression 40 s'ouvre pour provoquer l'augmentation de la valeur de la pression P régnant dans l'enceinte 12. Si la valeur de la pression du gaz de pressurisation provenant de la source 34 est supérieure à une valeur prédéterminée égale à la pression atmosphérique Po augmentée de la valeur de tarage T, du clapet 30, le niveau de pression P, régnant dans la chambre 32 s'établit en permanence à une valeur au moins égale à ladite valeur prédéterminée. Si, comme il est souhaitable, la valeur de la pression du gaz de pressurisation est supérieure à ladite valeur prédéterminée augmentée de la seconde valeur de tarage T2 du clapet de surpression 30, la pression P2 régnant dans l'enceinte 12 s'établit à une valeur de pressurisation maximale égale à P0+T1 +T2 soit dans l'exemple illustré 1500 mbar. On comprend ainsi que la valeur maximale de la surpression régnant dans le circuit est égale à la somme des valeurs de tarage T, et T2, quelles que soient les valeurs de ces dernières qui ne sont pas nécessairement égales.When the engine is started, the source of pressurized gas, or pressurization gas, flows into the conduit 36 and causes the pressure P to increase, prevailing in the chamber 32. Under the effect of the increase in the pressure prevailing in the chamber 32, the vacuum valve 40 opens to cause the increase in the value of the pressure P prevailing in the enclosure 12. If the value of the pressure of the pressurizing gas coming from the source 34 is greater than a predetermined value equal to the atmospheric pressure P o increased by the setting value T, of the valve 30, the pressure level P, prevailing in the chamber 32 is permanently established at a value at least equal to said value predetermined. If, as is desirable, the value of the pressure of the pressurizing gas is greater than said predetermined value increased by the second setting value T 2 of the pressure relief valve 30, the pressure P 2 prevailing in the enclosure 12 is established at a maximum pressurization value equal to P 0 + T 1 + T 2, ie in the example illustrated 1500 mbar. It is thus understood that the maximum value of the overpressure prevailing in the circuit is equal to the sum of the calibration values T, and T 2 , whatever the values of the latter which are not necessarily equal.

Lorsque la valeur de la pression P2 est égale à la valeur de pressurisation maximale, les clapets de surpression 30 et de dépression 40 sont en position fermée tels que représentés à la fig. 3. Dans ces conditions, la source de pression 34 qui continue à débiter dans la chambre 32 à une valeur de pression supérieure à Po+T, provoque l'ouverture du clapet de surpression 20 et l'échappement vers l'atmosphère du gaz de surpression.When the value of the pressure P 2 is equal to the maximum pressurization value, the pressure relief valves 30 and vacuum valves 40 are in the closed position as shown in FIG. 3. Under these conditions, the pressure source 34 which continues to flow into the chamber 32 at a pressure value greater than P o + T, causes the opening of the pressure relief valve 20 and the exhaust to the gas atmosphere overpressure.

Si la pression P2 régnant dans l'enceinte 12 et par la même dans le circuit de refroidissement continue à augmenter au-delà de la valeur maximale de pressurisation P0+T1 +T2, par exemple sous l'effet de la dilatation ou de la vaporisation du liquide de refroidissement, on se trouve alors dans les conditions illustrées à la fig. 4. Dans ces conditions, l'augmentation de la valeur de la pression P2 provoque l'ouverture du clapet de surpression 30 jusqu'à ce que la pression P2 s'établisse à nouveau à la valeur de surpression maximale P0+T1 +T2.If the pressure P 2 prevailing in the enclosure 12 and by the same in the cooling circuit continues to increase beyond the maximum value of pressurization P 0 + T 1 + T 2 , for example under the effect of expansion or spraying the coolant, we are then in the conditions illustrated in fig. 4. Under these conditions, the increase in the value of the pressure P 2 causes the opening of the overpressure valve 30 until the pressure P 2 is again established at the maximum overpressure value P 0 + T 1 + T 2 .

Comme on peut le remarquer aux fig. 2 à 4, on a également représenté un second clapet de dépression 50 intégré au premier clapet de surpression 20. Ce second clapet de dépression 50 n'est pas toujours nécessaire au fonctionnement du dispositif selon la présente invention mais il permet d'égaliser les niveaux de pression P0 et P, lorsque le moteur est arrêté et que la source de gaz sous pression 34 ne débite plus; le tarage T4 du second clapet de dépression 50 devant bien entendu être choisi à une valeur faible par exemple égale à la valeur du tarage T3 du premier clapet de dépression 40.As can be seen in Figs. 2 to 4, there is also shown a second vacuum valve 50 integrated into the first pressure relief valve 20. This second vacuum valve 50 is not always necessary for the operation of the device according to the present invention but it makes it possible to equalize the levels pressure P 0 and P, when the engine is stopped and the source of pressurized gas 34 no longer flows; the setting T 4 of the second vacuum valve 50 must of course be chosen at a low value, for example equal to the value of the setting T 3 of the first vacuum valve 40.

Au cas où accidentellement le clapet de surpression 20 se coincerait en position ouverte, la pression P, régnant dans la chambre 32 deviendrait égale à la pression atmosphérique Po, et le dispositif de pressurisation fonctionnerait encore, grâce au second clapet de surpression 30, mais la valeur maximale de pressurisation serait égale à PO+T2 soit dans l'exemple représenté 1250 mbar.In the event that the pressure relief valve 20 accidentally gets stuck in the open position, the pressure P, prevailing in the chamber 32 becomes equal to atmospheric pressure P o , and the pressurization device would still function, thanks to the second pressure relief valve 30, but the maximum pressurization value would be equal to P O + T 2, ie in the example shown 1250 mbar.

Si, inversement, le second clapet de surpression 30 venait à se coincer en position ouverte, le dispositif de pressurisation continuerait à fonctionner avec une valeur maximale de pressurisation égale à P0+T1 mais avec l'inconvénient que le dispositif fonctionnerait avec un balayage de l'enceinte par le gaz de pressurisation.If, conversely, the second pressure relief valve 30 gets stuck in the open position, the pressurization device would continue to operate with a maximum pressurization value equal to P 0 + T 1 but with the drawback that the device would operate with a sweep of the enclosure by pressurizing gas.

Dans l'exemple qui vient d'être décrit, la valeur maximale de la pressurisation est égale à T, +TZ mais il n'est en aucun cas impératif que les deux valeurs de tarage soient égales; toutefois, en cas de panne de l'un des deux clapets, et comme cela vient d'être décrit, la pression dans le circuit s'établira à la valeur atmosphérique augmentée de la valeur de tarage du clapet qui continue de fonctionner.In the example which has just been described, the maximum value of the pressurization is equal to T, + T Z but it is in no case imperative that the two calibration values are equal; however, in the event of failure of one of the two valves, and as has just been described, the pressure in the circuit will be established at atmospheric value increased by the setting value of the valve which continues to operate.

En ce qui concerne la valeur de la pression du gaz de pressurisation provenant de la source de pression 34, et comme cela a été précisé plus tôt, il est nécessaire que cette pression soit supérieure à la valeur maximale de pressurisation que l'on désire obtenir dans le circuit. Toutefois, au cas où cette valeur serait inférieure à cette valeur maximale mais supérieure à la valeur P0+T1, la valeur maximale de pressurisation serait maintenue, mais la montée en pression du circuit jusqu'à cette valeur maximale ne pourrait se faire au-delà de la valeur de la pression d'alimentation que par dilatation ou vaporisation du liquide de refroidissement. Dans le cas où la valeur de pression provenant de la source 34 est inférieure à la valeur Po+T, telle que dans l'exemple illustré 1150 mbar, la pression maximale de pressurisation ne pourrait en aucun cas être supérieure à cette valeur augmentée de 250 mbar soit 1400 mbar.As regards the value of the pressure of the pressurizing gas coming from the pressure source 34, and as was specified earlier, it is necessary that this pressure is greater than the maximum value of pressurization which it is desired to obtain in the circuit. However, in the event that this value is lower than this maximum value but greater than the value P 0 + T 1 , the maximum pressurization value would be maintained, but the rise in pressure of the circuit to this maximum value could not take place at the beyond the value of the supply pressure only by expansion or spraying of the coolant. In the case where the pressure value coming from the source 34 is lower than the value P o + T, such as in the example illustrated 1150 mbar, the maximum pressurization pressure could in no case be higher than this value increased by 250 mbar or 1400 mbar.

Dans le mode de réalisation illustré aux figures, il est souhaitable que l'alimentation en gaz sous pression se fasse à travers un orifice 36, 38 calibré, car cette alimentation doit seulement alimenter un débit de fuite. Ce calibrage est souhaitable en particulier si le gaz de pressurisation en question est prélevé sur l'échappement moteur, afin de limiter les condensations dans le système de refroidissement. Bien que sans incidence sur l'invention proprement dite, ce calibrage est également souhaitable si le gaz est prélevé directement sur le circuit d'air comprimé du véhicule ou sur l'air de suralimentation du moteur, afin de limiter les pertes.In the embodiment illustrated in the figures, it is desirable that the supply of pressurized gas takes place through a calibrated orifice 36, 38, since this supply must only supply a leak rate. This calibration is desirable in par Particularly if the pressurization gas in question is taken from the engine exhaust, in order to limit condensation in the cooling system. Although it does not affect the invention itself, this calibration is also desirable if the gas is taken directly from the vehicle's compressed air circuit or from the engine's charge air, in order to limit losses.

Par ailleurs, il est nécessaire que le volume de la chambre 32 soit faible par rapport au volume de l'enceinte 12 et cela afin d'éviter une chute de pression trop rapide au moment de l'ouverture du clapet 30.Furthermore, it is necessary for the volume of the chamber 32 to be small compared to the volume of the enclosure 12, and this in order to avoid a too rapid pressure drop when the valve 30 opens.

Claims (5)

1. Apparatus (10) for pressurising the cooling circuit of a heat engine comprising a tank (12) which is supplied by a pressurised gas source (34) and in which the cooling liquid (14) circulates, and a first pressure relief valve (20) which is connected to atmosphere and which has a first calibrated value (T, ) for reducing the pressure obtaining in the circuit when it exceeds a predetermined value (P0+T1 ), characterised in that it comprises a second pressure relief valve (30) having a second calibrated value (T2) which is connected in series with said first valve (20) between the latter and said tank (12) so as to define between said first and second valves (20, 30) a chamber (32) connected to said pressurised gas source (34), and a depression valve (40) for communicating said chamber (32) with said tank (12) when the pressure (P2) obtaining in said tank is lower than the pressure (P,) obtaining in said chamber (32).
2. Apparatus according to claim 1, characterised in that the value of the pressure of said pressurised gas is higher than said predetermined value (Po+T, ).
3. Apparatus according to claim 2, characterised in that said value of the pressure of said pressurised gas is higher than said predetermined value (P0+T1 ) increased bysaid second calibrated value (T2)..
4. Apparatus according to any one of the preceding claims, characterised in that said chamber (32) is connected to said pressurised gas source by means of a conduit (36) in which a non- return valve (38) is disposed.
5. Apparatus according to any one of the preceding claims, characterised in that the volume of said chamber (32) is small in relation to the volume of the tank (12).
EP83401344A 1982-07-08 1983-06-29 Pressurizing device for the cooling system of an internal-combustion engine Expired EP0101339B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401344T ATE14912T1 (en) 1982-07-08 1983-06-29 PRESSURE DEVICE OF THE REFRIGERATION CIRCUIT OF AN INTERNAL ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8211977 1982-07-08
FR8211977A FR2529951A1 (en) 1982-07-08 1982-07-08 DEVICE FOR PRESSURIZING THE COOLING CIRCUIT OF A THERMAL ENGINE

Publications (2)

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EP0101339A1 EP0101339A1 (en) 1984-02-22
EP0101339B1 true EP0101339B1 (en) 1985-08-14

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EP83401344A Expired EP0101339B1 (en) 1982-07-08 1983-06-29 Pressurizing device for the cooling system of an internal-combustion engine

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US (1) US4478178A (en)
EP (1) EP0101339B1 (en)
AT (1) ATE14912T1 (en)
DE (1) DE3360572D1 (en)
ES (1) ES8403565A1 (en)
FR (1) FR2529951A1 (en)

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DE3716555A1 (en) * 1987-05-18 1988-12-08 Bayerische Motoren Werke Ag FILLING, VENTILATION AND PRESSURE CONTROL DEVICE FOR THE LIQUID COOLING CIRCUIT OF ENGINE AND WORKING MACHINES, IN PARTICULAR COMBUSTION ENGINES

Also Published As

Publication number Publication date
FR2529951A1 (en) 1984-01-13
ES523153A0 (en) 1984-03-16
DE3360572D1 (en) 1985-09-19
ES8403565A1 (en) 1984-03-16
US4478178A (en) 1984-10-23
EP0101339A1 (en) 1984-02-22
ATE14912T1 (en) 1985-08-15
FR2529951B1 (en) 1984-12-14

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