EP0287450A1 - Radiator cap for the regulation of the cooling circuit of an engine - Google Patents

Radiator cap for the regulation of the cooling circuit of an engine Download PDF

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Publication number
EP0287450A1
EP0287450A1 EP88400874A EP88400874A EP0287450A1 EP 0287450 A1 EP0287450 A1 EP 0287450A1 EP 88400874 A EP88400874 A EP 88400874A EP 88400874 A EP88400874 A EP 88400874A EP 0287450 A1 EP0287450 A1 EP 0287450A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pressure relief
relief valve
engine
valve
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.)
Withdrawn
Application number
EP88400874A
Other languages
German (de)
French (fr)
Inventor
Philippe Le Gauyer
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.)
Valeo Chausson Thermique SA
Original Assignee
Valeo Chausson Thermique SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Chausson Thermique SA filed Critical Valeo Chausson Thermique SA
Publication of EP0287450A1 publication Critical patent/EP0287450A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P3/2207—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point characterised by the coolant reaching temperatures higher than the normal atmospheric boiling point
    • 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
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • 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
    • 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
    • F01P2070/00—Details
    • F01P2070/04—Details using electrical heating elements
    • 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
    • F01P2070/00—Details
    • F01P2070/06—Using intake pressure as actuating fluid

Definitions

  • the present invention relates to the cooling circuits of heat engines, and more particularly those used in motor vehicles.
  • the cooling circuits are always fitted with pressure relief valves and, almost always, also with vacuum valves.
  • the pressure relief valves are calibrated by a spring to allow the circuit to operate under a pressure higher than atmospheric pressure, but nevertheless limited to a threshold for which the various parts of the circuit are not permanently subjected to mechanical fatigue which may be harmful. to their longevity.
  • the electric motor driving a fan pulsating air through the cooling circuit radiator is kept energized so as to cool the liquid as long as the temperature of said coolant. detected by a thermostat has not been lowered sufficiently.
  • the invention solves this problem.
  • the heat exchanger cap for regulating the pressure inside the cooling circuit of an internal combustion engine comprising at least one pressure relief valve is characterized in that the pressure relief valve is associated with means giving it a first setting threshold for normal engine operation and a second threshold when the engine is stopped.
  • the cap illustrated in FIG. 1 includes a cover 1 intended to be fixed, for example screwed by a thread 2 provided on its cylindrical part, on a base of a heat exchanger or of an expansion vessel connected to an exchanger heat.
  • the cover 1 is provided on its internal flat face with a seal 3 and internally comprises the volume delimited by the cover and from this same face, a housing 4, here tubular and coaxial with the cover 1, closed to a from its ends by a flat wall located opposite and at a distance from the internal face of said cover, said wall comprising, here perpendicularly, an opening 5, here coaxial with said housing.
  • the housing 4 makes it possible to contain, by virtue of its other open end, situated substantially in the same plane as the flat face of the cover, a spring 6, one end of which bears on the flat wall of the housing 4 and the other end of which rests on a vacuum valve 7 which, in the example illustrated, is applied against the base of a finger 8 forming part of a valve overpressure 9, said finger being inserted inside the housing 4.
  • the pressure relief valve 9 comprises, coaxially with the finger 8, a circular flange, the internal face of which is provided with a seal 11 which comes to bear on an annular seat 12 provided coaxially with the housing 4 on the top of the cover 1 .
  • the pressure relief valve 9 is provided with a light 10, for example coaxial with the opening 5, and opening beyond the finger 8 and the circular flange of said valve.
  • the pressure relief valve is surrounded by a coaxial sheath 13 projecting from the top of the cover 1 and the upper part of which is closed by a capsule 14, said sheath comprising at least one opening 15 provided on its tubular part.
  • the capsule 14 holds a cartridge 16 passing through said capsule while being coaxial with the sheath 13 and opening out inside the latter, said cartridge comprising guide parts 17 for a socket 18 against which a end of a spring 19, the other end of which bears on the pressure relief valve 9 so as to apply the latter to the annular seat 11.
  • the cartridge 16 can be constituted by different organs, in particular, it can be constituted by an element containing an expandable wax or else it can be made of a shape memory alloy or by any other device known in the art for exhibiting expansion large linear in a relatively small temperature difference.
  • the cartridge 16 is provided with an electric heating resistor 20, the supply of which from an electric current source 21 is controlled by a relay 22 which can be controlled, for example by a thermostat sensitive to the coolant temperature of an engine with a cooling heat exchanger cap described in the above.
  • the coolant is heated but, normally, the various parts of the plug always remain in the illustrated position if the pressure in the exchanger is below a threshold previously determined for normal operation.
  • the pressure applied to the valve 9, and more particularly to the flat surface of the finger 8, causes the valve 9 to be raised, leaves its seat 11, and steam escapes passing through the opening 5 and opening 15.
  • the temperature of the coolant, in its jackets and in the cooling circuit continues to increase and may exceed a previously selected threshold value.
  • This threshold value is detected by the thermostat which controls the relay 22, thereby ensuring the supply of electric current to the resistor 20.
  • the heating of the cartridge 16 causes its linear expansion and, consequently, the sleeve 18 is brought to the position 18a for which it is shown in dotted lines. In this position, the calibration due to the spring 19 is modified, here larger, since the spring 19 is compressed.
  • the pressure relief valve 9 can only be raised beyond a second pressure threshold corresponding to the new setting of the valve 9.
  • the second pressure threshold is chosen so that the pressure relief valve 9 cannot normally be lifted unless the pressure prevailing inside the heat exchanger reaches a value such that parts of this heat exchanger heat or the circuit to which it is connected may be damaged.
  • FIG. 2 illustrates a variant in which the cover 1 carries the housing 4a on its top.
  • the vacuum valve 7 is arranged as before in the housing 4.
  • the pressure valve 9 whose calibration is ensured by the spring 19 rests by its seal 11 on two annular seats 23, 24 provided here on the bottom of the sheath 13 located at a distance from the cover 1.
  • a capsule 14 closes the sheath 13.
  • a channel 25 is provided to open, here radially, inside the housing 4a and this channel is normally closed by a valve 26 which is held by a nozzle 27 defining an interior chamber 29 containing said valve and connected by a conduit 28 to engine intake.
  • the chamber 29 communicates by a conduit 30 with the space separating the two seats 23, 24 described above.
  • the valve 9 is calibrated at a first pressure threshold beyond which it is accepted that said valve can open.
  • the above operating conditions therefore correspond to those of the second pressure threshold which prevents the opening of the pressure relief valve 9, unless the pressure produced inside the exchanger reaches the second threshold above which a risk of damage would exist.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Abstract

Regulating plug, characterised in that the relief valve (9) which it contains is associated with means (16) giving it a first calibration threshold for a normal operation of the engine and a second threshold when the engine is stopped. <IMAGE>

Description

La présente invention concerne les circuits de refroidissement des moteurs thermiques, et plus particulièrement ceux qui sont utilisés dans des véhicules automobiles.The present invention relates to the cooling circuits of heat engines, and more particularly those used in motor vehicles.

Les circuits de refroidissement sont toujours munis de clapets de surpression et, presque toujours aussi, de clapets de dépression.The cooling circuits are always fitted with pressure relief valves and, almost always, also with vacuum valves.

Les clapets de surpression sont tarés par un ressort pour permettre au circuit de fonctionner sous une pression plus élevée que la pression atmosphérique, mais limitée néanmoins à un seuil pour lequel les différentes parties du circuit ne sont pas soumises en permanence à une fatigue mécanique pouvant nuire à leur longévité.The pressure relief valves are calibrated by a spring to allow the circuit to operate under a pressure higher than atmospheric pressure, but nevertheless limited to a threshold for which the various parts of the circuit are not permanently subjected to mechanical fatigue which may be harmful. to their longevity.

Il est connu des spécialistes, qu'au moment de l'arrêt du moteur, principalement lorsqu'il a été au préalable soumis à une charge élevée, la température dans le circuit de refroidissement continue à s'élever et il en résulte une augmentation de pression qui provoque souvent le soulèvement du clapet de surpression et, par conséquent, une perte de liquide de refroidissement.It is known to specialists that when the engine is stopped, mainly when it has been subjected to a high load beforehand, the temperature in the cooling circuit continues to rise and this results in an increase of pressure which often causes the pressure relief valve to rise and therefore lose coolant.

Pour pallier cet inconvénient, il est prévu que le moteur électrique d'entraînement d'un ventilateur pulsant de l'air à travers le radiateur de circuit de refroidissement soit maintenu sous tension de façon à refroidir le liquide tant que la température dudit liquide de refroidissement détectée par un thermostat n'a pas été abaissée suffisamment.To overcome this drawback, it is provided that the electric motor driving a fan pulsating air through the cooling circuit radiator is kept energized so as to cool the liquid as long as the temperature of said coolant. detected by a thermostat has not been lowered sufficiently.

La solution exposée ci-dessus ne peut pas être mise en oeuvre lorsque le ventilateur pulsant de l'air à travers le radiateur de refroidissement est entraîné directement par le moteur ou par un moyen, tel qu'une courroie, lui-même entraîné directement par le moteur.The solution set out above cannot be implemented when the fan pulsating air through the cooling radiator is driven directly by the engine or by a means, such as a belt, itself driven directly by engine.

Ces cas sont extrêmement fréquents, notamment en ce qui concerne les véhicules poids-lourds et, par conséquent, le problème exposé dans ce qui précède demeure entier.These cases are extremely frequent, in particular with regard to heavy vehicles and, consequently, the problem explained in the foregoing remains unresolved.

L'invention résout ce problème.The invention solves this problem.

Conformément à l'invention, le bouchon d'échangeur de chaleur pour la régulation de la pression à l'intérieur du circuit de refroidissement d'un moteur à combustion interne comportant au moins un clapet du surpression est caractérisé en ce que le clapet de surpression est associé à des moyens lui conférant un premier seuil de tarage pour un fonctionnement normal du moteur et un second seuil lorsque le moteur est arrêté.According to the invention, the heat exchanger cap for regulating the pressure inside the cooling circuit of an internal combustion engine comprising at least one pressure relief valve is characterized in that the pressure relief valve is associated with means giving it a first setting threshold for normal engine operation and a second threshold when the engine is stopped.

Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit.Various other characteristics of the invention will also emerge from the detailed description which follows.

Des formes de réalisation de l'objet de l'invention sont représentées, à titre d'exemples non limitatifs, au dessin annexé.

  • La figure 1 est une coupe élévation schématique d'un bouchon pression-dépression réalisé selon l'invention.
  • La figure 2 est une coupe-élévation d'un bouchon pression-dépression illustrant une variante de l'invention.
Embodiments of the object of the invention are shown, by way of nonlimiting examples, in the accompanying drawing.
  • Figure 1 is a schematic sectional elevation of a pressure-vacuum plug made according to the invention.
  • Figure 2 is a sectional elevation of a pressure-vacuum plug illustrating a variant of the invention.

Le bouchon illustré sur la figure 1 comporte un couvercle 1 destiné à être fixé, par exemple vissé par un filetage 2 prévu sur sa partie cylindrique, sur une embase d'un échangeur de chaleur ou d'un vase d'expansion relié à un échangeur de chaleur.The cap illustrated in FIG. 1 includes a cover 1 intended to be fixed, for example screwed by a thread 2 provided on its cylindrical part, on a base of a heat exchanger or of an expansion vessel connected to an exchanger heat.

Le couvercle 1 est muni sur sa face plane interne d'un joint d'étanchéité 3 et comporte intérieurement au volume délimité par le couvercle et à partir de cette même face, un logement 4, ici tubulaire et coaxial au couvercle 1, fermé à une de ses extrémités par une paroi plane située en vis-à-vis et à distance de la face interne dudit couvercle, ladite paroi comportant, ici perpendiculairement, une ouverture 5, ici coaxiale audit logement.The cover 1 is provided on its internal flat face with a seal 3 and internally comprises the volume delimited by the cover and from this same face, a housing 4, here tubular and coaxial with the cover 1, closed to a from its ends by a flat wall located opposite and at a distance from the internal face of said cover, said wall comprising, here perpendicularly, an opening 5, here coaxial with said housing.

Le logement 4 permet de contenir grâce à son autre extrémité ouverte, située sensiblement dans le même plan que la face plane du couvercle, un ressort 6 dont une extrémité prend appui sur la paroi plane du logement 4 et dont l'autre extrémité appuie sur un clapet de dépression 7 qui, dans l'exemple illustré, est appliqué contre la base d'un doigt 8 faisant partie d'un clapet de surpression 9, ledit doigt étant introduit à l'intérieur du logement 4.The housing 4 makes it possible to contain, by virtue of its other open end, situated substantially in the same plane as the flat face of the cover, a spring 6, one end of which bears on the flat wall of the housing 4 and the other end of which rests on a vacuum valve 7 which, in the example illustrated, is applied against the base of a finger 8 forming part of a valve overpressure 9, said finger being inserted inside the housing 4.

Le clapet de surpression 9 comporte, coaxialement avec le doigt 8, un flasque circulaire dont la face interne est pourvue d'un joint d'étanchéité 11 venant s'appuyer sur un siège annulaire 12 prévu coaxialement au logement 4 sur le dessus du couvercle 1.The pressure relief valve 9 comprises, coaxially with the finger 8, a circular flange, the internal face of which is provided with a seal 11 which comes to bear on an annular seat 12 provided coaxially with the housing 4 on the top of the cover 1 .

En outre, le clapet de surpression 9 est pourvu d'une lumière 10, par exemple coaxiale à l'ouverture 5, et débouchant au-delà du doigt 8 et du flasque circulaire dudit clapet.In addition, the pressure relief valve 9 is provided with a light 10, for example coaxial with the opening 5, and opening beyond the finger 8 and the circular flange of said valve.

Le clapet de surpression est entouré par un fourreau 13 coaxial saillant à partir du dessus du couvercle 1 et dont la partie supérieure est fermée par une capsule 14, ledit fourreau comportant au moins une ouverture 15 prévue sur sa partie tubulaire.The pressure relief valve is surrounded by a coaxial sheath 13 projecting from the top of the cover 1 and the upper part of which is closed by a capsule 14, said sheath comprising at least one opening 15 provided on its tubular part.

Dans l'exemple représenté la capsule 14 maintient une cartouche 16 traversant ladite capsule en étant coaxiale au fourreau 13 et débouchant à l'intérieur de celui-ci, ladite cartouche comportant des parties de guidage 17 pour une douille 18 contre laquelle s'appuie une extrémité d'un ressort 19 dont l'autre extrémité prend appui sur le clapet de surpression 9 de façon à appliquer celui-ci sur le siège annulaire 11.In the example shown, the capsule 14 holds a cartridge 16 passing through said capsule while being coaxial with the sheath 13 and opening out inside the latter, said cartridge comprising guide parts 17 for a socket 18 against which a end of a spring 19, the other end of which bears on the pressure relief valve 9 so as to apply the latter to the annular seat 11.

La cartouche 16 peut être constituée par différents organes, en particulier, elle peut être constituée par un élément contenant une cire dilatable ou bien elle peut être réalisée en un alliage à mémoire de forme ou par tout autre dispositif connu dans la technique pour présenter une dilatation linéaire importante dans un écart de température relativement faible.The cartridge 16 can be constituted by different organs, in particular, it can be constituted by an element containing an expandable wax or else it can be made of a shape memory alloy or by any other device known in the art for exhibiting expansion large linear in a relatively small temperature difference.

Dans l'exemple représenté à la figure 1, la cartouche 16 est munie d'une résistance électrique de chauffage 20 dont l'alimentation à partir d'une source de courant électrique 21 est contrôlée par un relais 22 pouvant être commandé, par exemple par un thermostat sensible à la température du liquide de refroidissement d'un moteur dont l'échangeur de chaleur de refroidissement est muni du bouchon décrit dans ce qui précède.In the example shown in FIG. 1, the cartridge 16 is provided with an electric heating resistor 20, the supply of which from an electric current source 21 is controlled by a relay 22 which can be controlled, for example by a thermostat sensitive to the coolant temperature of an engine with a cooling heat exchanger cap described in the above.

Lorsque le moteur est froid, les différentes parties du bouchon se trouvent dans la position illustrée à la figure 1.When the engine is cold, the different parts of the plug are in the position illustrated in Figure 1.

Lors du fonctionnement du moteur, le liquide de refroidissement est chauffé mais, normalement, les différentes parties du bouchon demeurent toujours dans la position illustrée si la pression régnant dans l'échangeur est inférieure à un seuil préalablement déterminé pour un fonctionnement normal.During engine operation, the coolant is heated but, normally, the various parts of the plug always remain in the illustrated position if the pressure in the exchanger is below a threshold previously determined for normal operation.

En cas de surchauffage du liquide de refroidissement, par exemple lorsque le moteur est sous forte charge, une augmentation de la pression, par exemple due à un début d'ébullition du liquide, peut se produire à l'intérieur de l'échangeur de chaleur, la pression étant au-dessus de la pression de tarage du clapet de surpression 9 donné par le ressort 19.If the coolant overheats, for example when the engine is under heavy load, an increase in pressure, for example due to the start of boiling of the coolant, may occur inside the heat exchanger. , the pressure being above the setting pressure of the pressure relief valve 9 given by the spring 19.

Dans ce cas, la pression appliquée sur le clapet 9, et plus particulièrement sur la surface plane du doigt 8, fait en sorte que le clapet 9 est soulevé, quitte son siège 11, et de la vapeur s'échappe en passant par l'ouverture 5 et l'ouverture 15.In this case, the pressure applied to the valve 9, and more particularly to the flat surface of the finger 8, causes the valve 9 to be raised, leaves its seat 11, and steam escapes passing through the opening 5 and opening 15.

De façon connue, lors du refroidissement du liquide, une pression inférieure à la pression atmosphérique peut s'établir à l'intérieur de l'échangeur de chaleur. Dans ce cas, le clapet de dépression 7 est ouvert momentanément pour qu'une pression appropriée soit rétablie à l'intérieur de l'échangeur de chaleur par passage de l'air extérieur à travers l'ouverture 14, la lumière 10 et l'ouverture 5.In known manner, during the cooling of the liquid, a pressure below atmospheric pressure can be established inside the heat exchanger. In this case, the vacuum valve 7 is opened momentarily so that an appropriate pressure is restored inside the heat exchanger by passage of the outside air through the opening 14, the light 10 and the opening 5.

Lorsque le moteur est arrêté après avoir travaillé sous forte charge, la température du liquide de refroidissement, dans ses chemises et dans le circuit de refroidissement, continue à croître et peut dépasser une valeur de seuil préalablement choisie. Cette valeur de seuil est détectée par le thermostat qui commande le relais 22 en assurant par suite l'alimentation en courant électrique de la résistance 20.When the engine is stopped after working under heavy load, the temperature of the coolant, in its jackets and in the cooling circuit, continues to increase and may exceed a previously selected threshold value. This threshold value is detected by the thermostat which controls the relay 22, thereby ensuring the supply of electric current to the resistor 20.

Le chauffage de la cartouche 16 provoque sa dilatation linéaire et, par conséquent, la douille 18 est amenée à la position 18a pour laquelle elle est représentée en pointillé. Dans cette position, le tarage dû au ressort 19 est modifié, ici plus grand, puisque le ressort 19 est comprimé.The heating of the cartridge 16 causes its linear expansion and, consequently, the sleeve 18 is brought to the position 18a for which it is shown in dotted lines. In this position, the calibration due to the spring 19 is modified, here larger, since the spring 19 is compressed.

Il en résulte que le clapet de surpression 9 ne peut être soulevé qu'au-delà d'un second seuil de pression correspondant au nouveau tarage du clapet 9.As a result, the pressure relief valve 9 can only be raised beyond a second pressure threshold corresponding to the new setting of the valve 9.

Dans la pratique, le second seuil de pression est choisi pour que le clapet de surpression 9 ne puisse normalement pas être soulevé sauf si la pression régnant à l'intérieur de l'échangeur de chaleur atteint une valeur telle que des parties de cet échangeur de chaleur ou du circuit auquel il est relié risquent d'être endommagées.In practice, the second pressure threshold is chosen so that the pressure relief valve 9 cannot normally be lifted unless the pressure prevailing inside the heat exchanger reaches a value such that parts of this heat exchanger heat or the circuit to which it is connected may be damaged.

La figure 2 illustre une variante selon laquelle le couvercle 1 porte le logement 4a sur son dessus.FIG. 2 illustrates a variant in which the cover 1 carries the housing 4a on its top.

Dans cette réalisation, le clapet de dépression 7 est disposé comme précédemment dans le logement 4. Le clapet de surpression 9 dont le tarage est assuré par le ressort 19 repose par sa garniture d'étanchéité 11 sur deux sièges annulaires 23,24 prévus ici sur le fond du fourreau 13 situé à distance du couvercle 1.In this embodiment, the vacuum valve 7 is arranged as before in the housing 4. The pressure valve 9 whose calibration is ensured by the spring 19 rests by its seal 11 on two annular seats 23, 24 provided here on the bottom of the sheath 13 located at a distance from the cover 1.

Comme dans l'exemple précédent, une capsule 14 ferme le fourreau 13.As in the previous example, a capsule 14 closes the sheath 13.

Un canal 25 est prévu pour déboucher, ici radialement, à l'intérieur du logement 4a et ce canal est normalement fermé par un clapet 26 qui est maintenu par un embout 27 délimitant une chambre intérieure 29 contenant ledit clapet et relié par un conduit 28 à l'admission du moteur.A channel 25 is provided to open, here radially, inside the housing 4a and this channel is normally closed by a valve 26 which is held by a nozzle 27 defining an interior chamber 29 containing said valve and connected by a conduit 28 to engine intake.

La chambre 29 communique par un conduit 30 avec l'espace séparant les deux sièges 23,24 décrits précédemment.The chamber 29 communicates by a conduit 30 with the space separating the two seats 23, 24 described above.

Lorsque le moteur comportant l'échangeur de chaleur fermé par le bouchon décrit est en fonctionnement, la dépression régnant à l'aspiration dudit moteur fait soulever le clapet 26, ouvre le canal 25 et, par conséquent, la pression régnant à l'intérieur de l'échangeur est appliquée contre le clapet de dépression 7 et contre le clapet de surpression 9 par le canal 25 et le conduit 30 sur la surface de celui-ci s'étendant entre les deux sièges 23,24.When the engine comprising the heat exchanger closed by the plug described is in operation, the vacuum prevailing at the suction of said engine causes the valve 26 to lift, opens the channel 25 and, by Consequently, the pressure prevailing inside the exchanger is applied against the vacuum valve 7 and against the pressure valve 9 by the channel 25 and the conduit 30 on the surface of the latter extending between the two seats. 23.24.

Dans ce cas, et compte tenu de la dureté du ressort 19, le clapet 9 est taré à un premier seuil de pression au-delà duquel il est admis que ledit clapet puisse s'ouvrir.In this case, and taking into account the hardness of the spring 19, the valve 9 is calibrated at a first pressure threshold beyond which it is accepted that said valve can open.

Lorsque le moteur est arrêté, après qu'il a fonctionné sous forte charge et que la température du liquide de refroidissement continue à s'élever comme exposé dans ce qui précède, la pression croît à l'intérieur du bouchon mais sa pression ne peut s'exercer que sur la surface du clapet de surpesssion 9 qui correspond à la surface du clapet de dépression 7 car, dès l'arrêt du moteur, une dépression n'est plus appliquée par le conduit 28 et le clapet 26 ferme le passage qui était établi par les conduits 25 et 30 de sorte que la pression régnant dans l'échangeur de chaleur ne peut plus s'appliquer sur la surface du clapet de surpression 9 comprise entre les deux sièges annulaires 23,24.When the engine is stopped, after it has operated under heavy load and the temperature of the coolant continues to rise as described in the above, the pressure increases inside the cap but its pressure cannot exercise only on the surface of the overpressure valve 9 which corresponds to the surface of the vacuum valve 7 because, as soon as the engine stops, a vacuum is no longer applied by the conduit 28 and the valve 26 closes the passage which was established by the conduits 25 and 30 so that the pressure prevailing in the heat exchanger can no longer be applied to the surface of the pressure relief valve 9 comprised between the two annular seats 23,24.

Les conditions ci-dessus de fonctionnement correspondent donc à celles du second seuil de pression qui empêche l'ouverture du clapet de surpression 9, sauf si la pression produite à l'intérieur de l'échangeur atteint le second seuil au-delà duquel un risque d'endommagement existerait.The above operating conditions therefore correspond to those of the second pressure threshold which prevents the opening of the pressure relief valve 9, unless the pressure produced inside the exchanger reaches the second threshold above which a risk of damage would exist.

L'invention n'est pas limitée aux exemples de réalisation représentés et décrits en détail car diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the embodiments shown and described in detail since various modifications can be made thereto without departing from its scope.

Claims (8)

1) Bouchon d'échangeur de chaleur pour la régulation de la pression à l'intérieur du circuit de refroidissement d'un moteur à combustion interne comportant au moins un clapet de surpression (9), caractérisé en ce que le clapet de surpression (9) est associé à des moyens (16,23,24,26) lui conférant un premier seuil de tarage pour un fonctionnement normal du moteur et un second seuil lorsque le moteur est arrêté.1) Heat exchanger plug for regulating the pressure inside the cooling circuit of an internal combustion engine comprising at least one pressure relief valve (9), characterized in that the pressure relief valve (9 ) is associated with means (16,23,24,26) giving it a first setting threshold for normal engine operation and a second threshold when the engine is stopped. 2) Bouchon suivant la revendication 1, caractérisé en ce que le second seuil de tarage est supérieur au premier.2) Plug according to claim 1, characterized in that the second setting threshold is greater than the first. 3) Bouchon suivant la revendication 1, caractérisé en ce qu'un clapet de surpression (9) est maintenu sur un siège (12) par un ressort (19) prenant appui contre une cartouche (16) sensible à la température du liquide de refroidissement du moteur.3) Plug according to claim 1, characterized in that a pressure relief valve (9) is held on a seat (12) by a spring (19) bearing against a cartridge (16) sensitive to the temperature of the coolant. of the motor. 4) Bouchon suivant l'une des revendications 1 et 3, caractérisé en ce que la cartouche (16) est constituée par un élément dilatable du type à cire, à mémoire de forme ou analogue.4) Cap according to one of claims 1 and 3, characterized in that the cartridge (16) consists of an expandable element of the wax type, shape memory or the like. 5) Bouchon suivant l'une des revendications 1 à 4, caractérisé en ce que la cartouche (16) est chauffée électriquement après arrêt du moteur par une résistance électrique (20) mise sous tension par un relais (22) en dépendance de la température du liquide de refroidissement du moteur.5) Plug according to one of claims 1 to 4, characterized in that the cartridge (16) is electrically heated after stopping the engine by an electrical resistance (20) energized by a relay (22) depending on the temperature engine coolant. 6) Bouchon suivant la revendication 1, caractérisé en ce que le clapet de surpression (9) est maintenu appliqué par un ressort (19) sur deux sièges annulaires espacés (23,24), l'espace compris entre lesdits deux sièges étant relié par un conduit (30) et un canal (25) à l'intérieur d'un logement (4a) dans lequel règne la pression s'exerçant en permanence contre un clapet de surpression (9), l'ouverture du conduit (30) et du canal (25) étant contrôlée par un clapet (26) relié à l'aspiration du moteur.6) Plug according to claim 1, characterized in that the pressure relief valve (9) is kept applied by a spring (19) on two spaced annular seats (23,24), the space between said two seats being connected by a duct (30) and a channel (25) inside a housing (4a) in which there is pressure constantly exerted against a pressure relief valve (9), the opening of the duct (30) and channel (25) being controlled by a valve (26) connected to the motor intake. 7) Bouchon suivant l'une des revendications 1 à 6, caractérisé en ce que le clapet de surpression (9) comporte un doigt (8) guidé dans le logement (4,4a) dans lequel est disposé un clapet de dépression (7) maintenu contre le doigt (8) par un ressort (6) de manière que ledit clapet de dépression (7) ferme une lumière (10) traversant le clapet de surpression (9), la surface dudit clapet de dépression (7) déterminant, compte tenu de la dureté du ressort (19), l'un des seuils de pression.7) Cap according to one of claims 1 to 6, characterized in that the pressure relief valve (9) has a finger (8) guided in the housing (4,4a) in which is disposed a vacuum valve (7) held against the finger (8) by a spring (6) so that said vacuum valve (7) closes a light (10) passing through the pressure relief valve (9), the surface of said vacuum valve (7) determining, counts given the hardness of the spring (19), one of the pressure thresholds. 8) Bouchon suivant les revendications 6 et 7, caractérisé en ce que le premier seuil de tarage est déterminé par la pression s'exerçant sur la surface du clapet de dépression (7) et la surface comprise entre les deux sièges annulaires (23,24).8) Plug according to claims 6 and 7, characterized in that the first setting threshold is determined by the pressure exerted on the surface of the vacuum valve (7) and the surface between the two annular seats (23,24 ).
EP88400874A 1987-04-16 1988-04-12 Radiator cap for the regulation of the cooling circuit of an engine Withdrawn EP0287450A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705439A FR2614071A1 (en) 1987-04-16 1987-04-16 METHOD FOR REGULATING THE COOLING CIRCUIT OF A HEAT ENGINE AND PLUG FOR IMPLEMENTING IT
FR8705439 1987-04-16

Publications (1)

Publication Number Publication Date
EP0287450A1 true EP0287450A1 (en) 1988-10-19

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EP88400874A Withdrawn EP0287450A1 (en) 1987-04-16 1988-04-12 Radiator cap for the regulation of the cooling circuit of an engine

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EP (1) EP0287450A1 (en)
FR (1) FR2614071A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525311A1 (en) * 1991-07-20 1993-02-03 Mercedes-Benz Ag Pressure controlled valve device and cooling circuit of an internal combustion engine
WO1999028606A1 (en) * 1997-12-03 1999-06-10 Heinrich Reutter Closing cap for motor vehicle radiator
DE19923775A1 (en) * 1999-05-22 2000-11-23 Heinrich Reutter Closing cal for vehicle radiator, with initial pressure of valve body against seal seat adjustable by controlled drive

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US1704943A (en) * 1920-12-20 1929-03-12 Pines Winterfront Co Thermostatically-controlled power-actuated means
US1968828A (en) * 1933-03-23 1934-08-07 Maxey D Moody Automatic oil and temperature control system for motor vehicles
GB497056A (en) * 1937-06-07 1938-12-07 Raymond Noel Dorey Liquid cooling systems for internal combustion engines
US2480986A (en) * 1947-05-29 1949-09-06 Gen Motors Corp Thermostatic radiator valve
US2574254A (en) * 1944-12-28 1951-11-06 Gen Motors Corp Aircraft cooling valve
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FR2388995A1 (en) * 1977-04-29 1978-11-24 Deere & Co INTERNAL COMBUSTION ENGINE WITH PRESSURE COOLING SYSTEM
EP0053003A1 (en) * 1980-11-22 1982-06-02 Imi Radiators Limited Heat exchanger
FR2504976A1 (en) * 1981-04-30 1982-11-05 Fuji Heavy Ind Ltd DEVICE FOR CONTROLLING THE TEMPERATURE OF THE COOLING WATER OF A WATER COOLED ENGINE
DE3143749A1 (en) * 1981-11-04 1983-05-11 Magirus-Deutz Ag, 7900 Ulm Device for safeguarding the water pressure in the cooling water circuit of an internal combustion engine
GB2155153A (en) * 1984-02-24 1985-09-18 Gilardini Spa Thermostat unit for the cooling circuit on a motor vehicle engine
EP0180208A2 (en) * 1984-10-29 1986-05-07 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Pressure control device for the cooling circuit of an internal-combustion engine

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704943A (en) * 1920-12-20 1929-03-12 Pines Winterfront Co Thermostatically-controlled power-actuated means
US1968828A (en) * 1933-03-23 1934-08-07 Maxey D Moody Automatic oil and temperature control system for motor vehicles
GB497056A (en) * 1937-06-07 1938-12-07 Raymond Noel Dorey Liquid cooling systems for internal combustion engines
US2574254A (en) * 1944-12-28 1951-11-06 Gen Motors Corp Aircraft cooling valve
US2480986A (en) * 1947-05-29 1949-09-06 Gen Motors Corp Thermostatic radiator valve
US2799260A (en) * 1955-10-13 1957-07-16 Charles R Butler Cooling system for internal combustion engines
FR2388995A1 (en) * 1977-04-29 1978-11-24 Deere & Co INTERNAL COMBUSTION ENGINE WITH PRESSURE COOLING SYSTEM
EP0053003A1 (en) * 1980-11-22 1982-06-02 Imi Radiators Limited Heat exchanger
FR2504976A1 (en) * 1981-04-30 1982-11-05 Fuji Heavy Ind Ltd DEVICE FOR CONTROLLING THE TEMPERATURE OF THE COOLING WATER OF A WATER COOLED ENGINE
DE3143749A1 (en) * 1981-11-04 1983-05-11 Magirus-Deutz Ag, 7900 Ulm Device for safeguarding the water pressure in the cooling water circuit of an internal combustion engine
GB2155153A (en) * 1984-02-24 1985-09-18 Gilardini Spa Thermostat unit for the cooling circuit on a motor vehicle engine
EP0180208A2 (en) * 1984-10-29 1986-05-07 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Pressure control device for the cooling circuit of an internal-combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0525311A1 (en) * 1991-07-20 1993-02-03 Mercedes-Benz Ag Pressure controlled valve device and cooling circuit of an internal combustion engine
WO1999028606A1 (en) * 1997-12-03 1999-06-10 Heinrich Reutter Closing cap for motor vehicle radiator
US6435367B1 (en) 1997-12-03 2002-08-20 Heinrich Reutter Closing cap for motor vehicle radiator
DE19923775A1 (en) * 1999-05-22 2000-11-23 Heinrich Reutter Closing cal for vehicle radiator, with initial pressure of valve body against seal seat adjustable by controlled drive
WO2000071872A1 (en) * 1999-05-22 2000-11-30 Heinrich Reutter Closure cap for a motor vehicle radiator
EP1233158A1 (en) * 1999-05-22 2002-08-21 REUTTER, Heinrich Closure cap for a motor vehicle radiator
US6729271B1 (en) 1999-05-22 2004-05-04 Heinrich Reutter Closure cap for a motor vehicle radiator

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