EP0581683A1 - Cooling device for an internal combustion engine with a condenser - Google Patents

Cooling device for an internal combustion engine with a condenser Download PDF

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Publication number
EP0581683A1
EP0581683A1 EP93401973A EP93401973A EP0581683A1 EP 0581683 A1 EP0581683 A1 EP 0581683A1 EP 93401973 A EP93401973 A EP 93401973A EP 93401973 A EP93401973 A EP 93401973A EP 0581683 A1 EP0581683 A1 EP 0581683A1
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EP
European Patent Office
Prior art keywords
condenser
fluid
outlet
pipe
way 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Withdrawn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
EP93401973A
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German (de)
French (fr)
Inventor
Srun Ngy Ap
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 Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur 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 Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0581683A1 publication Critical patent/EP0581683A1/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Withdrawn legal-status Critical Current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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • 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
    • 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
    • F01P11/029—Expansion reservoirs
    • 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
    • F01P2003/2292—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point with thermostatically controlled by-pass
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P2007/168—By varying the cooling capacity of a liquid-to-air heat-exchanger
    • 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/52—Heat exchanger temperature
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler

Definitions

  • the invention relates to a device for cooling a heat engine, comprising a condenser for a coolant capable of circulating in the liquid phase and in the vapor phase, a fluid circulation pump and an expansion tank.
  • a device of this type in which a phase separator separates the liquid phase and the vapor phase from the fluid leaving the engine, the vapor phase being sent to the condenser to be condensed and cooled and the liquid phase being directed to the vessel. expansion and thence returning to the engine without passing through the condenser.
  • the fluid cooled by this known device before entering the engine, passes through a heating radiator, at least when it is necessary in winter to heat the passenger compartment of the vehicle.
  • a heating radiator At least when it is necessary in winter to heat the passenger compartment of the vehicle.
  • this fluid is condensed and cooled in the condenser to a temperature which may be too low to allow sufficient heating of the passenger compartment.
  • the object of the invention is to remedy this drawback, while maintaining the modulation of the heat flow given off by the cooling fluid in the condenser as a function of the engine load.
  • the invention relates in particular to a device of the type defined in the introduction, further comprising a three-way thermostatic valve controlled by the temperature of the fluid, operating between a first position and a second position in which, respectively, the fluid in liquid phase coming from the motor avoids the condenser, for the lowest temperatures, and passes through it, for the highest temperatures, said three-way valve being associated with a second thermostatic valve suitable for deviating a fraction from the condenser, decreasing function of the temperature of the fluid, of the fluid flow admitted by that of the tracks of the three-way valve which is connected to the condenser.
  • the adjustment of the three-way van allows a fraction of the fluid to flow through the condenser the higher the temperature of the latter. However, there is always a fraction of the fluid which does not pass through the condenser, thus avoiding excessive cooling, either that the three-way valve is out of its second position, or that it is in this position and that the second valve thermostatic in turn deflects part of the fluid out of the condenser.
  • FIGS. 1, 2 and 3 are diagrams showing the configuration of a cooling device according to the invention for different temperatures of the coolant.
  • the illustrated cooling device is intended to cool the heat engine 1 of a motor vehicle. It uses a cooling fluid which circulates between the engine 1 and a condenser 2 filled with this fluid, the latter entering the engine in the liquid phase by an inlet 3 and coming out, via an outlet 4, if necessary at least partially in vapor phase, depending on engine operating conditions.
  • a line 5 brings the fluid from the outlet 4 to a single inlet 6 of a three-way thermostatic valve 7.
  • a line 8 connects a first outlet 9 of this valve to an inlet 10 of the condenser which opens into an inlet chamber 11. After possible condensation in the condenser, the fluid leaves it through an outlet 12 opening into an outlet chamber 13.
  • a pipe 14 connects the outlet 12 to a circulation pump 15.
  • a pipe 16 brings the liquid from the pump 15 to the engine inlet 3 through a radiator for heating the passenger compartment 17.
  • a water-oil exchanger 18, used for cooling the lubricating oil of the engine 1, is interposed on a line 19 which is connected in bypass between line 16 and line 5. The flow of fluid produced by the pump 15 is therefore shared between a fraction passing through the motor 1 and a fraction passing through the exchanger 18.
  • a pipe 20 starts from a second outlet 21 of the three-way thermostatic valve and is connected to the pipe 14.
  • the valve 7 comprises a shutter member 22 which moves, as a function of the temperature of the fluid, between two extreme positions, namely a first position illustrated in the figure 1, in which it closes the outlet 9, and a second position illustrated in FIG. 3, in which it closes the outlet 21.
  • the inlet chamber 11 of the condenser also has an outlet 34 from which a pipe 35 is connected, connecting to the pipe 14.
  • a pipe 35 In this pipe 35 is interposed a thermostatic valve 36, which is fully open at low temperature and which gradually closes when the temperature of the fluid increases.
  • the shutter member 22 is in an intermediate position, as shown in FIG. 2.
  • pipe 35 and the thermostatic valve 36 can be integrated into the bulkhead of the condenser 2.
  • the illustrated device also comprises an expansion tank 23 having a variable internal volume thanks to a deformable membrane 24, this internal volume containing coolant in the liquid phase 25.
  • the expansion tank is connected by a degassing pipe 26 to line 20, and via a return line 28 to line 14, these lines 26 and 28 being lower than the expansion tank.
  • the outlet 21 of the three-way valve When the outlet 21 of the three-way valve is open, the air which can be mixed with the fluid leaving the engine can rise through line 26 and collect at 29 in the interior volume of the expansion tank; above the liquid 25. Closing the outlet 21 at high temperature prevents the passage of fluid in the vapor phase to the expansion vessel.
  • the device also comprises, in a manner known per se, a thermocontact 30 placed on the pipe 14 to control, as a function of the temperature, a fan unit 31 intended to accelerate the circulation of cooling air through the condenser 2, a thermocontact 32 placed on line 5, near outlet 4 of the engine, to signal an abnormally high temperature, and a liquid level detector 33 mounted on the bottom of the expansion tank 23 and suitable for providing a signal when it does not contain no liquid, indicating that the quantity of fluid in the cooling circuit is insufficient.
  • a thermocontact 30 placed on the pipe 14 to control, as a function of the temperature
  • a fan unit 31 intended to accelerate the circulation of cooling air through the condenser 2
  • a thermocontact 32 placed on line 5, near outlet 4 of the engine, to signal an abnormally high temperature
  • a liquid level detector 33 mounted on the bottom of the expansion tank 23 and suitable for providing a signal when it does not contain no liquid, indicating that the quantity of fluid in the cooling circuit is insufficient.

Abstract

A thermostatic three-way valve (12) allows a fraction of the flow rate of cooling fluid leaving the engine (1) of a vehicle, which fraction is a decreasing function of the temperature of the fluid, to short-circuit the condenser (2). In addition, a second thermostatic valve (36) with progressive closure, when the three-way valve is in its position forcing the fluid in liquid phase to pass through the condenser, still allows a certain quantity of fluid to pass out of the condenser so that the fluid returned to the engine and passing through a heating radiator (17) is at a sufficient temperature to provide effective heating of the passenger compartment of the vehicle.

Description

L'invention concerne un dispositif de refroidissement d'un moteur thermique, comprenant un condenseur pour un fluide de refroidissement propre à circuler en phase liquide et en phase vapeur, une pompe de circulation du fluide et un vase d'expansion.The invention relates to a device for cooling a heat engine, comprising a condenser for a coolant capable of circulating in the liquid phase and in the vapor phase, a fluid circulation pump and an expansion tank.

On connaît un dispositif de ce genre, dans lequel un séparateur de phases sépare la phase liquide et la phase vapeur du fluide sortant du moteur, la phase vapeur étant envoyée dans le condenseur pour être condensée et refroidie et la phase liquide étant dirigée vers le vase d'expansion et de là retournant au moteur sans passer par le condenseur.A device of this type is known, in which a phase separator separates the liquid phase and the vapor phase from the fluid leaving the engine, the vapor phase being sent to the condenser to be condensed and cooled and the liquid phase being directed to the vessel. expansion and thence returning to the engine without passing through the condenser.

Le fluide refroidi par ce dispositif connu, avant de rentrer dans le moteur, traverse un radiateur de chauffage, au moins quand il est nécessaire en hiver de chauffer l'habitacle du véhicule. Lorsque la charge du moteur est forte et que le fluide qui en sort est pratiquement entièrement en phase vapeur, ce fluide est condensé et refroidi dans le condenseur jusqu'à une température qui peut être trop basse pour permettre un chauffage suffisant de l'habitacle.The fluid cooled by this known device, before entering the engine, passes through a heating radiator, at least when it is necessary in winter to heat the passenger compartment of the vehicle. When the engine load is high and the fluid leaving it is almost entirely in the vapor phase, this fluid is condensed and cooled in the condenser to a temperature which may be too low to allow sufficient heating of the passenger compartment.

Le but de l'invention est de remédier à cet inconvénient, tout en maintenant la modulation du débit de chaleur cédée par le fluide de refroidissement dans le condenseur en fonction de la charge du moteur.The object of the invention is to remedy this drawback, while maintaining the modulation of the heat flow given off by the cooling fluid in the condenser as a function of the engine load.

L'invention vise notamment un dispositif du genre défini en introduction, comprenant en outre une vanne thermostatique à trois voies commandée par la température du fluide, fonctionnant entre une première position et une seconde position dans lesquelles, respectivement, le fluide en phase liquide provenant du moteur évite le condenseur, pour les températures les plus basses, et traverse celui-ci, pour les températures les plus élevées, ladite vanne à trois voies étant associée à une seconde vanne thermostatique propre à dévier hors du condenseur une fraction, fonction décroissante de la température du fluide, du débit de fluide admis par celle des voies de la vanne à trois voies qui est reliée au condenseur.The invention relates in particular to a device of the type defined in the introduction, further comprising a three-way thermostatic valve controlled by the temperature of the fluid, operating between a first position and a second position in which, respectively, the fluid in liquid phase coming from the motor avoids the condenser, for the lowest temperatures, and passes through it, for the highest temperatures, said three-way valve being associated with a second thermostatic valve suitable for deviating a fraction from the condenser, decreasing function of the temperature of the fluid, of the fluid flow admitted by that of the tracks of the three-way valve which is connected to the condenser.

Le réglage de la van ne à trois voies permet de faire passer dans le condenseur une fraction du fluide d'autant plus grande que la température de celui-ci est plus élevée. Cependant, il reste toujours une fraction du fluide qui ne traverse pas le condenseur, évitant ainsi un refroidissement trop poussé, soit que la vanne à trois voies soit hors de sa seconde position, soit qu'elle soit dans cette position et que la seconde vanne thermostatique dévie à son tour une partie du fluide hors du condenseur.The adjustment of the three-way van allows a fraction of the fluid to flow through the condenser the higher the temperature of the latter. However, there is always a fraction of the fluid which does not pass through the condenser, thus avoiding excessive cooling, either that the three-way valve is out of its second position, or that it is in this position and that the second valve thermostatic in turn deflects part of the fluid out of the condenser.

D'autres caractéristiques, complémentaires ou alternatives, du dispositif selon l'invention sont énoncées ci-après :

  • - Il comprend une conduite de départ pour amener le fluide sortant du moteur à une entrée unique de la vanne à trois voies, une conduite d'entrée allant d'une première sortie de la vanne à trois voies, fermée pour les températures les plus basses, à une entrée du condenseur, une conduite de sortie reliant une sortie du condenseur au moteur, et une première conduite de dérivation reliant une seconde sortie de la vanne à trois voies, fermée pour les températures les plus élevées, à la conduite de sortie.
  • - La pompe est montée dans la conduite de sortie, en aval de l'embranchement de la première conduite de dérivation.
  • - La conduite d'entrée et la conduite de sortie débouchent respectivement dans une chambre d'entrée et dans une chambre de sortie du condenseur, et que la seconde vanne thermostatique est montée dans une seconde conduite de dérivation reliant ladite chambre d'entrée à la conduite de sortie, en amont de l'embranchement de la première conduite de dérivation.
  • - Il comprend une conduite de dégazage débouchant dans le vase d'expansion et reliée à la première conduite de dérivation.
Other characteristics, complementary or alternative, of the device according to the invention are set out below:
  • - It includes a flow line to bring the fluid leaving the engine to a single inlet of the three-way valve, an inlet line from a first outlet of the three-way valve, closed for the lowest temperatures , at an inlet of the condenser, an outlet pipe connecting an outlet of the condenser to the motor, and a first bypass pipe connecting a second outlet of the three-way valve, closed for the highest temperatures, to the outlet pipe.
  • - The pump is mounted in the outlet pipe, downstream of the branch of the first bypass pipe.
  • - The inlet pipe and the outlet pipe lead respectively into an inlet chamber and into an outlet chamber of the condenser, and that the second thermostatic valve is mounted in a second bypass duct connecting said inlet chamber to the outlet pipe, upstream of the branch of the first bypass pipe.
  • - It includes a degassing pipe opening into the expansion tank and connected to the first bypass pipe.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'examen de la description détaillée ci-après, et des dessins annexés, sur lesquels les figures 1, 2 et 3 sont des schémas montrant la configuration d'un dispositif de refroidissement selon l'invention pour différentes températures du fluide de refroidissement.Other characteristics and advantages of the invention will appear on examining the detailed description below, and the appended drawings, in which FIGS. 1, 2 and 3 are diagrams showing the configuration of a cooling device according to the invention for different temperatures of the coolant.

Les mêmes éléments sont représentés dans les trois figures, et ils sont désignés par les mêmes numéros de référence.The same elements are shown in the three figures, and they are designated by the same reference numbers.

Le dispositif de refroidissement illustré est destiné à refroidir le moteur thermique 1 d'un véhicule automobile. Il utilise un fluide de refroidissement qui circule entre le moteur 1 et un condenseur 2 rempli de ce fluide, ce dernier entrant dans le moteur en phase liquide par une entrée 3 et en ressortant, par une sortie 4, le cas échéant au moins partiellement en phase vapeur, en fonction des conditions de fonctionnement du moteur.The illustrated cooling device is intended to cool the heat engine 1 of a motor vehicle. It uses a cooling fluid which circulates between the engine 1 and a condenser 2 filled with this fluid, the latter entering the engine in the liquid phase by an inlet 3 and coming out, via an outlet 4, if necessary at least partially in vapor phase, depending on engine operating conditions.

Une conduite 5 amène le fluide de la sortie 4 à une entrée unique 6 d'une vanne thermostatique à trois voies 7. Une conduite 8 relie une première sortie 9 de cette vanne à une entrée 10 du condenseur qui débouche dans une chambre d'entrée 11. Après condensation éventuelle dans le condenseur, le fluide en ressort par une sortie 12 débouchant dans une chambre de sortie 13. Une conduite 14 relie la sortie 12 à une pompe de circulation 15. Une conduite 16 ramène le liquide de la pompe 15 à l'entrée 3 du moteur à travers un radiateur de chauffage de l'habitacle 17. Un échangeur eau-huile 18, servant au refroidissement de l'huile de lubrification du moteur 1, est interposé sur une conduite 19 qui est branchée en dérivation entre la conduite 16 et la conduite 5. Le débit de fluide produit par la pompe 15 est donc partagé entre une fraction traversant le moteur 1 et une fraction traversant l'échangeur 18.A line 5 brings the fluid from the outlet 4 to a single inlet 6 of a three-way thermostatic valve 7. A line 8 connects a first outlet 9 of this valve to an inlet 10 of the condenser which opens into an inlet chamber 11. After possible condensation in the condenser, the fluid leaves it through an outlet 12 opening into an outlet chamber 13. A pipe 14 connects the outlet 12 to a circulation pump 15. A pipe 16 brings the liquid from the pump 15 to the engine inlet 3 through a radiator for heating the passenger compartment 17. A water-oil exchanger 18, used for cooling the lubricating oil of the engine 1, is interposed on a line 19 which is connected in bypass between line 16 and line 5. The flow of fluid produced by the pump 15 is therefore shared between a fraction passing through the motor 1 and a fraction passing through the exchanger 18.

Une conduite 20 part d'une seconde sortie 21 de la vanne thermostatique à trois voies et se raccorde à la conduite 14. La vanne 7 comporte un organe d'obturation 22 qui se déplace, en fonction de la température du fluide, entre deux positions extrêmes, à savoir une première position illustrée à la figure 1, dans laquelle il obture la sortie 9, et une seconde position illustrée à la figure 3, dans laquelle il obture la sortie 21.A pipe 20 starts from a second outlet 21 of the three-way thermostatic valve and is connected to the pipe 14. The valve 7 comprises a shutter member 22 which moves, as a function of the temperature of the fluid, between two extreme positions, namely a first position illustrated in the figure 1, in which it closes the outlet 9, and a second position illustrated in FIG. 3, in which it closes the outlet 21.

La chambre d'entrée 11 du condenseur présente également une sortie 34 d'où part une conduite 35 se raccordant à la conduite 14. Dans cette conduite 35 est interposée une vanne thermostatique 36, qui est entièrement ouverte à basse température et qui se ferme progressivement lorsque la température du fluide augmente.The inlet chamber 11 of the condenser also has an outlet 34 from which a pipe 35 is connected, connecting to the pipe 14. In this pipe 35 is interposed a thermostatic valve 36, which is fully open at low temperature and which gradually closes when the temperature of the fluid increases.

Lors du démarrage à froid du moteur 1, le fluide de refroidissement qui en sort est à basse température, et l'organe d'obturation 22 de la vanne à trois voies est dans sa première position obturant l'entrée 11. Le fluide ne peut circuler dans le condenseur et passe en totalité par la sortie 21 de la vanne à trois voies et dans la conduite 20. Cette position est maintenue, dans l'exemple décrit, jusqu'à une température de 95°C, permettant ainsi un échauffement rapide du moteur.When the engine 1 is cold started, the coolant which leaves it is at low temperature, and the shutter member 22 of the three-way valve is in its first position closing the inlet 11. The fluid cannot circulate in the condenser and pass entirely through the outlet 21 of the three-way valve and in the line 20. This position is maintained, in the example described, up to a temperature of 95 ° C., thus allowing rapid heating of the motor.

Entre cette température et celle de 102°C, qui correspond à peu près à la température d'ébullition du fluide, l'organe d'obturation 22 est dans une position intermédiaire, comme montré à la figure 2. Une fraction du débit de fluide sortant du moteur, fonction croissante de la température de ce fluide, sort de la vanne à trois voies par la sortie 9 dans la conduite 8, traverse le condenseur et en ressort par la conduite 14, la fraction restante passant par la sortie 21 et la conduite 20, ce qui assure une régulation de la température du fluide traversant le radiateur 17 et entrant dans le moteur.Between this temperature and that of 102 ° C, which roughly corresponds to the boiling temperature of the fluid, the shutter member 22 is in an intermediate position, as shown in FIG. 2. A fraction of the fluid flow leaving the engine, increasing function of the temperature of this fluid, leaves the three-way valve via outlet 9 in line 8, passes through the condenser and out through line 14, the remaining fraction passing through outlet 21 and line 20, which regulates the temperature of the fluid passing through the radiator 17 and entering the engine.

Enfin, lorsque la température est supérieure à 102°C, ce qui correspond à une charge élevée du mo- teuret à l'arrivée de fluide en phase vapeur à la vanne à trois voies et au condenseur, l'organe d'obturation 22 ferme la sortie 21 de la vanne 7, de sorte que la totalité du fluide pénètre dans la chambre d'entrée 11 du condenseur. Cependant, tant que la vanne thermostatique 36 n'est pas entièrement fermée, une partie de ce fluide ressort de la chambre 11 par la sortie 34, sans avoir cédé une quantité de chaleur notable, et s'écoule dans la conduite 35. Ce fluide se mélange dans la conduite 14 au fluide en phase liquide sortant de la chambre 13 du condenseur et le réchauffe quelque peu, ce qui permet de conserver pour le radiateur de chauffage 17 une efficacité suffisante.Finally, when the temperature is above 102 ° C., which corresponds to a high engine load and to the arrival of fluid in vapor phase at the three-way valve and at the condenser, the shutter member 22 closes. the outlet 21 of the valve 7, so that all of the fluid enters the inlet chamber 11 of the condenser. However, as long as the thermostatic valve 36 is not fully closed, part of this fluid leaves the chamber 11 through the outlet 34, without having yielded a significant amount of heat, and flows into line 35. This fluid mixes in the line 14 with the liquid phase fluid leaving the chamber 13 of the condenser and warms it up somewhat, which allows the heating radiator 17 to be kept sufficiently efficient.

En pratique, la conduite 35 et la vanne thermostatique 36 peuvent être intégrées à la cloison du condenseur2.In practice, the pipe 35 and the thermostatic valve 36 can be integrated into the bulkhead of the condenser 2.

Le dispositif illustré comprend encore un vase d'expansion 23 présentant un volume intérieur variable grâce à une membrane déformable 24, ce volume intérieur contenant du fluide de refroidissement en phase liquide 25. Le vase d'expansion est relié par une conduite de dégazage 26 à la conduite 20, et par une conduite de retour 28 à la conduite 14, ces conduites 26 et28 etant plus bas que le vase d'expansion. Lorsque la sortie 21 de la vanne à trois voies est ouverte, l'air qui peut être mélangé au fluide sortant du moteur peut monter par la conduite 26 et se rassembler en 29 dans le volume intérieur du vase d'expansion; au-dessus du liquide 25. La fermeture de la sortie 21 à température élevée interdit le passage de fluide en phase vapeur vers le vase d'expansion.The illustrated device also comprises an expansion tank 23 having a variable internal volume thanks to a deformable membrane 24, this internal volume containing coolant in the liquid phase 25. The expansion tank is connected by a degassing pipe 26 to line 20, and via a return line 28 to line 14, these lines 26 and 28 being lower than the expansion tank. When the outlet 21 of the three-way valve is open, the air which can be mixed with the fluid leaving the engine can rise through line 26 and collect at 29 in the interior volume of the expansion tank; above the liquid 25. Closing the outlet 21 at high temperature prevents the passage of fluid in the vapor phase to the expansion vessel.

Le dispositif comprend également, de façon connue en soi, un thermocontact 30 placé sur la conduite 14 pour commander en fonction de la température un groupe motoventilateur 31 destiné à accélérer la circulation d'air de refroidissement à travers le condenseur 2, un thermocontact 32 placé sur la conduite 5, près de la sortie 4 du moteur, pour signaler une température anormalement élevée, et un détecteur de niveau de liquide 33 monté sur le fond du vase d'expansion 23 et propre à fournir un signal lorsque celui-ci ne contient pas de liquide, indiquant ainsi que la quantité de fluide dans le circuit de refroidissement est insuffisante.The device also comprises, in a manner known per se, a thermocontact 30 placed on the pipe 14 to control, as a function of the temperature, a fan unit 31 intended to accelerate the circulation of cooling air through the condenser 2, a thermocontact 32 placed on line 5, near outlet 4 of the engine, to signal an abnormally high temperature, and a liquid level detector 33 mounted on the bottom of the expansion tank 23 and suitable for providing a signal when it does not contain no liquid, indicating that the quantity of fluid in the cooling circuit is insufficient.

Claims (5)

1. Dispositif de refroidissement d'un moteur thermique (1), comprenant un condenseur (2) pour un fluide de refroidissement propre à circuler en phase liquide et en phase vapeur, une pompe (15) de circulation du fluide et un vase d'expansion (23), caractérisé en ce qu'il comprend en outre une vanne thermostatique à trois voies (7) commandée par la température du fluide, fonctionnant entre une première position et une seconde position dans lesquelles, respectivement, le fluide en phase liquide provenant du moteur évite le condenseur, pour les températures les plus basses, et traverse celui-ci, pour les températures les plus élevées, ladite vanne à trois voies étant associée à une seconde vanne thermostatique (36) propre à dévier hors du condenseur une fraction, fonction décroissante de la température du fluide, du débit de fluide admis parcelle (9) des voies de la vanne à trois voies qui est reliée au condenseur.1. A cooling device for a heat engine (1), comprising a condenser (2) for a cooling fluid capable of circulating in the liquid phase and in the vapor phase, a pump (15) for circulating the fluid and a vessel for expansion (23), characterized in that it further comprises a three-way thermostatic valve (7) controlled by the temperature of the fluid, operating between a first position and a second position in which, respectively, the fluid in liquid phase originating of the motor avoids the condenser, for the lowest temperatures, and passes through it, for the highest temperatures, said three-way valve being associated with a second thermostatic valve (36) capable of deviating a fraction from the condenser, decreasing function of the temperature of the fluid, of the flow of admitted fluid parcel (9) of the tracks of the three-way valve which is connected to the condenser. 2. Dispositif selon la revendication 1, caractérisé en ce qu'il comprend une conduite de départ (5) pour amener le fluide sortant du moteur à une entrée unique (6) de la vanne à trois voies, une conduite d'entrée (8) allant d'une première sortie (9) de la vanne à trois voies, fermée pour les températures les plus basses, à une entrée (10) du condenseur, une conduite de sortie (14,16) reliant une sortie (12) du condenseur au moteur, et une première conduite de dérivation (20) reliant une seconde sortie (21) de la vanne à trois voies, fermée pour les températures les plus élevées, à la conduite de sortie.2. Device according to claim 1, characterized in that it comprises a starting pipe (5) for bringing the fluid leaving the engine to a single inlet (6) of the three-way valve, an inlet pipe (8 ) going from a first outlet (9) of the three-way valve, closed for the lowest temperatures, to an inlet (10) of the condenser, an outlet pipe (14,16) connecting an outlet (12) from the condenser to the motor, and a first bypass line (20) connecting a second outlet (21) of the three-way valve, closed for the highest temperatures, to the outlet pipe. 3. Dispositif selon la revendication 2, caractérisé en ce que la pompe est montée dans la conduite de sortie, en aval de l'embranchement de la première conduite de dérivation.3. Device according to claim 2, characterized in that the pump is mounted in the outlet pipe, downstream of the branch of the first bypass pipe. 4. Dispositif selon l'une des revendications 2 et 3, caractérisé en ce que la conduite d'entrée et la conduite de sortie débouchent respectivement dans une chambre d'entrée (11) et dans une chambre de sortie (13) du condenseur, et que la seconde vanne thermostatique (36) est montée dans une seconde conduite de dérivation (35) reliant ladite chambre d'entrée à la conduite de sortie, en amont de l'embranchement de la première conduite de dérivation.4. Device according to one of claims 2 and 3, characterized in that the inlet pipe and the outlet pipe open respectively into an inlet chamber (11) and into an outlet chamber (13) of the condenser, and that the second thermostatic valve (36) is mounted in a second bypass line (35) connecting said inlet chamber to the outlet line, upstream of the branch of the first bypass line. 5. Dispositif selon l'une des revendications 2 à 4, caractérisé en ce qu'il comprend une conduite de dégazage (26) débouchant dans le vase d'expansion et reliée à la première conduite de dérivation.5. Device according to one of claims 2 to 4, characterized in that it comprises a degassing pipe (26) opening into the expansion tank and connected to the first bypass pipe.
EP93401973A 1992-07-29 1993-07-29 Cooling device for an internal combustion engine with a condenser Withdrawn EP0581683A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9209409A FR2694338B1 (en) 1992-07-29 1992-07-29 Cooling device for a heat engine fitted with a condenser.
FR9209409 1992-07-29

Publications (1)

Publication Number Publication Date
EP0581683A1 true EP0581683A1 (en) 1994-02-02

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EP93401973A Withdrawn EP0581683A1 (en) 1992-07-29 1993-07-29 Cooling device for an internal combustion engine with a condenser

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EP (1) EP0581683A1 (en)
JP (1) JPH06200759A (en)
FR (1) FR2694338B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109815596A (en) * 2019-01-26 2019-05-28 上海交通大学 Semiconductor devices environment temperature simulation system and method based on temperature-controlled radiator
EP2118463B1 (en) * 2007-02-09 2020-01-08 Volvo Lastvagnar Ab Coolant system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010014389A (en) * 2008-07-07 2010-01-21 Mitsubishi Heavy Ind Ltd Engine-driven type refrigerating device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR581617A (en) * 1923-05-18 1924-12-03 Daimler Motoren Water cooling by backflow in combustion engines
FR808109A (en) * 1935-07-12 1937-01-29 Cooling process with indirect vaporization of an auxiliary refrigerant
FR2481791A1 (en) * 1980-05-05 1981-11-06 Ferodo Sa HEAT EXCHANGER, ESPECIALLY FOR A COOLING CIRCUIT OF A MOTOR VEHICLE ENGINE
DE4040323A1 (en) * 1990-12-17 1992-06-25 Volkswagen Ag Thermostatic valve for engine cooling system - is designed to provide limited by=pass flow of coolant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR581617A (en) * 1923-05-18 1924-12-03 Daimler Motoren Water cooling by backflow in combustion engines
FR808109A (en) * 1935-07-12 1937-01-29 Cooling process with indirect vaporization of an auxiliary refrigerant
FR2481791A1 (en) * 1980-05-05 1981-11-06 Ferodo Sa HEAT EXCHANGER, ESPECIALLY FOR A COOLING CIRCUIT OF A MOTOR VEHICLE ENGINE
DE4040323A1 (en) * 1990-12-17 1992-06-25 Volkswagen Ag Thermostatic valve for engine cooling system - is designed to provide limited by=pass flow of coolant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2118463B1 (en) * 2007-02-09 2020-01-08 Volvo Lastvagnar Ab Coolant system
CN109815596A (en) * 2019-01-26 2019-05-28 上海交通大学 Semiconductor devices environment temperature simulation system and method based on temperature-controlled radiator

Also Published As

Publication number Publication date
FR2694338A1 (en) 1994-02-04
JPH06200759A (en) 1994-07-19
FR2694338B1 (en) 1994-09-30

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