EP0888494B1 - Cooling system for a liquid-cooled internal combustion engine - Google Patents

Cooling system for a liquid-cooled internal combustion engine Download PDF

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Publication number
EP0888494B1
EP0888494B1 EP97914252A EP97914252A EP0888494B1 EP 0888494 B1 EP0888494 B1 EP 0888494B1 EP 97914252 A EP97914252 A EP 97914252A EP 97914252 A EP97914252 A EP 97914252A EP 0888494 B1 EP0888494 B1 EP 0888494B1
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EP
European Patent Office
Prior art keywords
valve
cooling system
coolant
disposed
venting
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EP97914252A
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German (de)
French (fr)
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EP0888494A1 (en
Inventor
Werner Lugs
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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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
    • F01P11/029—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
    • 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
    • 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

Definitions

  • the invention is based on the preamble of claim 1 of EP-A 0295445.
  • a flow line is used Container of air and fuel gas separation from the coolant, the separated Gases by means of a pressure relief valve in one against a closure the filler neck of this container elastically supported valve unit an atmospheric expansion, storage and air lock tank are fed.
  • This expansion tank contains a coolant supply an expansion volume that is less than a predetermined positive pressure standing gas cushion is fulfilled.
  • Expansion tank with at least partially elastically compliant devices are known from US 3238932 and DD-PS 136280.
  • the necessary pressure build-up takes place in the respective Cooling system by compressing a buffer air / gas volume preferably in the expansion tank.
  • the disadvantage here is a relatively large one Expansion volume to measure the volume increase of the coolant even under extreme Temperature conditions, such as reheating when the heat is off Internal combustion engine to be able to record a possible coolant ejection or prevent coolant loss. Since the pressure build-up is essential of the volume distribution in the expansion tank between the coolant supply and buffer air / gas volume is also determined taking into account Leakage and evaporation losses a minimum level in the expansion tank required. The requirement for large buffer air / gas volume and sufficient Minimum coolant supply results in a relatively large expansion tank, which is difficult to place in the engine compartment due to its space requirements and possibly unfavorable line arrangements.
  • the invention has for its object that generic cooling system in this regard to improve that in the cooling system to avoid premature boiling and to avoid pump cavitation required pressure without a preloaded buffer air / gas volume is achieved.
  • the advantage of the invention is in the combination of a mechanical stress generated in the coolant with to see a flow system pressure control, the pressure control in achieves an atmospheric and thus pressureless coolant supply is. This results in an advantageously small-sized filling, venting and pressure control device, which are preferably in the cooling system flow from the internal combustion engine is arranged to the cooler.
  • the compensation chamber with the Vent chamber and return valve connecting and a according to one Partial feature of claim 3, the flow line of the cooling system with the Vent and return valve connecting the feed chamber are each as one Thermal valve designed, the gas and from a predetermined operating temperature Prevent coolant exchange and thus safe opening of the Coolant supply chamber contribute advantageously.
  • claim 5 describes the displaceable limitation of the compensation chamber as a displacer piston arranged with this in a coolant-tight manner via a rolling bellows, which is acted upon by a prestressed compression spring.
  • the preload the compression spring can be chosen so that until the through generated thermal change in volume of the coolant in the cooling system Pressure predetermined height a correspondingly small displacement of the displacer given is.
  • a cooling system 1 for a liquid-cooled internal combustion engine 2 comprises one Flow 3 to the radiator 4 and from this back to the internal combustion engine 2 Return 5, which is connected to a housing 6 of a thermostat 7. Out the housing 6 with the short circuit 8 closing due to operation Thermostats 7 the coolant flows through a suction line 9 to a pump 10, which conveys the coolant into the internal combustion engine 2.
  • the device 11 comprises a container 12, which of a flow line 13 connected to the flow line 3 is penetrated.
  • the lead pipe 13 has a fixed valve socket 14, which has a partition 15 of the container 12 is arranged sealingly and with its valve opening 16 into a chamber 17 for an atmospheric coolant supply 18 flows.
  • the container 12 has a further, geodetically deeper arranged chamber 19, which by means of an elastic resistance a compression spring 20 displaceable displacer 21 a coolant volume compensation serves.
  • the displacement piston 21 is by means of a rolling bellows 22 assigned coolant-tight to the compensation chamber 19.
  • This compensation chamber 19 is connected via a connecting piece 23 and a line 23 'with the pump suction line 9 shown in Figure 1 in coolant-carrying Connection.
  • the compensation chamber 19 is provided with the coolant supply chamber 17 connected via a temperature-controlled vent and return valve 24.
  • Such thermal valves are known to be, for example, with a bimetal element equipped, which brings a ball valve into the closed position and stops after being exceeded a predetermined temperature.
  • valve stub 14 of the flow line 13 is for controlling the valve opening 16 a valve unit 25 against the resistance of one against one in a filler neck 26 of the plenum 17 screwed insert 27 supported Spring 28 arranged displaceably.
  • the valve unit 25 itself serves System pressure control of the cooling system 1 as in the atmospheric ventilated Coolant supply chamber 17 opening pressure relief valve 29.
  • the valve unit 25 further includes a vent and return valve 30, which as Thermo valve of the above-described configuration between the plenum 17 and the flow line 13 effective vent and return hole 31 in controls the pressure relief valve 29 designed as a seat valve depending on the temperature.
  • a vent and return valve 30 which as Thermo valve of the above-described configuration between the plenum 17 and the flow line 13 effective vent and return hole 31 in controls the pressure relief valve 29 designed as a seat valve depending on the temperature.
  • a closure 32 of the filler neck 26 of the plenum 17 includes in addition to the screwable, pot-shaped insert 27 a screwable with this insert 27 Cap 33 with a vent hole 34.
  • the pot-like Insert 27 furthermore serves as a stop for spring 28 of valve unit 25 Floor 35 one of the control of the hot fill level in the storage chamber 17 serving control opening 36 and arranged in the peripheral part 37 close to the cap Vent channels 38 on.
  • FIG. 4 shows the device 11 in operation of the internal combustion engine 2, the Valves 24 and 30 are to be considered closed.
  • the temperature-related coolant volume increase a clear, hysteresis-free Relationship between coolant temperature and spring force of the compression spring 20 or the pressure in the compensation chamber 19th
  • the arrangement according to the invention in device 11 advantageously offers Way a hot filling of the cooling system 1 without loss of System pressure and without risk through coolant ejection according to FIG. 5, that when inserted and against the screwed insert 27 elastically supported Valve unit 25 with an effectively closed thermal valve 30 only the Sealing cover 33 to the atmospheric supply chamber 17 is removed for a possible coolant refill via the control opening 36 in the bottom 35 of the insert 27.
  • the system pressure is maintained, the Missing coolant after opening the two vent and return valves 24 and 30 in the course of the next cooling process in internal combustion engine 2 and Cooler 4 air pockets can escape, as shown in Figure 6.
  • FIG. 6 finally shows the cooling system 1 cooling down the shutdown of the internal combustion engine 2, in particular a degassing process, where air and fuel gases through the open valves 24 and 30 and through the unpressurized supply chamber 17 through the ventilation channels 38 and the ventilation hole 34 escape into the atmosphere in the sealing cover 33 and then Coolant penetrates from the plenum 17 into the cooling system 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Safety Valves (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

Die Erfindung geht nach dem Oberbegriff des Patentanspruches 1 von der EP-A 0295445 aus.The invention is based on the preamble of claim 1 of EP-A 0295445.

Bei diesem bekannten Kühlsystem dient der von einer Vorlaufleitung durchsetzte Behälter der Luft- und Brenngasabscheidung aus dem Kühlmittel, wobei die abgeschiedenen Gase mittels eines Überdruckventiles in einer gegen einen Verschluß des Einfüllstutzens dieses Behälters elastisch abgestützt angeordneten Ventileinheit einem atmosphärisch beaufschlagten Ausgleichs-, Vorrats- und Luftsperrbehälter zugeführt sind. Dieser Ausgleichsbehälter enthält neben einer Kühlmittelvorlage ein Ausdehnungsvolumen, das von einem unter einem vorbestimmten Überdruck stehenden Gaspolster erfüllt ist.In this known cooling system, a flow line is used Container of air and fuel gas separation from the coolant, the separated Gases by means of a pressure relief valve in one against a closure the filler neck of this container elastically supported valve unit an atmospheric expansion, storage and air lock tank are fed. This expansion tank contains a coolant supply an expansion volume that is less than a predetermined positive pressure standing gas cushion is fulfilled.

Zu den im wesentlichen aus starren Wänden gebildeten Ausgleichsbehälter zum Ausgleich thermisch bedingter Volumenänderungen des Kühlmittels kommen als zusätzliche Ausgleichseinrichtungen elastische Verbindungsschläuche zwischen der Brennkraftmaschine und dem Kühler in Frage, wie dies zum Beispiel aus der US 3208438 an sich bekannt ist.To the expansion tank formed essentially from rigid walls Compensation for thermally induced changes in volume of the coolant come as additional compensation devices elastic connecting hoses between the internal combustion engine and the cooler in question, such as from the US 3208438 is known per se.

Ausgleichsbehälter mit zumindest bereichsweise elastisch nachgiebigen Einrichtungen sind aus der US 3238932 und der DD-PS 136280 bekannt. Expansion tank with at least partially elastically compliant devices are known from US 3238932 and DD-PS 136280.

Bei den vorbeschriebenen Systemen erfolgt der notwendige Druckaufbau im jeweiligen Kühlsystem durch Komprimieren eines Puffer- Luft-/ Gasvolumens, und zwar vorzugsweise im Ausgleichsbehälter. Nachteilig hierbei ist ein relativ großes Ausdehnungsvolumen, um die Volumenzunahme des Kühlmittels auch unter extremen Temperaturbedingungen, wie zum Beispiel Nachheizen bei heiß abgestellter Brennkraftmaschine, aufnehmen zu können, um einen eventuellen Kühlmittel-Auswurf bzw. Kühlmittel-Verlust zu verhindern. Da weiter der Druckaufbau wesentlich von der Volumenaufteilung im Ausgleichsbehälter zwischen Kühlmittel-Vorlage und Puffer- Luft-/ Gasvolumen bestimmt ist, ist auch unter Berücksichtigung von Leckage- und Verdampfungsverlusten ein Mindest-Füllstand im Ausgleichsbehälter erforderlich. Die Anforderung nach großem Puffer- Luft-/ Gasvolumen und ausreichender Mindest-Vorlage an Kühlmittel ergibt einen relativ großen Ausgleichsbehälter, der aufgrund seines Platzbedarfes im Motorraum schwierig zu plazieren ist und gegebenenfalls ungünstige Leitungsanordnungen bedingt.In the systems described above, the necessary pressure build-up takes place in the respective Cooling system by compressing a buffer air / gas volume preferably in the expansion tank. The disadvantage here is a relatively large one Expansion volume to measure the volume increase of the coolant even under extreme Temperature conditions, such as reheating when the heat is off Internal combustion engine to be able to record a possible coolant ejection or prevent coolant loss. Since the pressure build-up is essential of the volume distribution in the expansion tank between the coolant supply and buffer air / gas volume is also determined taking into account Leakage and evaporation losses a minimum level in the expansion tank required. The requirement for large buffer air / gas volume and sufficient Minimum coolant supply results in a relatively large expansion tank, which is difficult to place in the engine compartment due to its space requirements and possibly unfavorable line arrangements.

Der Erfindung liegt die Aufgabe zugrunde, daß gattungsgemäße Kühlsystem dahingehend zu verbessern, daß der im Kühlsystem zur Vermeidung vorzeitigen Siedens und zur Vermeidung einer Pumpen-Kavitation erforderliche Druck ohne ein vorgespanntes Puffer- Luft-/ Gasvolumen erzielt ist.The invention has for its object that generic cooling system in this regard to improve that in the cooling system to avoid premature boiling and to avoid pump cavitation required pressure without a preloaded buffer air / gas volume is achieved.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst. Der Vorteil der Erfindung ist in der Kombination einer mechanisch im Kühlmittel erzeugten Druckspannung mit einer Vorlauf-Systemdrucksteuerung zu sehen, wobei die Druckabsteuerung in eine atmosphärisch beaufschlagte und damit drucklose Kühlmittel-Vorlage erzielt ist. Dies ergibt eine vorteilhaft kleinbauende Befüll-, Entlüftungs- und Drucksteuer-Vorrichtung, die vorzugsweise im Kühlsystem-Vorlauf von der Brennkraftmaschine zum Kühler angeordnet ist.This object is achieved with patent claim 1. The advantage of the invention is in the combination of a mechanical stress generated in the coolant with to see a flow system pressure control, the pressure control in achieves an atmospheric and thus pressureless coolant supply is. This results in an advantageously small-sized filling, venting and pressure control device, which are preferably in the cooling system flow from the internal combustion engine is arranged to the cooler.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben. Die im Anspruch 2 beschriebene lösbare Anordnung der aus Überdruck- und Entlüftungs- und Rücklauf-Ventil gebildeten Ventileinheit im Ventilstutzen der Vorlaufleitung ermöglicht eine rasche Kaltbefüllung des gesamten Kühlsystems mit rascher, zuverlässiger Entlüftung. Die weiter im Anspruch 2 beschriebene Anordnung der Ventileinheit im Ventilstutzen mittels elastischer Abstützung gegen einen im Einfüllstutzen lösbar angeordneten Einsatz ergibt in Verbindung mit der drucklosen Kühlmittel-Vorlage bei betriebswarmen Kühlsystem den Vorteil, daß ein Öffnen der Vorlagekammer ohne Druckverlust im Kühlsystem und ohne Risiko für den Kontrollierenden durch Kühlmittel-Auswurf eine Überprüfung der Kühlmittel-Vorlage und gegebenenfalls eine Warmbefüllung möglich ist.Advantageous embodiments of the invention are described in the subclaims. The releasable arrangement described in claim 2 of the overpressure and Venting and return valve valve unit formed in the valve stub of the flow line enables rapid cold filling of the entire cooling system quick, reliable ventilation. The arrangement further described in claim 2 the valve unit in the valve socket by means of elastic support against one In the filler neck detachably arranged insert results in connection with the unpressurized Coolant submission with warm cooling system the advantage that an opening the supply chamber without pressure loss in the cooling system and without risk for the Controlling by coolant ejection a check of the coolant template and if necessary a hot filling is possible.

Ein nach einem Teilmerkmal des Anspruches 1 die Ausgleichskammer mit der Vorlagekammer verbindendes Entlüftungs- und Rücklaufventil und ein gemäß einem Teilmerkmal des Anspruches 3 die Vorlaufleitung des Kühlsystems mit der Vorlagekammer verbindendes Entlüftungs- und Rücklaufventil sind jeweils als ein Thermoventil gestaltet, die ab einer vorbestimmten Betriebstemperatur Gas- und Kühlmittelaustausch unterbinden und somit zu einem gefahrlosen Öffnen der Kühlmittel-Vorlagekammer vorteilhaft beitragen.According to a partial feature of claim 1, the compensation chamber with the Vent chamber and return valve connecting and a according to one Partial feature of claim 3, the flow line of the cooling system with the Vent and return valve connecting the feed chamber are each as one Thermal valve designed, the gas and from a predetermined operating temperature Prevent coolant exchange and thus safe opening of the Coolant supply chamber contribute advantageously.

Der weiter oben bereits erwähnte, im Einfüllstutzen lösbar angeordnete Einsatz als Wiederlager einer die Ventileinheit bezüglich des Überdruckventils in Schließstellung haltenden Feder ist gemäß Anspruch 4 vorzugsweise topfartig gestaltet mit einer im Boden angeordneten Kontrollöffnung zur Kontrolle des Warmfüllstandes. Schließlich beschreibt Anspruch 5 die verlagerbare Begrenzung der Ausgleichskammer als einen mit dieser über einen Rollbalg kühlmitteldicht angeordneten Verdrängerkolben, der von einer vorgespannten Druckfeder beaufschlagt ist. Die Vorspannung der Druckfeder kann so gewählt sein, daß bis zum Erreichen des durch thermisch bedingte Volumenänderung des Kühlmittels im Kühlsystem erzeugten Druckes vorbestimmte Höhe eine entsprechend geringe Verlagerung des Verdrängerkolbens gegeben ist.The insert already mentioned above, detachably arranged in the filler neck as Reinstall the valve unit with respect to the pressure relief valve in the closed position holding spring is preferably designed in a pot-like manner with a control opening in the floor for checking the hot fill level. Finally, claim 5 describes the displaceable limitation of the compensation chamber as a displacer piston arranged with this in a coolant-tight manner via a rolling bellows, which is acted upon by a prestressed compression spring. The preload the compression spring can be chosen so that until the through generated thermal change in volume of the coolant in the cooling system Pressure predetermined height a correspondingly small displacement of the displacer given is.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben. Es zeigt

Figur 1
ein Kühlsystem einer flüssigkeitsgekühlten Brennkraftmaschine,
Figur 2
eine erfindungsgemäße Befüll-, Entlüftungs- und Drucksteuer-Vorrichtung,
Figur 3
die Vorrichtung gemäß Figur 3 für eine Kaltbefüllung vorbereitet,
Figur 4
die Vorrichtung gemäß Figur 3 bei Motorbetrieb,
Figur 5
die Vorrichtung gemäß Figur 3 bei Warmbefüllung, z.B. bei laufendem Motor, und schließlich
Figur 6
die Vorrichtung gemäß Figur 3 beim Abkühl-Vorgang einer abgestellten Brennkraftmaschine.
The invention is described with reference to an embodiment shown in the drawing. It shows
Figure 1
a cooling system of a liquid-cooled internal combustion engine,
Figure 2
a filling, venting and pressure control device according to the invention,
Figure 3
the device according to FIG. 3 is prepared for cold filling,
Figure 4
3 the device according to FIG. 3 during engine operation,
Figure 5
the device according to Figure 3 with hot filling, for example with the engine running, and finally
Figure 6
the device of Figure 3 during the cooling process of a parked internal combustion engine.

Ein Kühlsystem 1 für eine flüssigkeitsgekühlte Brennkraftmaschine 2 umfaßt einen Vorlauf 3 zum Kühler 4 und von diesem zur Brennkraftmaschine 2 zurück einen Rücklauf 5, der an ein Gehäuse 6 eines Thermostaten 7 angeschlossen ist. Aus dem Gehäuse 6 mit den Kurzschluß 8 betriebsbedingt verschließendem Thermostaten 7 fließt das Kühlmittel über eine Saugleitung 9 einer Pumpe 10 zu, die das Kühlmittel in die Brennkraftmaschine 2 fördert.A cooling system 1 for a liquid-cooled internal combustion engine 2 comprises one Flow 3 to the radiator 4 and from this back to the internal combustion engine 2 Return 5, which is connected to a housing 6 of a thermostat 7. Out the housing 6 with the short circuit 8 closing due to operation Thermostats 7 the coolant flows through a suction line 9 to a pump 10, which conveys the coolant into the internal combustion engine 2.

Im Vorlauf 3 ist zwischen der Brennkraftmaschine 2 und dem Kühler 4 eine erfindungsgemäße Befüll-, Entlüftungs- und Drucksteuer-Vorrichtung 11 angeordnet.In the lead 3 between the internal combustion engine 2 and the cooler 4 is an inventive Filling, venting and pressure control device 11 arranged.

Gemäß den Figuren 2 mit 6 umfaßt die Vorrichtung 11 einen Behälter 12, der von einer mit dem Vorlauf 3 verbundenen Vorlaufleitung 13 durchsetzt ist. Die Vorlaufleitung 13 weist einen fest angeordneten Ventilstutzen 14 auf, der eine Trennwand 15 des Behälters 12 dichtdurchsetzend angeordnet ist und mit seiner Ventilöffnung 16 in eine Kammer 17 für eine atmosphärisch beaufschlagte Kühlmittel-Vorlage 18 mündet.According to Figures 2 to 6, the device 11 comprises a container 12, which of a flow line 13 connected to the flow line 3 is penetrated. The lead pipe 13 has a fixed valve socket 14, which has a partition 15 of the container 12 is arranged sealingly and with its valve opening 16 into a chamber 17 for an atmospheric coolant supply 18 flows.

Unterhalb der Trennwand 15 weist der Behälter 12 eine weitere, geodätisch tiefer angeordnete Kammer 19 auf, die mittels eines gegen den elastischen Widerstand einer Druckfeder 20 verlagerbaren Verdrängerkolbens 21 einem Kühlmittelvolumen-Ausgleich dient. Mittels eines Rollbalges 22 ist der Verdrängerkolben 21 kühlmitteldicht der Ausgleichskammer 19 zugeordnet.Below the partition 15, the container 12 has a further, geodetically deeper arranged chamber 19, which by means of an elastic resistance a compression spring 20 displaceable displacer 21 a coolant volume compensation serves. The displacement piston 21 is by means of a rolling bellows 22 assigned coolant-tight to the compensation chamber 19.

Diese Ausgleichskammer 19 steht über einen Anschlußstutzen 23 und eine Leitung 23' mit der in Figur 1 dargestellten Pumpen-Saugleitung 9 in kühlmittelführender Verbindung. Mit der Kühlmittel-Vorlagekammer 17 ist die Ausgleichskammer 19 über ein temperaturgesteuertes Entlüftungs- und Rücklaufventil 24 verbunden. Derartige Thermoventile sind bekanntlich zum Beispiel mit einem Bimetallelement ausgerüstet, das ein Kugel-Ventil in Schließposition bringt und hält nach Überschreiten einer vorbestimmten Temperatur.This compensation chamber 19 is connected via a connecting piece 23 and a line 23 'with the pump suction line 9 shown in Figure 1 in coolant-carrying Connection. The compensation chamber 19 is provided with the coolant supply chamber 17 connected via a temperature-controlled vent and return valve 24. Such thermal valves are known to be, for example, with a bimetal element equipped, which brings a ball valve into the closed position and stops after being exceeded a predetermined temperature.

In dem Ventilstutzen 14 der Vorlaufleitung 13 ist zur Steuerung der Ventilöffnung 16 eine Ventileinheit 25 gegen den Widerstand einer gegen einen in einem Einfüllstutzen 26 der Vorlagekammer 17 eingeschraubt angeordneten Einsatz 27 abgestützten Feder 28 verlagerbar angeordnet. Die Ventileinheit 25 selbst dient zur Systemdrucksteuerung des Kühlsystems 1 als in die atmosphärisch belüftete Kühlmittel-Vorlagekammer 17 öffnendes Überdruckventil 29.In the valve stub 14 of the flow line 13 is for controlling the valve opening 16 a valve unit 25 against the resistance of one against one in a filler neck 26 of the plenum 17 screwed insert 27 supported Spring 28 arranged displaceably. The valve unit 25 itself serves System pressure control of the cooling system 1 as in the atmospheric ventilated Coolant supply chamber 17 opening pressure relief valve 29.

Die Ventileinheit 25 umfaßt ferner ein Entlüftungs- und Rücklaufventil 30, das als Thermoventil vorbeschriebener Ausgestaltung eine zwischen der Vorlagekammer 17 und der Vorlaufleitung 13 wirksame Entlüftungs- und Rücklaufbohrung 31 in dem als Sitzventil gestalteten Überdruckventil 29 temperaturabhängig steuert.The valve unit 25 further includes a vent and return valve 30, which as Thermo valve of the above-described configuration between the plenum 17 and the flow line 13 effective vent and return hole 31 in controls the pressure relief valve 29 designed as a seat valve depending on the temperature.

Ein Verschluß 32 des Einfüllstutzens 26 der Vorlagekammer 17 umfaßt neben dem einschraubbaren, topfartig gestalteten Einsatz 27 einen mit diesem Einsatz 27 verschraubbaren Verschlußdeckel 33 mit einer Entlüftungsbohrung 34. Der topfartige Einsatz 27 weist ferner in dem als Anschlag der Feder 28 der Ventileinheit 25 dienenden Boden 35 einer der Kontrolle des Warmfüllstandes in der Vorlagekammer 17 dienende Kontrollöffnung 36 sowie im Umfangsteil 37 verschlußdeckelnah angeordnete Entlüftungskanäle 38 auf.A closure 32 of the filler neck 26 of the plenum 17 includes in addition to the screwable, pot-shaped insert 27 a screwable with this insert 27 Cap 33 with a vent hole 34. The pot-like Insert 27 furthermore serves as a stop for spring 28 of valve unit 25 Floor 35 one of the control of the hot fill level in the storage chamber 17 serving control opening 36 and arranged in the peripheral part 37 close to the cap Vent channels 38 on.

Mit der vorbeschriebenen, erfindungsgemäßen Anordnung kann mit der Entfernung des Verschlußdeckels 33, des Einsatzes 27 und der Ventileinheit 25 aus dem Ventilstutzen 14 über diesen eine Kaltbefüllung des Kühlsystems 1 der Brennkraftmaschine 2 in zügigem Ablauf erfolgen. Bei der in Figur 3 dargestellten Kaltbefüllung besteht gegenüber herkömmlichen Systemen eine Funktionsverbesserung, da das Kühlmittel gleichzeitig in die Brennkraftmaschine 2 und in den Kühler 4 gelangt und die im Brennkraftmaschinen-Kühlmantel befindliche Luft während des Befüllvorganges über die offene Vorlagekammer 17 einerseits und durch das geöffnete Ventil 24 andererseits entweichen kann. Eine bekanntlich nur durch Unterdruck erzielbare schnelle und vollständige Befüllung ist mit dem dargestellten System ohne Zusatzaufwand möglich. With the above-described arrangement according to the invention can with the distance of the closure cover 33, the insert 27 and the valve unit 25 from the Valve connector 14 via this a cold filling of the cooling system 1 of the internal combustion engine 2 take place quickly. In the cold filling shown in Figure 3 there is a functional improvement compared to conventional systems, since the coolant enters the internal combustion engine 2 and the cooler 4 at the same time and the air in the engine cooling jacket during the Filling process on the one hand and through the open chamber 17 Valve 24, on the other hand, can escape. As is well known, only by negative pressure Achievable fast and complete filling is shown with the System possible without additional effort.

Figur 4 zeigt die Vorrichtung 11 im Betrieb der Brennkraftmaschine 2, wobei die Ventile 24 und 30 geschlossen zu denken sind. Hierbei besteht entsprechend der temperaturbedingten Kühlmittel-Volumenzunahme ein eindeutiger, hysterisefreier Zusammenhang zwischen Kühlmitteltemperatur und Federkraft der Druckfeder 20 bzw. dem Druck in der Ausgleichskammer 19.Figure 4 shows the device 11 in operation of the internal combustion engine 2, the Valves 24 and 30 are to be considered closed. Here there is the temperature-related coolant volume increase a clear, hysteresis-free Relationship between coolant temperature and spring force of the compression spring 20 or the pressure in the compensation chamber 19th

Weiter bietet die erfindungsgemäße Anordnung in der Vorrichtung 11 in vorteilhafter Weise eine Warmbefüllung des Kühlsystems 1 ohne Verlust des Systemdruckes und ohne Risiko durch Kühlmittel-Auswurf gemäß Figur 5 dadurch, daß bei eingesetzter und gegen den eingeschraubten Einsatz 27 elastisch abgestützter Ventileinheit 25 mit wirksam verschlossenem Thermoventil 30 lediglich der Verschlußdeckel 33 zu der atmosphärisch beaufschlagten Vorlagekammer 17 zu entfernen ist für eine eventuelle Kühlmittel-Nachfüllung über die Kontrollöffnung 36 im Boden 35 des Einsatzes 27. Hierbei bleibt der Systemdruck erhalten, wobei das fehlende Kühlmittel nach dem Öffnen der beiden Entlüftungs- und Rücklaufventile 24 und 30 im Verlauf des nächsten Abkühlvorganges in Brennkraftmaschine 2 und Kühler 4 Lufteinschlüsse entweichen können, wie dies in Bild 6 dargestellt ist.Furthermore, the arrangement according to the invention in device 11 advantageously offers Way a hot filling of the cooling system 1 without loss of System pressure and without risk through coolant ejection according to FIG. 5, that when inserted and against the screwed insert 27 elastically supported Valve unit 25 with an effectively closed thermal valve 30 only the Sealing cover 33 to the atmospheric supply chamber 17 is removed for a possible coolant refill via the control opening 36 in the bottom 35 of the insert 27. The system pressure is maintained, the Missing coolant after opening the two vent and return valves 24 and 30 in the course of the next cooling process in internal combustion engine 2 and Cooler 4 air pockets can escape, as shown in Figure 6.

Bild 6 zeigt schließlich während eines Abkühlvorganges des Kühlsystems 1 nach dem Abstellen der Brennkraftmaschine 2 einen insbesondere Entgasungsvorgang, wobei Luft- und Brenngase durch die geöffneten Ventile 24 und 30 und über die drucklose Vorlagekammer 17 durch die Entlüftungskanäle 38 und die Entlüftungsbohrung 34 im Verschlußdeckel 33 in die Atmosphäre entweichen und anschließend Kühlmittel aus der Vorlagekammer 17 in das Kühlsystem 1 vordringt.Figure 6 finally shows the cooling system 1 cooling down the shutdown of the internal combustion engine 2, in particular a degassing process, where air and fuel gases through the open valves 24 and 30 and through the unpressurized supply chamber 17 through the ventilation channels 38 and the ventilation hole 34 escape into the atmosphere in the sealing cover 33 and then Coolant penetrates from the plenum 17 into the cooling system 1.

Die erfindungsgemäße Befüll-, Entlüftungs- und Drucksteuer-Vorrichtung 11 weist zusammengefaßt folgende Vorteile auf:

  • Druckbegrenzung im Bereich des Eintrittes des Vorlaufes 3 in den Kühler 4, wobei austretendes Kühlmittel nicht verloren geht, sondern in der Vorlagekammer 17 vorgelagert und beim nächsten Abkühlvorgang wieder dem Kühlsystem 1 zugeführt wird;
  • Trennung von Luft/Gas und Kühlmittel während der Druckaufbauphase beim Warmlauf;
  • Systembelüftung nach jedem Abkühlvorgang. Damit wird die insbesondere bei Dieselmotoren durch Brenngas-Übertritt ins Kühlmittel hervorgerufene Aufpump-Neigung des Kühlsystems 1 unterdrückt;
  • Abhängigkeit des Druckaufbaues - abgesehen von systembedingten Größen wie Kühlmittel-Gesamtinhalt, Wasser/Glykol-Mischungsverhältnis und Schlauch-Elastizität - ausschließlich von einer Einflußgröße, nämlich der Steifigkeit der Druckfeder 20.
    • The filling, venting and pressure control device 11 according to the invention has the following advantages in summary:
  • Pressure limitation in the area of the inlet 3 into the cooler 4, whereby emerging coolant is not lost, but is stored upstream in the supply chamber 17 and is returned to the cooling system 1 during the next cooling process;
  • Separation of air / gas and coolant during the pressure build-up phase during warm-up;
  • System ventilation after each cooling process. This suppresses the tendency of the cooling system 1 to inflate, particularly in diesel engines due to fuel gas transfer into the coolant;
  • Dependency of the pressure build-up - apart from system-related variables such as total coolant content, water / glycol mixture ratio and hose elasticity - depends exclusively on one influencing variable, namely the rigidity of the compression spring 20.

    • Claims (6)

    1. A cooling system for a liquid-cooled internal combustion engine,
      comprising an elastically resilient device for compensating thermal changes in volume up to a predetermined system pressure of the coolant, which is circulated by a pump (10), and
      a device (11) for controlling the system pressure in a flow line (13), wherein
      the flow line (13), which is disposed so as to extend through a container (12), has a valve nozzle (14) disposed substantially in line with a filling socket (26) for receiving a valve unit (25) controlling flow in the opposite direction and
      disposed so as to be movable in the valve nozzle (14), which is resiliently braced against a plug (32) on the filling socket (26),
      characterised in that
      the valve nozzle (14) disposed on the flow line (13) is disposed so as to extend through a partition (15) dividing the container (12) into two chambers (17, 19) and has a valve opening (16) receiving a valve unit (25) for excess-pressure control, venting and coolant supply, the opening (16) leading into a chamber (17) for an atmospherically actuated coolant receiver (18), which
      is also connected to the other, geodetically lower chamber (19) via a temperature-controlled venting and bypass valve (24) additionally disposed in the partition (15), the chamber
      the volume of coolant of the compensating chamber (19) by means of a limit stop (21) movable by the system pressure against an elastic resistance, wherein
      the compensating chamber (19) and the coolant-receiver chamber (17), which is connectable thereto via the venting and bypass valve (24), are connected by a nozzle (23) to a pump suction line (9) on the cooling system (1).
    2. A cooling system according to claim 1, characterised in that
      the valve nozzle (14) of the flow line (13) is formed with a removable valve unit (25) which is removable for the purpose of cold-filling the cooling system (1), and which
      during hot-filling of the cooling system (1) is disposed in the valve nozzle (14) and resiliently braced against a stop (base 35) of an insert (27) releasably disposed in the filling nozzle (26), the stop being provided at the hot filling level in the receiver chamber (17).
    3. A cooling system according to claims 1 and 2, characterised in that
      the valve unit (25) comprises a venting and bypass valve (30) structurally combined with an excess-pressure valve (29), wherein
      the venting and bypass valve (30), which is in the form of a temperature valve, controls a venting and return bore (31) operative between the receiver chamber (17) and the flow line (13) in the excess-pressure valve (29), which is in the form of a seat valve, the control being temperature-dependent.
    4. A cooling system according to claims 1 to 3, characterised in that
      the plug (32) of the filling nozzle (26) of the receiver chamber (17) has a pot-shaped insert (27) screwable to the filling socket (26) and
      comprises a closure cover (33) having a venting bore (34) and cooperating with the insert (27), wherein
      the insert (27) has an opening (36) for monitoring the hot filling level and venting ducts (38) disposed near the closing cover in the peripheral part (37) in the base (35), which serves as a stop for the spring (28) of the valve unit (25).
    5. A duct system according to claims 1 to 4, characterised in that
      the compensating chamber (19) comprises a movable limit stop in the form of a displacement piston (21) disposed in coolant-tight manner by means of a roll bellows (22) and
      acted upon by a prestressed pressure spring (20) braced against the container (12).
    6. A cooling system according to claims 1 to 5, characterised in that the filling, venting and pressure-control device (11) and the atmospherically actuated coolant receiver (18) are disposed over the flow line (13) directly in the flow pipe (3) from the engine (2) to the radiator (4).
    EP97914252A 1996-03-21 1997-03-15 Cooling system for a liquid-cooled internal combustion engine Expired - Lifetime EP0888494B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19611095A DE19611095A1 (en) 1996-03-21 1996-03-21 Cooling system for a liquid-cooled internal combustion engine
    DE19611095 1996-03-21
    PCT/EP1997/001318 WO1997035101A1 (en) 1996-03-21 1997-03-15 Cooling system for a liquid-cooled internal combustion engine

    Publications (2)

    Publication Number Publication Date
    EP0888494A1 EP0888494A1 (en) 1999-01-07
    EP0888494B1 true EP0888494B1 (en) 2000-06-28

    Family

    ID=7788940

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97914252A Expired - Lifetime EP0888494B1 (en) 1996-03-21 1997-03-15 Cooling system for a liquid-cooled internal combustion engine

    Country Status (6)

    Country Link
    US (1) US6125800A (en)
    EP (1) EP0888494B1 (en)
    JP (1) JP2000509454A (en)
    DE (2) DE19611095A1 (en)
    ES (1) ES2148949T3 (en)
    WO (1) WO1997035101A1 (en)

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    FI116803B (en) * 2001-04-27 2006-02-28 Crane John Safematic Oy Device in a mechanical seal
    WO2006097162A1 (en) * 2005-03-18 2006-09-21 Behr Gmbh & Co .Kg Heat exchanger with ventilation
    DE102008019227B4 (en) 2008-04-17 2010-05-12 Audi Ag Method and apparatus for compensating the thermal expansion of volume in a coolant circuit of a liquid-cooled internal combustion engine
    DE102010018089B3 (en) * 2010-04-24 2011-07-14 Audi Ag, 85057 Valve arrangement for ventilation of refrigerant circuit of internal combustion engine, has valve by which primary and secondary ventilation lines are combined to joint
    DE102010033715A1 (en) * 2010-08-07 2012-02-09 Audi Ag Expansion tank for a coolant circuit
    DE102013226420A1 (en) 2013-12-18 2015-06-18 Volkswagen Aktiengesellschaft Bleed valve and cooling system for an internal combustion engine
    CN204187069U (en) * 2014-10-23 2015-03-04 讯凯国际股份有限公司 Water supplement structure, the pump with this water supplement structure and liquid-cooling heat radiator
    RU2640661C1 (en) * 2017-02-14 2018-01-11 Марк Евгеньевич Дискин Liquid cooling system
    JP2022054600A (en) * 2020-09-28 2022-04-07 いすゞ自動車株式会社 Cap of on-vehicle tank

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    Also Published As

    Publication number Publication date
    EP0888494A1 (en) 1999-01-07
    ES2148949T3 (en) 2000-10-16
    DE59701936D1 (en) 2000-08-03
    JP2000509454A (en) 2000-07-25
    DE19611095A1 (en) 1997-09-25
    US6125800A (en) 2000-10-03
    WO1997035101A1 (en) 1997-09-25

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