WO2022048842A1 - Réservoir de compensation pour un système d'agent de refroidissement, et véhicule automobile - Google Patents

Réservoir de compensation pour un système d'agent de refroidissement, et véhicule automobile Download PDF

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Publication number
WO2022048842A1
WO2022048842A1 PCT/EP2021/071608 EP2021071608W WO2022048842A1 WO 2022048842 A1 WO2022048842 A1 WO 2022048842A1 EP 2021071608 W EP2021071608 W EP 2021071608W WO 2022048842 A1 WO2022048842 A1 WO 2022048842A1
Authority
WO
WIPO (PCT)
Prior art keywords
expansion tank
passage opening
coolant
chambers
opening
Prior art date
Application number
PCT/EP2021/071608
Other languages
German (de)
English (en)
Inventor
Volker Raab
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
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 Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Publication of WO2022048842A1 publication Critical patent/WO2022048842A1/fr

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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
    • 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
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level

Definitions

  • the present invention relates to an expansion tank for a coolant system, in particular of a motor vehicle.
  • the invention further relates to a corresponding motor vehicle equipped with such an expansion tank.
  • liquid-based cooling In the field of vehicle technology as well as in other technical fields, the cooling requirements of various devices or units can often only be met by liquid-based cooling.
  • liquid-based cooling systems often have expansion tanks for a cooling medium or coolant circulating in the cooling system.
  • expansion tanks serve, for example, as a place for venting the respective cooling system and for topping up coolant and can also absorb volume changes in the coolant caused by temperature changes.
  • a part of the expansion tank integrated into a cooling system is intended to be empty or filled with air or gas, as a result of which damage to the coolant system due to an excessive increase in pressure due to the incompressibility of typical coolants can be avoided.
  • an expansion tank for cooling circuits with different temperature levels and pressure addition is known from DE 102018 102 235 A1.
  • the expansion tank described there is divided into separate chambers by partitions.
  • the expansion tank comprises at least two coolant chambers coupled on the coolant side and on the air side and a series connection of at least two air chambers connected thereto for rapid pressure build-up by means of pressure addition.
  • the coolant chambers can communicate via passage openings in the partitions. A level of the coolant can therefore equalize across the plurality of chambers via these passage openings.
  • the expansion tank described there has a coolant chamber and an expansion chamber separated from this by a partition.
  • the expansion chamber is arranged below the coolant chamber, with an upper area of the coolant chamber being connected to a lower area of the expansion chamber by an overflow line.
  • the expansion tank should have a base body which is closed in a fluid-tight manner by at least two cover elements and is designed in the form of a section of an extruded profile.
  • the coolant chamber and/or the expansion chamber can be penetrated by baffles in order to dampen coolant movement within the coolant chamber or the expansion chamber and to increase the rigidity of the expansion tank. Even there, however, no solution is ultimately offered for the problems addressed.
  • the object of the present invention is to reduce the risk of air being sucked in from an expansion tank of a coolant system in a particularly space-saving manner.
  • An expansion tank according to the invention for a coolant system in particular a motor vehicle, has a housing whose interior volume is divided into a plurality of chambers by at least one baffle running therein, i.e. arranged therein, for damping a movement of a coolant or cooling medium in the expansion tank.
  • the at least one baffle has at least one lower passage opening through which fluid can flow and at least one upper passage opening through which fluid or air can flow.
  • the lower passage opening is arranged below an intended, that is to say predetermined, minimum fill level of a coolant in the expansion tank.
  • the upper passage opening is arranged above an intended, ie predetermined, maximum fill level of the coolant in the equalizing tank in relation to the direction of gravity in the intended installation position of the equalizing tank.
  • the chambers are coupled to one another through the passage openings.
  • the chambers can therefore communicate with one another via the through-openings, so that the level of the coolant in the expansion tank can be equalized through the through-openings, for example when the expansion tank or the motor vehicle equipped with it is accelerated or the expansion tank is inclined relative to a local direction of gravity.
  • the upper passage opening has a greater flow resistance than the lower passage opening for a given medium.
  • the upper passage opening can oppose a greater resistance than the lower passage opening to a substance flowing or flowing through it at a specific pressure.
  • a lower volume flow of the specified medium would flow through the upper Orifice flow than through the lower orifice.
  • the upper passage opening and the lower passage opening can be configured differently from one another. Various options for this are explained in more detail below.
  • the baffles can reduce movements of the coolant within the expansion tank.
  • a sufficient quantity of coolant can always be present or made available in the lower region of the expansion tank through the lower passage opening, which completely breaks through or penetrates through the baffle perpendicular to its main plane of extension, for example in an outlet opening arranged there or a coolant line connected there.
  • the lower passage opening can be completely covered or filled with coolant permanently or at least temporarily. In such a situation, air above a fill level or level of the coolant in the expansion tank can flow through the upper passage opening from one of the chambers into the or another chamber, which allows the level of the coolant to be equalized within the expansion tank, i.e. across all chambers.
  • the time required for this level equalization of the coolant within the expansion tank is lengthened.
  • the upper passage opening acts as damping for level compensation, i.e. as an air throttle.
  • This damping or throttling effect of the upper passage opening allows the movement of the coolant within the expansion tank to be slowed down without being completely prevented. This can prevent, for example, a lower area, for example an outlet or connection opening in a base of the expansion tank, from falling dry as a result of an oscillatory movement, i.e.
  • the coolant sloshing back and forth in the expansion tank when the expansion tank is accelerated or tilted.
  • the present invention can be used particularly advantageously for compensating tanks of the most varied, in particular also non-optimal, basic geometries. Since the expansion tank can also be made smaller overall than a conventional expansion tank thanks to the present invention, without thereby accepting an increased risk for air intake, the expansion tank according to the invention can also meet demanding packaging requirements or a limited or asymmetrical abdominal space for arrangement of the expansion tank can be used.
  • the upper and lower passage openings are matched to one another in such a way that the upper passage opening opposes at least essentially the same flow resistance to air flowing through it as the lower passage opening opposes a coolant flowing through it.
  • the flow resistances of the lower and upper passage openings are different for a single medium.
  • the flow resistance of the upper passage opening for air and the lower passage opening for a given coolant can be at least essentially the same. This is achieved here by a corresponding design of the passage openings, whereby the differences in the flow behavior between air and coolant are taken into account or compensated for.
  • water, glycol, a salt solution, an oil and/or the like can be specified or used as the coolant.
  • the upper passage opening in the surge wall occupies a smaller area than the lower passage opening.
  • the upper passage opening is therefore smaller than the lower passage opening, in particular or at least with regard to its area or extent in a main plane of extension of the baffle.
  • the upper and lower passage openings can have the same shape or be shaped differently. Identical shapes of the upper and lower passage openings can then enable a particularly simple determination of their area or size ratio and can also be particularly easy to manufacture. by different Shapes of the upper and lower passage openings, on the other hand, can enable their different sizes to be independent of or adapted to a complex or irregular shape of the baffle or the expansion tank.
  • the smaller configuration of the upper passage opening represents a possibility that can be implemented in a particularly simple manner for setting the greater flow resistance of the upper passage opening in comparison to the lower passage opening.
  • the lower passage opening is designed as a free opening through the respective baffle, with a partially permeable, in particular partially air-permeable, membrane being arranged in the upper passage opening.
  • the upper passage opening can therefore be filled or covered by the partially permeable membrane. Due to its partial permeability, such a partially permeable membrane can furthermore enable a pressure or level equalization between the chambers.
  • the partially permeable membrane represents a possibility of increasing the flow resistance of the upper passage opening in comparison to the lower passage opening or a passage opening designed as a free passage.
  • a design or configuration of a passage opening as a free opening means here that the respective passage opening effectively represents a hole in the baffle that is not covered or filled by another material of the expansion tank.
  • This design of the lower passage opening can ensure that a coolant flow between the chambers is not impeded or impaired and thus sufficient coolant can always flow out of the chambers, for example to an outlet opening or a connection of a coolant line of the coolant system.
  • the options for realizing the greater flow resistance between the upper passage opening compared to the lower passage opening can also be combined with one another.
  • the interior volume of the housing is divided into more than two chambers.
  • This can be realized, for example, by means of several baffles that penetrate completely or partially through the housing or its interior volume.
  • Several baffles can be arranged parallel or perpendicular to one another or at a different angle to one another. All pairs of mutually adjacent, i.e. only through exactly one of the baffles chambers that are separate or delimited from one another are coupled to one another by a respective upper passage opening and a respective lower passage opening.
  • each baffle or each section of one of the baffles which forms a common wall or delimitation of two chambers adjoining the respective baffle or section has both an upper passage opening and a lower passage opening.
  • the at least one baffle has a plurality of lower passage openings and/or a plurality of upper passage openings, in particular in the region of one of the chambers.
  • the individual flow resistance of each individual upper through-opening arranged in the respective area is greater than the individual flow resistance of each individual lower through-flow opening arranged in this area.
  • the combined or combined flow resistance of all upper passage openings in the respective area is greater than the combined or combined flow resistance of all lower passage openings in the respective area. This applies in each case to a specified medium and/or a specified pressure.
  • the intended described functioning of the expansion tank that is to say the possibility of coolant level equalization between the chambers, can be ensured in a particularly reliable manner over the long term.
  • the level compensation can also continue to take place if one of the passage openings is clogged, since two adjacent chambers are directly connected or coupled to one another via several upper passage openings and/or several lower passage openings, i.e. can communicate.
  • the expansion tank is designed as a pressure tank.
  • the expansion tank can be airtight or pressure-tight, at least with the exception of an outlet or outflow or connection for the coolant system or a coolant line, so that it can maintain a pressure difference between its internal volume and its external environment.
  • the coolant can be under an increased pressure compared to the external environment and can be kept in a particularly simple manner.
  • the flow resistance of the through-openings or the ratio of the flow resistance of the upper and lower through-openings for a certain predetermined internal pressure of the coolant system or the expansion tank can then be set, for example by appropriately adapted design of the through-openings, in order to achieve the desired throttling effect of the upper through-openings particularly precisely and reliable to reach.
  • the expansion tank has a connection opening for connection to a coolant line.
  • this connection opening is arranged below the lower passage opening.
  • coolant can, for example, be sucked out of the expansion tank by a coolant pump through the connection opening.
  • the arrangement of the connection opening below the lower passage opening can help to limit coolant loss from the expansion tank, for example in the event of a leak or damage to the expansion tank, and ensure that sufficient coolant can reach the connection opening during regular operation.
  • connection opening can be surrounded all around by areas of the baffles remaining below the respective lower passage opening, so that at least a minimum supply of coolant can be kept in the area of the connection opening even if the expansion tank is damaged in an adjacent chamber.
  • connection opening is arranged in a central area of a base of the expansion tank.
  • connection opening can be arranged in or on a central chamber of the expansion tank, which can be surrounded all around by further chambers, at least in the main directions of extension of the base.
  • Another aspect of the present invention is a motor vehicle having a coolant system.
  • This coolant system for its part, comprises a coolant line and an expansion tank according to the invention which is connected to it in a fluid-conducting manner.
  • the coolant system of the motor vehicle according to the invention can be designed, for example, to cool a unit or a drive component and/or one or more other devices of the motor vehicle.
  • the motor vehicle according to the invention can in particular be the vehicle mentioned in connection with the expansion tank according to the invention and accordingly have some or all of the properties and/or features mentioned in this connection.
  • 1 shows a schematic cross-sectional view of an expansion tank for a coolant system in a first direction
  • 2 shows a schematic cross-sectional view of the expansion tank in a second direction.
  • FIG. 1 shows a first schematic cross-sectional view of an expansion tank 10, for example for a coolant system of a motor vehicle. Accelerations and decelerations in the range of 1 g can occur regularly, especially in the electric motor vehicles that are becoming more and more widespread nowadays. This can lead to liquids in the motor vehicle or its systems, such as the coolant system, shifting relative to the motor vehicle against a respective direction of acceleration due to their inertia and mobility. This can be problematic for a number of reasons.
  • the expansion tank 10 shown here has an outer housing 12 .
  • This housing 12 can be made, for example, from a plurality of parts connected to one another, for example an upper shell and a lower shell glued or welded thereto, in particular from a plastic material.
  • the compensating tank 10 has a filling point 14 on an upper side with respect to a direction of gravity in the intended installation position of the compensating tank 10 for its filling.
  • the filling point 14 can be, for example, an opening in the housing 12 that can be tightly closed by a cover or closure.
  • the expansion tank 10 has, in particular on an underside opposite the filling point 14, a line connection 16 for connecting to a coolant system, ie for connecting a coolant line.
  • the line connection 16 can therefore represent an inlet and outlet.
  • a valve for example, can also be arranged on the line connection 16 .
  • An inner volume of the expansion tank 10 or of the housing 12 is here penetrated by a plurality of baffles 18 , by which the inner volume of the housing 12 is divided into a plurality of chambers 20 .
  • the expansion tank 10 can have nine such chambers 20, of which the three here in the viewing direction middle are recognizable.
  • three further chambers 20 can be arranged in front of and behind the plane. Accordingly, the filling point 14 and the line connection 16 can be arranged here on a central chamber 20 .
  • the expansion tank 10 is partially filled with a liquid coolant 22 .
  • This coolant 22 can correspondingly expand into an empty or air-filled remaining part of the chambers 20 as the temperature increases.
  • the coolant 22 within the expansion tank 10 can shift relative to the latter during the accelerations mentioned, as well as when the expansion tank 10 tilts. As a result, a filling level or a coverage with the coolant 22 in the area of the line connection 16 can change, in particular ultimately decrease.
  • a coolant pump (not shown here) can bring its needs to bear, ie suck coolant 22 out of the expansion tank 10 . This creates a risk of air intake, which can be problematic and is therefore undesirable.
  • the baffles 18 serve to reduce corresponding swelling movements of the coolant 22 within the housing 12. However, since the coolant 22 should still be able to reach the line connection 16 regardless of the acceleration or position of the expansion tank 10, the baffles 18 each have at least one lower passage opening 26 on, through which the coolant 22 can flow.
  • the expansion tank 10 is shown in a rest position, in which a rest level 28 of the coolant 22 that is balanced across the chambers 20 has been established, in particular perpendicular to the direction of gravity in the intended installation position of the expansion tank 10. If the expansion tank 10 is now, for example, tilted in the plane of the drawing or If there is a corresponding acceleration in the plane of the drawing perpendicular to the main direction of extension of the baffles 18, i.e. perpendicular to an imaginary connecting line between the filling point 14 and the line connection 16, the coolant 22 will initially shift so that, for example, the intermediate filling levels 30 indicated here in the individual chambers 20 can adjust.
  • the coolant 22 In order to ensure that the line connection 16 is supplied or covered even in such acceleration or tilting situations, the coolant 22 must be leveled across the chambers 20 desirable.
  • the baffles 18 each have at least one upper passage opening 24 above the resting level 28 . An exchange of air between the chambers 20 can take place through these upper passage openings 24 , as a result of which the filling level or level compensation of the coolant 22 across the chambers 20 is ultimately made possible.
  • an equalization fill level 32 of the coolant 22, which is also indicated schematically here, will thus be established.
  • the upper passage openings 24 have a greater flow resistance than the lower passage openings 26 for a given medium.
  • the upper passage openings 24 are designed to be smaller than the lower passage openings 26 here. The greater flow resistance of the upper passage openings 24 results in a correspondingly adapted pressure loss behavior for damping swelling or sloshing movements of the coolant 22 or leveling out the coolant 22 between the chambers 20 under dynamic loading.
  • FIG. 2 shows the expansion tank 10 in a second cross-sectional view along the section line BB indicated in FIG. 1 .
  • the lower through-openings 26 are not only larger than the upper through-openings 24, but are also shaped differently from them.
  • the upper passage openings 24 are round, while the lower passage openings 26 are designed as rounded rectangles.
  • other, in particular identical, shapes of the passage openings 24, 26 are also possible.
  • the exact sizes, size ratios and/or shapes of the passage openings 24, 26 can be determined, for example for the coolant 22 provided in the respective application and/or a respectively provided internal pressure of the expansion tank 10, by a computer or model-based simulation or optimization.
  • the upper passage openings 26 for a water-based coolant 22 and otherwise air-filled chambers 20 can have a diameter in the range from 1.5 mm to 4 mm, preferably around 2 mm, for example.
  • the equalizing tank 10 also has a ventilation line 34 which is routed in the direction of a floor in which the line connection 16 is arranged, ie an underside of the equalizing tank 10 up to the area or a height of the lower passage openings 26 . At its other, upper end, the ventilation line 34 is guided into a region of the expansion tank 10 , in particular one of the chambers 20 , which is above the resting level 28 .
  • venting line 34 is also connected or provided here with a venting connector 36 that is routed to the outside, that is to say into an area surrounding the expansion tank 10 .
  • the expansion tank 10 can have further details or features, for example one or more ventilation openings and/or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

L'invention concerne un réservoir de compensation destiné à un système d'agent de refroidissement, et un véhicule automobile équipé dudit réservoir. Un volume interne du réservoir de compensation est divisé en une pluralité de chambres par au moins une paroi déflectrice pour amortir un mouvement d'un agent de refroidissement dans le réservoir de compensation. La paroi déflectrice comprend une ouverture de passage inférieure, à travers laquelle un fluide peut s'écouler et qui, par rapport à une direction de gravité, est disposée au-dessous d'un niveau de remplissage minimal prévu du réservoir de compensation dans la position d'installation prévue du réservoir de compensation, et une ouverture de passage supérieure, à travers laquelle de l'air peut s'écouler et qui est disposée au-dessus d'un niveau de remplissage maximal prévu. Les chambres sont couplées les unes aux autres par lesdites ouvertures de passage. Il est prévu ici que, pour un milieu prédéfini, l'ouverture de passage supérieure présente une résistance à l'écoulement supérieure à celle de l'ouverture de passage inférieure.
PCT/EP2021/071608 2020-09-01 2021-08-03 Réservoir de compensation pour un système d'agent de refroidissement, et véhicule automobile WO2022048842A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020122797.3A DE102020122797A1 (de) 2020-09-01 2020-09-01 Ausgleichsbehälter für ein Kühlmittelsystem und Kraftfahrzeug
DE102020122797.3 2020-09-01

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WO2022048842A1 true WO2022048842A1 (fr) 2022-03-10

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PCT/EP2021/071608 WO2022048842A1 (fr) 2020-09-01 2021-08-03 Réservoir de compensation pour un système d'agent de refroidissement, et véhicule automobile

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WO (1) WO2022048842A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114687851B (zh) * 2022-03-24 2022-09-16 浙江德众汽车零部件制造有限公司 膨胀水壶

Citations (8)

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Publication number Priority date Publication date Assignee Title
EP0545789A1 (fr) * 1991-12-06 1993-06-09 Valeo Thermique Moteur Vase d'expansion pour circuit de refroidissement à changement d'état
DE102013001681A1 (de) * 2012-03-08 2013-09-12 Kunststoff Schwanden Ag Ausgleichsbehälter des Kühlsystems einer Verbrennungskraftmaschine
JP2014066250A (ja) * 2013-11-28 2014-04-17 Mitsubishi Motors Corp 冷却水タンクの構造
EP2762696A1 (fr) 2013-02-04 2014-08-06 CLAAS Selbstfahrende Erntemaschinen GmbH Réservoir compensateur
EP3051093A1 (fr) * 2015-01-29 2016-08-03 Hitachi Construction Machinery Co., Ltd. Réservoir de détente
WO2017056475A1 (fr) * 2015-09-28 2017-04-06 本田技研工業株式会社 Vase d'expansion
EP3301274A1 (fr) * 2016-09-30 2018-04-04 Novares France Circuit de refroidissement pour un véhicule automobile
DE102018102235A1 (de) 2018-02-01 2019-08-01 Man Truck & Bus Ag Ausgleichsbehälter für Kühlkreisläufe mit unterschiedlichem Temperaturniveau und Druckaddition

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Publication number Priority date Publication date Assignee Title
DE102013203308A1 (de) 2013-02-27 2014-08-28 Bayerische Motoren Werke Aktiengesellschaft Brennstoffzellensystem
DE102019212096A1 (de) 2019-08-13 2021-02-18 Volkswagen Aktiengesellschaft Ausgleichbehälter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0545789A1 (fr) * 1991-12-06 1993-06-09 Valeo Thermique Moteur Vase d'expansion pour circuit de refroidissement à changement d'état
DE102013001681A1 (de) * 2012-03-08 2013-09-12 Kunststoff Schwanden Ag Ausgleichsbehälter des Kühlsystems einer Verbrennungskraftmaschine
EP2762696A1 (fr) 2013-02-04 2014-08-06 CLAAS Selbstfahrende Erntemaschinen GmbH Réservoir compensateur
JP2014066250A (ja) * 2013-11-28 2014-04-17 Mitsubishi Motors Corp 冷却水タンクの構造
EP3051093A1 (fr) * 2015-01-29 2016-08-03 Hitachi Construction Machinery Co., Ltd. Réservoir de détente
WO2017056475A1 (fr) * 2015-09-28 2017-04-06 本田技研工業株式会社 Vase d'expansion
EP3301274A1 (fr) * 2016-09-30 2018-04-04 Novares France Circuit de refroidissement pour un véhicule automobile
DE102018102235A1 (de) 2018-02-01 2019-08-01 Man Truck & Bus Ag Ausgleichsbehälter für Kühlkreisläufe mit unterschiedlichem Temperaturniveau und Druckaddition

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Title
MÜLLER P ET AL: "VERDAMPFUNGSKÜHLUNGEINE ALTERNATIVE ZUR KONVEKTIONSKÜHLUNG?", MTZ - MOTORTECHNISCHE ZEITSCHRIFT, SPRINGER, vol. 56, no. 12, 1 December 1995 (1995-12-01), pages 714 - 716, 718, XP000539851, ISSN: 0024-8525 *

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