EP2020489A1 - Dispositif destiné au refroidissement d'un moteur - Google Patents

Dispositif destiné au refroidissement d'un moteur Download PDF

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Publication number
EP2020489A1
EP2020489A1 EP08012972A EP08012972A EP2020489A1 EP 2020489 A1 EP2020489 A1 EP 2020489A1 EP 08012972 A EP08012972 A EP 08012972A EP 08012972 A EP08012972 A EP 08012972A EP 2020489 A1 EP2020489 A1 EP 2020489A1
Authority
EP
European Patent Office
Prior art keywords
fan
gap
flow
wall
space
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Withdrawn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
EP08012972A
Other languages
German (de)
English (en)
Inventor
Johannes Diem
Eberhard Pantow
Ulrich Vollert
Uwe Blass
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP2020489A1 publication Critical patent/EP2020489A1/fr
Withdrawn legal-status Critical Current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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2070/00—Details
    • F01P2070/50—Details mounting fans to heat-exchangers

Definitions

  • the present invention relates to a device for cooling a motor according to the preamble of claim 1 and a motor vehicle with such a device.
  • US 3,937,192 describes various versions of a connected via a fan cowl to a coolant radiator fan, which is directly driven by drive belt of an internal combustion engine.
  • a fan cowl to a coolant radiator fan, which is directly driven by drive belt of an internal combustion engine.
  • the entire air flow exits the fan cover in the direction of the fan axis.
  • the angle between a main direction of the gap flow and the fan axis is at least about 30 °. Particularly advantageously, the angle is at least about 45 ° and particularly preferably at least about 65 °. With increasing angle is further avoided that the air derived in the outer space collides with the hot engine block, swirled and returned to the area of the heat exchanger.
  • an edge of the fan cover adjoining the fan is advantageously inclined outwards at an angle to the fan axis. This allows the function of a radial discharge of air in the manner of a baffle.
  • the edge of the fan cowl in the axial direction terminates essentially in one plane with the fan.
  • air which flows largely radially from the ends of the fan blades, radially emerge and support the gap flow and / or mix with it.
  • the fan on the side of the outer space in the axial direction protrudes beyond the edge of the fan cowl. In this area, the radially accelerated radially from the edges of the fan to the outside air can flow optimally radially.
  • the fan has a plurality of radially directed fan blades with at least partially open ends, wherein over the open ends substantially radially outwardly flowing air flows past the gap.
  • a dynamic pressure reduction in the region of the gap is generated in the manner of a Venturi effect, so that the gap flow is assisted or even generated.
  • the radial flow of the fan tips is a motive flow for generating a negative pressure to a second flow (suction flow), so that overall the delivery rate of the fan system is increased at a given fan speed.
  • suction flow second flow
  • the opening area of the fan cover is increased in the outer space and improved according to the volume flow of the air.
  • the gap is designed as a gap channel delimited by a first wall enclosing the fan and a second wall enclosing the first wall.
  • the gap channel has a narrowing in the flow direction cross-section. In this way, a nozzle effect is given, by which in particular a stream of air flowing past the gap can exert a suction effect on air located in the gap channel.
  • the first wall is arranged stationary to the fan and the second wall is arranged stationary to the fan cover.
  • This can be z. B. be useful if the fan is a mechanically driven and connected to the motor fan, so basically a certain movement or vibration between the fan relative to the fan cover occurs.
  • the first wall then forms a periphery of the fan in the manner of a fan cowl. From the prior art, it is known in such arrangements to connect an edge of the fan cowl with the fan cowl via an elastic sealing lip in order to provide a total enclosed as close as possible fan. In the inventive solution of a radial outflow of air, in particular in conjunction with a suction flow effect can be dispensed with such means.
  • the first wall and the second wall of the gap channel are arranged on the fan cowling, in particular if the vibratory movements of the fan relative to the fan cowl are sufficiently small.
  • the fan cowl with two walls be designed as an injection molded part, wherein the walls are connected by a plurality of radial webs firmly together.
  • the gap channel has a movable cover means, wherein the cross section of the gap channel is changed depending on the position of the cover means.
  • the covering means may substantially comprise the second wall, wherein the second wall may consist in particular of a flexible material.
  • the gap channel also has stop means for conditioning the covering means, in particular in a maximum closed position.
  • the gap channel has a variable cross section in the manner of a dynamic pressure flap, so that it is at least partially closed at low back pressure in the flow space and opens with increasing back pressure.
  • An increasing opening of the cover element can also be induced by a venturi effect of a blowing current that is radially emitted by the fan.
  • a venturi effect of a blowing current that is radially emitted by the fan.
  • a total of the maximum possible opening of the gap can be designed to be particularly large by such a cover, whereby the adaptation of the device to different operating conditions is further optimized.
  • the first wall may be formed as a running jacket of the fan.
  • the jacket covers the fan blades only partially in the axial direction, whereby in the region of the uncovered fan blades, preferably a radial outflow of the air takes place via the free end regions of the fan blades. This radially outflowing air can then generate a suction flow between the first wall formed as a running jacket and the fixed second wall provided on the fan cover.
  • At least one dynamic pressure flap can be provided in order to further optimize the flow behavior in the fan cowl.
  • Dynamic pressure flaps are known at least from the field of passenger cars to ensure greater flow through the flow space at high speeds, since the fan is often "overblown" in such an operating state.
  • the fan is arranged on the motor and is driven by the latter.
  • the speed of the fan relative to the speed of the motor can be changed, in particular by means of a coupling member.
  • Possible coupling members for changing the speed may be a simple on / off clutch or a variably adjusting the speed viscous coupling or other known types of couplings.
  • the invention also relates to a motor vehicle having a device according to the invention for cooling an engine according to any one of claims 1 to 18.
  • the motor vehicle is designed as a commercial vehicle, in particular a truck.
  • the arrangement of mechanically driven fans on the engine is widespread. In such vehicles is also regularly above the engine sufficient space available to dissipate the air flowing from the gap in at least partially radial direction.
  • At least one dynamic pressure flap is provided in the fan cover.
  • the fan is arranged on the motor and is driven by this.
  • the speed of the fan is variable relative to the speed of the motor, in particular by means of a coupling member.
  • a motor vehicle comprising a device for cooling an engine.
  • the motor vehicle is a commercial vehicle, in particular a truck.
  • the device according to the invention comprises a heat exchanger 1, which is designed as a coolant radiator of an internal combustion engine of a motor vehicle, in the present case of a heavy goods vehicle.
  • the coolant radiator 1 is formed in a known manner as a flat element, which is arranged transversely to the direction of travel in the front region of the vehicle and can be flowed through by the wind.
  • the coolant radiator 1 is completely covered in the present case by a fan cowl 2, wherein between the heat exchanger 1 and a rear wall 2a of the fan cowl 2, a flow space 3 is enclosed to flow through with air emerging from the coolant radiator 1.
  • an outer space 4 is defined, into which the air leaving the fan cowl enters.
  • the fan cowling In the region of its rear wall 2a, the fan cowling has an opening 2b for this purpose, which is surrounded by an annular wall 5.
  • the annular wall 5 extends in cross-section radially outwardly directed in a curved shape, wherein an end portion 5 a of the wall 5 is directed at an angle of about 65 ° relative to an axial direction of the main air flow.
  • a fan 6 is arranged, which is surrounded by a wall 7 in the manner of a fan cowl.
  • the fan frame 7 and the fan 6 are each firmly connected to an internal combustion engine 10 of the motor vehicle, so that the gap between the fan 6 and wall 7 can be made small.
  • the fan frame or also the first wall 7 is shaped similar to the wall 5 of the fan cowl 2, so that a gap channel 8 is formed between the walls 5, 7.
  • the distance between the walls 5, 7 tapers in the flow direction of the air from the flow space 3 into the outer space 4.
  • the fan 6 is an axial fan with fan blades 6a open in the radial direction.
  • the fan blades 6a are arranged in a plane with an outside space edge of the fan cowl or first wall 7, wherein a rear end of the fan blades 6a protrudes slightly beyond a rear edge 7a of the first wall 7 in the axial direction.
  • FIG. 2 In the enlarged view Fig. 2 is explained by means of the, the air currents hinting arrows the function of the device.
  • the radially open fan blades of the fan 6 cause during operation of the fan at its radial end portions a radial outflow of air, which is indicated by the arrows A.
  • This radial outflow A is in a fairly steep Angle of 70 to 80 ° directed relative to the fan axis 6b and flows past the outlet gap 8a of the gap channel 8.
  • a reduced pressure is generated in the gap channel 8 in the manner of a Venturi effect, so that a suction flow B emerges from the gap channel 8.
  • the suction flow B also has a clearly radial component, so that the resulting total flow leaves the edge region of the fan at an angle of approximately 65 °.
  • the gap channel 8 at given fan dimensions and given fan speed is an enlarged outlet opening of the fan cover 2.
  • there is basically the problem of possible overblowing of the fan by the additional opening in the fan cover by means of the annular gap 8 for a given size of the fan. 6 is reduced or avoided.
  • the cooling gap of the device under different operating conditions is thus optimized by the annular gap of the device according to the invention, in particular in conjunction with the Venturi effect of the air flowing radially from the fan via the annular gap 8.
  • Fig. 3 is a functional development of in Fig. 1 and Fig. 2 shown device shown.
  • the region of the second wall 5 of the fan cowl 2 is formed of a flexible material, such as a foil or rubber.
  • the second wall 5 may be inclined radially inwardly due to its flexible properties or radially outward.
  • the cross section of the flow gap 8 is reduced, and even a concern of the flexible wall 5 on the first wall 7 can lead to a complete closure of the flow channel 8.
  • Fig. 3 both extreme positions of the flexible wall 5 are shown.
  • the wall 5 thus forms a movable cover element for changing the cross section of the flow gap 8.
  • the advantage here is that even with particularly unfavorable pressure conditions in which even the Venturi effect by the fan 6 does not ensure correct flow through the gap channel 8 from the flow space 3 in the outer space 4, a counterflow and thus an aerodynamic short circuit is avoided. In addition, thereby the maximum possible opening of the gap 8 can be made larger.
  • FIG. 4 and FIG. 5 show an expedient development of the embodiment Fig. 3 in which web-like stop means 9 are provided on the fan cowl 2, so that the flexible covering means 5 has a boundary in the radially inner direction. In this way, an eversion of the flexible cover 5 into the flow space 3 can be prevented.
  • the radially inwardly directed stop webs 9 shown which do not reach to the touch with the fan frame 7, since due to the vibrations of the motor relative to the coolant radiator 1, a corresponding minimum distance should be provided.
  • Fig. 6 shows a further embodiment of the device according to the invention, in which the gap channel 8 is formed between a wall 7 'rotating with the fan and a second wall 5 integrally formed with the fan shroud 2 as in the preceding embodiments.
  • the rotating wall 7 ' is shaped in the manner of a jacket of the fan 6, which only partly covers the fan blades 6a in the axial direction.
  • An outside space side area of the fan blades 6c is not covered by the casing 7 'and has radially free end portions, so that here a strong radial outflow A of air takes place in order to effect the venturi effect in the region of the gap channel 8.
  • the gap channel 8 is formed in each case as an annular channel around the circumference of the fan 6 around.
  • the invention is not limited to such a full circular shape of the gap channel 8.
  • the design of the fan guard and the heat exchanger and the arrangement of the fan relative to the fan guard of the gap channel 8 may also differ from the circular ring shape or be provided only in a sub-segment of the fan.
  • one or more additional dynamic pressure flaps in the fan cowl can be provided in each of the described embodiments.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP08012972A 2007-07-31 2008-07-18 Dispositif destiné au refroidissement d'un moteur Withdrawn EP2020489A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007036304A DE102007036304A1 (de) 2007-07-31 2007-07-31 Vorrichtung zur Kühlung eines Motors

Publications (1)

Publication Number Publication Date
EP2020489A1 true EP2020489A1 (fr) 2009-02-04

Family

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Family Applications (1)

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EP08012972A Withdrawn EP2020489A1 (fr) 2007-07-31 2008-07-18 Dispositif destiné au refroidissement d'un moteur

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Country Link
EP (1) EP2020489A1 (fr)
DE (1) DE102007036304A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236788A1 (fr) 2009-03-10 2010-10-06 Behr GmbH & Co. KG Dispositif de refroidissement pour un véhicule automobile
USD860427S1 (en) 2017-09-18 2019-09-17 Horton, Inc. Ring fan

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207552A1 (de) 2011-05-13 2012-11-15 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Kühlerlüftermodul
DE102021118148A1 (de) 2021-07-14 2023-01-19 Ebm-Papst Mulfingen Gmbh & Co. Kg Kühlvorrichtung mit zwei stirnseitigen voneinander getrennt anströmbaren Teilflächen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2269636A1 (en) * 1974-04-18 1975-11-28 Saviem Cooling system for supercharged diesel engine - uses air drawn through radiator to cool air from supercharger
US3937192A (en) 1974-09-03 1976-02-10 General Motors Corporation Ejector fan shroud arrangement
DE8614073U1 (de) * 1986-05-24 1988-04-07 Daimler-Benz Ag Kühleinrichtung an einer Brennkraftmaschine
WO2005100760A1 (fr) * 2004-04-08 2005-10-27 Behr Gmbh & Co. Kg Systeme de refroidissement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329946A (en) * 1979-10-09 1982-05-18 General Motors Corporation Shroud arrangement for engine cooling fan
JPS62195494A (ja) * 1986-02-21 1987-08-28 Aisin Seiki Co Ltd 内燃機関用冷却装置
KR0140195B1 (ko) * 1990-03-07 1998-07-01 다나까 다로오 압입식 축류 송풍기
JP4702014B2 (ja) * 2005-11-30 2011-06-15 マツダ株式会社 車両の冷却装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2269636A1 (en) * 1974-04-18 1975-11-28 Saviem Cooling system for supercharged diesel engine - uses air drawn through radiator to cool air from supercharger
US3937192A (en) 1974-09-03 1976-02-10 General Motors Corporation Ejector fan shroud arrangement
DE8614073U1 (de) * 1986-05-24 1988-04-07 Daimler-Benz Ag Kühleinrichtung an einer Brennkraftmaschine
WO2005100760A1 (fr) * 2004-04-08 2005-10-27 Behr Gmbh & Co. Kg Systeme de refroidissement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236788A1 (fr) 2009-03-10 2010-10-06 Behr GmbH & Co. KG Dispositif de refroidissement pour un véhicule automobile
US8573931B2 (en) 2009-03-10 2013-11-05 Behr Gmbh & Co. Kg Cooling apparatus for a motor vehicle
USD860427S1 (en) 2017-09-18 2019-09-17 Horton, Inc. Ring fan

Also Published As

Publication number Publication date
DE102007036304A1 (de) 2009-02-05

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