EP2278218A2 - Front headlamp with a cooler device - Google Patents
Front headlamp with a cooler device Download PDFInfo
- Publication number
- EP2278218A2 EP2278218A2 EP10002906A EP10002906A EP2278218A2 EP 2278218 A2 EP2278218 A2 EP 2278218A2 EP 10002906 A EP10002906 A EP 10002906A EP 10002906 A EP10002906 A EP 10002906A EP 2278218 A2 EP2278218 A2 EP 2278218A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat sink
- blower housing
- housing unit
- blower
- cooling
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 64
- 239000004065 semiconductor Substances 0.000 claims description 12
- 238000009826 distribution Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/30—Ventilation or drainage of lighting devices
- F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
- F21V29/677—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/20—Illuminance distribution within the emitted light
Definitions
- the present invention relates to a headlamp for a motor vehicle according to the preamble of claim 1.
- a headlamp has a heat source to be cooled and a cooling device having a heat sink coupled to the heat source and a fan with a blower housing cooling the heat sink Airflow generated.
- Such a headlight is supplied by the Applicant as LED (Light Emitting Diode) headlight for the Audi R8 and is therefore known in the market.
- LED Light Emitting Diode
- the LED array represents the heat source.
- Semiconductor light sources are currently increasing used in lighting devices of motor vehicles. After the use was initially limited to signal lights such as brake and turn signals, it is currently being begun to use semiconductor light sources for headlight functions, so for lighting the vehicle environment.
- LEDs Unlike halogen or gas discharge lamps, LEDs emit cold light.
- the radiation itself thus contains no heat radiation components which would be comparable to the corresponding proportions of a halogen lamp or gas discharge lamp. Nevertheless, even when operating LED losses of about 80% occur. This means that 80% of the electrical energy used for operation is released as heat loss and the LED heat up. This is problematic because important characteristics of LEDs such as their luminous flux, color, forward voltage and lifetime are highly temperature dependent.
- the temperature of the semiconductor light sources must therefore be within narrow, fixed limits by a predetermined thermal operating point. In particular, the LEDs must be protected against overheating.
- the maximum permissible chip temperature is between 125 ° C and 185 ° C. Exceeding the respective maximum temperature results in destruction of the LED. Since only about 20% of the electrical energy used is converted into light, headlamp heat losses occur, which can reach values between 20 watts and 40 watts.
- cooling concepts are used, in particular the large-area aluminum or copper heat sink of the above provide said type to absorb the heat loss and emit via cooling fins and / or other surface-enlarging structures to the environment.
- the cooling requirements are so high that the normal convective cooling is no longer sufficient and with a fan forced cooling must be done by a cooling air flow.
- the heat sink is usually arranged in the outlet air flow of the blower wherein the Auslassluftstromquerites is increased by a arranged between the fan and the heat sink diffuser from relatively small Geblääseauslassquerites on a comparatively largedeAvemanströmquerites.
- the headlamp according to the invention is characterized in that the heat sink forms a one-piece structural heat sink-blower housing unit with the blower housing.
- the blower is a radial blower or a diagonal blower with an impeller rotatable in the blower housing as a rotor.
- blowers offer advantages over axial fans, especially for heat sinks with small cross-sections and high air resistance, which require flow-optimized heat sinks with large cross-sections because of their low working pressure.
- radial fans can be built mechanically more robust compared to axial fans, since the motor and impeller can be mounted on a closed side wall of the fan housing.
- the heat sink-blower housing unit is adapted to receive the heat source on a parallel to the axis of rotation of the rotor wall of the heat sink stator housing unit.
- this housing wall deflects the air flow, it acts like a stator blade. The same applies to stator blades for this wall, this deflection effect reduces the thickness of the stationary and therefore insulating boundary layer in the air flow. As a result, particularly small thermal contact resistances are achieved here, which favors the desired cooling effect.
- the heat sink-blower housing unit is designed as a stator. Due to the design as a stator, the housing deflects the air flowing out of the blower wheel through the housing wall and possibly further stator blades in a preferred direction and generates a static pressure. Again, when deflecting the airflow on the stator blades, the stationary, i. insulating boundary layer in the air flow, is very thin, so that particularly small thermal contact resistance can be achieved. Since the stator and heat sink are designed in one component, only comparatively low wall friction losses occur.
- the heat sink housing unit offers the opportunity to divide the outlet air flow.
- the heat sink-blower housing unit is configured to divide the outlet air flow to a plurality outlet air partial streams. As a result, a plurality of light modules or heat sources can be cooled largely independently of each other.
- the heat sink-blower housing unit has at least one surface-enlarging structure arranged in an outlet airflow of the heat sink-blower housing unit.
- the ribs are arranged in the flow direction and thus along the outlet air flow and taper to one or both ends.
- the ribs are rounded at one or both ends. In both cases, the streamlined edge of the ribs should be given greater attention to rejuvenation and rounding. As a result, high volume flows, or high static pressures and thus good heat dissipation can be achieved.
- the inflowed end of the rib can be arranged transversely to a circumference of the rotor or in a plane with a circumference of the rotor.
- the invention is generally suitable for cooling heat sources in headlamps.
- semiconductor light sources can also be used to cool light-controlling control devices and / or power-stage arrangements of the headlamp with which, for example, adjusting drives of a cornering light module, headlight range control or a variable diaphragm arrangement are controlled.
- the heat source is arranged on an outer wall of the heat sink housing unit, you can therefore feed their dissipated heat by direct thermal contact in serving as a heat sink heat sink fan housing unit, the self is cooled by sweeping on their possibly smooth inner wall without great flow resistance along stroking air.
- FIG. 1 a headlight 10 having a headlight housing 12, a light module 14 arranged in the headlight housing 12 and a cover plate 18 permeable to light 16.
- the light 16 is generated by a semiconductor light source, which represents an example of a heat source 20 to be cooled.
- the light 16 generated by the semiconductor light source 20 is bundled and optionally additionally influenced in order to achieve a desired light distribution in front of the headlight 10.
- the optical element 22 is a reflector.
- aperture arrangements and / or lenses can be used as optical elements to realize reflection systems or projection systems and / or to produce different light distributions.
- the different light distributions differ, for example, as to whether or not they have a defined light-dark boundary and, if appropriate, how such a light-dark boundary is configured.
- the light module 14 is gimballed in the housing 12. to Headlamp leveling can be pivoted about the horizontal axis 24. A pivoting about a vertical axis 26 takes place for the realization of a cornering light function.
- the invention does not relate to these lighting functions but rather, the cooling of the heat source 20 of the headlight 10, in particular the cooling of a semiconductor light source. It is therefore to be understood that the invention is not limited to headlamps in the Fig. 1 is shown limited type. The Fig. 1 insofar serves merely to explain an example of a technical environment of the invention.
- the front headlight 10 has a cooling device 30 which has a heat sink 20 thermally coupled to the heat sink 32 and a blower 34 with a blower housing 36 which generates a cooling body 32 cooling air flow 38, 40.
- the heat sink 32 is usually a finned 42 flow cast or continuous casting heat sink made of a material having a good thermal conductivity. Typical representatives of such materials are aluminum, magnesium and copper as well as alloys based on these metals.
- the heat sink 32 In order to dissipate the heat generated by the semiconductor light source as to be cooled heat source 20 at a given cooling air flow 40 and given geometry, the heat sink 32 must have a certain heat capacity and surface. This contributes to the undesirably large space requirement.
- the cooling device 30 For cross-sectional adaptation between the comparatively small air outlet cross section of the blower 34 and the relatively large inflowing cross section of the cooling body 32, the cooling device 30 has a diffuser 44.
- This conventional sequential arrangement of blower 34, diffuser 44 and heat sink 32 results in an undesirably large length, which is for the realization of Curved lighting functions is disadvantageous.
- FIG. 2 shows the FIG. 2 a light module 46, the object of the FIG. 1 the light module 14 is replaced.
- the light module 46 results in an embodiment of a headlight according to the invention.
- the light module 46 has a Semiconductor light source 48 as a heat source to be cooled 20 and a cooling device 50, which has a heat sink coupled to the heat source 20 and a fan with a blower housing, which generates a heat sink cooling the air flow 40.
- the cooling device 50 of the FIG. 2 characterized in that the heat sink with the fan housing forms an integral structural heat sink fan housing unit 52. In the invention, therefore, a multiple use of the same structure 52 takes place as a fan housing and as a heat sink.
- 20 other components of the light module 46 are attached to the compact and stable structure of the heat sink-blower housing unit 52 in addition to the heat source.
- an optical element 22 in the form of a reflector, a diaphragm 54 and a lens carrier 56, which carries a projection lens 58.
- Other attachment, Storage or centering can be integrated in the manufacture of the heat sink-blower housing unit 52 in this.
- the heat sink-blower housing unit 52 is preferably made of the same material as the heat sink 32 of the FIG. 1 made of aluminum, magnesium, copper or an alloy containing at least one of these materials. In particular, injection molding methods are considered as suitable production methods.
- the blower housing 36 from the Fig. 1 which only serves to guide the air and therefore can be made of lightweight plastic, has the heat sink-blower housing unit preferably produced by injection molding 52 weight disadvantages.
- these weight penalties are overcompensated by the weight advantage resulting from the elimination of the separate heat sink 32 from the Fig. 1 results. In sum, one can count on the savings of about one third of the weight of the heat sink 32.
- the present invention is not limited to a particular type of blower and, in principle, can be operated with any device that converts mechanical energy into moving air flow energy.
- a radial fan or a diagonal fan is used with an impeller 60 rotatable in the heat sink fan unit 52 as a rotor or impeller.
- Fan shown is such a radial fan in which the cooling air is sucked perpendicular to the drawing plane from the environment.
- the air is initially in a central region of the rotatable as a rotor and acting as an impeller impeller 60 sucked and radially accelerated by blades of the impeller 60.
- the inner surface 62 of the here designed as a spiral housing heat sink-blower housing unit 52 acts under these circumstances as a stator blade, which deflects the radially accelerated air in the circumferential direction and thus in the drawn direction of the cooling air 40.
- the Fig. 2 shows in particular a heat sink and blower housing unit 52, which is designed as a stator. It is understood that further stator blades may be disposed between the impeller 60 and the inner surface 62.
- the described deflection of the air results in a high tangential air velocity and a very low density of the air boundary layer on the inner surface 62, which provides a small thermal resistance for the transfer of heat from the heat sink-blower housing unit 52 to the cooling air 40.
- This results in a very intense cooling effect which ensures that a cooling air flow 40 at the subject of the FIG. 2 absorbs heat better than an equal cooling air flow 40 at the subject of FIG. 1 , This allows the same amount of heat in the subject of FIG. 2 be discharged over a smaller area than the subject of the FIG. 1 ,
- heat sink-blower housing unit 52 is adapted to receive the heat source 20 on an outer wall of the heat sink-blower housing unit 52 which is parallel to the axis of rotation.
- stator housing as a spiral housing allows use of a radial fan or a diagonal fan.
- Spiral housings usually have a relatively large area, which has the advantage of a high heat capacity and a low thermal contact resistance with respect to the heat transfer to the cooling air flow in the complementary use as a heat sink.
- the cooling air sucked in from the direction of the impeller axis is blown out of the heat sink / blower housing unit 52 in the direction of the projection lens 58.
- This provides the additional advantage that the heated cooling air moisture, which can condense with changing temperatures and / or humidities in the headlight, absorbs and carries out with the air flow from the headlight.
- the heat sink-blower housing unit 52 has at least one surface-enlarging structure arranged in an outlet airflow 64 of the heat-sink blower housing unit 52.
- the increased surface area enhances the cooling of the heat source 20 via the heat sink-blower housing unit 52.
- FIG. 2 represent in the outlet air flow 40 arranged cooling fins 66, 68, 70 embodiments of such a surface-enlarging structure, wherein in place of three cooling fins 66, 68, 70 also more or fewer fins can be provided.
- the cooling fins 66, 68, 70 are preferably arranged along the outlet stream 64 and taper towards at least one of their two longitudinal ends. When pictured, they rejuvenate towards both ends. In addition, they should have at least at their end streamlined a rounded rib edge.
- the Fig. 3 shows an embodiment of a heat sink-blower housing unit 52, for a radial fan, in which the inflowed end of the cooling fin 66, 68, 70 is arranged transversely to a circumference of the sake of clarity, there not shown impeller 60.
- the Fig. 4 shows an alternative embodiment in which the inflow end of the rib 66, 68, 70 is arranged in each case in a plane with a circumference of the impeller 60.
- FIGS. 2 to 4 each show heat sink-blower housing units 52 with a single discharge nozzle as the outlet region and thus only a single, possibly by cooling fins 66, 68, 70 divided exhaust air flow 64th
- Fig. 5 an alternative embodiment, wherein a heat sink-blower housing unit 53 is arranged to divide the outlet air flow to a plurality outlet air partial streams 80, 82.
- This possibility of dividing the outlet air flow into a plurality of outlet air partial flows 80, 82 represents a further advantage of the heat sink fan housing unit 53.
- a plurality of light modules or heat sources can be cooled substantially independently of one another.
- the heat sink housing unit 53 has two or more tangential discharge ports 84, 86, via which the cooling air flow can be divided and fed to a plurality of different heat sources.
- this division offers the most compact design option.
- the two or more outlet air substreams 80, 82 are less affected than would be the case using a manifold after a single blower outlet.
- the Fig. 5 shows a division of two discharge ports 84, 86 and thus two Auslass Kunststoffströme 80, 82.
- This configuration allows the discharged through the second discharge port 86 cooling air 82 cooling a further light module or cooling another heat source in the headlight.
- the further heat source is, for example, a further semiconductor light source and / or a control device controlling the light functions of the pig-thrower and / or one associated power amplifier arrangement, this list should not be exhaustive.
- FIG. 5 An arrangement of adjustable aperture in the form of a diaphragm roller is in the Fig. 5 designated by the numeral 88.
- the shutter roller 88 replaces the fixed shutter 54 from the Fig. 2 and illustrates that the invention is not limited to use in a particular headlamp but is applicable to a variety of different headlamps having one or more heat sources to be cooled, such as semiconductor light sources and / or controllers and / or power stage assemblies.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen Frontscheinwerfer für ein Kraftfahrzeug nach dem Oberbegriff des Anspruchs 1. Ein solcher Frontscheinwerfer weist eine zu kühlende Wärmequelle und eine Kühleinrichtung auf, die einen thermisch mit der Wärmequelle gekoppelten Kühlkörper sowie ein Gebläse mit einem Gebläsegehäuse aufweist, das einen den Kühlkörper kühlenden Luftstrom erzeugt.The present invention relates to a headlamp for a motor vehicle according to the preamble of claim 1. Such a headlamp has a heat source to be cooled and a cooling device having a heat sink coupled to the heat source and a fan with a blower housing cooling the heat sink Airflow generated.
Ein solcher Frontscheinwerfer wird von der Anmelderin als LED-Scheinwerfer (LED = Light Emitting Diode)für den Audi R8 geliefert und ist daher auf dem Markt bekannt. Bei diesem Frontscheinwerfer stellt die LED-Anordnung die Wärmequelle dar.Such a headlight is supplied by the Applicant as LED (Light Emitting Diode) headlight for the Audi R8 and is therefore known in the market. In this headlight, the LED array represents the heat source.
Halbleiterlichtquellen werden derzeit in zunehmendem Umfang in Beleuchtungseinrichtungen von Kraftfahrzeugen eingesetzt. Nachdem sich der Einsatz zunächst auf Signalleuchten wie Brems- und Blinkleuchten beschränkt hatte, wird derzeit damit begonnen, Halbleiterlichtquellen auch für Scheinwerferfunktionen, also für eine Beleuchtung des Fahrzeugumfeldes zu verwenden.Semiconductor light sources are currently increasing used in lighting devices of motor vehicles. After the use was initially limited to signal lights such as brake and turn signals, it is currently being begun to use semiconductor light sources for headlight functions, so for lighting the vehicle environment.
Im Gegensatz zu Halogenlampen oder Gasentladungslampen geben LED kaltes Licht ab. Die Strahlung selbst enthält also keine Wärmestrahlungsanteile, die mit den entsprechenden Anteilen einer Halogenlampe oder Gasentladungslampe vergleichbar wären. Trotzdem treten auch beim Betrieb von LED Verluste von ca. 80 % auf. Das heißt, dass 80 % der zum Betrieb eingesetzten elektrischen Energie als Verlustwärme frei werden und die LED aufheizen. Dies ist problematisch, weil wichtige Eigenschaften von LED wie deren Lichtstrom, Farbe, Vorwärtsspannung und Lebensdauer stark temperaturabhängig sind. Die Temperatur der Halbleiterlichtquellen muss daher innerhalb enger, fest vorgegebener Grenzen um einen vorbestimmten thermischen Arbeitspunkt liegen. Dabei müssen die LED insbesondere vor einer Überhitzung geschützt werden.Unlike halogen or gas discharge lamps, LEDs emit cold light. The radiation itself thus contains no heat radiation components which would be comparable to the corresponding proportions of a halogen lamp or gas discharge lamp. Nevertheless, even when operating LED losses of about 80% occur. This means that 80% of the electrical energy used for operation is released as heat loss and the LED heat up. This is problematic because important characteristics of LEDs such as their luminous flux, color, forward voltage and lifetime are highly temperature dependent. The temperature of the semiconductor light sources must therefore be within narrow, fixed limits by a predetermined thermal operating point. In particular, the LEDs must be protected against overheating.
Die maximal zulässige Chiptemperatur liegt je nach Hersteller zwischen 125°C und 185°C. Eine Überschreitung der jeweiligen Maximaltemperatur hat eine Zerstörung der LED zur Folge. Da nur etwa 20 % der eingesetzten elektrischen Energie in Licht umgewandelt werden, treten in Frontscheinwerfern Verlustwärmeleistungen auf, die Werte zwischen 20 Watt und 40 Watt erreichen können.Depending on the manufacturer, the maximum permissible chip temperature is between 125 ° C and 185 ° C. Exceeding the respective maximum temperature results in destruction of the LED. Since only about 20% of the electrical energy used is converted into light, headlamp heat losses occur, which can reach values between 20 watts and 40 watts.
Um diese im LED-Chip auftretenden Verlustwärmeleistungen ohne unzulässig hohe LED-Temperaturen zuverlässig abführen zu können, werden Kühlkonzepte angewandt, die insbesondere großflächige Aluminium- oder Kupfer-Kühlkörper der eingangs genannten Art vorsehen, um die Verlustwärme aufzunehmen und über Kühlrippen und/oder andere Oberflächen-vergrößernde Strukturen an die Umgebung abzugeben.In order to reliably dissipate these occurring in the LED chip loss heat outputs without inadmissibly high LED temperatures, cooling concepts are used, in particular the large-area aluminum or copper heat sink of the above provide said type to absorb the heat loss and emit via cooling fins and / or other surface-enlarging structures to the environment.
Oftmals sind die Anforderungen an die Kühlung so hoch, dass die normale konvektive Kühlung nicht mehr ausreicht und mit einem Gebläse eine Zwangskühlung durch einen Kühlluftstrom erfolgen muss. Dabei wird der Kühlkörper in der Regel im Auslass-Luftstrom des Gebläses angeordnet wobei der Auslassluftstromquerschnitt durch einen zwischen dem Gebläse und dem Kühlkörper angeordneten Diffusor vom vergleichsweise kleinen Gebläseauslassquerschnitt auf einen vergleichsweise großen Kühlkörperanströmquerschnitt vergrößert wird.Often, the cooling requirements are so high that the normal convective cooling is no longer sufficient and with a fan forced cooling must be done by a cooling air flow. In this case, the heat sink is usually arranged in the outlet air flow of the blower wherein the Auslassluftstromquerschnitt is increased by a arranged between the fan and the heat sink diffuser from relatively small Geblääseauslassquerschnitt on a comparatively large Kühlkörperanströmquerschnitt.
Bei dieser Hintereinanderschaltung von Gebläse und Kühlkörper sowie dem gegebenenfalls noch dazwischen angeordneten Diffusor ergibt sich eine große Baulänge. Dies ist nachteilig, da eine große Baulänge bei Kurvenlichtmodulen viel Platz zum Schwenken des Lichtmoduls benötigt. Dieser Platz ist in der Regel knapp. Außerdem schränkt der Platzbedarf den konstruktiven und gestalterischen Spielraum bei der
Scheinwerferwerferentwicklung ein, was unerwünscht ist.In this series connection of blower and heat sink and the optionally still interposed diffuser results in a large length. This is disadvantageous because a large length of curve lighting modules requires a lot of space to pivot the light module. This place is usually scarce. In addition, the space requirement limits the constructive and creative freedom in the
Spotlight development, which is undesirable.
Darüber hinaus ergibt sich durch die große Baulänge ein unerwünscht großes Verhältnis innerer Oberflächen der Kühlluft führenden Teile zum Volumen dieser Teile, was den durch Wandreibung verursachten Strömungswiderstand erhöht und damit größere und schwerere Kühleinrichtungen zur Erzielung einer vorbestimmten Kühlwirkung erfordert.In addition, results from the great length an undesirably large ratio of internal surfaces of the cooling air leading parts to the volume of these parts, which increases the wall friction caused by flow resistance and thus requires larger and heavier cooling devices to achieve a predetermined cooling effect.
Vor diesem Hintergrund besteht die Aufgabe der Erfindung in der Angabe eines Frontscheinwerfers der eingangs genannten Art, bei dem diese Nachteile zumindest verringert sind.Against this background, the object of the invention in the specification of a headlight of the type mentioned, in which these disadvantages, at least are reduced.
Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.
Der erfindungsgemäße Frontscheinwerfer zeichnet sich dadurch aus, dass der Kühlkörper mit dem Gebläsegehäuse eine einstückige bauliche Kühlkörper-Gebläsegehäuse-Einheit bildet.The headlamp according to the invention is characterized in that the heat sink forms a one-piece structural heat sink-blower housing unit with the blower housing.
Durch diese Merkmale wird ein Frontscheinwerfer mit einer besonders kompakten, vergleichsweise leichten und durch verringerte Strömungswiderstände effizienten und leistungsfähigen Kühlvorrichtung bereitgestellt.These features provide a headlamp with a particularly compact, comparatively lightweight and efficient and efficient cooling device through reduced flow resistances.
In einer bevorzugten Ausgestaltung ist das Gebläse ein Radialgebläse oder ein Diagonalgebläse mit einem in dem Gebläsegehäuse als Rotor drehbaren Gebläserad.In a preferred embodiment, the blower is a radial blower or a diagonal blower with an impeller rotatable in the blower housing as a rotor.
Solche Gebläse bieten vor allem bei Kühlkörpern mit kleinen Querschnitten und hohen Luftwiderständen Vorteile gegenüber Axialgebläsen, die wegen ihres geringen Arbeitsdrucks strömungsgünstige Kühlkörper mit großen Querschnitten benötigen. Außerdem lassen sich Radialgebläse im Vergleich zu Axialgebläsen mechanisch robuster aufbauen, da hier Motor und Gebläserad auf einer geschlossenen Seitenwand des Gebläsegehäuses montiert werden können.Such blowers offer advantages over axial fans, especially for heat sinks with small cross-sections and high air resistance, which require flow-optimized heat sinks with large cross-sections because of their low working pressure. In addition, radial fans can be built mechanically more robust compared to axial fans, since the motor and impeller can be mounted on a closed side wall of the fan housing.
In einer bevorzugten Ausgestaltung ist die Kühlkörper-Gebläsegehäuse-Einheit dazu eingerichtet, die Wärmequelle auf einer zur Drehachse des Rotors parallelen Wand der Kühlkörper-Stator-Gehäuse-Einheit aufzunehmen.In a preferred embodiment, the heat sink-blower housing unit is adapted to receive the heat source on a parallel to the axis of rotation of the rotor wall of the heat sink stator housing unit.
Da diese Gehäusewand den Luftstrom ablenkt, wirkt sie wie eine Statorschaufel. So wie für Statorschaufeln gilt auch für diese Wand, dass diese Ablenkwirkung die Dicke der unbewegten und damit isolierenden Grenzschicht in der Luftströmung verringert. Dadurch werden hier besonders kleine thermische Übergangswiderstände erzielt, was den erwünschten Kühleffekt begünstigt.Since this housing wall deflects the air flow, it acts like a stator blade. The same applies to stator blades for this wall, this deflection effect reduces the thickness of the stationary and therefore insulating boundary layer in the air flow. As a result, particularly small thermal contact resistances are achieved here, which favors the desired cooling effect.
Es ist daher auch unabhängig von der Anordnung der Wärmequelle bevorzugt, dass die Kühlkörper-Gebläsegehäuse-Einheit als Stator ausgebildet ist. Durch die Ausbildung als Stator lenkt das Gehäuse die aus dem Gebläserad ausströmende Luft durch die Gehäusewand und gegebenenfalls weitere Statorschaufeln in eine Vorzugsrichtung um und erzeugt einen statischen Druck. Auch hier gilt, dass beim Ablenken des Luftstroms an den Statorschaufeln die unbewegte, d.h. isolierende Grenzschicht in der Luftströmung, sehr dünn ist, so dass besonders kleine thermische Übergangswiderstände erzielt werden. Da Stator und Kühlkörper in einem Bauteil ausgeführt sind, treten nur vergleichsweise geringe Wandreibungsverluste auf.It is therefore also preferred regardless of the arrangement of the heat source, that the heat sink-blower housing unit is designed as a stator. Due to the design as a stator, the housing deflects the air flowing out of the blower wheel through the housing wall and possibly further stator blades in a preferred direction and generates a static pressure. Again, when deflecting the airflow on the stator blades, the stationary, i. insulating boundary layer in the air flow, is very thin, so that particularly small thermal contact resistance can be achieved. Since the stator and heat sink are designed in one component, only comparatively low wall friction losses occur.
Ein weiterer Vorteil der Kühlkörper-Gehäuse-Einheit besteht darin, dass sie die Möglichkeit bietet, den Auslassluftstrom aufzuteilen. In einer bevorzugten Ausgestaltung ist die Kühlkörper-Gebläsegehäuse-Einheit dazu eingerichtet, den Auslassluftstrom auf mehrere Auslassluftteilströme aufzuteilen. Dadurch können mehrere Lichtmodule bzw. Wärmequellen weitgehend unabhängig voneinander gekühlt werden.Another advantage of the heat sink housing unit is that it offers the opportunity to divide the outlet air flow. In a preferred embodiment, the heat sink-blower housing unit is configured to divide the outlet air flow to a plurality outlet air partial streams. As a result, a plurality of light modules or heat sources can be cooled largely independently of each other.
Bevorzugt ist auch, dass die Kühlkörper-Gebläsegehäuse-Einheit wenigstens eine in einem Auslassluftstrom der Kühlkörper-Gebläsegehäuse-Einheit angeordnete Oberflächen-vergrößernde Struktur aufweist.It is also preferable that the heat sink-blower housing unit has at least one surface-enlarging structure arranged in an outlet airflow of the heat sink-blower housing unit.
Dadurch wird die für den Übergang der Wärme von der Kühlkörper-Gebläsegehäuse-Einheit auf den Kühlluftstrom zur Verfügung stehende Oberfläche vergrößert, was die Kühlwirkung verbessert.This will change the heat transfer from the Heatsink fan housing unit increases on the cooling air flow available surface, which improves the cooling effect.
Durch wenigstens eine im Auslassluftstrom angeordnete Kühlrippe, die im Kühlluftstrom steht, wird die Laminarität und Wirbelfreiheit des Kühlluftstroms verbessert. Bevorzugt sind die Rippen in Strömungsrichtung und damit längs des Auslassluftstroms angeordnet und verjüngen sich zu einem oder beiden Enden. Idealerweise sind die Rippen an einem oder beiden Enden verrundet. In beiden Fällen ist der angeströmten Kante der Rippen die größere Aufmerksamkeit hinsichtlich Verjüngung und Verrundung zu widmen. Dadurch können hohe Volumenströme, beziehungsweise hohe statische Drücke und damit eine gute Wärmeabfuhr erzielt werden.By at least one arranged in the outlet air flow cooling fin, which is in the cooling air flow, the laminarity and vortex freedom of the cooling air flow is improved. Preferably, the ribs are arranged in the flow direction and thus along the outlet air flow and taper to one or both ends. Ideally, the ribs are rounded at one or both ends. In both cases, the streamlined edge of the ribs should be given greater attention to rejuvenation and rounding. As a result, high volume flows, or high static pressures and thus good heat dissipation can be achieved.
Dabei kann das angeströmte Ende der Rippe quer zu einem Umfang des Rotors oder in einer Ebene mit einem Umfang des Rotors angeordnet sein.In this case, the inflowed end of the rib can be arranged transversely to a circumference of the rotor or in a plane with a circumference of the rotor.
Die Erfindung eignet sich allgemein zur Kühlung von Wärmequellen in Frontscheinwerfern. Neben
Halbleiterlichtquellen können je nach Ausgestaltung auch Lichtfunktionen steuernde Steuergeräte und/oder Endstufenanordnungen des Frontscheinwerfers gekühlt werden, mit denen zum Beispiel Verstellantriebe eines Kurvenlichtmoduls, einer Leuchtweitenregulierung oder einer variablen Blendenanordnung angesteuert werden.The invention is generally suitable for cooling heat sources in headlamps. Next
Depending on the design, semiconductor light sources can also be used to cool light-controlling control devices and / or power-stage arrangements of the headlamp with which, for example, adjusting drives of a cornering light module, headlight range control or a variable diaphragm arrangement are controlled.
Dabei ist jeweils bevorzugt, dass die Wärmequelle auf einer Außenwand der Kühlkörper-Gehäuse-Einheit angeordnet ist, Sie kann daher ihre abzuführende Wärme durch direkten thermischen Kontakt in die als Wärmesenke dienende Kühlkörper-Gebläsegehäuse-Einheit einspeisen, die selbst durch die an ihrer gegebenenfalls glatten Innenwand ohne großen Strömungswiderstand entlang streichende Gebläseluft gekühlt wird.It is preferred in each case that the heat source is arranged on an outer wall of the heat sink housing unit, you can therefore feed their dissipated heat by direct thermal contact in serving as a heat sink heat sink fan housing unit, the self is cooled by sweeping on their possibly smooth inner wall without great flow resistance along stroking air.
Weitere Vorteile ergeben sich aus den abhängigen Ansprüchen, der Beschreibung und den beigefügten Figuren.Further advantages will be apparent from the dependent claims, the description and the attached figures.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen, jeweils in schematischer Form:
- Fig. 1
- eine stark schematisierte Darstellung eines bekannten Frontscheinwerfers;
- Fig. 2
- einen Querschnitt durch ein Lichtmodul eines Ausführungsbeispiels eines erfindungsgemäßen Frontscheinwerfers;
- Fig. 3
- ein Spiralgehäuse mit einer ersten Ausgestaltung einer Anordnung von Kühlrippen;
- Fig. 4
- ein Spiralgehäuse mit einer zweiten Ausgestaltung einer Anordnung von Kühlrippen; und
- Fig. 5
- einen Querschnitt durch ein Lichtmodul eines weiteren Ausführungsbeispiels eines erfindungsgemäßen Frontscheinwerfers.
- Fig. 1
- a highly schematic representation of a known headlamp;
- Fig. 2
- a cross section through a light module of an embodiment of a headlight according to the invention;
- Fig. 3
- a volute casing having a first configuration of an arrangement of cooling fins;
- Fig. 4
- a volute casing having a second configuration of an arrangement of cooling fins; and
- Fig. 5
- a cross section through a light module of another embodiment of a headlight according to the invention.
Im Einzelnen zeigt die
Durch optische Elemente 22 wird das von der Halbleiterlichtquelle 20 erzeugte Licht 16 gebündelt und gegebenenfalls zusätzlich beeinflusst, um eine gewünschte Lichtverteilung vor dem Frontscheinwerfer 10 zu erzielen. In der dargestellten Ausgestaltung ist das optische Element 22 ein Reflektor. Alternativ oder ergänzend können Blendenanordnungen und/oder Linsen als optische Elemente verwendet werden, um Reflexionssysteme oder Projektionssysteme zu realisieren und/oder um verschiedene Lichtverteilungen zu erzeugen. Die verschiedenen Lichtverteilungen unterscheiden sich zum Beispiel dadurch, ob sie eine definierte Hell-Dunkelgrenze aufweisen oder nicht und gegebenenfalls darin, wie eine solche Hell-Dunkelgrenze ausgestaltet ist.By means of
In der dargestellten Ausgestaltung ist das Lichtmodul 14 kardanisch im Gehäuse 12 aufgehängt. Zur
Leuchtweitenregulierung kann es um die waagerechte Achse 24 geschwenkt werden. Eine Schwenkung um eine vertikale Achse 26 erfolgt zur Realisierung einer Kurvenlichtfunktion. Diese Lichtfunktionen und die zu ihrer Erzielung erforderlichen Ausgestaltungen optischer Elemente, Schwenkantriebe und Steuerelemente sind dem Fachmann vertraut und bedürfen daher an dieser Stelle keiner weiteren Erläuterung.In the illustrated embodiment, the
Headlamp leveling can be pivoted about the
Die Erfindung betrifft nicht diese Lichtfunktionen sondern vielmehr die Kühlung der Wärmequelle 20 des Frontscheinwerfers 10, insbesondere die Kühlung einer Halbleiterlichtquelle. Es versteht sich daher, dass die Erfindung nicht auf Scheinwerfer der in der
Zum Zweck der Kühlung der Wärmequelle 20 weist der Frontscheinwerfer 10 eine Kühleinrichtung 30 auf, die einen mit der Wärmequelle 20 thermisch gekoppelten Kühlkörper 32 sowie ein Gebläse 34 mit einem Gebläsegehäuse 36 aufweist, das einen den Kühlkörper 32 kühlenden Luftstrom 38, 40 erzeugt.For the purpose of cooling the
Bei dem Kühlkörper 32 handelt es sich in der Regel um einen mit Rippen 42 versehenen Fließguss- oder Strangguss-Kühlkörper aus einem Werkstoff, der eine gute Wärmeleitfähigkeit besitzt. Typische Vertreter solcher Werkstoffe sind Aluminium, Magnesium und Kupfer sowie auf diesen Metallen basierende Legierungen.The
Um die von der Halbleiterlichtquelle als zu kühlender Wärmequelle 20 erzeugte Wärme bei gegebenem Kühlluftstrom 40 und gegebener Geometrie abzuführen, muss der Kühlkörper 32 eine gewisse Wärmekapazität und Oberfläche besitzen. Diese trägt zu dem unerwünscht großen Bauraumbedarf bei. Zur Querschnittsanpassung zwischen dem vergleichsweise kleinen Luftauslassquerschnitt des Gebläses 34 und dem relativ großen anzuströmenden Querschnitt des Kühlkörpers 32 weist die Kühleinrichtung 30 einen Diffusor 44 auf. Diese herkömmliche Hintereinander-Anordnung von Gebläse 34, Diffusor 44 und Kühlkörper 32 ergibt eine unerwünscht große Baulänge, was für die Realisierung von
Kurvenlichtfunktionen nachteilig ist. Außerdem führt die Hintereinander-Anordnung zu Verlusten an Strömungsenergie durch Luftreibung und Verwirbelung im Gebläse 34, dem Diffusor 44 und dem Kühlkörper 32.In order to dissipate the heat generated by the semiconductor light source as to be cooled
Curved lighting functions is disadvantageous. In addition, the leads Sequential arrangement to losses of flow energy by air friction and turbulence in the
Im Folgenden wird unter Bezug auf die
Im Einzelnen weist das Lichtmodul 46 eine
Halbleiterlichtquelle 48 als zu kühlende Wärmequelle 20 und eine Kühleinrichtung 50 auf, die einen thermisch mit der Wärmequelle 20 gekoppelten Kühlkörper sowie ein Gebläse mit einem Gebläsegehäuse aufweist, das einen den Kühlkörper kühlenden Luftstrom 40 erzeugt.In detail, the
Im Gegensatz zum Gegenstand der
Bei einer bevorzugten Ausgestaltung werden neben der Wärmequelle 20 weitere Komponenten des Lichtmoduls 46 an der kompakten und stabilen Struktur der Kühlkörper-Gebläsegehäuse-Einheit 52 befestigt. Beim Gegenstand der
Die Kühlkörper-Gebläsegehäuse-Einheit 52 ist bevorzugt aus dem gleichen Material wie der Kühlkörper 32 aus der
Im Vergleich zu dem Gebläsegehäuse 36 aus der
Die vorliegende Erfindung ist nicht auf einen bestimmten Gebläsetyp beschränkt und kann im Prinzip mit jeder Vorrichtung, die mechanische Energie in Strömungsenergie bewegter Luft umwandelt, betrieben werden. In einer bevorzugten Ausgestaltung wird jedoch ein Radialgebläse oder ein Diagonalgebläse mit einem in der Kühlkörper-Gebläsegebläse-Einheit 52 als Rotor oder Impeller drehbaren Gebläserad 60 verwendet.The present invention is not limited to a particular type of blower and, in principle, can be operated with any device that converts mechanical energy into moving air flow energy. In a preferred embodiment, however, a radial fan or a diagonal fan is used with an
Bei dem in der
Durch die beschriebene Umlenkung der Luft ergibt sich eine hohe tangentiale Luftgeschwindigkeit und eine sehr geringe Dichte der Luftgrenzschicht an der Innenfläche 62, was für einen kleinen Wärmewiderstand für den Übergang von Wärme aus der Kühlkörper-Gebläsegehäuse-Einheit 52 auf die Kühlluft 40 sorgt. Daraus ergibt sich eine sehr intensive Kühlwirkung, die dafür sorgt, dass ein Kühlluftstrom 40 beim Gegenstand der
Dies gilt insbesondere für die Flächen der Kühlkörper-Gebläsegehäuse-Einheit 52, an denen innerhalb der Kühlkörper-Gebläsegehäuse-Einheit 52 hohe Luftgeschwindigkeiten herrschen, was zum Beispiel an den zur Drehachse des Gebläserades 60 parallelen Wänden der Kühlkörper-Gebläsegehäuse-Einheit 52, also an der Innenfläche 62 der Fall ist. Ein bevorzugte Ausgestaltung zeichnet sich daher dadurch aus, dass die Kühlkörper-Gebläsegehäuse-Einheit 52 dazu eingerichtet ist, die Wärmequelle 20 auf einer zur Drehachse parallelen Außenwand der Kühlkörper-Gebläsegehäuse-Einheit 52 aufzunehmen.This applies in particular to the surfaces of the heat sink-
Eine Ausführung des Statorgehäuses als Spiralgehäuse ermöglicht eine Nutzung eines Radialgebläses oder eines Diagonalgebläses. Spiralgehäuse weisen in der Regel eine vergleichsweise große Fläche auf, was bei der ergänzenden Nutzung als Kühlkörper den Vorteil einer hohen Wärmekapazität und eines niedrigen thermischen Übergangswiderstands in Bezug auf die Wärmeübertragung auf den Kühlluftstrom hat.An embodiment of the stator housing as a spiral housing allows use of a radial fan or a diagonal fan. Spiral housings usually have a relatively large area, which has the advantage of a high heat capacity and a low thermal contact resistance with respect to the heat transfer to the cooling air flow in the complementary use as a heat sink.
Die aus Richtung der Impellerachse angesaugte Kühlluft wird in der dargestellten Ausgestaltung in Richtung zur Projektionslinse 58 aus der Kühlkörper-Gebläsegehäuse-Einheit 52 ausgeblasen. Dies liefert den zusätzlichen Vorteil, dass die aufgeheizte Kühlluft Feuchtigkeit, die bei wechselnden Temperaturen und/oder Luftfeuchtigkeiten im Frontscheinwerfer kondensieren kann, aufnimmt und mit dem Luftstrom aus dem Frontscheinwerfer herausträgt.In the illustrated embodiment, the cooling air sucked in from the direction of the impeller axis is blown out of the heat sink /
In einer Ausgestaltung weist die Kühlkörper-Gebläsegehäuse-Einheit 52 wenigstens eine in einem Auslassluftstrom 64 der Kühlkörper-Gebläsegehäuse-Einheit 52 angeordnete Oberflächen-vergrößernde Struktur auf. Durch die vergrößerte Oberfläche wird die über die Kühlkörper-Gebläsegehäuse-Einheit 52 erfolgende Entwärmung der Wärmequelle 20 verstärkt.In one embodiment, the heat sink-
Beim Gegenstand der
Die Kühlrippen 66, 68, 70 sind bevorzugt längs des Auslassstroms 64 angeordnet und verjüngen sich zu wenigstens einem ihrer beiden in Längsrichtung liegenden Enden hin. Beim abgebildeten Gegenstand verjüngen sie sich zu beiden Enden hin. Darüber hinaus sollen sie zumindest an ihrem angeströmten Ende eine abgerundete Rippenkante aufweisen.The cooling
Die
Die
Die
Die Gegenstände der
Im Gegensatz dazu offenbart die
Diese Möglichkeit der Aufteilung des Auslassluftstroms auf mehrere Auslassluftteilströme 80, 82 stellt einen weiteren Vorteil der Kühlkörper-Gebläsegehäuse-Einheit 53 dar. Dadurch können mehrere Lichtmodule bzw. Wärmequellen weitgehend unabhängig voneinander gekühlt werden. Zur Realisierung besitzt die Kühlkörper-Gehäuse-Einheit 53 zwei oder mehr tangentiale Druckstutzen 84, 86, über die der Kühlluftstrom aufgeteilt und zu mehreren unterschiedlichen Wärmequellen geführt werden kann. Im Gegensatz zu einer Aufteilung des Volumenstroms hinter dem Druckstutzen/Auslassbereich (Y-Rohrverzweigungen) bietet diese Aufteilung die kompakteste Ausführungsmöglichkeit.This possibility of dividing the outlet air flow into a plurality of outlet air partial flows 80, 82 represents a further advantage of the heat sink
Darüber hinaus beeinflussen sich die zwei oder mehr Auslassluftteilströme 80, 82 weniger als dies bei einer Verwendung einer Rohrverzweigung hinter einen einzigen Gebläseauslass der Fall wäre. Durch die Aufteilung der Luftströme in der Kühlkörper-Gebläsegehäuse-Einheit 53 können minimale Baugrößen für das Kühlsystem erzielt werden.Additionally, the two or more
Die
Über die Dimensionierung der Auslassquerschnitte der Druckstutzen 84, 86 und der jedem Druckstutzen 84, 86 wirkungsmäßig zugeordneten Länge der Spiralabschnitte wird die Aufteilung der Luftmengen konstruktiv beeinflusst.About the dimensioning of the outlet cross-sections of the
Eine Anordnung verstellbarer Blenden in Form einer Blendenwalze ist in der
Claims (12)
Applications Claiming Priority (1)
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DE102009033909A DE102009033909A1 (en) | 2009-07-20 | 2009-07-20 | Headlamp with a cooling device |
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EP2278218A2 true EP2278218A2 (en) | 2011-01-26 |
EP2278218A3 EP2278218A3 (en) | 2012-05-23 |
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EP (1) | EP2278218B1 (en) |
CN (1) | CN101956965B (en) |
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CN102252301A (en) * | 2011-06-23 | 2011-11-23 | 常州星宇车灯股份有限公司 | Radiating and defogging device for headlight |
CN102252301B (en) * | 2011-06-23 | 2013-02-06 | 常州星宇车灯股份有限公司 | Radiating and defogging device for headlight |
EP2597356A3 (en) * | 2011-11-28 | 2015-04-29 | Automotive Lighting Reutlingen GmbH | Projection module having a rotary shade made of plastic material |
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FR3043171A1 (en) * | 2015-11-04 | 2017-05-05 | Peugeot Citroen Automobiles Sa | DIODE LIGHTING DEVICE FOR MOTOR VEHICLE |
Also Published As
Publication number | Publication date |
---|---|
EP2278218B1 (en) | 2015-02-18 |
CN101956965B (en) | 2013-12-25 |
EP2278218A3 (en) | 2012-05-23 |
DE102009033909A1 (en) | 2011-01-27 |
CN101956965A (en) | 2011-01-26 |
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