WO2007073721A1 - Headlamp with condensate trap - Google Patents

Headlamp with condensate trap Download PDF

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Publication number
WO2007073721A1
WO2007073721A1 PCT/DE2006/002261 DE2006002261W WO2007073721A1 WO 2007073721 A1 WO2007073721 A1 WO 2007073721A1 DE 2006002261 W DE2006002261 W DE 2006002261W WO 2007073721 A1 WO2007073721 A1 WO 2007073721A1
Authority
WO
WIPO (PCT)
Prior art keywords
headlight
headlamp
heat sink
air
heat
Prior art date
Application number
PCT/DE2006/002261
Other languages
German (de)
French (fr)
Inventor
Robert Apfelbeck
Veit Schwegler
Frank Tebbe
Original Assignee
Odelo Gmbh
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 Odelo Gmbh filed Critical Odelo Gmbh
Priority to EP06840874A priority Critical patent/EP1963737A1/en
Publication of WO2007073721A1 publication Critical patent/WO2007073721A1/en

Links

Classifications

    • 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]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • 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
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • 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
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • 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
    • 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
    • F21V29/90—Heating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a headlight with at least one headlight housing, with at least one arranged in the headlight source, at least one arranged in the headlight heat source and at least one, arranged in the light emission, the headlight limiting headlight glass, wherein a conveyor is arranged in the headlight, the air from the heat source along the headlight glass promotes.
  • the present invention is therefore based on the problem of developing a headlight, in which the amount of moisture in the headlight can be reduced.
  • This problem is solved with the features of the main claim.
  • a heat sink is arranged in the headlight.
  • the heat sink has a condensate drain, which connects the interior of the headlamp with the environment.
  • FIG. 1 longitudinal section through a headlight with a heat sink
  • FIG. 2 shows a longitudinal section through a headlight with an environment-controlled heat sink
  • Figure 3 longitudinal section through a headlamp with internal heat sink
  • Figure 4 longitudinal section through a headlight with two
  • FIG. 5 cross section through a heat sink according to FIG. 1;
  • FIG. 6 shows a cross section through a heat sink according to FIG. 2
  • FIG. 7 shows a cross section through a heat sink according to FIG. 4.
  • FIG. 1 shows a longitudinal section through a headlight (10), for example a motor vehicle headlight.
  • the headlamp (10) has a headlamp housing (20) in which, for example, three superimposed light sources (40) are arranged.
  • the spotlight housing (20) is closed by means of a headlight glass (30). At the same tig limits this headlight glass (30) the vehicle contour.
  • the headlight housing (20) is made of plastic, of a composite material, etc., for example. It is e.g. pot-shaped. At its open front, the headlamp housing (20) here has a mounting flange (21) on which the headlamp lens (30) consists, e.g. made of glass, plastic, etc., is attached.
  • the single headlight (10) may comprise a plurality of headlight housings (20). Also, the headlight housing (20) may be divided into several sections. The headlamp housing (20) can also have cooling elements for emitting the heat generated in the headlamp (10) into the environment (1).
  • the headlight (10) can be designed so that an exchange of air between the interior (15) and the environment (1) is possible.
  • compensation openings (14) in the rear wall (13) serve this purpose.
  • the sum of the exchange cross sections may be, for example, 100 square millimeters.
  • the headlight (10) is thus at least largely closed.
  • the individual light sources (40) are arranged in modules (100).
  • the modules (100) are used for the mutual positioning of the light source (40) and, for example, one of the respective light source (40) downstream lens (47). Instead of a single lens (47), a lens system can also be arranged here.
  • the modules (100) can be constructed in the form of a web or a frame, wherein, in the case of a frame-shaped construction, the frame has openings on one or more sides or has open side surfaces. chen has.
  • the modules (100) can be adjustable and adjustable individually or in groups, for example.
  • the single light source (40) is for example a luminescent diode (40), e.g. a light emitting diode. This is independent of their electrical components with respect to their housing form, e.g. from a light exit body (42) and a base (43).
  • the light exit body (42) has, for example, in the first approximation a hemispherical shape.
  • the height of the underlying base (43) is lower in this embodiment than the height of the light exit body (42).
  • the light emitting chip (41) is seated with respect to its geometric position e.g. in the lower region of the light exit body (42) in the vicinity of the base (43).
  • the light emitting chip (41) heated during operation of the light emitting diode (40) is at least thermally conductively connected to the circuit board (45).
  • the circuit board (45) For this purpose, e.g. around the base (43) of the LED (40) around a heat-conducting body on the board (45) arranged.
  • the light emitting chip (41) is arranged directly on the board (45), the light emitting chip (41) is electrically and thermally conductively connected to the circuit board (45).
  • the boards (45) of the individual light-emitting diodes (40) can be connected to each other at least thermally conductive. It is also conceivable to arrange a plurality of light-emitting diodes (40) on a printed circuit board (45).
  • heat sink (50) are arranged at the light emitting diodes (40) facing away from the boards (45). These comprise mutually parallel cooling fins (51) which are connected to the boards (45).
  • the individual cooling ribs (51) are interconnected by means of connecting ribs (52).
  • These connecting ribs (52) have openings (53).
  • the heat sinks (50) also have a different shape or have a different arrangement. Even with a structure of the modules (100) without a circuit board (45), the parts of the light-emitting diode (40) which are heated during operation of the light-emitting diode (40) are thermally conductively connected to the heat sinks (50), for example by means of a thermal paste.
  • the heat sink (60) comprises e.g. Condensation plate (61) with a condensate drain (64).
  • the condensation plate (61) is made, for example, of a homogeneous metallic material, e.g. made of aluminum, copper, zinc, an alloy, etc.
  • the material of the condensation plate (61) shown here has a thermal conductivity which is greater than 10 watts / (meter * Kelvin). If, for example, aluminum is used, this has a thermal conductivity of 237 W / (m * K).
  • the condensation plate (61) can also be made of a layered composite material or a coated material.
  • at least the cover layer facing the interior space (15) has a high thermal conductivity, e.g. greater than 10 W / (m * K).
  • This cover layer comprises the inner surface (62) of the condensation plate (61).
  • the remaining material layers may have a lower thermal conductivity.
  • the condensation plate (61) is, for example, a rectangular plate in plan view. Their length in this embodiment corresponds to half the length of the headlamp (10), their width, for example, 90% of the width of the headlight housing (20).
  • FIG. 5 shows a cross section of this condensation plate (61), wherein the sectional plane intersects the condensate outlet (64).
  • the here shown Asked condensation plate (61) has two outer guide surfaces (65) defining a central longitudinal groove (66).
  • the longitudinal channel (66) drops in the direction of the rear wall (13) of the headlight housing (20) and opens into the condensate drain (64).
  • the distance of the condensate drain (64) from the rear end of the condensation plate (61) is here, for example, one-tenth of the length of the condensation plate (61).
  • the fins (65) are e.g. obliquely arranged plane surfaces, which rise to the outside. These guide surfaces (65) can also have horizontal sections, they can be concave or convex, or have discontinuous surface sections.
  • the condensate drain (64) connects the interior (15) of the headlamp (10) with the environment (1). For example, it has a cross section of 75 square millimeters.
  • a check valve (69) is arranged, which opens at a pending from the interior (15) fluid pressure.
  • the condensation plate (61) described here is produced, for example, by prototyping, forming or by machining. Combinations of these production methods are conceivable.
  • the inner surface (62) is ground, for example.
  • the average roughness of this inner surface (62) is e.g. less than 6.3 microns.
  • the heat sink (60) may also be constructed differently than described.
  • the condensation plate (61) is in this embodiment with an electric cooling element (90), eg a Peltier element, connected. During operation of this electric cooling element (90), for example, a largely constant temperature of +5 degrees Celsius is generated on the inner surface (62). If the condensation plate (61) is made of a layered composite material, at least the thermally conductive inner surface (62) is connected to the electrical cooling element (90).
  • an electric cooling element eg a Peltier element
  • a fan (80) e.g. an axial fan (80) arranged.
  • Fan (80) attached to the housing (20).
  • the diameter of the fan (80) corresponds to e.g. the edge length of the heatsink (50) projected onto the floor (11).
  • the ventilator (80) shown here sucks from below through its suction opening (81).
  • the heat sink (60) is thus in the inlet of the fan (80).
  • the air outlet (82) is directed upwards, in the direction of the heat sink (50).
  • the heat generated by the light-emitting diodes (40) is conducted to the heat sinks (50).
  • the heat is released from the heat sinks (50) to the air in the interior (15) of the headlamp (10).
  • the heat sinks (50) act as heat sources (50).
  • the air temperature in the interior (15) increases - at least in the region of the heat sink (50) - up to an operating temperature. With increasing temperature and, for example, constant air pressure, the ability of the air to absorb moisture increases.
  • the fan (80) circulates the air in the interior (15) in the illustration of Figure 1 in the air conveying direction (85) in the counterclockwise direction. In this case, the air is conveyed from the air outlet (82) to the heat source (50).
  • the air flows through the heat sink (50), for example through the openings (53) - the air is heated and passed above the modules (100) to the headlamp lens (30).
  • guide means (19) are arranged for guiding the air flow.
  • the airflow hits at least approximately throughout
  • Width of the headlamp (10) on the headlight lens (30) in the upper area is directed downwards in the direction of the bottom (11).
  • the air flow is - while it flows on the inside of the headlight glass (30) along - cooled. In this case, the relative humidity of the air conveyed in the interior space (15) increases.
  • the condensation plate (61) From the air flow moisture condenses on the condensation plate (61). The condensation takes place for example as a film condensation. The absolute and the relative humidity of the headlight (10) promoted air is thereby reduced. In the case of a high amount of condensation, the condensation can also take place as dropwise condensation.
  • the inner surface (62) may be e.g. be provided with an oil film, which affects the heat conduction only slightly.
  • the condensate which is deposited on the guide surfaces (65), for example, is collected in the longitudinal channel (66) and flows into the condensate drain (64). Will the closing pressure of the Check valve (69) is exceeded, opens the check valve (69) and the condensate flows from the condensate drain (64) in the environment (1). Optionally, can be dispensed with the check valve (69).
  • the now further circulated air is reheated to the heat sinks (50) and cooled at the headlight glass (30), wherein the relative humidity of the air flow in the interior (15) increases. A portion of this moisture is then released back to the heat sink (60).
  • a separate heat source can be arranged in the headlight (10).
  • the fan (80) can also heat the circulated air.
  • the condensation plate (61) shown in FIGS. 1 and 5 has a high specific heat capacity.
  • this value is e.g. 0.888 kJ / (kg * K).
  • Variations in environmental conditions e.g. a sudden temperature jump, thus only leads to an inert reaction of the electric cooling element (90).
  • the cooling conditions in the interior (15) of the headlamp (10) are thus largely independent of the ambient conditions.
  • the condensation plate (61) may also be arranged vertically. The air flow then flows, for example, from bottom to top, while the condensate flows in the opposite direction.
  • the condensation plate may also have a convex, concave, etc. cross-section.
  • the air in the interior space (15) is, for example, during operation of the headlamp (10) to a value in a tolerance range of e.g. Cooled 2 degrees above the temperature of the heat sink (60).
  • the temperature of the heat sink (60) in the embodiment is one degree above the triple point of water at which all three phase states coexist. At temperatures below the triple point no condensation occurs. If the ambient temperature (1) is below this specific temperature, the risk of condensation on the headlight glass (30) does not increase - even if the outside temperatures continue to fall.
  • the heat sink (60) in this embodiment has a temperature which is above the freezing point of water. Thus, there is no danger that the condensate drain (64) freezes.
  • the temperature of the heat sink (60) and thus the Kondensatab- gäbe can be controlled by means of a control loop.
  • the measured variables of this control loop are the temperature and the ambient air pressure (1). These two quantities determine the maximum possible absolute moisture absorption of the air in the environment (1).
  • the headlamp (10) measures the temperature, air pressure and relative humidity. These three sizes determine the absolute humidity in the headlight (10). If necessary, can be dispensed with the determination of the air pressure. Is the absolute humidity in the headlight equal to or less than the maximum possible absolute humidity, ie the saturation humidity outside the headlight, there is no risk of condensation on the headlight glass (30). Turning on the conveyor (80) and the heat sink (60) to reduce the humidity in the interior is not required. However, the conveyor device (80) can be operated for heat removal from the heat sources (50).
  • the humidity control circuit will reduce the indoor humidity (15).
  • the conveying device (80) e.g. set to a medium flow rate.
  • the heat sink (60) is heated to a temperature, e.g. regulated in the range of the outside temperature.
  • the volume flow of the conveying device (80) can be increased or the temperature of the heat sink (60) can be reduced.
  • an additional heating in the headlight (10) may be arranged, which heats the interior (15) and thus prevents fogging of the headlight glass (30) in the short term.
  • the control loop can also be anticipatory, e.g. at a sinking outside temperature, the moisture in the headlight (10) are reduced.
  • the humidity is reduced to prevent fogging of the headlamp lens (30).
  • FIG. 2 shows a longitudinal section through a headlamp (10) with a heat sink (60), which is controlled by the environment (1).
  • the heat sink (60) is in this embodiment, a in the bottom (11) arranged condensation plate (61), which has to the interior oriented condensation ribs (67).
  • FIG. 6 shows a cross section through this condensation plate (61). The sectional plane is here, seen in the longitudinal direction of the headlamp (10), in the half of the condensation plate (61).
  • the condensation ribs (67) are, for example, on the guide surfaces (65).
  • each of the five condensation ribs (67) are arranged parallel to one another in the longitudinal direction. They have, adjacent to the fins (65), openings (71).
  • the openings (71) of the individual condensation ribs (67) are e.g. staggered against each other so as not to hinder the drainage of the condensate.
  • the shape and arrangement of the heat sink (60) can also be made as described in connection with the first embodiment.
  • the condensation plate (61) consists here of a homogeneous material and forms a thermal bridge between the interior (15) and the environment (1).
  • it is made of copper, tungsten-copper, copper-molybdenum, zinc, nickel, etc.
  • a copper condensing plate (61) has a thermal conductivity of 399 W / (m * K) and a specific heat capacity of 0.382 kJ / (kg * K).
  • the traveling wind (3) which is directed counter to the direction of travel, flows over the outer surface (63) of the condensation plate (61).
  • the condensation plate (61) assumes at least approximately the outside temperature due to its good heat conduction.
  • condensation takes place on the condensation plate (61) when the absolute humidity of the air flow is higher than the saturation air humidity at the temperature of the inner surface (62).
  • a lower temperature of the inner surface (62) quickly sets in with a sinking outside temperature due to the low specific heat capacity of the condensation plate (61) in this exemplary embodiment.
  • the condensation is enhanced. Temperature fluctuations thus immediately lead to the adaptation of the condensation rate. A fogging of the headlight glass (30) is thus prevented.
  • FIG. 3 shows a longitudinal section through a headlight with an internal heat sink (60).
  • the heat sink (60) in this embodiment is a condensation plate (61) which is mounted above the light modules (100) in the spotlight housing (20).
  • the condensate drain (64) is connected by means of a hose (68) with the environment (1).
  • the heat source (50) is also in this embodiment, a heat sink (50). This has, in order to allow a high heat dissipation, for example, three levels of connecting ribs (52) with openings (53).
  • the heat sink (60) is arranged in the inlet of the conveying device (80).
  • the latter is also in this embodiment, an axial fan (80).
  • the fan (80) the use of a centrifugal fan is conceivable - sits above the heat sink (50).
  • the air conveying direction (85) extends in this embodiment in a clockwise direction. The flow is forced, for example by means of baffles (19).
  • the air delivered by the fan (80) is passed through the heat sink (50) and heated there. It flows along the bottom (11) in the direction of the headlight glass (30). There the air rises.
  • the relative humidity of the inside (15) of the headlamp (10) promoted air increases while their temperature decreases. However, this temperature does not drop so far during the flow along the headlight glass that the humidity exceeds the saturation point.
  • condensation plate (61) On the condensation plate (61), which is held at a constant temperature, for example by means of a Peltier element (90), water condenses out of the air flow and flows through the condensate outlet (64) and the hose (68) into the environment (1).
  • a Peltier element (90) On the condensation plate (61), which is held at a constant temperature, for example by means of a Peltier element (90), water condenses out of the air flow and flows through the condensate outlet (64) and the hose (68) into the environment (1).
  • FIG. 4 shows a longitudinal section through a headlamp (10) with two partial air streams.
  • the heat sink (50) has horizontally arranged cooling fins (51).
  • the openings (53) of the connecting ribs (52) are aligned, for example, with breakthroughs of the boards (45) not shown here.
  • the fan (80) is vertical and is between the rear wall (13) of the headlamp (10) and the heat sink (50).
  • the heat sink (60), which is shown in cross section in FIG. 7, here comprises, for example, a condensation tube (72) and a collector (73) with a condensate drain (64).
  • condensation tube (72) Through the condensation tube (72), a liquid or gaseous coolant, e.g. a refrigerant to be promoted in the same or countercurrent. But also a flow with ambient air is conceivable.
  • the condensation tube (72) may also be connected to an electrical cooling element (90).
  • the condensation tube (72) may be part of a tube heat exchanger. This then has, for example, two concentric nested tubes. The in the interior (15) funded air flow is then passed, for example, through the inner tube, while the coolant flow flows through the outer tube. A design with coils is also conceivable.
  • the at the heat sink (50) heated air flow is, see. Figure 4, promoted by the interstices of the modules (100) in the direction of the headlight glass (30).
  • a part (86) of the air flow upwards is a part (86) of the air flow upwards, another part (87) deflected downward.
  • these partial air streams (86, 87) to the rear wall (13) to the suction port (81) of the fan (80) out.
  • the lower partial flow (87) covers the heat sink (60).
  • the condensed on the condensation tube (72) water flows into the collector (73) and in the condensate drain (64).
  • the condensate drain (64) then connects the interior (15) with the environment (1).
  • the heat sink (60) can be integrated into a control loop. But it can also have a set temperature value or be controlled by means of the wind (3) by heat conduction. Also in the upper partial flow (86), a heat sink (60) may be arranged. This can be carried out, for example, as shown in FIG.
  • heat sink (60) shown in FIGS. 2 and 6 can also be used in the exemplary embodiment according to FIG. Other combinations are also conceivable.
  • the length of the heat sink (60) may be greater than the length of the headlamp (10). For example, it can have horizontal and vertical areas.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention relates to a headlamp with at least one headlamp housing, with at least one light source arranged in the headlamp, with at least one heat source arranged in the headlamp and with at least one headlamp lens, arranged in the direction of light emission and delimiting the headlamp, a transporting device which transports air from the heat source along the headlamp lens being arranged in the headlamp. For this purpose, a heat sink is arranged in the headlamp. The heat sink has a condensate drain, which connects the interior space of the headlamp to the surroundings. The present invention provides a development of a headlamp with which the amount of moisture in the headlamp can be reduced.

Description

Scheinwerfer mit Kondensatabscheider Headlamp with condensate separator
Beschreibung:Description:
Die Erfindung betrifft einen Scheinwerfer mit mindestens einem Scheinwerfergehäuse, mit mindestens einer im Scheinwerfer angeordneten Lichtquelle, mit mindestens einer im Scheinwerfer angeordneten Wärmequelle und mit mindestens einem, in der Lichtabstrahlrichtung angeordneten, den Scheinwerfer begrenzenden Scheinwerferglas, wobei im Scheinwerfer eine Fördervorrichtung angeordnet ist, die Luft von der Wärmequelle am Scheinwerferglas entlang fördert.The invention relates to a headlight with at least one headlight housing, with at least one arranged in the headlight source, at least one arranged in the headlight heat source and at least one, arranged in the light emission, the headlight limiting headlight glass, wherein a conveyor is arranged in the headlight, the air from the heat source along the headlight glass promotes.
Bei niedrigen Umgebungstemperaturen besteht die Gefahr, dass in einem Scheinwerfer Feuchtigkeit am Scheinwerferglas kondensiert. Die Leuchtstärke des Scheinwerfers und damit die Sicherheit des Fahrzeuges wird beeinträchtigt.At low ambient temperatures, there is a risk of moisture condensing on the headlight glass in a headlight. The brightness of the headlamp and thus the safety of the vehicle is impaired.
Aus der nachveröffentlichten DE 10 2005 019 651 ist ein Scheinwerfer bekannt, in dem mittels eines Trocknungsmittels die Gefahr des Beschlagens vermindert wird. Die absolute Feuchtigkeitsmenge im Scheinwerfer bleibt weitgehend konstant, wobei Feuchtigkeit zwischen der Luft im Innenraum des Scheinwerfers und einem Trocknungsmittel ausgetauscht wird.From the subsequently published DE 10 2005 019 651 a headlamp is known in which by means of a drying agent the risk of fogging is reduced. The absolute amount of moisture in the headlight remains largely constant, with moisture being exchanged between the air inside the headlight and a desiccant.
Der vorliegenden Erfindung liegt daher die Problemstellung zugrunde, einen Scheinwerfer zu entwickeln, bei dem die Feuchtigkeitsmenge im Scheinwerfer reduziert werden kann. Diese Problemstellung wird mit den Merkmalen des Hauptanspruches gelöst. Dazu ist im Scheinwerfer eine Wärmesenke angeordnet. Die Wärmesenke weist eine Kondensatabführung auf, die den Innenraum des Scheinwerfers mit der Umgebung verbindet.The present invention is therefore based on the problem of developing a headlight, in which the amount of moisture in the headlight can be reduced. This problem is solved with the features of the main claim. For this purpose, a heat sink is arranged in the headlight. The heat sink has a condensate drain, which connects the interior of the headlamp with the environment.
Weitere Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung schematisch dargestellter Ausführungsformen.Further details of the invention will become apparent from the dependent claims and the following description of schematically illustrated embodiments.
Figur 1: Längsschnitt durch einen Scheinwerfer mit einer Wärmesenke; Figur 2 : Längsschnitt durch einen Scheinwerfer mit umgebungsgesteuerter Wärmesenke;Figure 1: longitudinal section through a headlight with a heat sink; FIG. 2 shows a longitudinal section through a headlight with an environment-controlled heat sink;
Figur 3 : Längsschnitt durch einen Scheinwerfer mit innenliegender Wärmesenke;Figure 3: longitudinal section through a headlamp with internal heat sink;
Figur 4: Längsschnitt durch einen Scheinwerfer mit zweiFigure 4: longitudinal section through a headlight with two
TeiHuftströmen;TeiHuftströmen;
Figur 5: Querschnitt durch eine Wärmesenke nach Figur 1;FIG. 5: cross section through a heat sink according to FIG. 1;
Figur 6: Querschnitt durch eine Wärmesenke nach Figur 2 ; Figur 7 : Querschnitt durch eine Wärmesenke nach Figur 4.FIG. 6 shows a cross section through a heat sink according to FIG. 2; FIG. 7 shows a cross section through a heat sink according to FIG. 4.
Die Figur 1 zeigt einen Längsschnitt durch einen Scheinwerfer (10), z.B. einen Kraftfahrzeugscheinwerfer. Der Scheinwer- fer (10) hat ein Scheinwerfergehäuse (20), in dem z.B. drei übereinanderliegende Lichtquellen (40) angeordnet sind. In Lichtabstrahlrichtung (5) ist das Scheinwerfergehäuse (20) mittels eines Scheinwerferglases (30) verschlossen. Gleichzei- tig begrenzt hier dieses Scheinwerferglas (30) die Fahrzeugkontur .FIG. 1 shows a longitudinal section through a headlight (10), for example a motor vehicle headlight. The headlamp (10) has a headlamp housing (20) in which, for example, three superimposed light sources (40) are arranged. In the light emission direction (5), the spotlight housing (20) is closed by means of a headlight glass (30). At the same tig limits this headlight glass (30) the vehicle contour.
Das Scheinwerfergehäuse (20) ist beispielsweise aus Kunst- stoff, aus einem Verbundwerkstoff, etc. hergestellt. Es ist z.B. topfartig ausgebildet. An seiner offenen Vorderseite hat das Scheinwerfergehäuse (20) hier einen Befestigungsflansch (21) , an dem das Scheinwerferglas (30) , dieses besteht z.B. aus Glas, Kunststoff, etc., befestigt ist.The headlight housing (20) is made of plastic, of a composite material, etc., for example. It is e.g. pot-shaped. At its open front, the headlamp housing (20) here has a mounting flange (21) on which the headlamp lens (30) consists, e.g. made of glass, plastic, etc., is attached.
Der einzelne Scheinwerfer (10) kann mehrere Scheinwerfergehäuse (20) umfassen. Auch kann das Scheinwerfergehäuse (20) in mehrere Abschnitte unterteilt sein. Das Scheinwerfergehäuse (20) kann auch Kühlelemente zur Abgabe der im Scheinwer- fer (10) erzeugten Wärme in die Umgebung (1) aufweisen.The single headlight (10) may comprise a plurality of headlight housings (20). Also, the headlight housing (20) may be divided into several sections. The headlamp housing (20) can also have cooling elements for emitting the heat generated in the headlamp (10) into the environment (1).
Der Scheinwerfer (10) kann so ausgebildet sein, dass ein Luftaustausch zwischen dem Innenraum (15) und der Umgebung (1) möglich ist. Hierzu dienen beispielsweise Ausgleichsöffnun- gen (14) in der Rückwand (13) . Die Summe der Austauschquerschnitte kann beispielsweise 100 Quadratmillimeter betragen. Der Scheinwerfer (10) ist somit zumindest weitgehend geschlossen.The headlight (10) can be designed so that an exchange of air between the interior (15) and the environment (1) is possible. For example, compensation openings (14) in the rear wall (13) serve this purpose. The sum of the exchange cross sections may be, for example, 100 square millimeters. The headlight (10) is thus at least largely closed.
Im Scheinwerfergehäuse (20) sind beispielsweise die einzelnen Lichtquellen (40) in Modulen (100) angeordnet. Die Module (100) dienen der gegenseitigen Positionierung der Lichtquelle (40) und von z.B. einer der jeweiligen Lichtquelle (40) nachgeschalteten Linse (47) . Statt einer einzelnen Linse (47) kann hier auch ein Linsensystem angeordnet sein. Die Module (100) können steg- oder rahmenförmig aufgebaut sein, wobei bei einem rahmenförmigen Aufbau der Rahmen auf einer oder auf mehreren Seiten Öffnungen aufweist oder offene Seitenflä- chen aufweist. Die Module (100) können z.B. einzeln oder gruppenweise verstell- und einstellbar sein.In the headlight housing (20), for example, the individual light sources (40) are arranged in modules (100). The modules (100) are used for the mutual positioning of the light source (40) and, for example, one of the respective light source (40) downstream lens (47). Instead of a single lens (47), a lens system can also be arranged here. The modules (100) can be constructed in the form of a web or a frame, wherein, in the case of a frame-shaped construction, the frame has openings on one or more sides or has open side surfaces. chen has. The modules (100) can be adjustable and adjustable individually or in groups, for example.
Die einzelne Lichtquelle (40) ist beispielsweise eine Lumines- zenzdiode (40), z.B. eine Leuchtdiode. Diese besteht unabhängig von ihren elektrischen Bestandteilen bezüglich ihrer Ge- häuseform z.B. aus einem Lichtaustrittskörper (42) und einem Sockel (43) . Der Lichtaustrittskörper (42) hat beispielsweise in erster Nährung eine halbkugelförmige Gestalt. Die Höhe des darunter angeordneten Sockels (43) ist in diesem Ausführungsbeispiel niedriger ist als die Höhe des Lichtaustrittskörpers (42) . Der Licht emittierende Chip (41) sitzt bezüglich seiner geometrischen Position z.B. im unteren Bereich des Lichtaustrittskörpers (42) in der Nähe des Sockels (43).The single light source (40) is for example a luminescent diode (40), e.g. a light emitting diode. This is independent of their electrical components with respect to their housing form, e.g. from a light exit body (42) and a base (43). The light exit body (42) has, for example, in the first approximation a hemispherical shape. The height of the underlying base (43) is lower in this embodiment than the height of the light exit body (42). The light emitting chip (41) is seated with respect to its geometric position e.g. in the lower region of the light exit body (42) in the vicinity of the base (43).
Die beim Betrieb der Leuchtdiode (40) erwärmte lichtemittierende Chip (41) ist zumindest thermisch leitend mit der Platine (45) verbunden. Hierfür ist z.B. um den Sockel (43) der LED (40) herum ein Wärmeleitkörper auf der Platine (45) ange- ordnet. Bei einer Leuchtdiode (40), deren lichtemittierender Chip (41) direkt auf der Platine (45) angeordnet ist, ist der lichtemittierende Chip (41) elektrisch und thermisch leitend mit der Platine (45) verbunden. Die Platinen (45) der einzelnen Leuchtdioden (40) können zumindest thermisch leitend mit- einander verbunden sein. Auch ist es denkbar, mehrere Leuchtdioden (40) auf einer Platine (45) anzuordnen.The light emitting chip (41) heated during operation of the light emitting diode (40) is at least thermally conductively connected to the circuit board (45). For this purpose, e.g. around the base (43) of the LED (40) around a heat-conducting body on the board (45) arranged. In a light emitting diode (40), the light emitting chip (41) is arranged directly on the board (45), the light emitting chip (41) is electrically and thermally conductively connected to the circuit board (45). The boards (45) of the individual light-emitting diodes (40) can be connected to each other at least thermally conductive. It is also conceivable to arrange a plurality of light-emitting diodes (40) on a printed circuit board (45).
An den den Leuchtdioden (40) abgewandten Seiten der Platinen (45) sind beispielsweise Kühlkörper (50) angeordnet. Diese umfassen hier parallel zueinander angeordnete Kühlrippen (51) , die mit der Platinen (45) verbunden sind. Die einzelnen Kühlrippen (51) sind mittels Verbindungsrippen (52) miteinander verbunden. Diese Verbindungsrippen (52) weisen Durchbrüche (53) auf. Selbstverständlich können die Kühlkörper (50) auch eine andere Gestalt haben oder eine andere Anordnung aufweisen. Auch bei einem Aufbau der Module (100) ohne Platine (45) sind die beim Betrieb der Leuchtdiode (40) erwärmten Teile der Leuchtdiode (40) thermisch leitend mit den Kühlkör- pern (50) verbunden, z.B. mittels einer Wärmeleitpaste.At the light emitting diodes (40) facing away from the boards (45), for example, heat sink (50) are arranged. These comprise mutually parallel cooling fins (51) which are connected to the boards (45). The individual cooling ribs (51) are interconnected by means of connecting ribs (52). These connecting ribs (52) have openings (53). Of course, the heat sinks (50) also have a different shape or have a different arrangement. Even with a structure of the modules (100) without a circuit board (45), the parts of the light-emitting diode (40) which are heated during operation of the light-emitting diode (40) are thermally conductively connected to the heat sinks (50), for example by means of a thermal paste.
Im Boden (11) des Scheinwerfers (10) ist eine Wärmesenke (60) angeordnet. Sie sitzt hier im Gehäuse (20) unterhalb der Module (100) und der Kühlkörper (50) . Die Wärmesenke (60) um- fasst eine z.B. Kondensationsplatte (61) mit einem Kondensatablauf (64). Die Kondensationsplatte (61) besteht beispielsweise aus einem homogenen metallischen Werkstoff, z.B. aus Aluminium, Kupfer, Zink, einer Legierung, etc. Der Werkstoff der hier dargestellten Kondensationsplatte (61) hat eine Wär- meleitfähigkeit , die größer ist als 10 Watt/ (Meter * Kelvin). Wird beispielsweise Aluminium eingesetzt, hat dieses eine Wärmeleitfähigkeit von 237 W/ (m * K).In the bottom (11) of the headlamp (10) has a heat sink (60) is arranged. It sits here in the housing (20) below the modules (100) and the heat sink (50). The heat sink (60) comprises e.g. Condensation plate (61) with a condensate drain (64). The condensation plate (61) is made, for example, of a homogeneous metallic material, e.g. made of aluminum, copper, zinc, an alloy, etc. The material of the condensation plate (61) shown here has a thermal conductivity which is greater than 10 watts / (meter * Kelvin). If, for example, aluminum is used, this has a thermal conductivity of 237 W / (m * K).
Die Kondensationsplatte (61) kann auch aus einem Schichtver- bundwerkstoff oder einem beschichteten Werkstoff hergestellt sein. Bei einer derartigen Kondensationsplatte (61) hat dann zumindest die zum Innenraum (15) zeigende Deckschicht eine hohe Wärmeleitfähigkeit, die z.B. größer ist als 10 W/ (m * K) . Diese Deckschicht umfasst die Innenfläche (62) der Kondensa- tionsplatte (61). Die restlichen Werkstoffschichten können eine niedrigere Wärmeleitfähigkeit aufweisen.The condensation plate (61) can also be made of a layered composite material or a coated material. In such a condensation plate (61), at least the cover layer facing the interior space (15) has a high thermal conductivity, e.g. greater than 10 W / (m * K). This cover layer comprises the inner surface (62) of the condensation plate (61). The remaining material layers may have a lower thermal conductivity.
Die Kondensationsplatte (61) ist beispielsweise eine in der Draufsicht rechteckige Platte. Ihre Länge entspricht in diesem Ausführungsbeispiel der Hälfte der Länge des Scheinwerfers (10), ihre Breite beispielsweise 90 % der Breite des Scheinwerfergehäuses (20) . In der Figur 5 ist ein Querschnitt dieser Kondensationsplatte (61) dargestellt, wobei die Schnittebene den Kondensatablauf (64) schneidet. Die hier dar- gestellte Kondensationsplatte (61) hat zwei außenliegenden Leitflächen (65), die eine zentrale Längsrinne (66) begrenzen.The condensation plate (61) is, for example, a rectangular plate in plan view. Their length in this embodiment corresponds to half the length of the headlamp (10), their width, for example, 90% of the width of the headlight housing (20). FIG. 5 shows a cross section of this condensation plate (61), wherein the sectional plane intersects the condensate outlet (64). The here shown Asked condensation plate (61) has two outer guide surfaces (65) defining a central longitudinal groove (66).
Die Längsrinne (66) fällt in Richtung der Rückwand (13) des Scheinwerfergehäuses (20) ab und mündet in den Kondensatablauf (64) . Der Abstand des Kondensatablaufs (64) vom rückseitigen Ende der Kondensationsplatte (61) beträgt hier beispielsweise ein Zehntel der Länge der Kondensationsplatte (61) .The longitudinal channel (66) drops in the direction of the rear wall (13) of the headlight housing (20) and opens into the condensate drain (64). The distance of the condensate drain (64) from the rear end of the condensation plate (61) is here, for example, one-tenth of the length of the condensation plate (61).
Die Leitflächen (65) sind z.B. schräg angeordnete Planflächen, die nach außen hin ansteigen. Diese Leitflächen (65) können auch horizontale Abschnitte aufweisen, sie können konkav oder konvex gewölbt sein oder unstetige Flächenabschnitte haben.The fins (65) are e.g. obliquely arranged plane surfaces, which rise to the outside. These guide surfaces (65) can also have horizontal sections, they can be concave or convex, or have discontinuous surface sections.
Der Kondensatablauf (64) verbindet den Innenraum (15) des Scheinwerfers (10) mit der Umgebung (1) . Er hat beispielsweise einen Querschnitt von 75 Quadratmillimetern. Im Kondensatablauf (64) ist beispielsweise ein Rückschlagventil (69) ange- ordnet, das bei einem vom Innenraum (15) her anstehenden Flüssigkeitsdruck öffnet.The condensate drain (64) connects the interior (15) of the headlamp (10) with the environment (1). For example, it has a cross section of 75 square millimeters. In the condensate drain (64), for example, a check valve (69) is arranged, which opens at a pending from the interior (15) fluid pressure.
Die hier beschriebene Kondensationsplatte (61) ist beispielsweise durch Urformen, Umformen oder mittels spanender Bearbei- tung hergestellt. Auch Kombinationen dieser Herstellungsverfahren sind denkbar. Die Innenfläche (62) ist beispielsweise geschliffen. Die gemittelte Rautiefe dieser Innenfläche (62) ist z.B. kleiner als 6,3 Mikrometer.The condensation plate (61) described here is produced, for example, by prototyping, forming or by machining. Combinations of these production methods are conceivable. The inner surface (62) is ground, for example. The average roughness of this inner surface (62) is e.g. less than 6.3 microns.
Die Wärmesenke (60) kann auch anders als beschrieben aufgebaut sein.The heat sink (60) may also be constructed differently than described.
Die Kondensationsplatte (61) ist in diesem Ausführungsbeispiel mit einem elektrischen Kühlelement (90), z.B. einem Peltier- element, verbunden. Beim Betrieb dieses elektrischen Kühlelements (90) wird beispielsweise an der Innenfläche (62) eine weitgehend konstante Temperatur von +5 Grad Celsius erzeugt. Ist die Kondensationsplatte (61) aus einem Schichtverbundwerk- stoff hergestellt, ist zumindest die thermisch leitende Innenfläche (62) mit dem elektrischen Kühlelement (90) verbunden.The condensation plate (61) is in this embodiment with an electric cooling element (90), eg a Peltier element, connected. During operation of this electric cooling element (90), for example, a largely constant temperature of +5 degrees Celsius is generated on the inner surface (62). If the condensation plate (61) is made of a layered composite material, at least the thermally conductive inner surface (62) is connected to the electrical cooling element (90).
Im rückwärtigen Bereich des in der Figur 1 dargestellten Scheinwerfers (10) ist ein Ventilator (80), z.B. ein Axialven- tilator (80), angeordnet. Im Ausführungsbeispiel ist dieserAt the rear of the headlamp (10) shown in Figure 1 is a fan (80), e.g. an axial fan (80) arranged. In the embodiment of this is
Ventilator (80) am Gehäuse (20) befestigt. Der Durchmesser des Ventilators (80) entspricht z.B. der Kantenlänge des auf den Boden (11) projizierten Kühlkörpers (50) . Der hier dargestellte Ventilator (80) saugt von unten her durch seine An- Säugöffnung (81) an. Die Wärmesenke (60) liegt somit im Zulauf des Ventilators (80) . Der Luftaustritt (82) ist nach oben, in Richtung der Kühlkörper (50), gerichtet.Fan (80) attached to the housing (20). The diameter of the fan (80) corresponds to e.g. the edge length of the heatsink (50) projected onto the floor (11). The ventilator (80) shown here sucks from below through its suction opening (81). The heat sink (60) is thus in the inlet of the fan (80). The air outlet (82) is directed upwards, in the direction of the heat sink (50).
Beim Betrieb des Scheinwerfers (10) wird die von den Leuchtdioden (40) erzeugte Wärme an die Kühlkörper (50) geleitet. Die Wärme wird von den Kühlkörpern (50) an die Luft im Innenraum (15) des Scheinwerfers (10) abgegeben. Die Kühlkörper (50) wirken hierbei als Wärmequellen (50) . Die Lufttempe- ratur im Innenraum (15) nimmt - zumindest im Bereich der Kühlkörper (50) - bis zu einer Betriebstemperatur zu. Mit zunehmender Temperatur und beispielsweise konstantem Luftdruck steigt die Fähigkeit der Luft, Feuchtigkeit aufzunehmen. Der Ventilator (80) wälzt die Luft im Innenraum (15) in der Dar- Stellung der Figur 1 in der Luftförderrichtung (85) entgegen des Uhrzeigersinnes um. Hierbei wird die Luft vom Luftaustritt (82) zur Wärmequelle (50) gefördert. An der Wärmequelle (50) - die Luft durchströmt die Kühlkörper (50) beispielsweise durch die Durchbrüche (53) - wird die Luft erhitzt und oberhalb der Module (100) zum Scheinwerferglas (30) geleitet. Im Scheinwerfer (10) sind beispielsweise Leiteinrichtungen (19) zur Lenkung des Luftstromes angeordnet.During operation of the headlamp (10), the heat generated by the light-emitting diodes (40) is conducted to the heat sinks (50). The heat is released from the heat sinks (50) to the air in the interior (15) of the headlamp (10). The heat sinks (50) act as heat sources (50). The air temperature in the interior (15) increases - at least in the region of the heat sink (50) - up to an operating temperature. With increasing temperature and, for example, constant air pressure, the ability of the air to absorb moisture increases. The fan (80) circulates the air in the interior (15) in the illustration of Figure 1 in the air conveying direction (85) in the counterclockwise direction. In this case, the air is conveyed from the air outlet (82) to the heat source (50). At the heat source (50) - the air flows through the heat sink (50), for example through the openings (53) - the air is heated and passed above the modules (100) to the headlamp lens (30). In the headlight (10), for example, guide means (19) are arranged for guiding the air flow.
Der Luftstrom trifft zumindest annähernd in der gesamtenThe airflow hits at least approximately throughout
Breite des Scheinwerfers (10) auf das Scheinwerferglas (30) im oberen Bereich auf. Am Scheinwerferglas (30) entlang wird der Luftstrom nach unten in Richtung des Bodens (11) geführt.Width of the headlamp (10) on the headlight lens (30) in the upper area. Along the headlight glass (30) along the air flow is directed downwards in the direction of the bottom (11).
Ist die Temperatur in der Umgebung (1) , also außerhalb des Scheinwerfers (10), niedriger als die Temperatur des Luftstroms im Innenraum (15) , wird der Luftstrom - während er an der Innenseite des Scheinwerferglases (30) entlang strömt - abgekühlt. Hierbei nimmt die relative Feuchtigkeit der im In- nenraum (15) geförderten Luft zu.If the temperature in the environment (1), that is outside the headlight (10), lower than the temperature of the air flow in the interior (15), the air flow is - while it flows on the inside of the headlight glass (30) along - cooled. In this case, the relative humidity of the air conveyed in the interior space (15) increases.
Am Boden (11) wird der Luftstrom entlang der Innenfläche (62) der Kondensationsplatte (61) geführt. Hierbei wird der Randbereich des Luftstroms abgekühlt. Die relative Luftfeuchtigkeit - zumindest im Randbereich des Luftstroms - übersteigt dieAt the bottom (11) of the air flow along the inner surface (62) of the condensation plate (61) is guided. In this case, the edge region of the air flow is cooled. The relative humidity - at least in the edge area of the air flow - exceeds the
Sättigungsgrenze, die von der Temperatur und dem Druck abhängig ist. Aus dem Luftstrom kondensiert Feuchtigkeit an der Kondensationsplatte (61) . Die Kondensation erfolgt beispielsweise als Filmkondensation. Der absolute und der relative Feuchtigkeitsgehalt der im Scheinwerfer (10) geförderten Luft wird dabei verringert. Bei einem hohen Kondensatanfall kann die Kondensation auch als Tropfenkondensation erfolgen. Zur Verstärkung dieses Effekts kann die Innenfläche (62) z.B. mit einem Ölfilm versehen sein, der die Wärmeleitung nur geringfü- gig beeinträchtigt.Saturation limit, which depends on temperature and pressure. From the air flow moisture condenses on the condensation plate (61). The condensation takes place for example as a film condensation. The absolute and the relative humidity of the headlight (10) promoted air is thereby reduced. In the case of a high amount of condensation, the condensation can also take place as dropwise condensation. To enhance this effect, the inner surface (62) may be e.g. be provided with an oil film, which affects the heat conduction only slightly.
Das Kondensat, das beispielsweise auf den Leitflächen (65) abgeschieden wird, wird in der Längsrinne (66) gesammelt und fließt in den Kondensatablauf (64) . Wird der Schließdruck des Rückschlagventils (69) überschritten, öffnet das Rückschlagventil (69) und das Kondensat fließt aus dem Konden- satablauf (64) in die Umgebung (1) . Gegebenenfalls kann auf das Rückschlagventil (69) verzichtet werden.The condensate, which is deposited on the guide surfaces (65), for example, is collected in the longitudinal channel (66) and flows into the condensate drain (64). Will the closing pressure of the Check valve (69) is exceeded, opens the check valve (69) and the condensate flows from the condensate drain (64) in the environment (1). Optionally, can be dispensed with the check valve (69).
Die nun weiter umgewälzte Luft wird an den Kühlkörpern (50) wieder erwärmt und am Scheinwerferglas (30) abgekühlt, wobei die relative Luftfeuchtigkeit des Luftstroms im Innenraum (15) zunimmt. Ein Teil dieser Feuchtigkeit wird dann wieder an der Wärmesenke (60) abgegeben.The now further circulated air is reheated to the heat sinks (50) and cooled at the headlight glass (30), wherein the relative humidity of the air flow in the interior (15) increases. A portion of this moisture is then released back to the heat sink (60).
Gegebenenfalls kann im Scheinwerfer (10) eine separate Wärmequelle angeordnet sein. Beispielsweise kann auch der Ventilator (80) die umgewälzte Luft aufheizen.Optionally, a separate heat source can be arranged in the headlight (10). For example, the fan (80) can also heat the circulated air.
Die in den Figuren 1 und 5 dargestellte Kondensationsplatte (61) hat beispielsweise eine hohe spezifische Wärmekapazität. Bei einer Kondensationsplatte (61) aus Aluminium beträgt dieser Wert z.B. 0,888 kJ/ (kg * K) . Schwankungen der Um- gebungsbedingungen, z.B. ein plötzlicher TemperaturSprung, führt somit nur zu einer trägen Reaktion des elektrischen Kühlelements (90). Die Kühlbedingungen im Innenraum (15) des Scheinwerfers (10) sind somit weitgehend unabhängig von den Umgebungsbedingungen .For example, the condensation plate (61) shown in FIGS. 1 and 5 has a high specific heat capacity. For an aluminum condensation plate (61), this value is e.g. 0.888 kJ / (kg * K). Variations in environmental conditions, e.g. a sudden temperature jump, thus only leads to an inert reaction of the electric cooling element (90). The cooling conditions in the interior (15) of the headlamp (10) are thus largely independent of the ambient conditions.
Gegebenenfalls kann zumindest der - von der Luftströmung aus gesehene - Anfangsbereich der Innenfläche (62) einen höheren als den angegebenen Wert der mittleren Rautiefe aufweisen. Im Luftstrom wird damit der turbulente Anteil gegenüber dem lami- naren Anteil verstärkt. Der sich aufbauende Kondensatfilm kann hierbei verstärkt werden. Hierbei ist jedoch die Kondensationsrate so zu begrenzen, dass der sich aufbauende Kondensatfilm nicht isolierend wirkt. Die Kondensationsplatte (61) kann auch vertikal angeordnet sein. Der Luftstrom strömt dann beispielsweise von unten nach oben, während das Kondensat in der Gegenrichtung abfließt. Die Kondensationsplatte kann auch einen konvexen, konkaven etc. Querschnitt haben.Optionally, at least the - seen from the air flow - initial range of the inner surface (62) have a higher than the specified value of the average surface roughness. In the air stream, the turbulent fraction is thus increased compared to the laminar fraction. The building up condensate film can be reinforced here. In this case, however, the condensation rate is to be limited so that the constituent condensate film does not have an insulating effect. The condensation plate (61) may also be arranged vertically. The air flow then flows, for example, from bottom to top, while the condensate flows in the opposite direction. The condensation plate may also have a convex, concave, etc. cross-section.
Die Luft im Innenraum (15) wird bei längerem Betrieb des Scheinwerfers (10) beispielsweise auf einen Wert in einem Toleranzbereich von z.B. 2 Grad oberhalb der Temperatur der Wär- mesenke (60) abgekühlt. Die Temperatur der Wärmesenke (60) liegt im Ausführungsbeispiel ein Grad über dem Tripelpunkt von Wasser, bei dem alle drei Phasenzustände koexistieren. Bei Temperaturen unterhalb des Tripelpunktes erfolgt keine Kondensation. Liegt die Temperatur der Umgebung (1) unterhalb dieser spezifischen Temperatur, steigt - selbst bei weiter sinkenden Außentemperaturen - die Gefahr der Kondensation am Scheinwerferglas (30) nicht weiter an.The air in the interior space (15) is, for example, during operation of the headlamp (10) to a value in a tolerance range of e.g. Cooled 2 degrees above the temperature of the heat sink (60). The temperature of the heat sink (60) in the embodiment is one degree above the triple point of water at which all three phase states coexist. At temperatures below the triple point no condensation occurs. If the ambient temperature (1) is below this specific temperature, the risk of condensation on the headlight glass (30) does not increase - even if the outside temperatures continue to fall.
Die Wärmesenke (60) hat in diesem Ausführungsbeispiel eine Temperatur, die oberhalb des Gefrierpunktes von Wasser liegt. Somit besteht keine Gefahr, dass der Kondensatablauf (64) zufriert .The heat sink (60) in this embodiment has a temperature which is above the freezing point of water. Thus, there is no danger that the condensate drain (64) freezes.
Die Temperatur der Wärmesenke (60) und damit die Kondensatab- gäbe kann mittels eines Regelkreises geregelt werden. Die Messgrößen dieses Regelkreises sind die Temperatur und der Luftdruck der Umgebung (1) . Diese beiden Größen bestimmen die maximal mögliche absolute Feuchtigkeitsaufnahme der Luft in der Umgebung (1) . Im Scheinwerfer (10) wird die Temperatur, der Luftdruck und die relative Feuchtigkeit gemessen. Diese drei Größen bestimmen die absolute Luftfeuchtigkeit im Scheinwerfer (10) . Gegebenenfalls kann auf die Ermittlung des Luftdrucks verzichtet werden. Ist die absolute Luftfeuchtigkeit im Scheinwerfer gleich oder geringer als die maximale mögliche absolute Luftfeuchtigkeit, also die Sättigungsluftfeuchtigkeit außerhalb des Scheinwerfers, besteht keine Gefahr der Kondensation am Scheinwerferglas (30) . Ein Einschalten der Fördervorrichtung (80) und der Wärmesenke (60) zur Verminderung der Luftfeuchtigkeit im Innenraum ist nicht erforderlich. Die Fördervorrichtung (80) kann jedoch zur Wärmeabfuhr aus den Wärmequellen (50) betrieben werden.The temperature of the heat sink (60) and thus the Kondensatab- gäbe can be controlled by means of a control loop. The measured variables of this control loop are the temperature and the ambient air pressure (1). These two quantities determine the maximum possible absolute moisture absorption of the air in the environment (1). The headlamp (10) measures the temperature, air pressure and relative humidity. These three sizes determine the absolute humidity in the headlight (10). If necessary, can be dispensed with the determination of the air pressure. Is the absolute humidity in the headlight equal to or less than the maximum possible absolute humidity, ie the saturation humidity outside the headlight, there is no risk of condensation on the headlight glass (30). Turning on the conveyor (80) and the heat sink (60) to reduce the humidity in the interior is not required. However, the conveyor device (80) can be operated for heat removal from the heat sources (50).
Ist die absolute Luftfeuchtigkeit im Scheinwerfer höher als die absolute Sättigungsfeuchtigkeit der Luft in der Umgebung (1) , bewirkt der Feuchtigkeitsregelkreis eine Verminderung der Luftfeuchtigkeit im Innenraum (15). Hierzu wird zunächst die Fördervorrichtung (80) z.B. auf einen mittleren Förderstrom eingestellt. Außerdem wird die Wärmesenke (60) auf eine Temperatur z.B. im Bereich der Außentemperatur geregelt.If the absolute humidity in the headlamp is higher than the absolute saturation humidity of the ambient air (1), the humidity control circuit will reduce the indoor humidity (15). For this purpose, first the conveying device (80), e.g. set to a medium flow rate. In addition, the heat sink (60) is heated to a temperature, e.g. regulated in the range of the outside temperature.
Soll eine hohe Feuchtigkeitsmenge abgeführt werden, kann beispielsweise der Volumenstrom der Fördervorrichtung (80) verstärkt werden oder die Temperatur der Wärmesenke (60) vermin- dert werden. Gegebenenfalls kann eine Zusatzheizung im Scheinwerfer (10) angeordnet sein, die den Innenraum (15) erhitzt und so kurzfristig ein Beschlagen des Scheinwerferglases (30) verhindert. Mittels des Regelkreises kann auch vorausschauend z.B. bei einer absinkenden Außentemperatur die Feuchtigkeit im Scheinwerfer (10) vermindert werden. Auch kann beispielsweise bei abnehmender Helligkeit, z.B. bei einer Einfahrt in einen Tunnel, die Luftfeuchtigkeit vermindert werden, um das Beschlagen des Scheinwerferglases (30) zu verhindern.If a high amount of moisture is to be removed, for example, the volume flow of the conveying device (80) can be increased or the temperature of the heat sink (60) can be reduced. Optionally, an additional heating in the headlight (10) may be arranged, which heats the interior (15) and thus prevents fogging of the headlight glass (30) in the short term. By means of the control loop can also be anticipatory, e.g. at a sinking outside temperature, the moisture in the headlight (10) are reduced. Also, for example, as the brightness decreases, e.g. when entering a tunnel, the humidity is reduced to prevent fogging of the headlamp lens (30).
Die Figur 2 zeigt einen Längsschnitt durch einen Scheinwerfer (10) mit einer Wärmesenke (60) , die durch die Umgebung (1) gesteuert wird. Die Wärmesenke (60) ist in diesem Ausführungsbeispiel eine im Boden (11) angeordnete Kondensations- platte (61), die zum Innenraum hin orientierte Kondensationsrippen (67) hat. In der Figur 6 ist ein Querschnitt durch diese Kondensationsplatte (61) dargestellt. Die Schnittebene liegt hier, in Längsrichtung des Scheinwerfers (10) gesehen, in der Hälfte der Kondensationsplatte (61) .Figure 2 shows a longitudinal section through a headlamp (10) with a heat sink (60), which is controlled by the environment (1). The heat sink (60) is in this embodiment, a in the bottom (11) arranged condensation plate (61), which has to the interior oriented condensation ribs (67). FIG. 6 shows a cross section through this condensation plate (61). The sectional plane is here, seen in the longitudinal direction of the headlamp (10), in the half of the condensation plate (61).
Die Kondensationsrippen (67) stehen beispielsweise auf den Leitflächen (65). Die jeweils beispielsweise fünf Kondensationsrippen (67) sind in Längsrichtung parallel zueinander ange- ordnet. Sie haben, angrenzend zu den Leitflächen (65), Durchbrüche (71) . Die Durchbrüche (71) der einzelnen Kondensationsrippen (67) sind z.B. gegeneinander versetzt angeordnet, um den Ablauf des Kondensats nicht zu behindern.The condensation ribs (67) are, for example, on the guide surfaces (65). For example, each of the five condensation ribs (67) are arranged parallel to one another in the longitudinal direction. They have, adjacent to the fins (65), openings (71). The openings (71) of the individual condensation ribs (67) are e.g. staggered against each other so as not to hinder the drainage of the condensate.
Die Gestalt und die Anordnung der Wärmesenke (60) kann auch so ausgeführt sein, wie im Zusammenhang mit dem ersten Ausführungsbeispiel beschrieben.The shape and arrangement of the heat sink (60) can also be made as described in connection with the first embodiment.
Die Kondensationsplatte (61) besteht hier aus einem homogenen Werkstoff und bildet eine Wärmebrücke zwischen dem Innenraum (15) und der Umgebung (1) . Beispielsweise ist sie aus Kupfer, Wolfram-Kupfer, Kupfer-Molybdän, Zink, Nickel, etc. gefertigt. Eine Kondensationsplatte (61) aus Kupfer hat beispielsweise eine thermische Leitfähigkeit von 399 W/ (m * K) und eine spezifische Wärmekapazität von 0,382 kJ/ (kg * K).The condensation plate (61) consists here of a homogeneous material and forms a thermal bridge between the interior (15) and the environment (1). For example, it is made of copper, tungsten-copper, copper-molybdenum, zinc, nickel, etc. For example, a copper condensing plate (61) has a thermal conductivity of 399 W / (m * K) and a specific heat capacity of 0.382 kJ / (kg * K).
Beim Betrieb des Fahrzeugs strömt der - der Fahrtrichtung entgegengerichtete - Fahrtwind (3) über die Außenfläche (63) der Kondensationsplatte (61). Die Kondensationsplatte (61) nimmt aufgrund ihrer guten Wärmeleitung zumindest annährend die Außentemperatur an. Im Innenraum (15) des Scheinwerfers (10) erfolgt Kondensation an der Kondensationsplatte (61) , wenn die absolute Feuchtigkeit des Luftstroms höher ist als die Sätti- gungsluftfeuchte bei der Temperatur der Innenfläche (62). Fährt das Fahrzeug beispielsweise in einen Tunnel oder in eine Tiefgarage, stellt sich bei absinkender Außentemperatur aufgrund der niedrigen spezifischen Wärmekapazität der Kondensa- tionsplatte (61) in diesem Ausführungsbeispiel schnell eine niedrigere Temperatur der Innenfläche (62) ein. Die Kondensation wird verstärkt. TemperaturSchwankungen führen somit sofort zur Anpassung der Kondensationsrate. Ein Beschlagen des Scheinwerferglases (30) wird somit verhindert.During operation of the vehicle, the traveling wind (3), which is directed counter to the direction of travel, flows over the outer surface (63) of the condensation plate (61). The condensation plate (61) assumes at least approximately the outside temperature due to its good heat conduction. In the interior (15) of the headlight (10) condensation takes place on the condensation plate (61) when the absolute humidity of the air flow is higher than the saturation air humidity at the temperature of the inner surface (62). If the vehicle is traveling, for example, in a tunnel or in an underground car park, a lower temperature of the inner surface (62) quickly sets in with a sinking outside temperature due to the low specific heat capacity of the condensation plate (61) in this exemplary embodiment. The condensation is enhanced. Temperature fluctuations thus immediately lead to the adaptation of the condensation rate. A fogging of the headlight glass (30) is thus prevented.
Bei extrem niedrigen Temperaturen verhindert gegebenenfalls eine Zusatzheizung ein Einfrieren des Kondensatabflusses (64).At extremely low temperatures, additional heating may prevent the condensate drain from freezing (64).
In der Figur 3 ist ein Längsschnitt durch einen Scheinwerfer mit einer innenliegenden Wärmesenke (60) dargestellt.FIG. 3 shows a longitudinal section through a headlight with an internal heat sink (60).
Die Wärmesenke (60) ist in diesem Ausführungsbeispiel eine Kondensationsplatte (61), die oberhalb der Lichtmodule (100) im Scheinwerfergehäuse (20) befestigt ist. Der Kondensatablauf (64) ist mittels eines Schlauches (68) mit der Umgebung (1) verbunden .The heat sink (60) in this embodiment is a condensation plate (61) which is mounted above the light modules (100) in the spotlight housing (20). The condensate drain (64) is connected by means of a hose (68) with the environment (1).
Die Wärmequelle (50) ist auch in diesem Ausführungsbeispiel ein Kühlkörper (50) . Dieser hat, um eine hohe Wärmeabfuhr zu ermöglichen, beispielsweise drei Ebenen von Verbindungsrippen (52) mit Durchbrüchen (53) .The heat source (50) is also in this embodiment, a heat sink (50). This has, in order to allow a high heat dissipation, for example, three levels of connecting ribs (52) with openings (53).
Die Wärmesenke (60) ist im Zulauf der Fördervorrichtung (80) angeordnet. Letztere ist auch in diesem Ausführungsbeispiel ein Axialventilator (80) . Der Ventilator (80) - auch der Einsatz eines Radialventilators ist denkbar - sitzt oberhalb des Kühlkörpers (50) . Die Luftförderrichtung (85) verläuft in diesem Ausführungsbeispiel im Uhrzeigersinn. Der Förderstrom wird beispielsweise mittels Leitblechen (19) zwangsgeführt.The heat sink (60) is arranged in the inlet of the conveying device (80). The latter is also in this embodiment, an axial fan (80). The fan (80) - the use of a centrifugal fan is conceivable - sits above the heat sink (50). The air conveying direction (85) extends in this embodiment in a clockwise direction. The flow is forced, for example by means of baffles (19).
Die vom Ventilator (80) geförderte Luft wird durch den Kühlkörper (50) geleitet und dort aufgeheizt. Sie strömt entlang des Bodens (11) in Richtung des Scheinwerferglases (30) . Dort steigt die Luft nach oben. Die z.B. während der Fahrt auf der Außenseite (31) des Scheinwerferglases entlangströmende Luft- Strömung (4) kühlt den Luftstrom, der im Scheinwerfer (10) umgewälzt wird, ab. Hierbei steigt die relative Luftfeuchtigkeit der im Innenraum (15) des Scheinwerfers (10) geförderten Luft an, während ihre Temperatur abnimmt. Diese Temperatur sinkt aber während des Entlangströmens am Scheinwerferglas nicht so weit ab, dass die Luftfeuchtigkeit den Sättigungspunkt überschreitet .The air delivered by the fan (80) is passed through the heat sink (50) and heated there. It flows along the bottom (11) in the direction of the headlight glass (30). There the air rises. The e.g. while traveling on the outside (31) of the headlight glass along flowing air flow (4) cools the air flow, which is circulated in the headlight (10), from. Here, the relative humidity of the inside (15) of the headlamp (10) promoted air increases while their temperature decreases. However, this temperature does not drop so far during the flow along the headlight glass that the humidity exceeds the saturation point.
An der Kondensationsplatte (61), diese wird beispielsweise mittels eines Peltierelements (90) auf einer konstanten Tempe- ratur gehalten, kondensiert Wasser aus dem Luftstrom und fließt durch den Kondensatablauf (64) und den Schlauch (68) in die Umgebung (1) .On the condensation plate (61), which is held at a constant temperature, for example by means of a Peltier element (90), water condenses out of the air flow and flows through the condensate outlet (64) and the hose (68) into the environment (1).
Die Figur 4 zeigt einen Längsschnitt durch einen Scheinwerfer (10) mit zwei Teilluftströmen. Der Kühlkörper (50) hat waagerecht angeordnete Kühlrippen (51). Die Durchbrüche (53) der Verbindungsrippen (52) fluchten beispielsweise mit hier nicht näher dargestellten Durchbrüchen der Platinen (45) . Der Ventilator (80) steht senkrecht und ist zwischen der Rückwand (13) des Scheinwerfers (10) und dem Kühlkörper (50) .FIG. 4 shows a longitudinal section through a headlamp (10) with two partial air streams. The heat sink (50) has horizontally arranged cooling fins (51). The openings (53) of the connecting ribs (52) are aligned, for example, with breakthroughs of the boards (45) not shown here. The fan (80) is vertical and is between the rear wall (13) of the headlamp (10) and the heat sink (50).
Die Wärmesenke (60) , sie ist im Querschnitt in der Figur 7 dargestellt, umfasst hier beispielsweise ein Kondensations- röhr (72) und einen Sammler (73) mit einem Kondensatablauf (64) .The heat sink (60), which is shown in cross section in FIG. 7, here comprises, for example, a condensation tube (72) and a collector (73) with a condensate drain (64).
Durch das Kondensationsrohr (72) hindurch kann ein flüssiges oder gasförmiges Kühlmittel, z.B. ein Kältemittel, im Gleichoder Gegenstrom gefördert werden. Aber auch ein Durchströmen mit Umgebungsluft ist denkbar. Das Kondensationsrohr (72) kann auch an ein elektrisches Kühlelement (90) angeschlossen sein.Through the condensation tube (72), a liquid or gaseous coolant, e.g. a refrigerant to be promoted in the same or countercurrent. But also a flow with ambient air is conceivable. The condensation tube (72) may also be connected to an electrical cooling element (90).
Das Kondensationsrohr (72) kann Teil eines Röhrenwärmetauschers sein. Dieser hat dann beispielsweise zwei konzentrisch ineinanderliegenden Rohre. Der im Innenraum (15) geförderte Luftstrom wird dann beispielsweise durch das Innenrohr geleitet, während der Kühlmittelstrom durch das Außenrohr strömt. Auch eine Ausführung mit Rohrschlangen ist denkbar.The condensation tube (72) may be part of a tube heat exchanger. This then has, for example, two concentric nested tubes. The in the interior (15) funded air flow is then passed, for example, through the inner tube, while the coolant flow flows through the outer tube. A design with coils is also conceivable.
Der am Kühlkörper (50) erwärmte Luftstrom wird, vgl. Figur 4, durch die Zwischenräume der Module (100) in Richtung des Scheinwerferglases (30) gefördert. Hier wird ein Teil (86) des Luftstromes nach oben, ein weiterer Teil (87) nach unten abgelenkt. Entlang der Innenwandung des Scheinwerfers (10) werden diese Teilluftströme (86, 87) an die Rückwand (13) zur Ansaugöffnung (81) des Ventilators (80) geführt.The at the heat sink (50) heated air flow is, see. Figure 4, promoted by the interstices of the modules (100) in the direction of the headlight glass (30). Here is a part (86) of the air flow upwards, another part (87) deflected downward. Along the inner wall of the headlamp (10) these partial air streams (86, 87) to the rear wall (13) to the suction port (81) of the fan (80) out.
Im Ausführungsbeispiel der Figur 4 überstreicht der untere Teilstrom (87) die Wärmesenke (60) . Das am Kondensationsrohr (72) kondensierte Wasser fließt in den Sammler (73) und in den Kondensatablauf (64) . Der Kondensatablauf (64) verbindet dann das Innenraum (15) mit der Umgebung (1) .In the embodiment of Figure 4, the lower partial flow (87) covers the heat sink (60). The condensed on the condensation tube (72) water flows into the collector (73) and in the condensate drain (64). The condensate drain (64) then connects the interior (15) with the environment (1).
Auch in diesem Ausführungsbeispiel kann die Wärmesenke (60) in einen Regelkreis eingebunden sein. Sie kann aber auch einen fest eingestellten Temperaturwert haben oder mittels des Fahrtwindes (3) durch Wärmekonduktion gesteuert werden. Auch im oberen Teilstrom (86) kann eine Wärmesenke (60) angeordnet sein. Diese kann beispielsweise wie in der Figur 3 dargestellt ausgeführt sein.Also in this embodiment, the heat sink (60) can be integrated into a control loop. But it can also have a set temperature value or be controlled by means of the wind (3) by heat conduction. Also In the upper partial flow (86), a heat sink (60) may be arranged. This can be carried out, for example, as shown in FIG.
Die in den einzelnen Ausführungsbeispielen dargestellten Komponenten können auch mit den anderen Ausführungsbeispielen kombiniert werden. So kann beispielsweise die in den Figuren 2 und 6 dargestellte Wärmesenke (60) auch in dem Ausführungsbeispiel nach Figur 1 eingesetzt werden. Auch andere Kombinatio- nen sind denkbar.The components shown in the individual embodiments can also be combined with the other embodiments. For example, the heat sink (60) shown in FIGS. 2 and 6 can also be used in the exemplary embodiment according to FIG. Other combinations are also conceivable.
Die Länge der Wärmesenke (60) kann größer sein als die Länge des Scheinwerfers (10) . Sie kann beispielsweise horizontale und vertikale Bereiche aufweisen. The length of the heat sink (60) may be greater than the length of the headlamp (10). For example, it can have horizontal and vertical areas.
Bezugszeichenliste :List of reference numbers:
1 Umgebung, Luft1 environment, air
3 Fahrtwind3 wind
4 Luftströmung entlang (31)4 air flow along (31)
5 Lichtabstrahlrichtung5 light emission direction
10 Scheinwerfer10 headlights
11 Boden11 floor
12 Dach12 roof
13 Rückwand13 rear wall
14 Ausgleichsöffnungen14 compensation holes
15 Innenraum15 interior
19 Leitbleche19 baffles
20 Scheinwerfergehäuse20 spotlight housing
21 Befestigungsflansch21 mounting flange
30 Scheinwerferglas30 headlight glass
31 Außenseite31 outside
40 Lichtquelle, Lumineszenzc40 light source, Lumineszenzc
41 Lichtemittierender Chip41 light-emitting chip
42 Lichtaustrittskörper42 light exit body
43 Sockel43 sockets
45 Platinen45 boards
47 Linse47 lens
50 Wärmequelle, Kühlkörper50 heat source, heat sink
51 Kühlrippen51 cooling fins
52 Verbindungsrippen 53 Durchbrüche52 connecting ribs 53 breakthroughs
60 Wärmesenke60 heat sink
61 Kondensationsplatte61 condensation plate
62 Innenfläche62 inner surface
63 Außenfläche, Unterseite63 outer surface, underside
64 Kondensatablauf , Kondensatabführung64 Condensate drain, condensate drain
65 Leitflächen65 fins
66 Längsrinne66 longitudinal gutter
67 Kondensationsrippen67 condensation ribs
68 Schlauch68 hose
69 Rückschlagventil69 Check valve
71 Durchbrüche71 breakthroughs
72 Kondensationsrohr72 condensation tube
73 Sammler73 collectors
80 Fördervorrichtung, Ventilator, Axia80 conveyor, fan, Axia
81 Ansaugöffnung81 suction opening
82 Luftaustritt82 air outlet
85 Luftförderrichtung85 air conveying direction
86 Teilluftström86 partial air flow
87 Teilluftstrom87 partial air flow
90 elektrisches Kühlelement, Peltierel90 electric cooling element, Peltierel
00 Module 00 modules

Claims

Patentansprüche: claims:
1. Scheinwerfer mit mindestens einem Scheinwerfergehäuse, mit mindestens einer im Scheinwerfer angeordneten Lichtquelle, mit mindestens einer im Scheinwerfer angeordneten Wärmequelle und mit mindestens einem, in der Lichtabstrahlrichtung angeordneten, den Scheinwerfer begrenzenden Scheinwerferglas, wobei im Scheinwerfer eine Fördervorrichtung angeordnet ist, die Luft von der Wärmequelle am Scheinwerferglas entlang fördert, da- durch gekennzeichnet, dass im Scheinwerfer (10) eine Wärmesenke (60) angeordnet ist, und dass die Wärmesenke (60) eine Kondensatabführung (64) aufweist, die den Innenraum (15) des Scheinwerfers (10) mit der Umgebung (1) verbindet.1. Headlamp with at least one headlamp housing, with at least one light source arranged in the headlight, arranged with at least one arranged in the light emission direction, the headlight limiting headlight glass, wherein the headlight, a conveyor device is arranged, the air from the Heat source along the headlight glass promotes, characterized in that in the headlight (10) has a heat sink (60) is arranged, and that the heat sink (60) has a condensate discharge (64), the interior (15) of the headlamp (10) with the environment (1) connects.
2. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass die Wärmesenke (60) im Zulauf der Fördervorrichtung (80) ange- ordnet ist.2. Headlight according to claim 1, characterized in that the heat sink (60) in the inlet of the conveying device (80) is arranged.
3. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass er zumindest weitgehend geschlossen ist.3. Headlight according to claim 1, characterized in that it is at least largely closed.
4. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass die Temperatur der Wärmesenke (60) mittels eines elektrischen Kühlelements (90) gesteuert ist. 4. Headlight according to claim 1, characterized in that the temperature of the heat sink (60) by means of an electric cooling element (90) is controlled.
5. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass die Wärmesenke (60) eine den Scheinwerfer (10) begrenzende Kondensationsplatte (61) umfasst, dessen dem Innenraum (15) zugewandte Innenfläche (62) eine thermische Leitfähigkeit aufweist, die größer ist als 10 W/ (m * K) .5. Headlight according to claim 1, characterized in that the heat sink (60) comprises a headlight (10) limiting condensation plate (61) whose interior (15) facing the inner surface (62) has a thermal conductivity greater than 10 W / (m * K).
6. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass mindestens eine Lichtquelle (40) eine Lumineszenzdiode (40) ist .6. Headlight according to claim 1, characterized in that at least one light source (40) is a light-emitting diode (40).
7. Scheinwerfer nach Anspruch 6, dadurch gekennzeichnet, dass die Lumineszenzdiode (40) einen lichtemittierenden Chip (41) umfasst, der thermisch leitend mit einem Kühlkörper (50) verbunden ist.7. Headlight according to claim 6, characterized in that the light-emitting diode (40) comprises a light-emitting chip (41) which is thermally conductively connected to a heat sink (50).
8. Scheinwerfer nach Anspruch 7, dadurch gekennzeichnet, dass der Kühlkörper (50) eine Wärmequelle (50) ist.8. Headlight according to claim 7, characterized in that the cooling body (50) is a heat source (50).
9. Scheinwerfer nach Anspruch 1, dadurch gekennzeichnet, dass die Fördervorrichtung (80) einen Ventilator (80) umfasst. 9. Headlight according to claim 1, characterized in that the conveying device (80) comprises a fan (80).
PCT/DE2006/002261 2005-12-16 2006-12-15 Headlamp with condensate trap WO2007073721A1 (en)

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DE102005060736A DE102005060736B4 (en) 2005-12-16 2005-12-16 Headlamp with condensate separator
DE102005060736.5 2005-12-16

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DE102005060736B4 (en) 2008-11-20

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