CN201277526Y

CN201277526Y - Cooling device for vehicle headlight white light LED

Info

Publication number: CN201277526Y
Application number: CNU2008201619536U
Authority: CN
Inventors: 李朝晖; 李建清; 冯华云
Original assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Current assignee: Changzhou Xingyu Automotive Lighting Systems Co Ltd
Priority date: 2008-10-24
Filing date: 2008-10-24
Publication date: 2009-07-22
Anticipated expiration: 2018-10-24

Abstract

The utility model relates to a heat dissipating device of a white light LED of a headlamp for a vehicle belonging to the technical field of the vehicle lighting, which comprises a white light LED, a heat pipe, a condensing seat and an evaporating seat, wherein the evaporating seat is provided with an evaporating base plate and a first radiating fin which is integrated with the evaporating base plate into a whole, the condensing seat comprises a condensing base plate and a second radiating fin which is integrated with the condensing base plate into a whole, the surface area of the condensing base plate is bigger than the surface area of the evaporating base plate by 4-6 times, a heat pipe evaporating section and a heat pipe condensing section on both sides of the heat pipe are respectively fixedly connected in the evaporating base plate and the condensing base plate, and the white light LED is stuck on the evaporating base plate through heat-conducting glue. The heat dissipating device changes the structure of the prior art, can rapidly transfer the heat generated by the white light LED outside, which prevents the defect of a pure metallic radiating fin that the heat quantity of each of the radiating fins is distributed unevenly, the device guarantees the sufficient heat dissipating area, and also has high fin efficiency, thereby effectively controlling the temperature of the bonding points of the white light LED and enabling the LED to normally and stably emit light.

Description

The heat abstractor of white light LED of automobile head light

Technical field

The utility model relates to a kind of heat abstractor of white light LED of automobile head light, belongs to automobile-used lighting technical field.

Background technology

A kind of traditional osram lamp or based on halogen bulb of adopting of the light source of automobile-use headlamp for reaching instructions for use, adopts the bulb of 16～21W usually, by speculum light source reflexed to the place ahead.This light source adopts and all exists short, defectives such as brightness is low, power consumption is big, exciter response time length, travel safety difference in service life.Another kind is to adopt advanced white light LEDs as light source, has light source utilization rate height, long service life, and the exciter response time is short, and travel safety is good, and helps advantage such as vehicle appearance design.But under present luminous efficiency, powerful white light LEDs can only be converted into luminous energy with the fraction input power, and all the other most energy are converted into heat, effectively sheds if the heat that produces is untimely, junction temperature will raise, and causes that the white light LEDs performance descends even inefficacy.Conventional solution is white light LEDs directly to be attached on the fin dispel the heat.The method since the heat-delivery surface size of LED much smaller than the surface size that attaches the fin on it, bearing main thermolysis so have the middle part fin of the hot route of short-range missile, and the fin effect of fin sidepiece is less, in order to increase the area of dissipation of central region, increase the fin heat radiation and will make the fin heat transfer efficiency reduce and adopt, both increase heat sink sizes and weight, weakened the augmentation of heat transfer effect again.

Summary of the invention

The purpose of this utility model is to provide the heat abstractor of the high white light LED of automobile head light of a kind of radiating efficiency.

The utility model is that the technical scheme that achieves the above object is: a kind of heat abstractor of white light LED of automobile head light, it is characterized in that: comprise white light LEDs, heat pipe, condensation seat and evaporating seat, evaporating seat have the evaporation substrate and with first radiating fin of evaporation substrate one, the condensation seat comprise the condensation substrate and with second radiating fin of condensation substrate one, the condensation substrate surface area is 4～6 times of evaporation substrate surface area, the heat pipe evaporator section of heat pipe both sides and heat pipe condenser section are fixedly connected on respectively in evaporation substrate and the condensation substrate, and white light LEDs is by on the bonding evaporation substrate of heat-conducting glue.

The utility model is bonded in white light LEDs on the evaporating seat and by heat pipe and is connected with the condensation seat, changed the radiator structure of prior art, the heat that evaporating seat produces white light LEDs at first evenly absorbs and promptly is sent to the condensation seat when dispelling the heat by heat pipe, first radiating fin on the evaporating seat also dispels the heat and plays the effect of strengthening heat radiation, heat can be left rapidly by second radiating fin on the condensation seat, reach the two-stage radiation purpose, improve radiating efficiency.The utility model utilizes the heat-transfer capability of heat pipe superelevation, makes the heat pipe that is arranged in the condensation substrate be almost isothermal, and second radiating fin shares hot-fluid with equalization, has avoided the uneven defective of unavoidable each the fin heat distribution of simple metal fin.In addition, the utility model condensation substrate surface area is 4～6 times of evaporation base-plates surface area, need not to increase under the prerequisite of head lamp body body space, make the parameters such as spacing, fin height and fin thickness of second radiating fin on the condensation substrate that the leeway of significantly adjusting just can be arranged, enough area of dissipations had both been guaranteed, have very high fin efficiency again, thereby effectively control the junction temperature of white light LEDs, make that it can be normally stably luminous.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is the plan structure schematic diagram of Fig. 1.

Fig. 3 is an another kind of structural representation of the present utility model.

Fig. 4 is the plan structure schematic diagram of Fig. 3.

Wherein: the 1-deck, the 2-white light LEDs, the 3-evaporating seat, 3-1-evaporates substrate, 3-2-first radiating fin, 4-heat pipe, 4-1-heat pipe evaporator section, 4-2-heat pipe condenser section, 5-condensation seat, 5-1-condensation substrate, 5-2-second radiating fin, 6-heat-conducting plate.

The specific embodiment

The heat abstractor of white light LED of automobile head light of the present utility model comprises white light LEDs 2, heat pipe 4, condensation seat 5 and evaporating seat 3.See shown in Fig. 1～4, evaporating seat 3 have evaporation substrate 3-1 and with the first radiating fin 3-2 of evaporation substrate 3-1 one, evaporating seat 3 can adopt better copper of conductive performance or aluminum to make, this first radiating fin 3-2 can be the straight rib shape of rectangle.Condensation seat 5 of the present utility model comprise condensation substrate 5-1 and with the second radiating fin 5-2 of condensation substrate 5-1 one, condensation seat 5 also can adopt copper or aluminum to make, the also rectangular straight rib shape of the second radiating fin 5-2, and condensation substrate 5-1 surface area is 4～6 times of surface area of evaporation substrate 3-1, and this evaporation substrate 3-1 surface area is at 15～45cm ²Between, as 25cm ², 30cm ², 35cm ²Deng, the heat pipe evaporator section 4-1 of heat pipe 4 both sides and heat pipe condenser section 4-2 are fixedly connected on respectively in evaporation substrate 3-1 and the condensation substrate 5-1, evaporation substrate 3-1 and condensation substrate 5-1 have through hole respectively, the heat pipe evaporator section 4-1 of heat pipe 4 both sides and heat pipe condenser section 4-2 divide in the through hole that is through evaporation substrate 3-1 and condensation substrate 5-1 fixing by welding, this evaporation substrate 3-1 and condensation substrate 5-1 adopt solid slab, and heat pipe evaporator section 4-1 and heat pipe condenser section 4-2 are by solder flux and evaporation substrate 3-1 and condensation substrate 5-1 welding.Heat pipe of the present utility model 4 adopts the core heat pipe, and heat pipe 4 diameters can make the volume of heat abstractor less at 4～6mm, and white light LEDs 2 is by on the bonding evaporation substrate of the heat-conducting glue 3-1, as silica gel etc.For evaporating seat 3 is heated evenly, the middle part of white light LEDs 2 bonding evaporation substrate 3-1, and white light LEDs 2 neighborings are less than or equal to the neighboring of evaporation substrate 3-1, as shown in Figure 1, evaporation substrate 3-1 adopts square, and white light LEDs 2 adopts equilateral polygon or circle, and evaporation substrate 3-1 adopts other as circle, polygon etc., and the shape of white light LEDs 2 is consistent with evaporation substrate 3-1.The utility model is provided with plural deck 1 at least at evaporation substrate 3-1, white light LEDs 2 sidepieces are connected on the deck 1, white light LED2 are carried out spacing, and this deck 1 can adopt bolt or pin, the groove of white light LEDs 2 sidepieces matches with bolt or pin, and is easy installation and reliable.

Can keep higher heat conduction efficiency, can save material again, shown in Fig. 3～4, condensation substrate 5-1 of the present utility model also can adopt hollow structure, be equipped with three above heat-conducting plates 6 in the substrate 5-1 with fixed attention, heat-conducting plate 6 is provided with through hole or groove, and heat pipe condenser section 4-2 divides the through hole of the heat-conducting plate 6 that passes condensation substrate 5-1, or heat pipe condenser section 4-2 is placed in the groove of heat-conducting plate 6, and heat pipe condenser section 4-2 and each heat-conducting plate 6 are joined.The utility model also can adopt many heat pipes 4, sees shown in Fig. 3～4, is fixed with three heat pipes 4 in evaporation substrate 3-1 and the condensation substrate 5-1, and the condensation substrate 5-1 two sides of condensation seat 5 is equipped with the second radiating fin 5-2, further increases area of dissipation.

When white light LEDs 2 work, evaporation substrate 3-1 contacts with the LED surface, the heat of white light LEDs 2 is imported among the heat pipe evaporator section 4-1, working medium is vaporized immediately, and enters among the heat pipe condenser section 4-2, and the latent heat of vaporization of working substance steam is absorbed at heat pipe condenser section 4-2, and be transmitted in the condensation substrate 5-1 of condensation seat 5, the second radiating fin 5-2 by with the surrounding air heat convection, heat is distributed, get back to heat pipe evaporator section 4-1 after the liquefaction of steam among the heat pipe condenser section 4-2; Evaporate the first radiating fin 3-2 and surrounding air heat convection on the substrate 3-1 simultaneously, played the effect of strengthening heat radiation.Go round and begin again, reach thermal balance at last, white light LEDs 2 junction temperatures are stabilized in the normal range of operation.

Claims

1, a kind of heat abstractor of white light LED of automobile head light, it is characterized in that: comprise white light LEDs (2), heat pipe (4), condensation seat (5) and evaporating seat (3), evaporating seat (3) have evaporation substrate (3-1) and with first radiating fin (3-2) of evaporation substrate (3-1) one, condensation seat (5) comprise condensation substrate (5-1) and with second radiating fin (5-2) of condensation substrate (5-1) one, and condensation substrate (5-1) surface area is 4～6 times of evaporation substrate (3-1) surface area, the heat pipe evaporator section (4-1) of heat pipe (4) both sides and heat pipe condenser section (4-2) are fixedly connected on respectively in evaporation substrate (3-1) and the condensation substrate (5-1), and white light LEDs (2) is by on the bonding evaporation substrate of heat-conducting glue (3-1).

2, the heat abstractor of white light LED of automobile head light according to claim 1 is characterized in that: the middle part of the bonding evaporation substrate of described white light LEDs (2) (3-1), and white light LEDs (2) neighboring is less than or equal to the neighboring of evaporation substrate (3-1).

3, the heat abstractor of white light LED of automobile head light according to claim 1 is characterized in that: condensation substrate (5-1) two sides of described condensation seat (5) is equipped with second radiating fin (5-2), and the rectangular straight rib shape of second radiating fin (5-2).

4, the heat abstractor of white light LED of automobile head light according to claim 1, it is characterized in that: be equipped with three above heat-conducting plates (6) in the described condensation substrate (5-1), heat-conducting plate (6) is provided with through hole, heat pipe condenser section (4-2) divides the heat-conducting plate (6) that passes condensation substrate (5-1), and heat pipe condenser section (4-2) joins with each heat-conducting plate (6).

5, the heat abstractor of white light LED of automobile head light according to claim 1 is characterized in that: described evaporation substrate (3-1) is provided with plural deck at least, and white light LEDs (2) sidepiece is connected on the deck (1).

6, the heat abstractor of white light LED of automobile head light according to claim 1 is characterized in that: described heat pipe (4) is for there being the core heat pipe, and the diameter of heat pipe (4) is at 4～6mm.