CN110778975A - LED headlamp for vehicle and heat dissipation method thereof - Google Patents
LED headlamp for vehicle and heat dissipation method thereof Download PDFInfo
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- CN110778975A CN110778975A CN201911108076.5A CN201911108076A CN110778975A CN 110778975 A CN110778975 A CN 110778975A CN 201911108076 A CN201911108076 A CN 201911108076A CN 110778975 A CN110778975 A CN 110778975A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 60
- 239000002184 metal Substances 0.000 claims abstract description 60
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000001746 injection moulding Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000011257 shell material Substances 0.000 description 78
- 230000000694 effects Effects 0.000 description 12
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3002—Superstructures characterized by combining metal and plastics, i.e. hybrid parts
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (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 an LED headlamp for a vehicle and a heat dissipation method thereof, wherein the method comprises the following steps: the heat dissipation structure comprises a heat conduction plastic shell and a metal heat dissipation frame, wherein the metal heat dissipation frame extends out of the shell to form heat dissipation fins, and the metal heat dissipation frame is in sealing fit with the shell. The part of the metal radiating frame extending out of the shell is provided with a plurality of radiating fins which are distributed in parallel at intervals, so that heat in the car lamp can be rapidly output to the outside of the shell of the car lamp through the radiating fins, and the radiating fins extending out of the shell are radiated through airflow generated in the running process of the car. In addition, the joint part of the metal radiating frame and the shell transmits the heat on the metal radiating frame to the shell, and the heat is quickly radiated outwards from the whole shell; meanwhile, the air flow generated when the vehicle runs quickly cools the whole shell.
Description
Technical Field
The invention relates to a vehicle lamp, in particular to an LED headlamp for a vehicle and a heat dissipation method thereof.
Background
The existing automobile lamps for motor vehicles such as cars and the like in China are developed and adopt LEDs as light sources, the LEDs have the advantages of high lighting effect, long service life, energy conservation, environmental protection and the like, but the current photoelectric conversion efficiency of the LEDs is only 15%, and the rest 85% of the LEDs are converted into heat energy.
In order to solve the problem of LED heat dissipation, the prior art is that a metal heat dissipation frame with larger volume is arranged in a sealed shell of a car lamp, and forced heat dissipation is carried out by using a fan, so that the structure is complex, the price is high, the volume is large, and the sealing performance of the car lamp is difficult to solve; the requirement on the overall sealing performance of the car lamp is high, the fan is adopted for forced heat dissipation, heat is not easy to spread out from the lamp, and the heat dissipation effect is not ideal.
In addition, compared with the LED, the failure rate of the heat dissipation fan is high, once the fan fails, the working temperature of the LED is rapidly increased, and the aging failure of the LED is accelerated; meanwhile, in order to improve the heat absorption effect, the adopted metal heat dissipation frame is large in size and heavy in weight, so that the production cost is overhigh.
How to solve the heat dissipation problem and ensure the integral sealing property, reliability and economy of the car lamp is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automotive LED headlamp capable of integrally and quickly dissipating heat and a heat dissipation method, wherein airflow generated in the driving process of an automobile is used for forcibly cooling a heat-conducting shell and metal heat dissipation fins extending out of the shell so as to achieve an ideal heat dissipation effect.
In order to solve the above problems, the present invention provides a vehicle LED headlamp capable of dissipating heat quickly, including: the heat dissipation structure comprises a heat conduction plastic shell and a metal heat dissipation frame, wherein the metal heat dissipation frame extends out of the shell to form heat dissipation fins, and the metal heat dissipation frame is in sealing fit with the shell.
Preferably, the part of the metal radiating frame extending out of the shell is a plurality of radiating fins distributed in parallel at intervals.
In order to facilitate production and ensure the integral sealing performance of the car lamp, the shell is formed on the metal heat dissipation frame in an injection molding mode.
Furthermore, the shell is provided with a waterproof, dustproof and breathable cap which is the same as the inner cavity of the shell. The automatic breathing device can realize automatic breathing according to the internal air pressure of the shell of the headlamp for the vehicle so as to balance the internal air pressure and the external air pressure of the shell, simultaneously discharge hot air out of the shell, and can suck cold air, thereby further improving the heat dissipation effect.
The shell made of the material is combined with the radiating fins embedded in the shell and extending out of the shell, and after the shell and the radiating fins are combined, the overall radiating effect of the headlamp is further improved. The reason is that: on one hand, the shell and the heat dissipation fins can dissipate heat outwards at the same time; on the other hand, the metal heat dissipation frame with better heat conduction performance can transfer heat to the shell, and the periphery of the shell is provided with heat dissipation fins, so that a large-area heat dissipation body is formed on the periphery of the heat conduction shell. Therefore, the whole heat dissipation effect of the headlamp is greatly improved.
In addition, for prior art, the thickness or the volume of the metal heat dissipation frame of this application can reduce more than 30%, and the reason is that the heat dissipation wing that extends the casing combines can transmit heat, radiating casing fast, and whole radiating rate is very fast, even if adopt the metal heat dissipation frame of thickness thinner, also can ensure LED's normal work and life, and need not to adopt fan etc. to cool off LED.
In order to enable air flow to rapidly circulate at the radiating fins to radiate in the running process of a vehicle, the radiating fins are a plurality of fin bodies distributed in parallel at intervals.
When the automotive headlamp is installed on a vehicle, the heat dissipation fins are vertically distributed and are parallel to the forward direction of the vehicle, and installation gaps are formed around the shell, so that airflow generated in the driving process of the vehicle can forcibly cool the heat-conducting shell and the heat dissipation fins through the gaps.
When the LED lamp is specifically implemented, the transparent cover is arranged on the front side of the shell, the shell and the transparent cover form a sealed cavity, the LED assembly and the metal heat dissipation frame are arranged in the sealed cavity, and the LED assembly is arranged on the metal heat dissipation frame. The metal radiating frame comprises a front panel for arranging the LED assembly and radiating fins connected to the rear side of the front panel; each radiating fin penetrates out of the shell, the middle part of each radiating fin and the shell are subjected to one-time injection molding, so that the contact area between the shell and each radiating fin is larger, the more the radiating fins are, the longer the radiating fins are, the larger the contact area between the radiating fins is, the heat conduction from the radiating fins to the shell is facilitated, and the integral radiating through the shell is further facilitated.
The production method of the LED headlamp for the vehicle comprises the following steps: fixing the metal radiating frame in a mold, filling a gap between each two adjacent radiating fins by using a material or a sheet with a melting point higher than the injection molding temperature for the part of each radiating fin, which needs to extend out of the shell, and then sequentially carrying out mold closing, filling, pressure maintaining, cooling and demolding to remove the material or the sheet.
The heat dissipation method of the automotive headlamp obtained by applying the production method is characterized in that when the automotive headlamp is installed on an automobile, assembly gaps exist around the shell, and the heat dissipation method comprises the following steps: the heat that the LED subassembly during operation of automotive headlamp produced exports outside the heat conduction casing through metal heat dissipation frame in the casing to in-process is gone through the vehicle, the air current that assembly gap department produced carries out quick air-cooling to the heat dissipation wing that extends the casing, and then quick air-cooling metal heat dissipation frame.
Meanwhile, the shell is formed by injection molding after mixing PC plastic particles and submicron aluminum nitride powder; the energy in the shell is transmitted out of the shell through the wall body of the shell, and meanwhile, the joint part of the metal heat dissipation frame and the shell transfers the heat on the metal heat dissipation frame to the shell, so that the heat is quickly dissipated outwards from the whole shell; meanwhile, the air flow generated when the vehicle runs quickly cools the whole shell.
Compared with the prior art, the invention has the positive effects that: (1) the vehicle headlamp is integrally a radiator, the whole shell and the radiating fins are in the same airflow direction, and the vehicle headlamp is large in radiating area and large in heat capacity. The heat-conducting shell and the heat dissipation fins extending out of the shell are forcibly cooled by airflow generated in the running process of the vehicle, the air cooling effect is good, the structure is simple and practical, the cost is greatly reduced, the problem of car light sealing is solved, and the LED headlamp is suitable for any severe environment and is favorable for popularization. The structure is simultaneously suitable for the application of other high-power LED lamps. The metal heat dissipation frame and the shell are made into a whole and extend out of the shell, so that heat in the car lamp can be rapidly output to the outside of the shell of the car lamp through the metal heat dissipation frame, the part, extending out of the shell, of the metal heat dissipation frame is dissipated through air flow generated in the running process of a car, and the problem that the heat in the car lamp cannot be rapidly output is solved. In addition, the aluminum nitride powder is added into the shell material, so that the heat dissipation performance of the shell can be greatly improved, and the whole heat dissipation effect of the headlamp is further improved by combining the metal heat dissipation fins which are embedded into the shell and extend out of the shell; compared with the prior art, the service life of the LED headlamp is prolonged. (2) The shell and the radiating fin of the headlamp for the vehicle are formed by one-time injection molding, so that the production process is simple and convenient, and the cost is lower; (3) the heat dissipation efficiency of the heat dissipation structure of the automotive headlamp is high, so that the size and the weight of the adopted metal heat dissipation frame are reduced by more than 30% compared with those of the prior art, the cost can be greatly reduced, the weight of the automotive headlamp is reduced, the emission reduction of an automobile is facilitated, and the heat dissipation structure of the automotive headlamp has great significance for large-area popularization of an LED automotive lamp. (4) In the invention, the middle part of each radiating fin and the shell are molded by one-time injection, so that the contact area between the shell and each radiating fin is larger, the contact area between the radiating fins is larger when the radiating fins are more and longer in width, the heat conduction from the radiating fins to the shell is facilitated, and the integral heat radiation through the shell is further facilitated. (5) In the invention, when the shell and the metal radiating frame are subjected to injection molding, a material or a sheet with a melting point higher than the injection molding temperature is adopted to fill the gap between each adjacent radiating fin, then mold closing, filling, pressure maintaining, cooling and demolding are sequentially carried out, and finally the material or the sheet is removed, so that the part of each radiating fin extending out of the shell is not adhered with the material of the shell, and the radiating effect is ensured.
Drawings
The invention will be further illustrated with reference to specific examples:
FIG. 1 is a schematic structural diagram of an LED headlamp for a vehicle according to the present invention;
FIG. 2 is a schematic structural diagram of a rear end face of the vehicular LED headlamp;
FIG. 3 is a schematic structural diagram of another LED headlamp for a vehicle according to the present invention;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a top view of FIG. 3;
FIG. 6 is a left side view of FIG. 3;
fig. 7 is a longitudinal sectional view of fig. 3.
Detailed Description
Example 1
Referring to fig. 1 to 2 or fig. 3 to 7, the LED headlamp for a vehicle capable of dissipating heat quickly according to the present embodiment includes: heat conduction casing 1, sealed setting are at translucent cover 2 of this casing 1 front side, and casing 1, translucent cover 2 constitute a sealed chamber, are equipped with LED subassembly and metal heat dissipation frame 4 in this sealed chamber, and on this LED subassembly 3 located metal heat dissipation frame 4, the rear end portion of metal heat dissipation frame 4, and/or bottom, and/or top extended casing 1, sealed cooperation between metal heat dissipation frame 4 and the casing 1.
The metal radiating frame comprises a front panel for arranging the LED assembly 3 and radiating fins 4-1 connected to the rear side of the front panel; the radiating fins 4-1 penetrate out of the shell 1, and the middle parts of the radiating fins 4-1 and the shell 1 are formed in an injection molding mode.
When the headlamp for the vehicle is installed on the vehicle, the heat dissipation fins 4-1 are vertically distributed and parallel to the forward direction of the vehicle, and installation gaps are formed around the shell 1, so that airflow generated in the driving process of the vehicle can forcibly cool the heat conduction type shell 1 and the heat dissipation fins 4-1 through the gaps.
The airflow in the running process of the vehicle can quickly circulate at the radiating fins to radiate, so that the effect of quickly cooling the metal radiating fin bracket 4 is realized.
The shell 1 is formed by mixing PC plastic particles and submicron aluminum nitride powder and then performing injection molding, the heat conductivity coefficient can reach 0.5-0.8W/m-k, and the weight ratio of the PC plastic particles to the aluminum nitride powder is 9: 1 to 15: 1. preferably, 11: 1. compared with a shell which is purely formed by PC plastic particles through injection molding (the heat conductivity coefficient is only 0.28W/m-k), the heat dissipation efficiency of the shell can be greatly improved.
The shell 1 is wholly covered with the radiating fins, the whole area is large, the heat capacity is large, heat on the metal radiating frame 4 can be rapidly absorbed, and the heat is released outwards through the shell 1 and the radiating fins.
The air current that produces when the car moves makes the inside and outside great difference in temperature that produces of casing 1, makes LED during operation temperature dispel the heat through metal heat dissipation frame 4 along two directions (1, the metal heat dissipation fin that metal heat dissipation frame 4 itself exposes outside casing 1, 2, metal heat dissipation frame 4 to casing 1 transmission heat, metal heat dissipation frame 4 and casing 1 outwards release heat together), makes the heat dissipation more abundant, and the effect is better.
By applying the heat dissipation method of the headlamp, when the LED headlamp for the vehicle is installed on the vehicle, assembly gaps exist around the shell 1, and the heat dissipation method comprises the following steps: the heat that the LED subassembly 3 during operation of automotive headlamp produced exports to the casing outside through metal heat dissipation frame in the casing to in-process is gone through the vehicle, the air current that assembly gap department produced is right the heat dissipation wing carries out quick air-cooling, and then quick air-cooling metal heat dissipation frame 4.
Meanwhile, the shell is formed by mixing PC plastic particles and submicron aluminum nitride powder and then performing injection molding to form a heat-conducting plastic shell; the energy in the shell is transmitted out of the shell through the wall body of the shell, and meanwhile, the joint part of the metal heat dissipation frame and the heat-conducting plastic shell transfers the heat on the metal heat dissipation frame to the heat-conducting plastic shell, so that the heat is quickly dissipated outwards from the whole shell; meanwhile, the whole shell is rapidly cooled by airflow generated when the vehicle runs.
Example 2
The production method of the LED headlamp for the vehicle comprises the following steps: fixing the metal heat dissipation frame 4 in a mold, filling the gap between each adjacent heat dissipation fins 4-1 with a material or a sheet with a melting point higher than the injection molding temperature for the part of each heat dissipation fin 4-1, and then sequentially carrying out mold closing, filling, pressure maintaining, cooling and demolding to remove the material or the sheet.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments.
Claims (9)
1. An LED headlamp for a vehicle, comprising: casing (1) and metal heat dissipation frame (4), its characterized in that: the metal heat dissipation frame (4) extends out of the shell (1), and the metal heat dissipation frame (4) is in sealing fit with the shell (1).
2. The vehicular LED headlamp according to claim 1, wherein the portion of the metal heat dissipating frame (4) extending out of the housing (1) is a plurality of heat dissipating fins (4-1) arranged in parallel at intervals.
3. The vehicular headlamp according to claim 1 or 2, characterized in that: further comprising: the transparent cover (2) is arranged on the front side of the shell (1) in a sealing mode, the shell (1) and the transparent cover (2) form a sealing cavity, an LED assembly arranged on the metal heat dissipation frame (4) is arranged in the sealing cavity, and the shell (1) is formed on the metal heat dissipation frame (4) in an injection molding mode.
4. The vehicular LED headlamp according to claim 3, characterized in that: when the headlamp is installed on a vehicle, the heat dissipation fins (4-1) are vertically distributed and are parallel to the forward direction of the vehicle.
5. The LED headlamp for vehicles according to claim 1 or 2, characterized in that: the shell is provided with a waterproof, dustproof and breathable cap communicated with the inner cavity of the shell.
6. The vehicular LED headlamp according to claim 5, characterized in that: the metal radiating frame comprises a front panel for arranging the LED assembly and radiating fins (4-1) connected to the rear side of the front panel;
the radiating fins (4-1) penetrate through the shell (1), and the middle parts of the radiating fins (4-1) and the shell (1) are formed in an injection molding mode at one time.
7. A method for producing the LED headlamp for vehicles according to claim 6, comprising: fixing the metal radiating frame (4) in a mold, filling the gap between every two adjacent radiating fins (4-1) by using a material or a sheet with a melting point higher than the injection molding temperature for the part of each radiating fin (4-1) which needs to extend out of the shell (1), and then sequentially carrying out mold closing, filling, pressure maintaining, cooling and demolding to remove the material or the sheet.
8. The method for dissipating heat from an automotive LED headlamp manufactured by the manufacturing method according to claim 7, wherein the housing (1) has a fitting clearance around its periphery when the headlamp is mounted on a vehicle, the method comprising:
the heat generated by the LED assembly of the headlamp during working is output to the outside of the shell (1) from the inside of the shell through the metal heat dissipation frame (4), and the heat dissipation fins (4-1) extending out of the shell are subjected to quick air cooling through airflow generated at the assembly gap in the driving process of the vehicle, so that the metal heat dissipation frame (4) is quickly air-cooled.
9. The method for dissipating heat of claim 8, further comprising: the heat energy in the shell is transferred out of the shell through the wall body of the shell, meanwhile, the joint part of the metal heat dissipation frame (4) and the shell (1) transfers the heat on the metal heat dissipation frame (4) to the shell (1), and the shell (1) integrally and outwards dissipates the heat quickly; meanwhile, the air flow generated when the vehicle runs quickly cools the whole shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108076.5A CN110778975A (en) | 2015-08-07 | 2015-08-07 | LED headlamp for vehicle and heat dissipation method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108076.5A CN110778975A (en) | 2015-08-07 | 2015-08-07 | LED headlamp for vehicle and heat dissipation method thereof |
| CN201510483563.5A CN105570784B (en) | 2015-08-07 | 2015-08-07 | It is a kind of can integrally, the automobile-used LED headlight and heat dissipating method of rapid cooling |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510483563.5A Division CN105570784B (en) | 2015-08-07 | 2015-08-07 | It is a kind of can integrally, the automobile-used LED headlight and heat dissipating method of rapid cooling |
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| CN110778975A true CN110778975A (en) | 2020-02-11 |
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| CN201510483563.5A Active CN105570784B (en) | 2015-08-07 | 2015-08-07 | It is a kind of can integrally, the automobile-used LED headlight and heat dissipating method of rapid cooling |
| CN201911108076.5A Pending CN110778975A (en) | 2015-08-07 | 2015-08-07 | LED headlamp for vehicle and heat dissipation method thereof |
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| CN107121788A (en) * | 2017-06-27 | 2017-09-01 | 镇江万新光学眼镜有限公司 | A kind of refrigerant glasses of phase transformation and preparation method thereof |
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| JP2002124123A (en) * | 2000-10-17 | 2002-04-26 | Denso Corp | Vehicle headlight |
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| Publication number | Publication date |
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| CN105570784B (en) | 2019-10-11 |
| CN105570784A (en) | 2016-05-11 |
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Application publication date: 20200211 |