1. Field of the Invention
The present invention relates to an LED lamp and a cooling method thereof. In particular, the present invention relates to an LED lamp that dissipates heat smoothly, distributes the flow field uniformly, and reduce cost and weight and a cooling method thereof.
2. Description of Related Art
Because LED has a lot of merits, such as brightness is high, consumption power is low, and usage life is long, etc, LED is popularly applied to a variety of lighting devices, such as an LED streetlamp for lighting a road. When LED is lighting, a great amount of heat is generated so that a cooling device is required to dissipate the heat. Therefore, LED can light under a proper temperature and does not burn down. When the cooling device is not designed well, high temperature will lower the brightness of LED, reduce the usage life, and change the wavelength.
Reference is made to
1. The LED lighting device 1a of the prior art usually has a housing 11a and an LED light source device 12a. The LED light source device 12a is directly pasted onto the housing 11a. The light source emits from the bottom of the housing 11a. The housing 11a has a cooling fin 111a with a large dimension to directly exhaust heat to air. However, dust will be accumulated on the housing 11a to affect the cooling effect. Moreover, the thickness of the housing 11a needs to be increased to make the heat be distributed uniformly and the housing 11a is made of heat-conductive metal. The cost and the weight increases.
2. A cooling pipe (not shown in the figure) is used to dissipate the heat of the LED. That will increase the cost and it is difficult to maintain the LED lighting device. Furthermore, due to the system dimension is increased and the LED lighting device becomes complex, it is not to assemble the LED lighting device.
3. Reference is made to
One particular aspect of the present invention is to provide an LED lamp and a cooling method thereof. The LED lamp can dissipate heat smoothly, distribute the flow field uniformly, be easily manufactured, reduces cost and weight, and be expanded.
The LED lamp includes a housing having a cover body and a base, and at least one LED light source module. The cover body is located at the base. The cover body and the base form a cooling space. The base has at least one segment difference portion. The segment difference portion has a plurality of air inlets. The LED light source module is adjacent to the air inlets. The LED light source module includes an optical device and a cooling device. The cooling device is located on the optical device.
The present invention also provides a cooling method for an LED lamp and includes the following steps.
An LED lamp is provided. The LED lamp includes a housing and at least one LED light source module. The housing has a cover body and a base. The base forms at least one segment difference portion. The slanted surface of the segment difference portion has a plurality of air inlets. The LED light source module is adjacent to the air inlets. The LED light source module has a cooling device for dissipating heat generated from the LED lamp to air. The cover body has a plurality of air outlets.
Air is guided into the cooling space formed by the cover body and the base along the air inlet on the slanted surface of the segment difference portion.
When the LED lamp generates heat, air entered into the cooling space is blown to the cooling device along the direction of airflow to dissipate heat.
The airflow with heat is exhausted to outside air from the air outlet of the cover body.
The present invention has the following characteristics.
1. The base has a segment difference portion. The air inlet on the slanted surface of the segment difference portion can guide airflow into the cooling space formed by the cover body and the base to make the cooling airflow smoothly, reduce death zone, and enhance the cooling effect. The quantity of cooling fins can be reduced, and the manufacturing cost and the weigh are also reduced.
2. When the quantity of the LED light source modules is increased, each of the LED light source modules is located at the corresponding air inlet to directly guide airflow to cool the LED light source module. The cooling conditions for each LED light source module are the same to balance the temperature.
3. In addition to cool the LED light source module, the air inlet on the segment difference portion also forms another airflow to cool the adjacent LED light source module to enhance the cooling effect.
4. The LED light source module is a module design, and can be added according to the requirement and expanded.
5. The segment difference portion can be easily manufactured. The segment difference portion has the air inlet to dissipate heat by utilizing the natural convention. No fan is required. The cost is low and the usage life becomes longer.
For further understanding of the present invention, reference is made to the following detailed description illustrating the embodiments and examples of the present invention. The description is for illustrative purpose only and is not intended to limit the scope of the claim.
Reference is made to
The housing 1 is hollow and is made of metal or plastic. The housing 1 includes a cover and 11 and a base 12. In this embodiment, the cover body is pivoted with the base, but not limited to above. The cover body 11 and the base 12 form a cooling space 13.
The cover body 11 has a plurality of air outlets 111, a plurality of concave portions 112 and a trough 113. The air outlets 111 of the cover body 11 are rectangular and are disposed at the top of the cover body 11 at interval and located at two sides of the trough 113. The concave portions 112 are respectively located at the air outlets 111 and its height is lower than the height of the cover body 11 to prevent dust or rain from entering into the housing 1. The trough 113 can receive a support rod 14. One end of the support rod 14 is pivoted with one end of the cover body 11, and another end of the support rod 14 is locked with another end of the cover body 11 via a screw (as shown in
The base 12 has at least one segment difference portion 121. In this embodiment, there are four segment difference portions 121 (as shown in
In this embodiment, there are four LED light source modules 2. Each of the LED light source modules 2 includes a cooling device 21 and an optical device 22. The cooling device 21 is located at the optical device 22. The cooling device 21 is made of aluminum that is a heat-conductive material for absorbing heat. The cooling device 21 has a plurality of cooling fins 211, and the cooling fins 211 are disposed at intervals and in a high-to-low status. The surface of the cooling fins 211 has a plurality of wave-shaped structures 212 to increase the cooling area.
The optical device 22 is transparent, and is rectangular. The bottom of the optical device 22 has a plurality of light-adjusting structures 221 and a plurality of polarizing structures 222 (as shown in
The power supply 3 is located in the base 12 to provide power to the four LED light source modules 2.
The base 12 further has a support structure 4. The support structure 4 is column-shaped, and extends from one end of the base 12 to another end. The LED light source modules 2 are symmetrically locked at two sides of the support structure 4. The front and rear sides of the base 12 have a plurality of cooling openings 124 to enhance the cooling effect. Therefore, the LED lamp has a good cooling effect under different slanted angles. The center of the rear side of the base 12 has a circular installation hole 125 for installing the support column of the lamp.
Reference is made to
S301: An LED lamp is provided.
The LED lamp includes a housing 1, at least one LED light source module 2, and a power supply 3. The structure of the housing 1, the LED light source module 2, and the power supply 3 are the same as the previous description and not repeated again.
S303: Airflow is guided into the cooling space 13 formed by the cover body 11 and the base 12 via the air inlet 122 along the slanted surface 1211 of the segment difference portion 121.
S305: When the LED lamp generates heat, airflow entered into the cooling space 13 is blown to the cooling device 21 along the direction of airflow to dissipate heat.
S307: The airflow with heat is exhausted to outside air from the air outlet 111 of the cover body 11.
The present invention has the following characteristics.
1. The base 12 has a segment difference portion 121. The slanted surface 1211 of the segment difference portion 121 has air inlet 122. The LED light source module 2 is located at the opening 123 of the flat surface 1212 of the segment difference portion 121, and is adjacent to the air inlet 122. Thereby, airflow enters into the cooling space 13 via the air inlet 122 along the slanted surface 1211, and can be smoothly blown to the cooling fins 211. The heat is exhausted from the air outlet 111 of the cover body 11. Death zone is reduced, and the cooling effect is enhanced. The quantity of cooling fins 211 can be reduced, and the manufacturing cost and the weigh are also reduced.
2. When the quantity of the LED light source modules 2 is increased, each of the LED light source modules 2 is located at the corresponding air inlet 122 to directly guide airflow to cool the LED light source module 2. The cooling conditions for each LED light source module 2 are the same to balance the temperature.
3. In addition to cool the LED light source module 2, the air inlet 122 on the slanted surface 1211 of the segment difference portion 121 also forms another airflow to cool the adjacent LED light source module 2 to enhance the cooling effect.
4. The LED light source module 2 is a module design. When the required brightness increases, the quantity of the segment difference portion 121 and the LED light source module 2 is increased and expanded.
5. The segment difference portion 121 can be easily manufactured. By utilizing the natural convention, no fan is required. The cost is low and the usage life becomes longer.
6. Around the air outlet 111, there is a streamline shaped concave portion 112. The height of the concave portion 112 is lower than the height of the cover body 11 so that dust or rain cannot directly enter into the housing 1 to achieve the dust-proof effect and the waterproof effect.
The description above only illustrates specific embodiments and examples of the present invention. The present invention should therefore cover various modifications and variations made to the herein-described structure and operations of the present invention, provided they fall within the scope of the present invention as defined in the following appended claims.
Number | Date | Country | Kind |
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98127158 | Aug 2009 | TW | national |