Patent Application
20070159827
1. Field of the Invention
The present invention relates to a lighting device, and more particularly to a lighting device with a multiple layer cooling structure that cools effectively and is easy to manufacture.
2. Description of Related Art
With reference to
When the light assembly (72) is used, the LEDs (73) generate a significant amount of heat. Since most LEDs (73) only operate effectively in environments below 120° C., the LEDs (73) overheat and fail in environments above 120° C. The casing (70) dissipates heat to some extend from the light assembly (72) and cools the LEDs (73).
However, most casings (70) for outdoor applications must be sturdy and are cast, and the cast casings (70) are expensive and heavier than stamped casings for indoor or protected applications. Furthermore, the casing (70) is only a single-layer so the total surface area and commensurate heat dissipation capability of the casing (70) are limited. The limited total surface area of the casing (70) is not able to dissipate enough heat from the light assembly (72).
To overcome the shortcomings, the present invention provides a lighting device with a multiple layer cooling structure to obviate or mitigate the aforementioned problems.
The primary objective of the present invention is to provide a lighting device with a multiple cooling layer structure that is easy to manufacture and cools more effectively.
The lighting device with a multiple cooling layer structure has at least one mounting heat conductive block, at least one light assembly and multiple heatsinks. The mounting heat conductive block has a front end, a rear end, a side and at least one shoulder. Each shoulder is formed at the side of the mounting bracket. The light assembly is mounted on the front end of the mounting bracket. Each heatsinks is mounted on one of the shoulders and the rear end of the mounting bracket. When the lighting device generates heat, the heat is able to drive away from the mounting bracket to the heatsinks. The lighting device is able to cool down. The mounting heat conductive block and the heat sinks are easy to manufacture and transfer heat more effectively.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The at least one mounting bracket (10) has a front end, a rear end, a side and multiple shoulders (11). Each shoulder (11) is formed on and protrudes out from the side of the mounting bracket (10).
The at least one light assembly (20) is mounted on the front end of the mounting bracket (10) has multiple light emitting diodes (LEDs) (21). In a fifth embodiment as shown in
Multiple heatsinks (30, 30A, 30B, 30C, 30D, 30E) are stacked on each other. Each heatsink (30, 30A, 30B, 30C, 30D, 30E) has at least one through hole and a side. The at least one through hole is formed through the heatsink (30) (30A, 30B, 30C, 30D, 30E) and allows the mounting bracket (10) to extend through and engages with one of the shoulders (11) to mount the heatsink (30, 30A, 30B, 30C, 30D, 30E) on a corresponding one of the shoulders (11) of a corresponding one of the mounting bracket (10) to be able to have a heat transfer's function. A fixing way of the at least one heatsink (30) (30A, 30B, 30C, 30D, 30E) and the at least one mounting bracket (10) may be screwed or wielded.
In a first and a second embodiments of the lighting device with a multiple cooling layer structure, the heatsink (30, 30A) is curved. The curved heatsinks (30, 30A) are for an indoor using.
In the first embodiment of the lighting device with a multiple cooling layer structure, the heatsink (30) further has a reflection surface (31). The reflection surface (31) is next to the light assembly (20) and able to reflect light from the light assembly (20).
In the second, a third, a fourth and a fifth embodiments, the heatsink (30B, 30C, 30D, 30E) is flat. The heatsink (30A, 30B, 30C, 30E) further has multiple optional fins (31A, 31B, 31C, 31E). The fins (31A, 31B, 31C, 31E) are formed on side of the heatsink (30A, 30B, 30C, 30E) and extend up. With reference to
With reference to
The front supporting bracket (60) and the rear supporting bracket (61) are mounted between two of the heatsinks (30E, 30C) to give enough supporting force to the two of the heatsinks (30E, 30C). The front supporting bracket (60) has multiple wind holes (601). The wind holes (601) are formed through the front supporting bracket (60) and allow wind to pass through. The rear supporting bracket (61) has multiple wind holes (611) and a mounting hole (612). The wind holes (611) and the mounting hole (612) are formed through the rear supporting bracket (61).
The mounting rod (40, 62) has a distal end and a proximal end. In the first, second and third embodiments, the distal end of the mounting rod (40) is connected to the rear end of the at least one mounting bracket (10). The proximal end of the mounting rod (40) is mounted at any required location where light is required.
In the fourth and firth embodiments, the distal end of the mounting rod (62) extends through and mounts in the mounting hole (612) in the rear supporting bracket (61).
When the light device (20) emits light, each LED (21) generates heat. The heat from the each LED (21) drive to the mounting bracket (10) and then the heat will transfer to each heatsink (30, 30A, 30B, 30C, 30D, 30E, 30F). The heat from the each LED (21) convects to air. The each LED (21) is able to cool down and avoids to bum down.
Furthermore, in the fourth and fifth embodiments, the heat from the each LED (21) also transfers to the cooling module assembly (50). The cooling fluid of the cooling pipe (53) vapors. Steam of the cooling fluid goes through the cooling pipe (53) and the cooling block (52). The steam of the cooling fluid is cooled down and transforms back to the cooling fluid again in the steamers (52A) of the cooling block (52). However, the light assembly (20) is able to be cooled down more effectively.
The mounting bracket (10) and the heatsink (30) (30A, 30B, 30C, 30D, 30E, 30F) are easy to manufacture and assembly so that total cost of making the lighting device with a multiple cooling layer structure can be lower and economical. Furthermore, the heatsink (30) (30A, 30B, 30C, 30D, 30E, 30F) are able to change its shape to fit any looking requirement and the requirement of big cooling area.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
