The disclosure relates to a light module and a light assembly using the same, more particularly to a light module utilizing a phase-change cooling loop and a light assembly using the light module.

Although having not replaced all of the traditional incandescent lamps, light-emitting diodes (LEDs) have become popular lighting devices. LEDs have advantages of being environmentally friendly and energy saving. In addition, LEDs have longer lifespan than the incandescent lamps. A plurality of LEDs together can be a light source with high-power and high-brightness, thereby being capable of replacing indoor and outdoor incandescent lamps. Since LEDs are eco-friendly, they are expected to be the future of the lighting industry.

Nevertheless, today's heat dissipation process of the LED is applied by thermal conduction and the results thereof are not satisfactory. Moreover, the fins need to be disposed near the LED so the space allocation of components of the LED is not flexible. Therefore, it is crucial to design a heat dissipation system for the LED which can overcome these problems.

The disclosure is a light module for solving the unsatisfactory heat dissipation performance and a light assembly using the same.

A light module comprises a luminous component and a heat dissipating component. One side of the heat dissipating component is in thermal contact with the luminous component. The heat dissipating component has a first chamber, a second chamber and two channels connecting the first chamber and the second chamber. The distance from the second chamber to the luminous component is greater than that from the first chamber to the luminous component, and a working fluid is filled in the first chamber. When the working liquid absorbs heat generated from the luminous component, the working liquid vaporizes from the liquid state to the gaseous state and flows into the second chamber via one of the two channels for the heat dissipation. After the working liquid in the second chamber condenses from the gaseous state to the liquid state, it flows back to the first chamber via the other channel.

A light assembly comprises a canopy and a plurality of light modules 10 disposed on one side of the canopy. Each of the light modules comprises a luminous component and a heat dissipating component. One side of the heat dissipating component is in thermal contact with the luminous component. The heat dissipating component has a first chamber, a second chamber and two channels connecting the first chamber and the second chamber. The distance from the second chamber to the luminous component is greater than that from the first chamber to the luminous component, and a working fluid is filled in the first chamber. When the working liquid absorbs heat generated from the luminous component, the working liquid vaporizes from the liquid state to the gaseous state and flows into the second chamber via one of the two channels for the heat dissipation. After the working liquid in the second chamber condenses from the gaseous state to the liquid state, it flows back to the first chamber via the other channel.

Therefore, a cyclic close-loop is formed by the arrangement of the two channels, and the convection of the working liquid as well as the working gas accelerates the heat conduction. This structure design may omit the active heat dissipating component and can significantly improve the heat dissipation effect.

The present disclosure will become more fully understood from the detailed description given hereinbelow, along with the accompanying drawings which are for illustration only, thus are not limitative of the present disclosure, and wherein:

• FIG. 1 is a perspective view of a light module according to the first embodiment of the disclosure;
• FIG. 2 is a sectional view of FIG. 1;
• FIG. 3 is a perspective view of a light module according to the second embodiment of the disclosure;
• FIG. 4 is a sectional view of FIG. 3; and
• FIG. 5 is a perspective view of a light assembly according to an embodiment of the disclosure.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

FIG. 1 is a perspective view of a light module according to the first embodiment of the disclosure; FIG. 2 is a sectional view of FIG. 1. As seen in FIGs. 1 and 2, in this embodiment, the light module 10 comprises a luminous component 12 and a heat dissipating component 14. The luminous component 12 of the disclosure is a solid-state light-emitting element. In this embodiment, the luminous component 12 is a light-emitting diode, but it is not limited thereto. The heat dissipating component 14 has a first main body 141, a second main body 142, a first chamber 145, a second chamber 146, two channels 148, a fin group 149 and a working liquid 19.

One side of the first main body 141 is in thermal contact with the luminous component 12. The first chamber 145 is located inside the first main body 141, while the second chamber 146 is located inside the second main body 142. The fin group 149 is disposed on the second main body 142. The two channels 148 are located between the first chamber 145 and the second chamber 146 and connect them. In this embodiment, the number of the channels is two, but the disclosure is not limited thereto. In other embodiments, the number of the channels can be adjusted if needed. The distance from the second chamber 146 to the luminous component 12 is greater than that from the first chamber 145 to the luminous component 12, and a working fluid 19 is filled in the first chamber 145. In this embodiment, the working liquid 19 is water, but it is not limited thereto. In other embodiments, the working liquid 19 may be refrigerant, methanol, ethanol, diethyl ether or any liquid which can facilitate heat conduction. Furthermore, in this embodiment, the cross-sectional area A1 of each of the two channels 148 is much smaller than the cross-sectional area A2 of the second chamber 146.

Now the heat dissipation process of the heat dissipating component 14 dissipating the heat generated by the luminous component 12 will be illustrated. When the luminous component 12 generates heat, it is transferred to the first chamber 145 in the first main body 141. After the working liquid 19 in the first chamber 145 absorbs the heat generated by the luminous component 12, it vaporizes, from the liquid state, into the working gas 19'. The working gas 19' rises and flows into the second chamber 146 of the second main body 142 along a first direction D1 (as shown in FIG. 2). In this embodiment, since the fin group 149 is disposed on the second main body 142, the heat of the working gas 19' can be dissipated via the fin group 149. However, the disclosure is not limited thereto. In other embodiments, the heat of the working gas 19' can be directly dissipated to the external environment by the second main body 142. Since the heat is dissipated after the working gas 19' enters the second chamber 146, the working gas 19' gradually condenses into the working liquid 19. Subsequently, the working liquid 19 flows back to the first chamber via the other channel 148 along a second direction D2. Furthermore, in other embodiments, since the cross-sectional area A1 of the channel 148 is much smaller than the cross-sectional area A2 of the second chamber 146, a great pressure difference exists between them. Therefore, the working liquid 19' flows into the second chamber 146' as a high-speed airflow R1 along the first direction D1, which accelerates the heat conduction and the convection.

In the light module 10 of the first embodiment, the working liquid 19 vaporizes into the working gas 19' for accelerating the heat conduction, and the working gas 19' flows into the second chamber 146 via one of the two channels 148 for heat dissipation. After the working gas 19' condenses into the working liquid 19, it flows back to the first chamber 145 via the other channel 148. In this way, a cyclic close-loop is created and it can contribute to a better cooling effect due to the convection. Moreover, in this way, the disposition of an active heat dissipating component is omitted. By the arrangement of the two channels, the light module 10 can perform remote heat dissipation. That is, the part of the structure for heat conduction is separated from the part of the structure for heat dissipation. Thus, the interior space allocation of the whole structure is flexible. Additionally, in this embodiment, the working liquid 19' flows into the second chamber 146' as a high-speed airflow R1 along the first direction D1 which accelerates the heat conduction and the convection.

Moreover, a light module with a different structural design is provided. Referring to FIG. 3 and FIG. 4, FIG. 3 is a perspective view of a light module according to the second embodiment of the disclosure; FIG. 4 is a sectional view of FIG. 3. In the second embodiment, a light module 20 comprises a luminous component 22 and a heat dissipating component 24. In this embodiment, the luminous component 22 is a light-emitting diode, but it is not limited thereto. The heat dissipating component 24 has a main body 241, a first chamber 245, a second chamber 246, two channels 248, a fin group 249 and a working liquid 29.

One side of the main body 241 is in thermal contact with the luminous component 22. The first chamber 245, the second chamber 246 and the two channels 248 are located inside the main body 241. The fin group 249 is disposed on one side of the main body 242 away from the luminous component 22. The two channels 248 connect the first chamber 245 and the second chamber 246. In this embodiment, the number of the channels 248 is two, but it is not limited thereto. In other embodiments, the number of the channels can be adjusted if needed. The distance from the second chamber 246 to the luminous component 22 is greater than that from the first chamber 245 to the luminous component 22, and a working fluid 29 is filled in the first chamber 245. In this embodiment, the working liquid 29 is water, but it is not limited thereto. In other embodiments, the working liquid 29 may be refrigerant, methanol, ethanol, diethyl ether or any liquid which can facilitate heat conduction. Furthermore, in this embodiment, the cross-sectional area A1 of each of the two channels 248 is much smaller than the cross-sectional area A2 of the second chamber 246.

The heat dissipation process of the light module 20 of the second embodiment is similar to the light module 10 of the first embodiment, so it is not illustrated again.

Furthermore, a light assembly is provided. FIG. 5 is a perspective view of a light assembly according to an embodiment of the disclosure. As seen in FIG. 5, the light assembly 30 comprises a canopy 40 and a plurality of light modules 10 of the first embodiment. The light modules 10 are disposed on one side of the canopy 40, thereby forming a canopy LED device. However, in other embodiments, the light assembly 30 may comprise a canopy 40 and a plurality of light modules 20 of the second embodiment. That is, both the light module 10 and the light module 20 may be applied to the canopy LED device.

To sum up, the cyclic close-loop is formed by the arrangement of the two channels, and the convection of the working liquid as well as the working gas accelerates the heat conduction. This structure design may omit the active heat dissipating component and can significantly improve the heat dissipation effect.

Additionally, the cross-sectional area of each of the two channels is much smaller than the cross-sectional area of the second chamber so that the great pressure difference exists between them. Thereby, the working gas can flow into the second chamber as a high-speed airflow, thereby accelerating the heat conduction and convection. Consequently, the heat dissipation performance is improved considerably.