CN205664330U - High -power light -emitting diode (LED) radiator - Google Patents

Abstract

The utility model discloses a high-power LED radiator, which relates to the technical field of heat dissipation and cooling of lighting devices. The radiator includes a radiator body, the radiator body is a hollow cylindrical structure, the upper end opening of the cylindrical structure is closed by an end cover, and the lower end opening is closed by a heat sink heat absorbing evaporator, which is connected with the radiator The inside of the body forms a closed cavity structure, the heat sink evaporator is provided with a heat exchange medium, the outer wall of the radiator body is provided with annular cooling fins, and the inner wall of the radiator body A number of fin grooves are opened on the top, and the fin grooves are evenly distributed along the circumference of the cylindrical structure and extend in the axial direction. The heat sink has the advantages of fast start-up of heat conduction, good heat exchange effect, long service life, and convenient processing and installation.

Description

High Power LED Radiator

technical field

The utility model relates to the technical field of heat dissipation and cooling of lighting devices, in particular to a high-power LED radiator.

Background technique

As a new generation of green light source and an environmentally friendly solid-state lighting source, LED has become the focus of people's attention and is being widely used in the lighting industry. It has a series of advantages such as low power consumption, pure light and color, all solid state, light weight, small size, and environmental protection. LED is a photoelectric device, only 15% to 25% of the electrical energy is converted into light energy during its working process, and almost all the rest of the electrical energy is converted into heat energy, which increases the temperature of the LED. In the use of high-power LEDs, heat dissipation is an important issue. For example, if a 10W white light LED has a photoelectric conversion efficiency of 20%, 8W of electrical energy will be converted into heat energy. If no heat dissipation measures are taken, the core temperature of the high-power LED will rise rapidly. When the rise exceeds the maximum allowable temperature, the high temperature will lead to the reduction of photons emitted by the chip, the quality of the color temperature will decrease, the aging of the chip will be accelerated, and the life of the device will be shortened. Therefore, in the design of high-power LED lamps, the most important design work is the heat dissipation design.

At present, the related technology of LED heat dissipation system in China is not very mature. The heat dissipation design of LED mostly adopts aluminum heat dissipation fins to increase the heat dissipation area. The heat generated during the heating is exported in time, the heat dissipation effect is not ideal, and the heating element usually reaches a higher temperature.

At present, the phase change radiator is applied to the field of LED heat dissipation through research, and the structure surrounding the heat dissipation fin is adopted, and the heat transfer medium is filled in the central cavity to improve the heat conduction efficiency; but because the evaporation section and the condensation section are in the same cavity, The heat exchange medium will occupy a part of the inner cavity volume of the radiator, thereby reducing the effective heat exchange area of the radiator to a certain extent, and the wall thickness between the central cavity and the heat dissipation fins is relatively large, the thermal resistance is obvious, and the heat dissipation effect is not good. Ideal, so propose the utility model.

Utility model content

The technical problem to be solved by the utility model is to provide a high-power LED radiator, which has the advantages of quick start-up of heat conduction, good heat exchange effect, long service life, and convenient processing and installation.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-power LED radiator, characterized in that it includes a radiator body and a heat sink heat-absorbing evaporator, and the radiator body is a hollow cylindrical shape structure, the upper opening of the tubular structure is closed by an end cover, the lower opening is closed by a heat sink heat-absorbing evaporator, and the heat sink heat-absorbing evaporator and the hollow part of the radiator body form a closed cavity structure, so The heat-absorbing evaporator of the heat sink is provided with a heat exchange medium, the outer wall of the radiator body is radially provided with cooling fins, and the inner wall of the radiator body is radially provided with several fin grooves, and the fin grooves are arranged along the radial direction. The cylindrical structure extends axially.

A further technical solution is: the heat sink evaporator is a container structure with an open upper end and a closed lower end, the upper end opening of the heat sink evaporator is located on the lower side of the radiator body, and the LED light source is fixed on the The heat sink is the lower bottom surface of the heat-absorbing evaporator.

A further technical solution is: the fin grooves are divided into several groups, and are evenly arranged along the inner wall of the cylindrical structure.

A further technical solution is that: the volume of the heat sink heat absorbing evaporator is not less than the initial charge of the heat exchange medium.

A further technical solution is that: the heat sink body and the heat dissipation fins on it are integrally processed and formed from aluminum.

A further technical solution is that: the heat exchange medium is a medium that undergoes a phase change at 30°C-80°C.

A further technical solution is that: the lower end of the heat sink evaporator is a heat sink made of copper.

A further technical solution is: the contact surface of the heat sink between the LED light source and the heat sink evaporator is coated with high thermal conductivity silica gel.

The beneficial effect of adopting the above technical solution is that: the heat sink evaporator is designed so that the liquid phase heat exchange medium is all in its cavity, and the gaseous working medium will enter the radiator cavity only after the phase change occurs after being heated. Thus, the evaporating section and the condensing section are completely separated and work independently. This structure avoids the volume of the inner cavity of the radiator occupied by the liquid-phase heat exchange medium to the greatest extent (occupation of the inner cavity volume of the radiator will reduce the utilization rate of the radiator and reduce the available heat exchange area), thereby improving the heat dissipation performance.

In addition, through thermal structure matching and strengthening, the comprehensive performance of heat transfer and heat dissipation of the radiator can be further improved. Thermal resistance, speed up heat conduction.

Using the heat transfer medium stored in the heat-absorbing evaporator in the heat sink, the vapor and liquid phase change heat transfer, the heat transfer efficiency is high, the heat transfer heat flux density is large, and the heat generated by the LED light source can be effectively absorbed and conducted; while the metal material The finished finned radiator can effectively transfer the heat absorbed by the heat exchange medium to the environment at a high speed for natural convection heat dissipation. Therefore, this structure can effectively eliminate the problem that the thermal resistance of the LED light source affects the service life of the light source due to the inability to dissipate heat effectively.

The application of this technology can further improve the comprehensive heat conduction performance of the radiator, so that the heat of the LED heat source can be quickly and evenly transferred to the radiator, and the heat can be effectively exchanged in the radiator, and the comprehensive heat dissipation efficiency can be increased by more than 30%. The radiator is still cooled by natural air convection without adding forced air cooling or water cooling circulation, and the performance of the radiator is at least 20% higher than that of traditional aluminum profile radiators. Working under the same conditions of the same power, the junction temperature of the LED luminous body is lower, the weight of the overall module is lighter, and the economy and practicability are higher.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is the sectional structural representation of the utility model;

Fig. 2 is the top view structural representation of the utility model after the end cover is removed;

Among them: 1. Radiator body 2. End cover 3. Heat sink evaporator 4. Heat dissipation fin 5. Fin groove 6. LED light source 7. Heat exchange medium.

detailed description

Below in conjunction with the accompanying drawings in the utility model embodiment, the technical solution in the utility model embodiment is clearly and completely described, obviously, the described embodiment is only a part of the utility model embodiment, rather than all implementation example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways that are different from those described here, and those skilled in the art can do so without violating the connotation of the utility model. Under the circumstances, similar promotion is done, so the utility model is not limited by the specific embodiments disclosed below.

As shown in Fig. 1, the utility model discloses a high-power LED radiator, which includes a radiator body 1, and the radiator body 1 is a hollow cylindrical structure. The upper opening of the cylindrical structure is closed by the end cover 2, and the lower opening is closed by the heat sink and heat absorbing evaporator 3, so that the inside of the radiator body forms a closed cavity structure. The cavity structure is provided with a heat exchange medium 7, the outer wall of the radiator body 1 is provided with annular cooling fins 4, and the inner wall of the radiator body 1 is provided with several fin grooves 5 along the radial direction, The fin grooves 5 extend along the axial direction of the cylindrical structure. Preferably, the fin grooves 5 can be grouped, the number of groups ≥ 1, and uniformly arranged along the inner wall of the cylindrical structure.

The heat sink heat-absorbing evaporator 3 is a container structure with an open upper end and a closed lower end. The upper end opening of the heat sink heat-absorbing evaporator 3 is located on the lower side of the radiator body 1. Not less than the liquid volume (initial charge) when the heat exchange medium 7 in the cavity is initially filled. The heat-sink heat-absorbing evaporator 3 is made of metal material, and the bottom is made of copper. The heat sink is in direct contact with the LED light source 6. When in use, the heat-sink heat-absorbing evaporator 3 is filled with a certain amount of heat exchange medium (the filling amount is not more than heat sink evaporator volume).

The heat dissipation fins 4 are made of metal materials with high thermal conductivity (such as aluminum alloy), and adopt the structure surrounding the heat dissipation fins. The area of the fins is designed according to the required heat dissipation parameters, and a number of fin grooves are cut out in the inner center circle array. The gap range is 0.1-0.5mm, and the fin number range is 8-15 fins per group. The heat exchange medium adopts the medium that is prone to phase change (from liquid to gas) at low temperature (30-80°C), such as freon, ammonia, alcohol, acetone, water and some organic compounds (thermal heat exchange agent), etc.

The LED light source 6, the heat sink heat-absorbing evaporator 3, the radiator body 1 and the end cover 2 are fastened and sealed in sequence, and the heat-exchanging medium 7 is filled in the heat sink heat-absorbing evaporator. Reduce the volume of the heat-absorbing evaporator and ensure that the internal cavity of the entire device maintains a high degree of vacuum.

When in use, the LED light source 6 generates heat, which makes the heat exchange medium liquid in the heat sink heat-absorbing evaporator 3 (that is, the evaporation section) absorb heat and quickly vaporize, and the gas phase medium rises into the inner cavity of the radiator body 1 (that is, condenses Section), in contact with the inner surface of the radiator body with a lower temperature, condenses after releasing heat, and the heat is finally transferred to the heat dissipation fins and the environment for natural convection heat dissipation; the condensed liquid-phase heat-exchange medium flows back to the heat-absorbing evaporator of the heat sink 3, so cycle. Finally, the heat is transferred from the heat-absorbing evaporator 3 to the radiator fin 4, and the natural convection of air is used to dissipate heat from the LED.

The design of the heat sink heat-absorbing evaporator makes all the liquid-phase heat exchange medium in its cavity, completely separates the evaporation section and the condensation section, and each works independently, which can prevent the heat exchange medium from evaporating and absorbing heat from occupying the inner cavity volume of the radiator. To a certain extent, the utilization rate of the radiator is reduced to reduce the effective heat exchange area of the radiator and ensure the heat dissipation efficiency. The radiator can be used tilted within a certain angle range, and through structural matching, the heat exchange performance of the radiator can be improved, the heat dissipation can be started faster, and the comprehensive heat transfer effect is better.

The fin grooves on the inner wall of the radiator body are more conducive to the rapid condensation of the gas phase heat exchange medium into the liquid phase medium backflow cycle, and can reduce the thermal resistance of the wall surface and accelerate the conduction of heat energy.

Using the heat transfer medium stored in the heat-absorbing evaporator in the heat sink, the vapor and liquid phase change heat transfer, the heat transfer efficiency is high, the heat transfer heat flux density is large, and the heat generated by the LED light source can be effectively absorbed and conducted; while the metal material The finished finned radiator can effectively transfer the heat absorbed by the heat exchange medium to the environment at a high speed for natural convection heat dissipation. Therefore, this structure can effectively eliminate the problem that the thermal resistance of the LED light source affects the service life of the light source due to the inability to dissipate heat effectively.

The application of this technology can improve the thermal conductivity of the radiator, so that the heat of the LED heat source can be rapidly diffused to various positions of the radiator, and the efficiency of the heat dissipation surface can be increased by more than 30%, and the radiator is cooled by natural convection of air without adding Forced air-cooled or water-cooled circulation, tested at least 20% higher than ordinary aluminum radiator performance. Working under the same conditions of the same power, the junction temperature of the LED luminous body is lower, the weight of the overall module is lighter, and the economy and practicability are higher.

Claims (8)

1. A high-power LED radiator, characterized in that it includes a radiator body (1) and a heat sink evaporator (3), the radiator body (1) is a hollow cylindrical structure, and the tube The upper opening of the structure is closed by the end cover (2), and the lower opening is closed by the heat sink heat-absorbing evaporator (3). The heat sink heat-absorbing evaporator and the hollow part of the radiator body form a closed cavity structure. The heat sink evaporator (3) is provided with a heat exchange medium (7), the outer wall of the radiator body (1) is radially provided with cooling fins (4), and the radiator body (1 ) is provided with several fin grooves (5) radially on the inner wall, and the fin grooves (5) extend axially along the cylindrical structure. 2. The high-power LED heat sink according to claim 1, characterized in that: the heat sink evaporator (3) is a container structure with an open upper end and a closed lower end, and the heat sink evaporator (3) The upper end opening of the radiator body (1) is located on the lower side of the radiator body (1), and the LED light source (6) is fixed on the lower bottom surface of the heat sink evaporator (3). 3. The high-power LED heat sink according to claim 1, characterized in that: the fin grooves (5) are divided into several groups, which are evenly arranged along the inner wall of the cylindrical structure. 4. The high-power LED heat sink according to claim 1, characterized in that: the volume of the heat-absorbing evaporator (3) of the heat sink is not less than the initial charge of the heat exchange medium. 5. The high-power LED heat sink according to claim 1, characterized in that: the heat sink body (1) and the heat dissipation fins (4) thereon are integrally formed by aluminum. 6. The high-power LED heat sink according to claim 1, characterized in that: the heat exchange medium (7) is a medium that undergoes a phase change at 30°C-80°C. 7. The high-power LED heat sink according to claim 1, characterized in that: the lower end of the heat sink evaporator (3) is a copper heat sink. 8. The high-power LED heat sink according to claim 1, characterized in that: the contact surface of the heat sink between the LED light source (6) and the heat sink evaporator (3) is coated with high thermal conductivity silica gel.