CN101922695A

CN101922695A - Heat pipe radiator and high-power LED lamp using same as heat dissipation device

Info

Publication number: CN101922695A
Application number: CN2010102565234A
Authority: CN
Inventors: 于正国; 胡锡兵; 李静静; 向德祥; 许伟伟
Original assignee: ANHUI LADER OPTOELECTRONICS TECHNOLOGY Co Ltd
Current assignee: ANHUI LADER OPTOELECTRONICS TECHNOLOGY Co Ltd
Priority date: 2010-08-17
Filing date: 2010-08-17
Publication date: 2010-12-22

Abstract

The invention discloses a heat pipe radiator, which comprises a heat pipe and radiating fins. The evaporation end of the radiator is provided with a hollow square sealed box body; the inner wall of the sealed box body is provided with a capillary working medium passage in accordance with the inner wall of a heat pipe; the side wall of the sealed box body is provided with a connecting hole connected with the heat pipe; and one end of the heat pipe is fixedly connected with a sealed cavity at the connecting hole. An LED chip is directly encapsulated on the surface of the sealed box body of the heat pipe radiator. The heat pipe radiator has the advantages of large contact area between the evaporation end and a heating element, full heating and capabilities of fully exerting the efficiency of the radiator and increasing the heat transfer capability of the radiator by using a plurality of heat pipes. An LED lamp manufactured by using the radiator has a few intermediate heat transfer paths and high heat transfer rate, improves the luminous efficiency of the LED chip and prolongs the service life of the LED chip so that the power of the lamp manufactured by using a high-power LED integrated light source can be promoted to over 100 watts.

Description

A kind of heat-pipe radiator and make the high-power LED lamp of radiating element with it

Technical field

The present invention relates to a kind of heat-pipe radiator and make the high-power LED lamp of radiating element with it.

Background technology

In electronic devices and components, use the heat-pipe radiator that more generally utilizes the circle heat pipe to make at present, the capillary porosity duct that has metal sintering to form in the tube wall of this round heat pipe, heated liquid vaporization in the evaporation ends inside pipe wall pore, the heat band is liquefied to condensation end again, and be back to evaporation ends through capillary porosity duct, circulation so repeatedly, constantly with the heat band to the low end of temperature.The radiating efficiency of this heat pipe after low temperature is provided with radiating fin is very high, and it is little with circle heat pipe surface contact area that shortcoming is a heater element, several heat pipes need be fixed on one usually and have on mounting platform heat sink, and its capacity of heat transmission is restricted.In order to overcome this shortcoming, flat hot pipe is made after this round heat pipe is flattened by the producer that has, form flat surface, to increase generating surface, improve heat transfer efficiency, although the round heat pipe of flat hot pipe surface area increases, then owing to limited by caliber, its surface area increases limited, and its capacity of heat transmission still is restricted, and is difficult to bring into play its powerful capacity of heat transmission.Particularly on high-power LED lamp, the heat of chip mainly is to reach on the radiator by substrate, because the substrate thermal resistance is excessive, the radiating efficiency of radiator is not in full use, so that the heat that chip PN junction district produces can't in time conduct to the heat radiation terminal efficiently, particularly adopts the high-power LED chip of power in the above integrated optical source of 1W, make junction temperature too high, cause the LED luminous efficiency to descend, wearing out of speed-up chip makes its scope of application and service life be restricted.

Summary of the invention

The objective of the invention is weak point, a kind of heat-pipe radiator is provided, can increase the evaporation ends generating surface, reduce thermal contact resistance, give full play to the heat transfer efficiency of heat pipe at the existence of existing circle heat-pipe radiator; Another object of the present invention provides a kind of high-power LED lamp that utilizes heat-pipe radiator of the present invention to make heat dissipation element, can improve chip to the heat transfer efficiency between the radiator, thereby effectively reduce the LED junction temperature, improve the luminous efficiency of led chip, prolong its service life.

For achieving the above object, heat-pipe radiator of the present invention has adopted following technical scheme: it comprises heat pipe and radiating fin, described heat pipe is circle heat pipe or flat hot pipe, evaporation ends is the square shape sealing box body of a hollow, on the inwall of sealing box body the poroid working medium passage of the capillary consistent with the heat pipe inwall is arranged, the sidewall of sealing box body is provided with the connecting hole that is connected with heat pipe, and heat pipe one end is connected in connection hole and seal chamber.Because the seal box body surface area is big, directly contacts with heater element, can fully conduct heat, also be convenient to install simultaneously heater element.

Because four sidewalls of square shape sealing box body all can connect heat pipe, the heat pipe usage quantity is many more, the heat transfer efficiency superelevation.Therefore each sidewall of the sealing box body of heat-pipe radiator of the present invention is connected with a heat pipe at least.

Adopt the high-power LED lamp of heat-pipe radiator of the present invention as radiating element, comprise led chip, circuit board and heat-pipe radiator, described led chip directly is encapsulated in the seal box surface of heat-pipe radiator as evaporation ends.The advantage of this structure is that the seal box surface as evaporation ends is directly fixed and be encapsulated in to chip, chip P N junction temperature directly is passed to evaporation ends from epitaxial loayer, reduced middle heat transfer path, not only rate of heat transfer is greatly improved, and can give full play to the radiating efficiency of heat-pipe radiator, whole system can comparatively fast reach thermal balance, the LED junction temperature can be reduced to below 125 ℃, improve the luminous efficiency of led chip, prolong its service life, make the lamp power of utilizing high power LED integrated optical source manufacturing can be promoted to more than 100 watts.And the sealing box body enough big surface is provided, can encapsulate the abundant led chip of quantity, can make the LED light fixture of super high power.

The advantage of radiator of the present invention is that evaporation ends and heater element contact area are big, is heated fully, and directly contact can improve the conduction efficiency of radiator, and can use many heat pipes, increases the heat-sinking capability of radiator, also is convenient to install simultaneously heater element.With the LED light fixture that this radiator is made, middle heat transfer path is few, the rate of heat transfer height, the LED junction temperature can be reduced to below 125 ℃, improve the luminous efficiency of led chip, prolong its service life, make the lamp power of utilizing high power LED integrated optical source manufacturing can be promoted to more than 100 watts; And the sealing box body enough big surface is provided, can encapsulate the abundant led chip of quantity, can make the LED light fixture of super high power.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the right view of Fig. 1;

Fig. 3 is the local enlarged diagram in A place among Fig. 2.

The specific embodiment

As shown in Figure 1 and Figure 2, radiator is made up of square shape sealing box body 5, heat pipe 3 and radiating fin 2 as the hollow of evaporation ends, heat pipe can be the circle heat pipe or flatten the flat hot pipe that the back forms, on the inwall of sealing box body 5 the poroid working medium passage of the capillary consistent with heat pipe 3 inwalls is arranged, each sidewall of sealing box body 5 is provided with two connecting holes that are connected with heat pipe 3, and each sidewall has two heat pipes 3 to be connected with sealing box body 5 by being welded on the connection hole.

Led chip 1 directly is encapsulated in sealing box body 5 surfaces by latticed form, is electrically connected with circuit board 4 again.The shell of light fixture and driving electrical appliance part thereof do not draw in the drawings.

Claims

1. heat-pipe radiator, comprise heat pipe (3) and radiating fin (2), described heat pipe is circle heat pipe or flat hot pipe, it is characterized in that evaporation ends is the square shape sealing box body (5) of a hollow, on the inwall of sealing box body (5) the capillary poroid working medium passage consistent with heat pipe (3) inwall arranged, the sidewall of sealing box body (5) is provided with the connecting hole that is connected with heat pipe (3), and heat pipe (3) one ends are connected with sealing box body (5) in the connection hole.

2. heat-pipe radiator according to claim 1 is characterized in that: each sidewall of described sealing box body (5) is connected with a heat pipe (3) at least.

3. an application rights requires the high-power LED lamp of 1 or 2 described heat-pipe radiators as radiating element, comprise led chip (1), circuit board (4) and heat-pipe radiator, it is characterized in that: described led chip (1) directly is encapsulated in sealing box body (5) surface of heat-pipe radiator as evaporation ends.