WO2011075988A1

WO2011075988A1 - Led illumination device with honeycomb type heat dissipating structure

Info

Publication number: WO2011075988A1
Application number: PCT/CN2010/074366
Authority: WO
Inventors: 张兴; 梁德
Original assignee: 江苏生日快乐光电科技有限公司
Priority date: 2009-12-25
Filing date: 2010-06-24
Publication date: 2011-06-30
Also published as: CN101818871A

Abstract

A LED illumination device with honeycomb type heat dissipating structure comprises a heat dissipating body (100) and an illumination unit (200). The heat dissipating body (100) has a bottom surface (110), a top surface (120) around the bottom surface (110), and a plurality of tubular honeycomb units (130) extended from the bottom surface (110) to the top surface (120). Each honeycomb unit (130) is composed of six unit walls (131) with substantially equal length, and each unit wall (131) is attached to the unit walls (131) of other honeycomb units (130). A first mounting portion (140) in the middle of the bottom surface (110) and a second mounting portion (150) around the first mounting portion (140) are formed in the bottom surface (110) of the heat dissipating body (100), and any end of the honeycomb unit (130) above the first mounting portion (140) and the second mounting portion (150) is enclosed. The illumination unit (200) comprises a group of internal illuminating lamps (210) disposed on the first mounting portion (140) and a group of external illuminating lamps (220) disposed on the second mounting portion (150).

Description

[Invention name established by ISA according to Rule 37.2] LED lighting device with honeycomb heat dissipation structure

Technical field

The present invention relates to a lighting device, and more particularly to an LED lighting device for large space lighting such as street lamps, workshop lights, garden lights, and the like.

Background technique

Street lamps are an important part of urban lighting. Traditional street lamps often use high-pressure sodium lamps. The low-efficiency of high-pressure sodium lamps as a whole has caused huge waste of energy. Therefore, the appearance of LED street lamps is of great significance for urban lighting energy conservation. led (Light Emitting Diode) is a high-efficiency solid-state light source that emits light with weak electrical energy based on a semiconductor PN junction. Under a certain forward bias voltage and injection current, the holes injected into the P region and the electrons injected into the N region diffuse to After the active area, the photons are emitted by radiation, and the electric energy is directly converted into light energy. Since the LED street lamp is a solid cold light source, it has the characteristics of environmental protection, no pollution, low power consumption, high luminous efficiency and long service life.

Under the prior art, as the number of lumens of LED street lamps increases rapidly, the heat dissipation methods used mainly include: heat conduction mode, natural convection heat dissipation, forced cooling of the installed fan, heat pipe and loop heat pipe heat dissipation. The heat conduction method uses a metal heat conduction plate or a heat sink to increase the heat dissipation area. However, the weight and the windward area are too large. Because the street lamp is several meters high, the risk is increased if it is too heavy, especially in the event of a typhoon or an earthquake. Adding a fan to force the heat dissipation system is complicated, the reliability is low, and the heat pipe and the loop heat pipe heat dissipation method are high in cost; since the street lamp has the advantages of outdoor use and the heat dissipation surface is located above, which is advantageous for natural convection heat dissipation of the air, it is recommended that the LED street lamp select natural as much as possible. Convection cooling method.

Summary of the invention

In order to solve the problems in the prior art, it is an object of the present invention to provide a honeycomb structure flue-type heat-dissipating LED lighting device having a small mass and a large heat dissipation area.

In order to achieve the above object, the present invention provides a honeycomb structure flue-type heat-dissipating LED lighting device, which comprises a heat sink and a lighting unit disposed on the heat sink. The heat dissipating body has a bottom surface and a top surface extending around the bottom surface and extending in a height direction. The heat dissipating body has a plurality of tubular honeycomb units extending from the bottom surface to the top surface, and each honeycomb unit is composed of six unit walls having substantially equal lengths. Each cell wall is coupled to the cell walls of the other cell units, and the respective cell units are arranged in parallel along the length direction of the cell wall. The bottom surface of the heat dissipating body is formed with a first mounting portion at the middle of the bottom surface and surrounding the first mounting. a second mounting portion of the portion, the end of either end of the first mounting portion and the honeycomb unit above the second mounting portion is closed; the lighting unit includes an internal light-emitting lamp set disposed on the first mounting portion and is disposed in the second mounting portion External illuminated light set on the part.

Preferably, each of the honeycomb units has a cell wall length of 5 mm to 10 mm and a wall thickness of 0.5 mm to 1 mm.

Preferably, the middle portion of the bottom surface of the heat sink is recessed toward the top surface and the lower end portion of the honeycomb unit located above it is closed to form a first mounting portion, and the bottom surface of the heat sink body is recessed toward the top surface at a position around the center and is located above the top surface. The lower end of the honeycomb unit is closed to form a second mounting portion.

More preferably, the first mounting portion has a flat bottom surface, and the second mounting portion has a bottom surface that is inclined toward the outside of the heat sink.

More preferably, the bottom surface of the second mounting portion is at an angle of 5 to 10 degrees from the horizontal plane.

Preferably, the heat sink is formed from a cast aluminum material, which greatly reduces the weight of the heat sink.

Preferably, the heat sink is streamlined, which reduces the wind resistance of the heat sink and increases the safety performance of the product.

Preferably, the internal light-emitting lamp set includes at least one LED light-emitting component, and the external light-emitting light set includes a plurality of LED light-emitting components spaced apart from each other in the second mounting portion.

Further, the internal light group is an integrated package type LED lighting part, and the external light group is an integrated package type LED lighting part or a single type LED lighting part.

Further, the power of the internal light-emitting lamp group is 30 W to 60 W, and the power of the external light-emitting lamp group is 60 to 120 W.

Due to the adoption of the above technical solution, the present invention can significantly reduce the heat dissipation area while significantly reducing the weight of the lamp body, and at the same time, has the beneficial effects of saving energy, reducing production cost, and simple light distribution. .

DRAWINGS

1 is a perspective view of an embodiment of a honeycomb structured flue-type heat sink LED lighting device in accordance with the present invention;

Figure 2 is a partial enlarged view of the honeycomb structure shown in Figure 1;

Figure 3 is a bottom plan view of an embodiment of a honeycomb structured flue-type heat sink LED lighting device in accordance with the present invention;

4 is a top plan view of an embodiment of a honeycomb structured flue-type heat sink LED lighting device in accordance with the present invention.

Wherein: 100, heat sink; 200, lighting unit; 300, connecting portion;

110, bottom surface; 120, top surface; 130, honeycomb unit; 131, unit wall; 140, first mounting portion; 150, second mounting portion; 210, internal light group; 220, external light group.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which the advantages and features of the invention can be more readily understood by those skilled in the art.

Referring to FIG. 1 to FIG. 4, the honeycomb structure flue-type heat-dissipating LED illumination device of the present embodiment is composed of a heat dissipating body 100, a lighting unit 200 disposed on the heat dissipating body 100, and a connecting portion 300 disposed on the heat dissipating body 100. Wherein the connecting portion 300 is for connecting with the lamp post to support the entire lighting device.

The heat dissipating body 100 has a bottom surface 110 extending in a horizontal plane and a top surface 120 extending around the bottom surface 110 and extending in a height direction. The heat dissipating body 100 is streamlined as a whole to reduce the force receiving area in a high wind environment; The tubular honeycomb unit 130 extends from the bottom surface to the top surface, and each of the honeycomb units 130 is disposed in parallel along the length direction across the unit wall 131.

The bottom surface 110 of the heat sink 100 is formed with a first mounting portion 140 at a middle portion of the bottom surface and a second mounting portion 150 surrounding the first mounting portion 140, and any of the first mounting portion 140 and the honeycomb unit 130 above the second mounting portion 150 The end of one end is closed. As a preferred solution, the middle portion of the bottom surface of the heat sink 100 is recessed toward the top surface to form a hexagonal recess to form a first mounting portion 140. The bottom surface of the hexagonal recess is flat and will be located above it. The lower end portion of the honeycomb unit is closed; the bottom surface of the heat sink 100 is recessed toward the top surface at a position around the center to form an annular groove to form a second mounting portion 150, the bottom of the groove facing the outer side of the heat sink 100, and The lower end of the honeycomb unit located above it is closed, and the bottom surface is preferably at an angle of 5 to 10 degrees from the horizontal plane.

As shown in Fig. 2, each of the honeycomb units 130 is composed of six unit walls 131 of substantially equal length, each unit wall being bonded to the unit walls 131 of the other honeycomb units, thereby constituting a honeycomb structure. Since both facts and theories prove that the honeycomb structure uses the least amount of raw materials, but occupies the largest space area, and the structural stability is optimal, the present invention minimizes the weight of the heat sink 100 due to the use of the honeycomb structure. The earth saves production materials and greatly increases the heat dissipation area, while the structure is very stable. Preferably, each of the honeycomb units has a cell wall length of 5 mm to 10 mm and a wall thickness of 0.5 mm to 1 mm, thereby achieving an optimum balance effect of various aspects of performance.

As can be seen from the above, the heat dissipating body 100 can be produced by one-time manufacturing of a metal material, or can be assembled from a formed aluminum sheet, and preferably a metal material having a lower density such as a cast aluminum material, thereby forming the honeycomb. The parameters such as the size, shape, and the like of the unit 130, the first mounting portion 140, and the second mounting portion 150 can be specifically determined by the mold, and then molded at a time, and the production cost is low. It should be noted that the first mounting portion 140 and the second mounting portion 150 are not limited to the configuration in this embodiment. For example, the first mounting portion 140 may be completely circular, and the second mounting portion 150 may also be completely A plurality of recesses surrounding the first mounting portion 140 are not illustrated here.

The connecting portion 300 is used for connecting with the lamp post to support the entire lighting device. In the embodiment, it is specifically a threaded hole, and may also be a plurality of ways such as a recess matching the shape of the lamp post.

As shown in FIG. 3 and FIG. 4, the lighting unit 200 includes an internal light-emitting lamp set 210 disposed on the first mounting portion 140 and an external light-emitting light set 220 disposed on the second mounting portion 150. The internal light-emitting group 210 adopts integrated package type LED lighting components, and the integrated package type LED lighting components adopt an integrated package form, and the plurality of LEDs are packaged together so that the power can be large, and the integrated package type LED lighting components are tightly fixed to the first a central light source is formed in the recess of the mounting portion 140; the external light emitting group 220 in this embodiment is composed of a plurality of single-type LED lighting components, and the plurality of single-body LED lighting components are recessed in the second mounting portion 150. The equidistant distribution in the groove, because the bottom of the second mounting portion 150 is inclined outward by 5 to 10 degrees, the light distribution process is finally realized, and the light intensity distribution is uniform in the illumination region, and the external illumination group 220 can also be Integrated packaged LED lighting components.

Thus, when in the working state, the heat is respectively diffused to the peripheral honeycomb unit 130 centering on the location of the light-emitting component, and when diffused to each of the honeycomb cells 130, respectively, the heat is less dense, and the honeycomb unit 130 is upward. The motion flows out from the upper port, and the cold air is automatically replenished from the lower port; it can also be seen that when it is rainy, the rainwater can automatically flush the honeycomb unit 130, thereby realizing the function of automatic cleaning.

The following is a calculation of the heat dissipation experimental data of the existing honeycomb lighting device for the honeycomb structure flue-type heat-dissipating LED lighting device in this embodiment:

Design LED lamp power is 90W, LED light efficiency is about 100lm/W, then

Luminous flux from LED: Φ=90W×100lm/W=9000lm

The energy output as light is: 9000/683=13.18W

As the thermal energy output is: 90W-13.18W=76.82W

Release heat: Q=0.24×76.82=18.4368K

And existing LED lighting devices:

The long-axis 400mm, short-axis 247mm oval lamp head with 216mm 80mm base, the average thickness is 80mm.

The contact area between the lamp body and the air is approximately: S = (S _ellipse + S _base ) × 2 + S _{side area} = (75360 + 17280) × 2 + 160000 = 365280 mm ²

The average heat dissipation per square centimeter is: 18.4348/(365280×10 ^-2 )=0.005046K

For honeycomb structure flue-type cooling LED lighting:

The contact area between the lamp body and the air is approximately: S'=S _hexagonal × N+S _{side area} = 4800mm ² × 210 + 160000 = 1168000mm ²

The average heat dissipation per square centimeter is: 18.4348/(1168000×10 ^-2) =0.001578K

Experiments have shown that the heat dissipation efficiency of a honeycomb flue-type street lamp is more than three times that under normal conditions. With 90W LED For example, the street lamp is used in the honeycomb structure flue-type heat dissipation mode at an ambient temperature of 25 ° C, continuous operation for 10 hours in a windless environment, and the lamp body temperature does not exceed 50 ° C, which solves the problem of heat dissipation of the LED street lamp; thus controlling the light Decay, extend the effective life of LED; In addition, the weight of the molded lamp shell is only 5Kg, which is one-half of the similar products, and the heat dissipation area is three times that of similar products; the heat dissipation efficiency is six times that of similar products.

Through the above embodiments, it is not difficult to see that the present invention is a honeycomb structure flue-type heat-dissipating LED lighting device with small mass and large heat dissipation area.

The present invention has been described in detail above with reference to the embodiments of the present invention, which is intended to illustrate the technical concept and features of the present invention. The equivalent changes or modifications made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

Claims

A honeycomb structure flue-type heat-dissipating LED lighting device, characterized in that it comprises:

a heat dissipating body having a bottom surface and a top surface extending around the bottom surface and extending in a height direction, the heat dissipating body having a plurality of tubular cells extending from the bottom surface to the top surface Unit, each of the honeycomb units is composed of six unit walls of substantially equal length, each unit wall being coupled to a unit wall of another honeycomb unit, the individual honeycomb units being parallel in length along the unit wall Provided that the bottom surface of the heat dissipating body is formed with a first mounting portion at a middle portion of the bottom surface and a second mounting portion surrounding the first mounting portion, the first mounting portion and the second portion The end of either end of the honeycomb unit above the mounting portion is closed;

a lighting unit, the lighting unit comprising an internal light-emitting lamp set disposed on the first mounting portion and an external light-emitting lamp set disposed on the second mounting portion.

2. The honeycomb structured flue-type heat-dissipating LED lighting device according to claim 1, wherein each of the honeycomb units has a cell wall length of 5 mm to 10 mm and a wall thickness of 0.5 mm to 1 mm.

3. The honeycomb structured flue-type heat-dissipating LED lighting device according to claim 1, wherein a central portion of the bottom surface of the heat dissipating body is recessed toward the top surface and the lower end portion of the honeycomb unit located above it is closed. Forming the first mounting portion, the bottom surface of the heat sink is recessed toward the top surface at a position around the center, and the lower end portion of the honeycomb unit located above thereof is closed to form the second portion Installation department.

The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 3, wherein the first mounting portion has a flat bottom surface, and the second mounting portion has a lateral direction of the heat dissipating body Tilted bottom surface.

The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 4, wherein the bottom surface of the second mounting portion is at an angle of 5 to 10 degrees from the horizontal plane.

6. The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 1, wherein the heat dissipating body is made of a cast aluminum material.

7. The honeycomb structured flue-type heat-dissipating LED lighting device according to claim 1, wherein the heat dissipating body is streamlined.

8. The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 1, wherein said internal light-emitting lamp group comprises at least one LED light-emitting component, and said external light-emitting lamp group comprises a plurality of said The LED lighting components are disposed at intervals in the second mounting portion.

9. The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 8, wherein the internal light-emitting lamp group is an integrated package type LED lighting component, and the external light-emitting lamp group is an integrated package type LED. Lighting components or single-type LED lighting components.

The honeycomb structure flue-type heat-dissipating LED lighting device according to claim 9, wherein the internal light-emitting lamp group has a power of 30 W to 60 W, and the external light-emitting lamp group has a power of 60 to 120 W. .