CN203202695U - light emitting device - Google Patents

Abstract

The utility model discloses a light-emitting device, including support, an at least heat abstractor and an at least luminescence unit. The bracket is provided with at least one hollow structure. The heat dissipation device comprises a heat dissipation body and a plurality of extension parts. The heat dissipation body is arranged on the support. The extending part extends from the periphery of the heat dissipation body in a radial mode and is exposed in the hollow structure of the support. The light-emitting unit is arranged on the heat absorption end of the heat dissipation body. Because the extension parts extend from the periphery of the heat dissipation body in a radial mode, the cold air around the heat dissipation device can directly contact with the heat dissipation body to carry out heat exchange, and the cold air is not blocked or hindered by the design of the extension parts. In addition, because the extending part is exposed in the hollow structure of the bracket, the hot air at the position of the light-emitting unit can flow in the gap between the hollow structure and the extending part, and further natural heat convection is formed, namely the heat convection cannot be shielded by the bracket and weakened.

Description

light emitting device

technical field

The utility model relates to a light emitting device, in particular to a light emitting device with high heat dissipation efficiency. the

Background technique

Heat sinks are closely related to the development of electronic products. When the electronic product is in operation, the current in the circuit will generate unnecessary heat energy due to the influence of impedance. If the heat energy cannot be effectively removed and accumulated on the electronic components inside the electronic product, the electronic components may be due to rising temperature can cause damage. Therefore, the quality of the cooling device has a great impact on the operation of electronic products. Taking light emitting diodes (light emitting diodes, LEDs) as an example, as the brightness of LEDs continues to increase, the heat generated when they emit light also increases synchronously. In addition, LEDs are usually densely arranged in lighting devices to increase lighting brightness, thus highlighting the importance of heat dissipation of LEDs. Therefore, how to effectively improve the heat dissipation efficiency of the heat dissipation device has become an important research topic. the

Utility model content

The technical problem to be solved by the utility model is: in order to make up for the deficiencies of the prior art, provide a light emitting device with high heat dissipation efficiency to solve the above problems. the

The light emitting device of the present utility model adopts the following technical solutions:

The light emitting device includes a bracket, at least one heat dissipation device and at least one light emitting unit. The bracket has at least one hollow structure. The heat dissipation device includes a heat dissipation body and a plurality of extensions. The heat dissipation body is disposed on the bracket. The plurality of extending parts radially extend from the periphery of the heat dissipation body and are exposed in the hollow structure of the bracket. The light emitting unit is arranged on the heat absorbing end of the heat dissipation body. the

There are multiple gaps between the multiple extending parts, and the heat dissipation body and the multiple gaps do not overlap in a direction perpendicular to the light emitting unit. the

At least part of the gaps communicate with the hollow structure. the

The area of the light-emitting unit is smaller than or equal to the area of the heat-absorbing end. the

A plurality of first joint parts are radially formed around the heat dissipation body, and one end of each extension part has a second joint part, and the second joint part is combined with the first joint part, so that all The plurality of extending portions radially extend from the periphery of the heat dissipation body. the

The heat dissipation body is integrally formed with the plurality of extension parts. the

The heat dissipation body is a heat pipe or a thermostat. the

The heat dissipation body and the plurality of extensions have a horizontal surface area in a direction parallel to the light emitting unit, and the heat dissipation body and the plurality of extensions have a vertical surface area in a direction perpendicular to the light emitting unit. The horizontal surface area is smaller than the vertical surface area. the

The ratio of the vertical surface area to the horizontal surface area is greater than or equal to 10. the

The bracket also has at least one through hole, the heat absorbing end of the heat dissipation body corresponds to the through hole, and the light emitting unit is located in the through hole. the

The plurality of extension parts are divided into at least two groups, and the plurality of extension parts in each group are connected together in a radial manner by connecting parts fixed to the heat dissipation body surroundings, so that the plurality of extensions extend radially from the surroundings of the heat dissipation body. the

Therefore, according to the above-mentioned technical solution, the light-emitting device of the present invention has at least the following advantages and beneficial effects: Since the extension part extends radially from the surrounding of the heat dissipation body, the cold air around the heat dissipation device can directly contact the heat dissipation body for cooling. Heat exchange is not hindered or hindered by the design of the extension. In addition, since the extension is exposed in the hollow structure of the bracket, the hot air at the light-emitting unit can flow in the gap between the hollow structure and the extension, thereby forming natural heat convection, that is, the heat convection will not be blocked by the bracket and weakened . the

Description of drawings

FIG. 1 is a perspective view of a light emitting device according to an embodiment of the present invention. the

Fig. 2 is an exploded view of the light emitting device in Fig. 1 . the

Fig. 3 is a bottom view of the light emitting device in Fig. 1 . the

FIG. 4 is a bottom view of the heat sink in FIG. 1 . the

FIG. 5 is a cross-sectional view of the heat sink in FIG. 4 along line A-A. the

Fig. 6 is a schematic diagram of various shapes of the heat dissipation body. the

FIG. 7 is a cross-sectional view of a heat dissipation device according to another embodiment of the present invention. the

FIG. 8 is a cross-sectional view of a heat dissipation device according to another embodiment of the present invention. the

FIG. 9 is a perspective view of a heat dissipation device according to another embodiment of the present invention. the

FIG. 10 is an exploded view of the heat sink in FIG. 9 . the

Fig. 11 is a perspective view of a heat dissipation device according to another embodiment of the present invention. the

Fig. 12 is a top view of a heat dissipation device according to another embodiment of the present invention. the

Fig. 13 is an exploded view of a light emitting device according to another embodiment of the present invention. the

Among them, the reference signs are explained as follows:

Detailed ways

Please refer to Figures 1 to 5, Figure 1 is a perspective view of a light emitting device 1 according to an embodiment of the present invention, Figure 2 is an exploded view of the light emitting device 1 in Figure 1, and Figure 3 is a bottom view of the light emitting device 1 in Figure 1 4 is a bottom view of the heat sink 12 in FIG. 1 , and FIG. 5 is a cross-sectional view of the heat sink 12 in FIG. 4 along line A-A. As shown in FIGS. 1 to 3 , the light emitting device 1 includes a bracket 10 , at least one heat sink 12 and at least one light emitting unit 14 . The heat dissipation device 12 is used for dissipating heat from the light emitting unit 14 . The light emitting unit 14 may be a light emitting diode or other light emitting devices. the

The bracket 10 has at least one through hole 100 and at least one hollow structure 102 . In this embodiment, the numbers of the heat sink 12 , the light emitting unit 14 and the through holes 100 are the same. As shown in FIGS. 1 to 5 , the heat dissipation device 12 includes a heat dissipation body 120 and a plurality of extensions 122 . The cooling body 120 is disposed on the bracket 10 , and the heat-absorbing end 1200 of the cooling body 120 corresponds to the through hole 100 of the bracket 10 . In practical applications, the heat dissipation body 120 can be disposed on the bracket 10 through welding, welding, gluing, adhesion, tight fitting, screw locking, snapping and other processing methods. The extension portion 122 radially extends from the surrounding of the heat dissipation body 120 and is exposed in the hollow structure 102 of the bracket 10 . The light emitting unit 14 is disposed on the heat absorbing end 1200 of the heat dissipation body 120 and located in the through hole 100 of the bracket 10 , so the light emitted by the light emitting unit 14 can be projected from the through hole 100 . the

The heat dissipation body 120 and the extension part 122 can be made of metal (for example, aluminum, copper, etc.), ceramics, graphite, diamond, or a combination of other high thermal conductivity materials (for example, co-fired metal, co-fired ceramics, composite materials, etc.) or other high Made of thermally conductive material. Preferably, the thermal conductivity of the heat dissipation body 120 and the extension part 122 may be greater than 40W/mK. In this embodiment, the heat dissipation body 120 and the extension part 122 are integrally formed, but not limited thereto. In practical applications, the heat dissipation body 120 and the extension part 122 can be integrally formed through an aluminum extrusion process. In addition, there are multiple gaps 1220 between the extension parts 122, and the heat dissipation body 120 and all the gaps 1220 do not overlap in the direction perpendicular to the light emitting unit 14, such as the Y direction shown in FIG. 2 and FIG. 4 . In addition, as shown in FIG. 3 , at least part of the gap 1220 communicates with the hollow structure 102 of the bracket 10 . the

When the light-emitting unit 14 generates heat, the heat will be quickly conducted upwards from the light-emitting unit 14 through the heat dissipation body 120 in the Y direction, and transmitted outward (X direction) through the extension portion 122 at the same time. Since the gap 1220 between the heat dissipation body 120 and the extension part 122 does not overlap in the direction (Y direction) perpendicular to the light emitting unit 14, and the extension part 122 is exposed in the hollow structure 102 of the bracket 10, the hot air at the light emitting unit 14 can pass through The hollow structure 102 flows upward along the Y direction toward the gap 1220 between the extensions 122 , thereby forming natural heat convection, that is, the heat convection will not be blocked by the bracket 10 and weakened. Since there is no obstacle on the heat convection path, after the hot air flows to the upper end of the heat dissipation body 120 along the Y direction, the cold air will then flow in from the light emitting unit 14 , thereby forming continuous natural convection. Since the extension part 122 extends radially from the surrounding of the heat dissipation body 120, the cold air around the heat dissipation device 12 can directly contact the heat dissipation body 120 for heat exchange without being blocked or hindered by the design of the extension part 122. . In addition, since the extension part 122 is exposed in the hollow structure 102 of the bracket 10, at least part of the gap 1220 communicates with the hollow structure 102 of the bracket 10, and the hot air at the light emitting unit 14 can pass through the hollow structure 102 toward the gap 1220 between the extension parts 122. upward flow, thereby forming natural heat convection, that is, heat convection will not be blocked by the bracket 10 and weakened. the

In this embodiment, the area of the light-emitting unit 14 is smaller than the area of the heat-absorbing end 1200 of the heat dissipation body 120, so that cold air can not only flow into the gap 1220 between the extension parts 122 from around the heat dissipation body 120, but also directly flow from the light-emitting unit 14. The heat flows into the gap 1220 between the extending parts 122 from the bottom to the top, so as to quickly take away the heat. the

In addition, the heat dissipation body 120 and the extension portion 122 have a horizontal surface area in a direction parallel to the light emitting unit 14 (X direction), and the heat dissipation body 120 and the extension portion 122 have a vertical surface area in a direction perpendicular to the light emitting unit 14 (Y direction). In this embodiment, the horizontal surface area is smaller than the vertical surface area. Therefore, when the light-emitting device 1 of the present invention is installed outdoors, it can greatly reduce dust particles or organic matter such as bird droppings remaining on the surface of the heat dissipation body 120 and the extension portion 122 in the X direction, so as to ensure the heat dissipation effect of the heat dissipation device 12 Will not deteriorate with prolonged use. Preferably, the ratio of the vertical surface area to the horizontal surface area may be greater than or equal to 10. For example, the horizontal surface area may be 20.1 cm2 and the vertical surface area may be 1814.4 cm2 such that the ratio of the vertical surface area to the horizontal surface area is about 90.2; the horizontal surface area may be 9.32 cm2 and the vertical surface area may be 1310.4 cm2 such that the vertical surface area is equal to The ratio of horizontal surface areas is about 140.6. It has been proved by experiments that in the case of general natural convection, the larger the ratio of the vertical surface area to the horizontal surface area, the better the heat dissipation effect. the

In this embodiment, the heat dissipation body 120 may be a heat pipe or a thermostat. Therefore, as shown in FIG. 5 , a hollow chamber 1202 is formed in the heat dissipation body 120, which includes a communicating evaporation portion 1204 and a condensation portion 1206. The evaporation part 1204 of the body 120 is combined. In addition, a working fluid 1208 (for example, water) is filled in the evaporation part 1204 . When the heat-absorbing end 1200 absorbs the heat generated by the light-emitting unit 14 , the working fluid 1208 in the evaporation part 1204 will gradually evaporate due to the temperature rise. Then, the vapor flows from the evaporating part 1204 to the condensing part 1206 , and then is cooled by the cold air around the cooling device 12 before being condensed into liquid, thus completing the cooling cycle. Therefore, the overall heat dissipation effect of the heat dissipation device 12 can be further improved. It should be noted that a capillary structure (not shown) may also be formed on the sidewall of the hollow chamber 1202 to enhance the heat dissipation circulation of the working fluid 1208 . In practical applications, the capillary structure may be grooved capillary structure, porous capillary structure, mesh capillary structure, powder sintered capillary structure or composite capillary structure, depending on the actual application. The above composite capillary structure may be composed of at least two capillary structures among grooved capillary structure, porous capillary structure, network capillary structure and powder sintered capillary structure. the

Please refer to FIG. 6 , which is a schematic diagram of various shapes of the heat dissipation body 120 . As shown in FIG. 6 , the cooling body 120 can be in various shapes of cones or columns, depending on the actual application. In addition, the thickness, size, and shape of the extension portion 122 can be designed according to actual applications, and are not limited to the embodiments shown in FIGS. 1 to 4 . the

Please refer to FIG. 7 , which is a cross-sectional view of a heat dissipation device 32 according to another embodiment of the present invention. The main difference between the heat dissipation device 32 and the above-mentioned heat dissipation device 12 is that the heat dissipation body 320 of the heat dissipation device 32 is a solid structure, that is, the heat dissipation body 320 is a solid cylinder, as shown in FIG. 7 . It should be noted that components with the same labels in FIG. 7 as those shown in FIGS. 1 to 5 have roughly the same working principles, and will not be repeated here. the

Please refer to FIG. 8 , which is a cross-sectional view of a heat sink 32 ′ according to another embodiment of the present invention. The main difference between the heat sink 32 ′ and the above heat sink 32 is that the heat sink body 320 ′ of the heat sink 32 ′ includes a partially solid structure and a partially hollow structure, as shown in FIG. 8 . The hollow structure of the heat dissipation body 320' can be used as a vapor chamber to improve the heat dissipation effect, or accommodate other components to expand more other uses. It should be noted that the components with the same labels in FIG. 8 and those shown in FIG. 7 have roughly the same working principles, and will not be repeated here. the

Please refer to FIG. 9 and FIG. 10 , FIG. 9 is a perspective view of a heat sink 42 according to another embodiment of the present invention, and FIG. 10 is an exploded view of the heat sink 42 in FIG. 9 . The main difference between the heat sink 42 and the above heat sink 12 is that a plurality of first joints 4200 are radially formed around the heat sink body 420 of the heat sink 42, and one end of each extension portion 122 has a second The joint part 1222 is shown in FIG. 9 and FIG. 10 . The second combining portion 1222 can be combined with the first combining portion 4200 so that the extending portion 122 extends radially from the surrounding of the heat dissipation body 420 . Therefore, the extension portion 122 with different lengths and areas can be used to increase the heat dissipation area, thereby obtaining a good heat dissipation effect. In this embodiment, the first combining portion 4200 is a groove. In this embodiment, the heat dissipation body 420 can be a heat pipe, a thermostat or a solid cylinder, depending on the actual application. In addition, the shape of the heat dissipation body 420 can also be a cone shape or a column shape as shown in FIG. 6 . In practical applications, the second joint part 1222 of the extension part 122 can be fixed in the groove 4200 through welding, welding, gluing, adhesion, tight fit and other processing methods, so that the second joint part 1222 can be combined with the first joint Section 4200 combined. It should be noted that the components with the same numbers in Figures 9 to 10 and those shown in Figures 1 to 5 have roughly the same working principle, and will not be repeated here. the

Please refer to FIG. 11 , which is a perspective view of a heat sink 42 ′ according to another embodiment of the present invention. The main difference between the heat sink 42 ′ and the above heat sink 42 is that the first joint portion 4200 is a protrusion protruding from the periphery of the heat sink body 420 , and the second joint portion 1222 is a groove formed at one end of the extension portion 122 . In practical applications, the first joint part 4200 of the heat dissipation body 420 can be fixed in the second joint part 1222 of the extension part 122 through welding, welding, gluing, adhesion, tight fitting, etc., so that the second joint The part 1222 is combined with the first combining part 4200 . It should be noted that the components with the same numbers in Fig. 11 and those shown in Figs. the

Please refer to FIG. 12 , which is a top view of a heat sink 52 according to another embodiment of the present invention. The main difference between the heat sink 52 and the above-mentioned heat sink 12 is that the extensions 122 of the heat sink 52 are divided into at least two groups, and the extensions 122 in each group are arranged radially by a connecting portion 124. way connected together. In this embodiment, the extension portion 122 of the heat sink 52 is divided into two groups, as shown in FIG. 12 . However, in another embodiment, the extension portion 122 of the heat sink 52 can also be divided into more than three groups, depending on the actual application. The connecting portion 124 can be fixed around the heat dissipation body 120 through welding, welding, gluing, adhesion, tight fit, screw locking, etc., so that the extension portion 122 extends radially from the surrounding of the heat dissipation body 120 . It should be noted that the components with the same numbers in Fig. 12 as those shown in Figs. 1 to 5 have roughly the same working principles, and will not be repeated here. the

Please refer to FIG. 13 , which is an exploded view of a light emitting device 1 ′ according to another embodiment of the present invention. The main difference between the light-emitting device 1' and the above-mentioned light-emitting device 1 is that when the heat dissipation body 120 of the heat dissipation device 12 of the light-emitting device 1' is arranged on the bracket 10, the condensation between the bracket 10 and the heat dissipation body 120 shown in FIG. Section 1206 is combined. In other words, the heat sink 12 of the light emitting device 1 ′ and the heat sink 12 of the light emitting device 1 are disposed on different sides of the bracket 10 . It should be noted that the components with the same numbers in Fig. 13 as those shown in Figs. 1 to 5 have roughly the same working principles, and will not be repeated here. the

Therefore, according to the above-mentioned technical solution, the light-emitting device of the present invention has at least the following advantages and beneficial effects: Since the extension part extends radially from the surrounding of the heat dissipation body, the cold air around the heat dissipation device can directly contact the heat dissipation body for cooling. Heat exchange is not hindered or hindered by the design of the extension. In addition, since the gap between the heat dissipation body and the extension does not overlap in the direction perpendicular to the heat source, and the extension is exposed in the hollow structure of the bracket, the hot air at the light-emitting unit can flow in the gap between the hollow structure and the extension, thereby Natural heat convection is formed, that is, heat convection will not be blocked by the bracket and weakened. Furthermore, since the horizontal surface area of the heat dissipation body and the extension is smaller than the vertical surface area, when the heat dissipation device of the present invention is installed outdoors, it can greatly reduce dust particles or organic matter such as bird droppings remaining on the surface of the extension to ensure The heat dissipation effect of the heat dissipation device will not deteriorate due to long-term use. The utility model can make the extension part and the heat dissipation body integrally formed according to the actual process requirements, and individually combine the extension part and the heat dissipation body through the joint part, or connect multiple extension parts together with the connection part, and then fix the connection part on the cooling body. In addition, the utility model can combine the bracket with the evaporating part or the condensing part of the heat dissipation body according to the actual process requirements. the

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. the

Claims (11)

1. a light-emitting device is characterized in that, described light-emitting device comprises:

Support has at least one engraved structure;

At least one heat abstractor comprises:

Heat radiator body is arranged on the described support; And

A plurality of extensions extend around the described heat radiator body and are revealed in the described engraved structure in radial mode;

At least one luminescence unit is arranged on the heat absorbing end of described heat radiator body.

2. light-emitting device as claimed in claim 1 is characterized in that, has a plurality of gaps between described a plurality of extensions, and described heat radiator body is not overlapping on the direction of vertical described luminescence unit with described a plurality of gaps.

3. light-emitting device as claimed in claim 2 is characterized in that, at least part of described a plurality of gaps are communicated with described engraved structure.

4. light-emitting device as claimed in claim 1 is characterized in that, the area of described luminescence unit is less than or equal to the area of described heat absorbing end.

5. light-emitting device as claimed in claim 1, it is characterized in that, also comprise a plurality of the first joint portions, described a plurality of the first joint portion is formed at around the described heat radiator body in radial mode, one end of each described extension has respectively the second joint portion, be combined with described the first joint portion in described the second joint portion, so that described a plurality of extension extends around described heat radiator body in radial mode.

6. light-emitting device as claimed in claim 1 is characterized in that, described heat radiator body and described a plurality of extension are one-body molded.

7. light-emitting device as claimed in claim 1 is characterized in that, described heat radiator body is heat pipe or samming device.

8. light-emitting device as claimed in claim 1, it is characterized in that, described heat radiator body has horizontal surface area with described a plurality of extensions on the direction of parallel described luminescence unit, described heat radiator body has vertical surface area with described a plurality of extensions on the direction of vertical described luminescence unit, described horizontal surface area is less than described vertical surface area.

9. light-emitting device as claimed in claim 8 is characterized in that, the ratio of described vertical surface area and described horizontal surface area is more than or equal to 10.

10. light-emitting device as claimed in claim 1 is characterized in that, described support also has at least one through hole, and the heat absorbing end of described heat radiator body is corresponding with described through hole, and described luminescence unit is arranged in described through hole.

11. light-emitting device as claimed in claim 1, it is characterized in that, described a plurality of extension is divided at least two groups, described a plurality of extensions in each described group link together in radial mode by connecting portion respectively, described connecting portion is fixed in around the described heat radiator body, so that described a plurality of extension extends around described heat radiator body in radial mode.

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