CN205026425U - LED bulb lamp - Google Patents

Abstract

An LED bulb lamp includes a lampshade, a power connection base, an LED light-emitting module, a heat sink and a power conversion module. The top of the heat dissipation base is connected to the lower edge of the lampshade, and an LED carrier is provided in the center of the top to carry the LED light-emitting module, and the bottom is connected to the power connection base. The heat dissipation base has an annular side wall, and an internal space that can accommodate the power conversion module is formed inside the annular side wall. The annular side wall includes a plurality of perforations, the first opening of each perforation is connected to the internal space formed by the lampshade, and the second opening is connected to the outside of the LED bulb. This utility model utilizes the perforations with convection function in the heat sink to dissipate the heat in the inner space of the lampshade to the outside of the LED bulb. It can also be used with polymer thermal conductive sheets to fix the LED light-emitting module to increase heat conduction. The utility model utilizes the dual functions of heat convection and heat conduction to improve the luminous efficiency of the LED light-emitting module and extend its service life.

Description

LED Bulb

technical field

The utility model relates to a bulb structure, in particular to a light emitting diode (LED) bulb lamp.

Background technique

Commonly used LED light bulbs are mainly provided with a plurality of LED chips on an aluminum circuit board, and then the circuit board is combined on a heat conducting plate usually made of aluminum. Afterwards, the heat conduction plate is assembled on one end of a heat dissipation base made of aluminum, and the side of the heat conduction plate opposite to the heat dissipation base is combined with a lampshade, so that the circuit board and the plurality of LED chips are covered therein. The other end of the cooling base is combined with a power connection base, which can be installed on a light bulb power base, and a power drive circuit module is provided in the cooling base for electrical connection with the power connection base and the circuit board. In this way, the high heat generated when the LED chip emits light can be conducted to the heat conducting plate made of aluminum through the circuit board made of aluminum, and then conducted to the heat sink made of aluminum through the heat conducting plate made of aluminum. Usually, a plurality of heat dissipation fins can be arranged on the side wall of the heat dissipation seat, and the heat dissipation grooves therebetween can dissipate heat into the surrounding air to achieve a cooling effect.

However, the commonly used LED light bulbs have the following disadvantages in actual production and use: 1. The heat generated by the LED chip needs to pass through the circuit board, the heat conducting plate and the heat sink before it can be dissipated into the outside air. The thermal resistance formed by the circuit board, the heat conduction plate and the heat sink lowers the heat conduction efficiency of the LED chip, thereby affecting its heat dissipation effect. Moreover, the hot air inside the heat sink is difficult to discharge, which greatly reduces the overall heat dissipation effect. 2. If there are too many gaps or poor bonding interface between the circuit board and the heat conduction plate and between the heat conduction plate and the heat sink, the heat conduction effect will be greatly reduced.

In view of the development trend of high-power LEDs for lighting applications, high-power LEDs will further increase the specification requirements for heat conduction, and poor design or assembly will affect the luminous efficiency of LED bulbs and even affect their service life. Therefore, how to improve the heat conduction efficiency is an inevitable key direction for recent development.

Utility model content

In order to improve the heat dissipation efficiency of LED bulb lamps, especially for high-power LED lighting applications, the utility model provides an LED bulb lamp with a convection cooling mechanism heatsink, which can effectively dissipate the heat generated by the LED chip and improve Luminous efficiency and service life.

The LED bulb lamp according to an embodiment of the present invention includes a lampshade, a power connection seat, an LED light emitting module, a heat sink and a power conversion module. The top of the cooling seat is connected to the lower edge of the lampshade, and the center of the top is provided with an LED carrier for carrying the LED light emitting module, and the bottom is connected to the power connection seat. The heat sink has an annular side wall, and the inner space of the annular side wall can accommodate the power conversion module. The ring-shaped side wall contains a plurality of perforations, the first opening of each perforation communicates with the inner space formed by the lampshade, and the second opening communicates with the outside of the LED bulb lamp, thereby generating a convective heat dissipation effect.

In one embodiment, an outer flange is further provided above the heat sink, and an annular groove is provided between the outer flange and the LED carrier, and the first opening is disposed in the annular groove.

In one embodiment, the lower edge of the lampshade is embedded in the inner wall of the outer flange of the heat sink, and the lower edge of the lampshade is disposed outside the first opening.

In one embodiment, a plurality of through holes are arranged around the LED carrier.

In one embodiment, the second opening is located at the bottom of the heat sink to achieve better convection efficiency.

In one embodiment, the second opening is located at the side of the lower half of the heat sink to achieve better convection efficiency.

In one embodiment, the through hole has an aspect ratio greater than 10.

In one embodiment, the diameter of the through hole remains unchanged from the first opening to the second opening.

In one embodiment, the through hole includes two different diameters, and the diameter of the hole near the first opening is larger than the diameter of the hole near the second opening.

In one embodiment, the heat sink is integrally formed.

In one embodiment, the through holes in the heat sink can be made by mechanical drilling.

In one embodiment, the through hole has a diameter of 0.2 to 3 mm.

In one embodiment, the LED light-emitting module can be fixed on the heat sink by using a polymer heat conduction sheet, which has adhesiveness, so it can be fixed without screws, thereby further combining the heat conduction mechanism to improve the heat dissipation effect.

In one embodiment, the thermal conductivity of the polymer thermal conductive sheet is greater than or equal to 2W/m·K.

In one embodiment, a water-absorbing and breathable material, such as silica gel, can be arranged in the perforation, so as to prevent water vapor from entering.

The utility model utilizes the perforation with convection function designed in the cooling seat, which can dissipate the heat in the inner space of the lampshade to the outside of the LED bulb lamp. In addition, the LED light-emitting module can also be fixed with a polymer heat-conducting sheet to increase heat conduction. Therefore, the utility model can utilize the dual effects of heat convection and heat conduction to achieve the best heat dissipation effect, thereby improving the luminous efficiency of the LED light emitting module and prolonging its service life.

Description of drawings

FIG. 1 is a three-dimensional exploded schematic view of the LED bulb lamp of the first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional structure diagram of the LED bulb lamp according to the first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the heat sink of the LED bulb lamp according to the first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of the LED bulb lamp according to the second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional structure diagram of an LED bulb lamp according to a third embodiment of the present invention.

6A to 6C are structural schematic diagrams of different heat sinks of the present invention.

Wherein, the reference signs are explained as follows:

10, 20, 30 LED bulbs

11 shade

12, 61, 62, 63 heat sink

13 power connector

14LED lighting module

15 power conversion module

16 Polymer heat conducting sheet

65 ring groove

111 lower edge

121 outer flange

122LED carrier

123 openings

124, 134, 144, 611, 621, 631 perforations

125, 135, 145, 612, 622, 632 first opening

126, 136, 146, 613, 623, 633 second opening

127 ring groove

128 ring side wall

151 wire

detailed description

In order to make the above and other technical contents, features and advantages of the present invention more comprehensible, relevant embodiments are specifically cited below, together with the accompanying drawings, for detailed description as follows.

1 and 2 are schematic diagrams of the LED bulb lamp according to the first embodiment of the present invention, wherein FIG. 1 is a three-dimensional exploded view, and FIG. 2 is a cross-sectional structural schematic diagram. The LED bulb lamp 10 mainly includes a lampshade 11 , an LED lighting module 14 , a heat sink 12 , a power conversion module 15 and a power connection seat 13 . The lower edge 111 of the lampshade 11 is connected to the heat sink 12 to form an inner space for accommodating the LED lighting module 14 . The power connection socket 13 is connected to the bottom of the heat sink 12 to provide power for the LED lighting module 14 . An LED carrier 122 is disposed at the center above the heat sink 12 for carrying the LED light emitting module 14 . The heat sink 12 has an opening facing downwards, and includes a hollow chamber therein for accommodating the power conversion module 15 . The LED carrier 122 of the heat sink 12 is provided with an opening 123 for allowing the wire 151 of the power conversion module 15 to pass through to be connected to the LED lighting module 14 . The power conversion module 15 is connected to the power connection socket 13 to form a conductive path.

FIG. 3 is a schematic perspective view of the appearance of the heat sink 12 of the first embodiment. The heat sink 12 is substantially a cylindrical structure, and the diameter of the upper half may be slightly larger than that of the lower half. The surface of the LED carrier 122 can carry the LED lighting module 14 including LED chips. The heat sink 12 has a ring-shaped side wall 128 , which forms an inner space for accommodating the power conversion module 15 . The ring-shaped side wall 128 includes a plurality of vertical through holes 124 . The first opening 125 of each through hole 124 communicates with the inner space formed by the lampshade 11 and the heat sink 12 , while the second opening 126 communicates with the outside of the LED bulb lamp 10 . Through this structural design, a convection channel from the inside of the lampshade 11 to the outside is formed, and the LED bulb lamp 10 is used upside down. According to the principle of hot air upward, the heat or hot air generated by the LED chip light can be quickly Convection or dissipation to the outside can effectively improve the heat dissipation effect.

In particular, in this embodiment, an outer flange 121 is disposed above the heat sink 12 , and an annular groove 127 is formed between the outer flange 121 and the LED carrier 122 . The first opening 125 of the through hole 124 is disposed in the annular groove 127 , or can be regarded as disposed on the surface of the annular groove 127 . A plurality of through holes 124 are arranged around the LED carrier 122 , which can be arranged at equal angles or non-equal angles, depending on requirements. The lower edge 111 of the lampshade 11 is embedded in the inner wall of the outer flange 121 of the heat sink 12, and the lower edge 111 of the lampshade 11 is arranged around the outer side of the first opening 125, so that the perforation 124 can communicate with the opening formed by the lampshade 11 and the heat sink 12. The interior space provides convection ducts. The heat sink 12 can be integrally formed, wherein the through hole 124 can be made by mechanical drilling, and the linear through hole can be easily processed by mechanical drilling.

In one embodiment, the LED light-emitting module 14 can be fixed on the surface of the LED carrier 122 by the polymer heat-conducting sheet 16 disposed thereunder. Such a design does not require mechanical parts such as screws to be fixed in the traditional way, the assembly is simple, and the heat conduction effect can be further increased. The thermal conductivity of the polymer thermal conductive sheet 16 is preferably greater than 2W/m·K, and may also be greater than 4W/m·K or 8W/m·K.

Referring to FIG. 2 again, the second opening 126 of the through hole 124 is located at the bottom of the heat sink 12 in this embodiment. That is, the through hole 124 is vertically penetrating from the first opening 125 to the second opening 126 , wherein the aspect ratio of the through hole 124 is preferably greater than 10. The aperture size of the through hole 124 remains unchanged from the first opening 125 to the second opening 126. The aperture size of the through hole 124 must match the size of the heat sink 12. There is no special limitation, but it is preferably 0.2 to 3mm, such as 0.5mm, 1mm, 2mm. The perforation 124 can be circular, elliptical, square or polygonal (eg triangular). In one embodiment, the perforations 124 can be filled with water-absorbing and breathable materials, such as but not limited to porous or granular materials such as silica gel or alumina, so as to prevent water vapor from entering, but still maintain the convection effect.

In order to achieve a better convection effect, different perforated structures can also be designed. The LED bulb lamp 20 of the second embodiment as shown in FIG. . The perforation 134 includes two different apertures, the aperture close to the first opening 135 is larger than the aperture close to the second opening 136, so the first opening 135 connected to the internal space formed by the lampshade 11 and the heat sink 12 is larger, allowing more Hot air circulates for enhanced convection.

FIG. 5 is a schematic diagram of an LED bulb lamp 30 according to a third embodiment of the present invention. The difference from the first embodiment is only the design of the through hole 144 in the heat sink 12 . The second opening 146 is located on the annular sidewall 128 of the heat sink 12 and is located at the lower half of the heat sink 12 . Specifically, the through hole 144 extends vertically downward from the first opening 145, and turns to extend after about half of the height of the heat sink 12 and passes through the annular side wall 128 of the heat sink 12 to form a The second opening 146 on the side.

According to the principle of convection, the heat flux of convection is directly proportional to the temperature difference, so the utility model preferably arranges the second opening 126, 136 or 146 on the lower half of the heat sink 12, so that the first opening 125, 135 or 145 and There is a larger temperature difference or temperature gradient between the second openings 126 , 136 or 146 (external environment) (generally, the farther away from the LED chip, the lower the temperature), so the convection effect can be improved. Therefore, when the second opening 126 , 136 or 146 is located at the lower half of the heat sink, or at the lower third of the height of the heat sink 12 , a better heat dissipation effect will be obtained.

Referring to Figures 6A to 6C, which are designed for different heat sink structures, the temperature measurement of the LED light-emitting module (circuit board) and the heat sink shell of the 8W/800 lumen bulb lamp is carried out, and the results are shown in Table 1 below. In FIG. 6A , the first opening 612 of the through hole 611 of the heat sink 61 is located in the annular groove 65 , and the second opening 613 is located in the upper half of the heat sink 61 . The perforation 611 is an oblique linear perforation. In FIG. 6B , the first opening 622 of the through hole 621 of the heat sink 62 is located in the annular groove 65 , and the second opening 623 is located at the lower half or about the lower third of the heat sink 62 . The perforation 621 is an oblique linear perforation. In FIG. 6C , the first opening 632 of the through hole 631 of the heat sink 63 is located in the annular groove 65 , and the second opening 633 is located at the bottom of the heat sink 63 . The perforation 631 is a vertical linear perforation. In the utility model, the perforation can also be made as a non-linear perforation with curved angles as shown in FIG. 5 in addition to the straight line.

Table 1

According to the test results in Table 1, when the second opening is located at the lower half of the heat sink or at the lower third of the height of the heat sink, both the LED light-emitting module and the lamp housing have a lower temperature, which shows that when the heat sink When the position of the second opening (lower opening) is lower or the perforation is longer, it can effectively provide heat dissipation and cooling effects.

The perforations that provide convection and heat dissipation shown in the above embodiments are only examples and are not limitations of the present invention. For example, other non-perpendicular inclined straight or non-linear perforation designs, such as non-linear perforations with curved corners as shown in Figure 5, or other Various modifications are also covered by the protection scope of the present utility model.

The convection perforation design of the special heat sink of the utility model can quickly dissipate the heat generated by the LED chip by convection, and even have the opportunity to replace the traditional heat dissipation fin design to simplify the structure and improve the processability. Furthermore, the utility model can use high thermal conductivity polymer heat conduction sheets to fix the LED light-emitting module without screws. In addition to simplifying the structure, it can also further use heat conduction to increase heat dissipation efficiency. Because the LED bulb lamp of the utility model has a very good heat dissipation effect, it can indirectly improve the luminous efficiency of the LED chip and prolong its service life.

The technical content and technical features of the present utility model have been disclosed above, but those skilled in the art can still make various replacements and modifications without departing from the spirit of the present utility model based on the disclosure and teaching of the present utility model. Therefore, the protection scope of the utility model should not be limited to the disclosed embodiments, but should include various replacements and modifications that do not deviate from the utility model, and are covered by the following claims.

Claims (14)

1. An LED bulb lamp, characterized in that it comprises: a lampshade; a power connection socket; One LED lighting module; A heat sink, the top of which is connected to the lower edge of the lampshade, the center of the top is provided with an LED carrier for carrying the LED light-emitting module, and the bottom is connected to the power connection seat; A power conversion module; Wherein the heat sink has a ring-shaped side wall, the inner space of which can accommodate the power conversion module is formed inside the ring-shaped side wall, the ring-shaped side wall contains a plurality of perforations, and the first opening of each perforation communicates with the first opening formed by the lampshade. The inner space, and the second opening communicates with the outside of the LED bulb lamp. 2. The LED bulb lamp according to claim 1, wherein an outer flange is provided above the heat sink, and an annular groove is formed between the outer flange and the LED carrier, and the first opening is set in the annular groove. 3 . The LED bulb lamp according to claim 2 , wherein the lower edge of the lampshade is embedded in the inner wall of the outer flange of the heat sink, and the lower edge of the lampshade is disposed outside the first opening. 4 . 4. The LED bulb lamp according to claim 1, wherein the plurality of perforations are arranged around the LED carrier. 5. The LED bulb lamp according to claim 1, wherein the second opening is located at the bottom of the heat sink. 6 . The LED bulb lamp according to claim 1 , wherein the second opening is located at the side of the heat sink and is located at the lower half of the heat sink. 7 . 7. The LED bulb lamp according to claim 1, characterized in that, the aspect ratio of the perforated holes is greater than 10. 8 . The LED bulb lamp according to claim 1 , wherein the diameter of the perforation remains unchanged from the first opening to the second opening. 9 . The LED bulb lamp according to claim 1 , wherein the through hole comprises two different apertures, and the aperture close to the first opening is larger than the aperture close to the second opening. 10. The LED bulb lamp according to claim 1, characterized in that the heat dissipation seat is integrally formed. 11. The LED bulb lamp according to claim 1, characterized in that, the diameter of the perforation is 0.2 to 3mm. 12. The LED bulb lamp according to claim 1, further comprising a thermally conductive polymer sheet for fixing the LED light emitting module to the heat sink. 13. The LED bulb lamp according to claim 12, characterized in that, the thermal conductivity of the polymer heat conducting sheet is greater than or equal to 2W/m·K. 14. The LED bulb lamp according to claim 1, characterized in that, the perforation is filled with water-absorbing and breathable material, so as to prevent water vapor from entering.