TWI416045B - Led lamp - Google Patents

Abstract

An LED lamp includes a housing, a substrate including a plurality of LEDs, a connector and a circuit board. The LED lamp further includes a base, the substrate is fixed on the top of the base, and the circuit board is received in the base. The base is received in the housing. The housing and the top of the base corporately defines a plurality of air-guiding holes, each of the holes communicate with its adjacent holes. An inner flow field is formed between the housing and the base for air-guiding holes.

Description

LED lighting

The invention relates to an LED lighting fixture, in particular to an LED lighting fixture with a heat dissipation structure.

Compared with traditional light sources, light-emitting diodes (LEDs) have higher luminous efficiency (light source temperature is lower than general bulbs), low radiation, low power consumption, long life, low voltage, fast start-up, environmental protection, anti-seismic compression, Lighting fixtures can be miniaturized. Lighting devices using LEDs as light sources are currently used in a variety of lighting applications, such as indoor lighting, outdoor lighting, portable lighting (such as flashlights), and ambient lighting. The LED generates heat during operation, and the heat between the air with the heat and the air in the surrounding environment dissipates heat, but the heat dissipation method has limited effect, especially after the LED is used for a long time, the heat dissipation method alone cannot be used. The generated heat is evacuated in time, which causes the LED temperature to rise, which seriously affects the luminous efficiency of the LED and the service life of the LED lamp.

In order to solve the problem of heat dissipation of LED lamps, in the prior art, heat-dissipating fins are added to the lamp housing. Although this method effectively increases the heat dissipation area, it increases the volume and weight of the LED lamps, and the fin spacing is too small. It can cause dust impurities and the like to deposit in the fin gap, resulting in a decrease in heat dissipation capability.

In view of this, the present invention provides an LED lighting fixture that is lightweight and has good heat dissipation.

An LED lighting fixture includes a heat dissipation housing, an LED substrate, a driving circuit board, and a power connector, and the LED substrate is provided with a plurality of light emitting diodes. The LED lighting fixture further includes a heat dissipation base, the LED substrate is fixed on the top of the heat dissipation base, and the driving circuit board is received at the bottom of the heat dissipation base. The heat dissipation housing is a hollow housing that is open at both ends, and one end of the heat dissipation housing is connected to the power connector, the other end is fixed to the top of the heat dissipation base, and the heat dissipation base is accommodated inside the heat dissipation housing. The heat dissipation base top and the heat dissipation housing are provided with flow guiding holes that communicate with each other.

When the LED lighting device is working, the air guiding hole formed on the top of the heat dissipating base and the heat dissipating housing forms an internal flow field between the heat dissipating housing and the heat dissipating base, and the cold air enters from the diversion hole opened in the heat dissipating housing to dissipate heat. The diversion hole opened on the base is discharged. The cold air can exchange heat with the bottom of the heat dissipation base and the inner side wall of the heat dissipation housing, thereby effectively improving the heat dissipation efficiency. Since the heat dissipation housing and the heat dissipation base simultaneously dissipate heat, during the operation of the LED lighting fixture, the temperature of the surface of the heat dissipation housing is low, and the user inadvertently touches the LED lighting fixture and is not damaged by the overheating of the heat dissipation housing.

100‧‧‧LED lighting

10‧‧‧shade

20‧‧‧heating base

21‧‧‧ top

22‧‧‧ bottom

23‧‧‧ recess

24‧‧‧ Housing

25‧‧‧ Back cover

26‧‧‧ Heat sink fins

30‧‧‧Solid housing

31‧‧‧First opening

32‧‧‧second opening

40‧‧‧Power connector

50‧‧‧LED substrate

51‧‧‧Lighting diode

52‧‧‧ screws

60‧‧‧Drive Circuit Board

71‧‧‧First diversion hole

72‧‧‧Second diversion hole

1 is a perspective view of an LED lighting fixture in accordance with an embodiment of the present invention.

2 is an exploded view of the LED lighting fixture of FIG. 1.

3 is a schematic structural view of a heat dissipation base of the LED lighting fixture of FIG. 1.

4 is a schematic structural view of a heat dissipation housing of the LED lighting fixture of FIG. 1.

FIG. 5 is a schematic diagram of a heat dissipation mode of the LED lighting fixture of FIG. 1. FIG.

Referring to FIG. 1 , the LED lighting fixture 100 includes a lampshade 10 , a heat dissipation base 20 , and a heat dissipation shell . Body 30 and power connector 40. The lamp cover 10 is fixed on the heat dissipation base 20, and the heat dissipation base 20 and the power connector 40 are respectively fixed at both ends of the heat dissipation housing 30. The power connector 40 is used to connect to a power source, and the power connector 40 is a universal power interface such as a screw power connector or a bayonet power connector.

Referring to FIG. 2, the LED lighting fixture 100 further includes an LED substrate 50 and a driving circuit board 60. A plurality of light emitting diodes 51 are also mounted on the LED substrate 50. The driving circuit board 60 is electrically connected to the power connector 40 and the LED substrate 50, and the driving circuit board 60 obtains electric energy from the outside through the power connector 40 to drive the light emitting diode 51 to emit light.

The lamp cover 10 is fixed to one end of the heat dissipation base 20, and the light emitted from the light-emitting diode 51 is emitted through the lamp cover 10 to the outside of the LED lighting device 100. The lampshade 10 can be fixed to the heat dissipation base 20 by a screw connection, a mechanical snap, an adhesive or the like. In the present embodiment, the lampshade 10 uses a transparent plastic as a substrate, and mixes light diffusion particles in an appropriate ratio therein to increase the light scattering effect and soften the light. In other embodiments, a rough surface may be provided on the inner surface of the lampshade 10 to increase the light diffusing scattering effect of the lampshade.

Referring to FIG. 3 together, the top portion 21 of the heat dissipation base 20 has a disk shape, and the upper surface of the disk is formed with a recess 23, and the LED substrate 50 is fixed in the recess 23. In the present embodiment, the LED substrate 50 is fixed in the recess 23 by a screw 52. Preferably, a heat conducting medium (not shown) is disposed between the LED substrate 50 and the top portion 21 of the heat dissipation base 20 for uniformly conducting heat emitted by the LED substrate 50 to the heat dissipation base 20. In the present embodiment, the heat transfer medium between the LED substrate 50 and the top portion 21 of the heat sink base 20 is one of a graphite heat conductive sheet, a heat conductive tape, or a ceramic heat conductive plate. The edge of the top portion 21 of the heat dissipation base 20 is provided with at least one first flow guiding hole 71.

The bottom portion 22 of the heat dissipation base 20 is provided with a receiving portion 24 in which the driving circuit board 60 is housed. In the present embodiment, a rear cover 25 is also fastened to the accommodating portion 24, and the rear cover 25 seals the driving circuit board 60 in the accommodating portion 24 to improve the airtightness and watertightness of the LED lighting device 100. The back cover 25 can be snap-fitted onto the receiving portion 24 in an adhesive manner. The bottom portion 22 of the heat dissipation base 20 is further provided with a plurality of heat dissipation fins 26 spaced apart from each other by a distance, and the heat dissipation fins 26 are disposed opposite to the receiving portion 24 at the bottom of the heat dissipation base 20. The heat dissipation fins 26 are used to increase the surface area of the heat dissipation base 20, thereby increasing the contact area with the air, thereby improving the heat dissipation efficiency.

In the present embodiment, the heat dissipation base 20 is made of a heat-dissipating heat-dissipating material, such as an aluminum alloy, and the receiving portion 24 is filled with a heat-conducting material for conducting heat radiated from the driving circuit board 60 to the heat-dissipating fins. 26 is distributed to the outside. The heat radiated by the LED substrate 50 is conducted to the heat dissipation base 20 via the heat conductive medium, and then conducted to the heat dissipation fins 26 for dissipation.

Referring to FIG. 2 and FIG. 4 together, the heat dissipating housing 30 is a hollow shell which is open at both ends, and is made of a heat dissipating material having good thermal conductivity, such as an aluminum alloy. The heat dissipation housing 30 includes a first opening portion 31 and a second opening portion 32 that are oppositely disposed. The heat dissipation housing 30 is screwed to the top of the heat dissipation base 20 at the first opening portion 31, and the heat dissipation base 20 is housed inside the heat dissipation housing 30. The heat dissipation base 20 and the heat dissipation housing 30 are fixed by screws, so that the contact area between the heat dissipation base 20 and the heat dissipation housing 30 can be increased, and the heat dissipation speed can be accelerated. At the screw joint of the heat dissipation base 20 and the heat dissipation housing 30, a thermal conductive adhesive or other heat conductive medium may be further filled to further improve the air thermal resistance between the gaps. The second opening portion 32 of the heat dissipation housing 30 is fixed to the power connector 40. The heat dissipation housing 30 is provided with at least one second flow guiding hole 72 at the second opening portion 32. The second air guiding hole 72 and the first air guiding hole 71 are connected to each other.

Referring to FIG. 5 , when the LED lighting fixture 100 is in operation, the heat generated by the LEDs 51 is conducted to the top of the heat dissipation base 20 via the heat conductive medium, and then radiated from the top of the heat dissipation base 20 to the heat dissipation housing 30 and the heat dissipation fins at the bottom of the heat dissipation base 20 . Sheet 26. The heat conducted to the heat dissipation case 30 is directly exchanged with the air to dissipate heat. The first air guiding hole 71 at the top of the heat dissipation base 20 and the second air guiding hole 72 of the second opening portion 32 of the heat dissipation housing 30 form an internal flow field between the heat dissipation housing 30 and the heat dissipation base 20, and the cold air is emitted from the far side. The second air guiding hole 72 of the diode 51 enters and is discharged from the first air guiding hole 71. The cold air entering from the first air guiding hole 71 can exchange heat between the heat dissipation fins 26 and the inner side walls of the heat dissipation housing 30, thereby effectively improving heat dissipation efficiency. Since the heat dissipation housing 30 and the heat dissipation base 20 simultaneously dissipate heat, during the operation of the LED lighting fixture 100, the temperature of the surface of the heat dissipation housing 30 is low, and the user inadvertently touches the LED lighting fixture 100 without the heat dissipation housing 30. Overheating is hurt.

It is to be understood by those skilled in the art that the above embodiments are only intended to illustrate the invention, and are not intended to limit the invention, as long as it is within the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.

10‧‧‧shade

20‧‧‧heating base

21‧‧‧ top

22‧‧‧ bottom

23‧‧‧ recess

25‧‧‧ Back cover

26‧‧‧ Heat sink fins

30‧‧‧Solid housing

31‧‧‧First opening

32‧‧‧second opening

40‧‧‧Power connector

50‧‧‧LED substrate

51‧‧‧Lighting diode

52‧‧‧ screws

60‧‧‧Drive Circuit Board

71‧‧‧First diversion hole

Claims (7)

An LED lighting fixture includes a heat dissipating housing, an LED substrate, a driving circuit board, and a power connector. The LED substrate is provided with a plurality of light emitting diodes, and the improvement thereof comprises: a heat dissipating base, wherein the LED substrate is fixed The bottom of the heat dissipation base is provided with a receiving portion at the bottom of the heat dissipation base, and the driving circuit board is received in the receiving portion, and at least one first guiding hole is disposed at an edge of the top of the heat dissipation base, and the bottom of the heat dissipation base is further disposed at a distance from each other. a plurality of heat dissipating fins disposed at a bottom of the heat dissipating base opposite to the receiving portion; the heat dissipating housing is a hollow shell that is open at both ends, and the heat dissipating housing includes a first opening portion opposite to the receiving portion a second opening portion, the second opening portion of the heat dissipation housing is connected to the power connector, the first opening portion is fixed to the top of the heat dissipation base, the heat dissipation base is received in the heat dissipation housing, and the heat dissipation housing is in the second opening At least one second guiding hole is disposed at the portion; the second guiding hole and the first guiding hole communicate with each other to form an internal flow field between the heat dissipation housing and the heat dissipation base The LED lighting fixture of claim 1, wherein the top of the heat dissipation base has a disk shape, and the upper surface of the disk is formed with a recess, and the LED substrate is fixed in the recess. The LED lighting fixture of claim 2, wherein a heat conductive medium is disposed between the LED substrate and the heat dissipation base, and heat generated by the LED substrate is conducted to the heat dissipation base via the heat conductive medium. The LED lighting fixture of claim 3, wherein the heat conducting medium is one of a graphite heat conducting sheet, a heat conducting tape or a ceramic heat conducting plate. The LED lighting fixture of claim 1, wherein the receiving portion further engages a rear cover, and the rear cover seals the driving circuit board in the receiving portion. The LED lighting fixture of claim 1, wherein the heat dissipation housing is screwed to the top of the heat dissipation base. The LED lighting fixture of claim 1, wherein the threaded joint of the top of the heat dissipating base and the heat dissipating housing is filled with a heat conducting medium.