LED Lamp With Heat Dissipation Effect

• US 20180283674A1
• Filed: 03/26/2018
• Published: 10/04/2018
• Est. Priority Date: 03/31/2017
• Status: Active Grant

• Current Assignee: Liquidleds Lighting Corp.
• Original Assignee: Liquidleds Lighting Corp.
• Inventors: Huang, David
• Granted Patent: US 10,619,798 B2
• Time in Patent Office: Days
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• CPC Class Codes: F21S 10/002 using liquids, e.g. water
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 19/001 the light sources being semiconductors devices, e.g. LEDs
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/56 using liquid coolants F21V29/51 takes precedence
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 9/00 Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters coloured shades F21V1/00; elements characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

An LED lamp with a heat dissipation effect has an LED device and a lamp base. The LED device has a light bar and a protective cover, wherein the light bar is formed by LED chips arranged on a plurality of conductive substrates at intervals and a packaging layer covering the LED chips. The protective cover covers the light bar and is filled with cooling liquid inside. The cooling liquid is in contact with the light bar for cooling. The heat generated by the LED chips is conducted to the protective cover by the cooling liquid, and then distributed to the air, thereby improving heat dissipation.

Claims

1. A light emitting diode (LED) lamp with a heat dissipation effect, the LED lamp comprising:

a light bar having multiple conductive substrates and multiple LED chips arranged on the conductive substrates, wherein each LED chip is a double-sided light-emitting flip chip that is hosted and electrically connected by two adjacent said conductive substrates, and an upper surface and a lower surface of each of the LED chips are respectively covered with a packaging layer, wherein the light bar has at least one wire connected to the conductive substrates;

a protective cover comprising an insulative light-transmitting tube, wherein the light-transmitting tube is a plastic tube made by extrusion molding and covers the light bar;

cooling liquid being translucent and insulating, wherein the cooling liquid is filled into the protective cover and contacts the light bar;

sealing elements disposed in the protective cover to prevent the cooling liquid from leaking out, wherein each of the at least one wire of the light bar passes through a respective one of the sealing elements;

a fixing block, wherein an end of the light bar covered with the protective cover and filled with the cooling liquid is fixed to the fixing block, a circuit board is disposed inside the fixing block, and the circuit board is electrically connected to the at least one wire of the light bar; and

a lamp base mounted to the fixing block and electrically connected to the circuit board, wherein the lamp base is adapted to connect an external power source.

2. The LED lamp as claimed in claim 1, wherein the sealing elements are respectively provided at two ends of the light-transmitting tube.

3. The LED lamp as claimed in claim 1, wherein the protective cover further includes at least one heat-dissipating tube, the at least one heat-dissipating tube is hollow, is connected to and communicates with the light-transmitting tube, and the cooling liquid flows in the at least one heat-dissipating tube and the light-transmitting tube.

4. The LED lamp as claimed in claim 2, wherein the protective cover further includes at least one heat-dissipating tube, the at least one heat-dissipating tube is hollow, is connected to and communicates with the light-transmitting tube, and the cooling liquid flows in the at least one heat-dissipating tube and the light-transmitting tube.

5. The LED lamp as claimed in claim 3, wherein each of the at least one heat-dissipating tube is a metal tube.

6. The LED lamp as claimed in claim 4, wherein each of the at least one heat-dissipating tube is a metal tube.

7. The LED lamp as claimed in claim 5, wherein the at least one heat-dissipating tube includes two heat-dissipating tubes which are respectively connected with the two ends of the light-transmitting tube, and the sealing elements are provided at an end of each heat-dissipating tube.

8. The LED lamp as claimed in claim 6, wherein the at least one heat-dissipating tube includes two heat-dissipating tubes which are respectively connected with the two ends of the light-transmitting tube, and the sealing elements are provided at an end of each heat-dissipating tube.

9. The LED lamp as claimed in claim 7, wherein each of the sealing elements is an annular block, a hollow sleeve or a hardened adhesive.

10. The LED lamp as claimed in claim 8, wherein each of the sealing elements is an annular block, a hollow sleeve or a hardened adhesive.

11. The LED lamp as claimed in claim 1, wherein the light bar covered with the protective cover has a shape of a circle, a pear, a heart, an oval, a triangle, a trapezoid, a diamond, a sword or a Tai Chi symbol.

12. The LED lamp as claimed in claim 7, wherein the light bar covered with the protective cover has a shape of a semi-circle, a half-pear, a semi-heart, a semi-oval, a semi-triangle, a semi-trapezoid, a semi-diamond or a semi-sword.

13. The LED lamp as claimed in claim 1, wherein a pigment is added in the cooling liquid.

14. The LED lamp as claimed in claim 1, wherein reflective particles is added in the cooling liquid.