LED lamp with a lower end located under base of heat sink

• US 10,619,840 B2
• Filed: 06/05/2019
• Issued: 04/14/2020
• Est. Priority Date: 02/08/2018
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Jiang, Tao, Wang, Mingbin, Xiong, Aiming, Zhou, Lin
• Primary Examiner(s): Alavi, Ali
• Application Number:
  US16/432,893
• Publication Number:
  US 20190285263A1
• Time in Patent Office: 314 Days
• Field of Search: 362294
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• 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: F21K 9/237 Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases F21K9/238 takes precedence
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/66 Details of globes or covers forming part of the light source
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/508 of electrical circuits
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2105/18 annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H03H 11/04 Frequency selective two-port networks
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 45/56 : involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/00 : Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An LED lamp includes: a lamp shell including a lamp head, a lamp neck and a sleeve, the lamp head connects to the lamp neck which connects to the sleeve; a passive heat dissipating element having a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base; a power source; a light emitting surface; a first heat dissipating channel formed in a first chamber of the lamp shell; a second heat dissipating channel formed in the heat sink and between the fins and the base; a lamp cover connected with the heat sink and having a light output surface and an end surface; wherein the base of the heat sink has a lower end located under the base, the lower end protrudes from the light emitting surface in an axis of the LED lamp; another side of the base of the heat sink, which is opposite to the lower end, has a back side, an end of each of the fins of the heat sink extends to connect with the back side, when the LED lamp is being hung, in an inward radial direction, the back side is upwardly slanted; wherein the fins of the heat sink include first fins and second fins, each of the first fins is divided into two portions in a radial direction of the LED lamp, the two portions are divided with a gap portion, each of the second fins has a third portion and a fourth portion extending therefrom, the fourth portions are located radially outside the third portions, the third portion is connected to the fourth portion through a transition portion, the transition portion has a buffer section and a guide section, a direction of any tangent of the guide section is separate from the gap portion.

Claims

1. An LED (light emitting diode) lamp comprising:

a lamp shell including a lamp head, a lamp neck and a sleeve, the lamp head connects to the lamp neck which connects to the sleeve;

a passive heat dissipating element having a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base, the sleeve of the lamp shell is located in the heat sink, the lamp neck projects from the heat sink, height of the lamp neck is at least 80% of height of the heat sink;

a power source having a first portion and a second portion, wherein the first portion of the power source is disposed in both the lamp neck and the lamp head of the lamp shell, and the second portion of the power source is disposed in the heat sink of the passive heat dissipating element;

a light emitting surface connected to the heat sink of the passive heat dissipating element and comprising LED chips electrically connected to the power source, wherein the light emitting surface and the heat sink are connected to form a heat transferring path from the LED chips to the passive heat dissipating element;

a first heat dissipating channel formed in a first chamber of the lamp shell for dissipating heat generated from the power source while the LED lamp is working, and the first chamber is located between bottom of the LED lamp and an upper portion of the lamp neck;

a second heat dissipating channel formed in the heat sink and between the fins and the base of the heat sink for dissipating the heat generated from the LED chips and transferred to the heat sink;

a lamp cover connected with the heat sink and having a light output surface and an end surface, wherein the end surface is formed with a vent to allow air flowing from outside of the LED lamp into both the first heat dissipating channel and the second heat dissipating channel through the vent;

wherein the first heat dissipating channel comprises a first end on the light emitting surface to allow air flowing from outside of the LED lamp into the first chamber, and a second end on the upper portion of the lamp neck of the lamp shell to allow air flowing from inside of the first chamber out to the LED lamp;

wherein the second heat dissipating channel comprises a third end on the light emitting surface to allow air flowing from outside of the LED lamp into the second heat dissipating channel, and flowing out from spaces between every adjacent two of the fins;

wherein the base of the heat sink has a lower end located under the base, the lower end protrudes from the light emitting surface in an axis of the LED lamp;

another side of the base of the heat sink, which is opposite to the lower end, has a back side, an end of each of the fins of the heat sink extends to connect with the back side, when the LED lamp is being hung, in an inward radial direction, the back side is upwardly slanted;

wherein the fins of the heat sink include first fins and second fins, each of the first fins is divided into two portions in a radial direction of the LED lamp, the two portions are divided with a gap portion, each of the second fins has a third portion and a fourth portion extending therefrom, the fourth portions are located radially outside the third portions, the third portion is connected to the fourth portion through a transition portion, the transition portion has a buffer section and a guide section, a direction of any tangent of the guide section is separate from the gap portion.

2. The LED lamp of claim 1, wherein a receiving space is encompassed by the lower ends for receiving the lamp cover, height of the lamp cover received in the receiving space does not project from the lower end.

3. The LED lamp of claim 2, wherein the light emitting surface includes three LED chip sets, each of the three LED sets has LED chips, the light emitting surface is divided into three areas comprising an inner ring, a middle ring and an outer ring, the three LED chip sets are respectively located in the inner ring, the middle ring and the outer ring, when at least one fin of the heat sink is projected onto a plane on which the LED chip set is located along an axial direction of the LED lamp, a projection of the at least one fin at least touches at least one LED chip of the LED chip set in the inner ring, the middle ring or the outer ring.

4. The LED lamp of claim 3, wherein any of the fins is projected onto a plane on which the LED chip set is located along the axial direction of the LED lamp, a projection of any of the fins at least touches at least one LED chip of the LED chip set.

5. The LED lamp of claim 4, wherein the LED chip set in the outer ring corresponding to the fins are greater than the LED chip set in the inner ring in number, the LED chip set in the outer ring has more LED chips than the LED chip set in the inner ring in number.

6. The LED lamp of claim 5, wherein a third aperture is located in a central region of the light emitting surface, and the third aperture forms an air intake of both the first heat dissipating channel and the second heat dissipating channel.

7. The LED lamp of claim 6, wherein the light emitting surface has an inner border and an outer border, both the inner border and the outer border separately upward extend along the axial direction of the LED lamp to form a region, an area of part of the fins inside the region is greater than an area of part of the fins outside the region.

8. The LED lamp of claim 7, wherein the sleeve corresponds to the third aperture.

9. The LED lamp of claim 8, wherein each LED chip of one of the LED chip sets on the light emitting surface is radially interlacedly arranged with any one LED chip of adjacent one of the LED chip sets on the light emitting surface.

10. The LED lamp of claim 9, wherein the projecting area of the gap portion directly exactly corresponds to an area that the LED chips are positioned on the light emitting surface.

11. The LED lamp of claim 10, wherein the first air inlet is projected onto the end surface in an axis of the LED lamp to occupy an area on the end surface, which is defined as a first portion, another area on the end surface is defined as a second portion, and the vent in the first portion is greater than the vent in the second portion in area.

12. The LED lamp of claim 11, wherein an inner reflecting surface is disposed inside the light output surface of the lamp cover, an outer reflecting surface is disposed in the outer circle of the array of LED chips.

13. The LED lamp of claim 12, wherein a second chamber is formed between the light output surface, the inner reflecting surface, the outer reflecting surface and the light emitting surface, the LED chips of the light emitting surface are located in the second chamber.

14. The LED lamp of claim 13, wherein the second chamber has first apertures and second apertures, the first apertures are configured to communicate with the outside, and the second apertures are configured to communicate simultaneously with both the first heat dissipating channel and the second heat dissipating channel.

15. The LED lamp of claim 14, wherein the light output surface is provided with holes to form the first apertures, the first apertures are annularly located at a circumferential portion of the light output surface.

16. The LED lamp of claim 15, wherein the inner reflecting surface is provided with notches to form the second apertures, the second apertures are annularly located at a circumferential portion of the inner reflecting surface.

17. The LED lamp of claim 16, wherein the ratio of the number of the second apertures to that of the first apertures is about 1:

1˜

2.