Cooling System and LED- Based Light Comprising Same

• US 20140268827A1
• Filed: 06/08/2012
• Published: 09/18/2014
• Est. Priority Date: 06/08/2011
• Status: Active Grant

• Current Assignee: Cooper Crouse-Hinds GmbH, (Eaton Corporation PLC.)
• Original Assignee: Cooper Crouse-Hinds GmbH, (Eaton Corporation PLC.)
• Inventors: Schwarz, Gerhard, Burmeister, Jens
• Granted Patent: US 9,410,686 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 25/12 Flameproof or explosion-proof arrangements
• CPC Class Codes: F21V 29/65 the gas flowing in a closed circuit
• CPC Class Codes: F21V 29/673 the fans being used for intake
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A cooling system (1) of a light-emitting diode-based light (2) is proposed, wherein said light comprises a completely closed light fitting (3) with a flame-proof housing (4). In the housing, a cooling body (5) as part of the cooling system (1) is arranged. The cooling system (1) further comprises an electrically operated air circulation means (6).

By such a cooling system, it is possible to compensate reduction in light flux with minimal additional costs or minimal additional weight or size of the light, wherein the LED light is simultaneously usable in hazardous areas in a wide temperature range.

Claims

1. An LED-based light (2) with at least a cooling system (1) and a number of LEDS, said light (2) comprising a completely closed light fitting (3) with a flame proof housing (4), in which a cooling body (5) as a part of the cooling system (1) is arranged, wherein the cooling system (1) further comprises an electrically operated air circulation means (6), which comprises at least a cooling fan (7, 15, 16;

25).

2. The LED-based light according to claim 1, wherein the air circulation means (6) is arranged within the flameproof housing (4).

3. The LED-based light according to claim 1, wherein the flameproof housing (4) is an ex-d enclosure.

4. The LED-based light according to claim 1, wherein the LED-based light (2) comprises at least a LED-module (8) with a LED-board (9) including a printed circuit board (PCB) (10) and multiple LEDs (11).

5. The LED-based light according to claim 4, wherein the LED-board (9) is in contact with the cooling body (5) comprising a number of cooling ribs (12, 19).

6. The LED-based light according to claim 4, wherein the air circulation means (6) is arranged in an opening (13) of the LED-board (9) and/or cooling body (5).

7. The LED-based light according to claim 4, wherein an air circulation chamber (14) is formed around the LED-module (8) and the cooling body (5) within the housing.

8. The LED-based light according to claim 1, wherein the cooling fan (7) of the air circulation means (6) is separated from a fan motor (15) with a mechanical torque transmission means (16) therebetween.

9. The LED-based light according to claim 8, wherein the fan motor (15) is arranged within the flameproof housing (4) and the cooling fan (25) is assigned to an outer housing (17) as an outer fan, which outer housing (17) at least partially covers the flameproof housing (4) with an air guiding means (18) therebetween.

10. The LED-based light according to claim 9, wherein a number of cooling ribs (19) extend between an outer surface (24) of the flameproof housing (4) and the outer housing (17) and are provided within the air guiding means (18).

11. The LED-based light according to claim 9, wherein the air guiding means (18) is formed by an air guiding channel (20) which is open at both channel ends (21, 22) for guiding air therethrough.

12. The LED-based light according to claim 9, wherein the outer fan is arranged near or at one channel end (21, 22).

13. The LED-based light according to claim 8, wherein the mechanical torque transmission means (16) extends through the air guiding channel (20) from the fan motor (15) within the flameproof housing (4) to the outer fan within the air guide channel (20).

14. The LED-based light according to claim 1, wherein an inner fan (7) is arranged within the flameproof housing (4).

15. The LED-based light according to claim 1, wherein an inner fan (7) is also actuated by a fan motor (15) of the cooling fan (25).

16. The LED-based light according to claim 9, wherein the outer fan (25) is supported by cooling ribs (19).

17. The LED-based light according to claim 8, wherein the fan motor (15) is in contact with cooling ribs (12).

18. The LED-based light according to claim 1, wherein at least one temperature sensor (23) is arranged within the flameproof housing (4) to control actuation and/or speed of the cooling fan (7, 25).