ROTATABLE HEAT SINK WITH INTERNAL CONVECTION

• US 20170328549A1
• Filed: 05/12/2016
• Published: 11/16/2017
• Est. Priority Date: 05/12/2016
• Status: Active Grant

• Current Assignee: Christie Digital Systems USA Incorporated (Ushio Incorporated)
• Original Assignee: Christie Digital Systems USA Incorporated (Ushio Incorporated)
• Inventors: ADEMA, Daniel Robert, HILL, Graham
• Granted Patent: US 9,970,643 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 29/502 characterised by the adaptation for cooling of specific components
• CPC Class Codes: F21V 29/56 using liquid coolants F21V29/51 takes precedence
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F28D 11/02 the movement being rotary, e.g. performed by a drum or roller F28D11/08 takes precedence
• CPC Class Codes: F28D 15/0208 using moving tubes
• CPC Class Codes: F28D 2015/0291 comprising internal rotor means, e.g. turbine driven by the working fluid
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 13/125 by stirring
• CPC Class Codes: F28F 13/18 by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
• CPC Class Codes: F28F 2245/06 having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation
• CPC Class Codes: F28F 5/00 Elements specially adapted for movement
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197

Abstract

According to the present specification there is provided a rotatable heat sink device which comprises a heat sink configured to enclose a cooling fluid, and the heat sink is rotatable about a rotational axis. The heat sink, in turn, comprises a first portion configured to receive thermal energy from a source external to the heat sink, and a second portion configured to dissipate at least a portion of the thermal energy to surroundings external to the device. The device further comprises an optical wavelength conversion material disposed on an outside surface of the first portion of the heat sink, and an agitator disposed inside the heat sink. The agitator is rotationally independent of the heat sink and is configured to promote circulation of the cooling fluid between the first portion and the second portion.

Claims

1. A device comprising:

a heat sink configured to enclose a cooling fluid, the heat sink rotatable about a rotational axis, the heat sink comprising;

a first portion configured to receive thermal energy from a source external to the heat sink; and

a second portion configured to dissipate at least a portion of the thermal energy to surroundings external to the device;

an optical wavelength conversion material disposed on an outside surface of the first portion; and

an agitator disposed inside the heat sink, the agitator rotationally independent of the heat sink, the agitator configured to promote circulation of the cooling fluid between the first portion and the second portion.

2. The device of claim 1, wherein:

the first portion comprises a first end wall disposed radially to the rotational axis; and

the second portion comprises;

a second end wall disposed radially to the rotational axis; and

a side wall cooperating with the first end wall and the second end wall to define the heat sink.

3. The device of claim 2, wherein the side wall is disposed at an angle to the rotational axis, the angle greater than 0°

and less than 90°

.

4. The device of claim 2, wherein the second portion further comprises one or more fins extending from an outer surface of one or more of the side wall and the second end wall.

5. The device of claim 2, wherein an inner surface of one or more of the first portion and the second portion comprises one or more surface features configured to promote circulation of the cooling fluid between the first portion and the second portion.

6. The device of claim 5, wherein the one or more surface features comprise one or more of depressions and projections.

7. The device of claim 5, wherein the one or more surface features comprise one or more of grooves, baffles, fins, and blades.

8. The device of claim 2, wherein an inner surface of the side wall comprises a spiral screw surface profile configured to promote circulation of the cooling fluid between the first portion and the second portion.

9. The device of claim 1, further comprising the cooling fluid enclosed inside the heat sink.

10. The device of claim 9, wherein the cooling fluid comprises a liquid coolant.

11. The device of claim 9, wherein the cooling fluid comprises a liquid and gas mixture.

12. The device of claim 1, wherein the optical wavelength conversion material comprises one or more of a phosphor and quantum dots.

13. The device of claim 1, wherein the agitator comprises one or more surface features configured to promote circulation of the cooling fluid between the first portion and the second portion.

14. The device of claim 13, wherein the one or more surface features comprise one or more of depressions and projections.

15. The device of claim 1, wherein the agitator is configured to be magnetically coupled to an agitator driver disposable outside the heat sink.

16. The device of claim 1, wherein the agitator is configured to be rotated about the rotational axis at one or more of a speed and a direction different than a corresponding rotational speed and direction of the heat sink.

17. The device of claim 16, wherein the agitator is configured to be rotated intermittently about the rotational axis.

18. The device of claim 16, wherein the agitator is configured to be oscillated about the rotational axis.

19. The device of claim 1, wherein the agitator is configured to remain static when the heat sink is rotating about the rotational axis.

20. A device comprising:

a heat sink configured to enclose a cooling fluid, the heat sink rotatable about a rotational axis, the heat sink comprising;

a first portion comprising a first end wall disposed radially to the rotational axis, the first portion configured to receive thermal energy from a source external to the heat sink; and

a second portion configured to dissipate at least a portion of the thermal energy to surroundings external to the heat sink, the second portion comprising;

a second end wall disposed radially to the rotational axis; and

a side wall cooperating with the first end wall and the second end wall to define the heat sink; and

an agitator disposed inside the heat sink, the agitator rotationally independent of the heat sink, the agitator configured to promote circulation of the cooling fluid between the first portion and the second portion.