Magneto-caloric thermal diode assembly

• US 10,551,095 B2
• Filed: 04/18/2018
• Issued: 02/04/2020
• Est. Priority Date: 04/18/2018
• Status: Active Grant

• Current Assignee: Haier US Appliance Solutions, Inc. DBA GE Appliances (Haier Group Company)
• Original Assignee: Haier US Appliance Solutions, Inc. DBA GE Appliances (Haier Group Company)
• Inventors: Schroeder, Michael Goodman
• Primary Examiner(s): Jules, Frantz F
• Assistant Examiner(s): Mendoza-Wilkenfel, Erik
• Application Number:
  US15/955,758
• Publication Number:
  US 20190323738A1
• Time in Patent Office: 657 Days
• CPC Class Codes: F25B 21/00 Machines, plants or systems, using electric or magnetic effects
• CPC Class Codes: F25B 2321/0021 with a static fixed magnet
• CPC Class Codes: F25B 2321/0022 with a rotating or otherwise moving magnet
• CPC Class Codes: F25D 11/02 with cooling compartments at different temperatures
• CPC Class Codes: F25D 19/006 Thermal coupling structure or interface
• CPC Class Codes: H01F 1/012 adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material refrigeration systems using magnetic effects F25B21/00
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A magneto-caloric thermal diode assembly includes a plurality of elongated magneto-caloric members. Each of a plurality of thermal stages includes a plurality of magnets and a plurality of non-magnetic blocks distributed in a sequence of magnet then non-magnetic block along a transverse direction. The plurality of thermal stages and the plurality of elongated magneto-caloric members are configured for relative motion along the transverse direction. The plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction within each of the plurality of thermal stages. Each of the plurality of magnets in the plurality of thermal stages is spaced from a respective non-magnetic block in an adjacent thermal stage towards a cold side thermal stage along the lateral direction and is in conductive thermal contact with a respective non-magnetic block in an adjacent thermal stage towards a hot side thermal stage along the lateral direction.

Claims

1. A magneto-caloric thermal diode assembly, comprising:

a plurality of elongated magneto-caloric members; and

a plurality of thermal stages stacked along a lateral direction between a cold side and a hot side, a cold side thermal stage of the plurality of thermal stages positioned at the cold side, a hot side thermal stage of the plurality of thermal stages positioned at the hot side, each of the plurality of thermal stages comprising a plurality of magnets and a plurality of non-magnetic blocks distributed in a sequence of magnet then non-magnetic block along a transverse direction that is perpendicular to the lateral direction,

wherein

the plurality of thermal stages and the plurality of elongated magneto-caloric members are configured for relative motion between the plurality of thermal stages and the plurality of elongated magneto-caloric members along the transverse direction,

the plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction within each of the plurality of thermal stages,

each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is spaced from a respective non-magnetic block in an adjacent thermal stage towards the cold side thermal stage along the lateral direction, and

each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is in conductive thermal contact with a respective non-magnetic block in an adjacent thermal stage towards the hot side thermal stage along the lateral direction.

2. The magneto-caloric thermal diode assembly of claim 1, wherein the plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction by insulation within each of the plurality of thermal stages.

3. The magneto-caloric thermal diode assembly of claim 1, wherein each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is spaced from the respective non-magnetic block in an adjacent thermal stage towards the cold side thermal stage along the lateral direction by insulation.

4. The magneto-caloric thermal diode assembly of claim 1, further comprising a heat exchanger positioned at the cold side.

5. The magneto-caloric thermal diode assembly of claim 1, wherein each of the plurality of non-magnetic blocks in the plurality of thermal stages is an aluminum block.

6. The magneto-caloric thermal diode assembly of claim 1, wherein each of the plurality of magnets in the plurality of thermal stages comprises a magnet pair, each of the plurality of elongated magneto-caloric members positioned between the magnet pairs along the lateral direction in a respective thermal stage of the plurality of thermal stages.

7. The magneto-caloric thermal diode assembly of claim 1, wherein the plurality of magnets and the plurality of non-magnetic blocks of each of the plurality of thermal stages collectively define a slot, each elongated magneto-caloric member of the plurality of elongated magneto-caloric members received within a respective slot of the plurality of thermal stages.

8. The magneto-caloric thermal diode assembly of claim 7, wherein each slot has a width along the lateral direction, each elongated magneto-caloric member of the plurality of elongated magneto-caloric members having a thickness along the lateral direction, the thickness of each elongated magneto-caloric member being about one hundredth of an inch greater than the width of the respective slot.

9. The magneto-caloric thermal diode assembly of claim 1, wherein plurality of thermal stages comprises no less than eight thermal stages.

10. The magneto-caloric thermal diode assembly of claim 1, wherein each of the plurality of elongated magneto-caloric members has a different Curie temperature.

11. A magneto-caloric thermal diode assembly, comprising:

a plurality of elongated magneto-caloric members; and

a plurality of thermal stages stacked along a lateral direction between a cold side and a hot side, a cold side thermal stage of the plurality of thermal stages positioned at the cold side, a hot side thermal stage of the plurality of thermal stages positioned at the hot side, each of the plurality of thermal stages comprising a plurality of magnets and a plurality of non-magnetic blocks distributed in a sequence of magnet then non-magnetic block along a transverse direction that is perpendicular to the lateral direction,

wherein

each elongated magneto-caloric member of the plurality of elongated magneto-caloric members is received within a respective one of the plurality of thermal stages such that the plurality of thermal stages and the plurality of elongated magneto-caloric members are configured for relative motion between the plurality of thermal stages and the plurality of elongated magneto-caloric members along the transverse direction,

the plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction within each of the plurality of thermal stages,

each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is spaced from a respective non-magnetic block in an adjacent thermal stage towards the cold side thermal stage along the lateral direction, and

each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is in conductive thermal contact with a respective non-magnetic block in an adjacent thermal stage towards the hot side thermal stage along the lateral direction.

12. The magneto-caloric thermal diode assembly of claim 11, wherein the plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction by insulation within each of the plurality of thermal stages.

13. The magneto-caloric thermal diode assembly of claim 11, wherein each of the plurality of magnets in the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is spaced from the respective non-magnetic block in an adjacent thermal stage towards the cold side thermal stage along the lateral direction by insulation.

14. The magneto-caloric thermal diode assembly of claim 11, further comprising a heat exchanger positioned at the cold side.

15. The magneto-caloric thermal diode assembly of claim 11, wherein each of the plurality of non-magnetic blocks in the plurality of thermal stages is an aluminum block.

16. The magneto-caloric thermal diode assembly of claim 11, wherein each of the plurality of magnets in the plurality of thermal stages comprises a magnet pair, each of the plurality of elongated magneto-caloric members positioned between the magnet pairs along the lateral direction in a respective thermal stage of the plurality of thermal stages.

17. The magneto-caloric thermal diode assembly of claim 11, wherein the plurality of magnets and the plurality of non-magnetic blocks of each of the plurality of thermal stages collectively define a slot, each elongated magneto-caloric member of the plurality of elongated magneto-caloric members received within a respective slot of the plurality of thermal stages.

18. The magneto-caloric thermal diode assembly of claim 17, wherein each slot has a width along the lateral direction, each elongated magneto-caloric member of the plurality of elongated magneto-caloric members having a thickness along the lateral direction, the thickness of each elongated magneto-caloric member being about one hundredth of an inch greater than the width of the respective slot.

19. The magneto-caloric thermal diode assembly of claim 11, wherein plurality of thermal stages comprises no less than eight thermal stages.

20. The magneto-caloric thermal diode assembly of claim 11, wherein each of the plurality of elongated magneto-caloric members has a different Curie temperature.