MAGNETIC REFRIGERATOR

• US 20140075958A1
• Filed: 04/23/2012
• Published: 03/20/2014
• Est. Priority Date: 05/02/2011
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Takahashi, Hidekazu, Tasaki, Yutaka
• Granted Patent: US 9,273,886 B2
• Time in Patent Office: Days
• US Class Current: 62/3.1
• CPC Class Codes: F25B 21/00 Machines, plants or systems, using electric or magnetic effects
• CPC Class Codes: F25B 2321/0022 with a rotating or otherwise moving magnet
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A magnetic body is provided to improve heat transport capability and heat transport efficiency. A magnetic body arranged plate has magnetic body units each including magnetic members. Low-temperature side and high-temperature side heat exchange units are disposed at ends of each magnetic body unit. Permanent magnets and heat conductive members are arranged on a magnet/heat conductive member arranged plate. When the magnetic body arranged plate and the magnet/heat conductive member arranged plate are moved relative to each other, the permanent magnets apply magnetism separately to the magnetic members of each magnetic body unit. The magnet/heat conductive member arranged plate creates a temperature difference and conducts heat in one direction between the magnetic members, the low-temperature side heat exchange unit, and the high-temperature side heat exchange unit.

Claims

1. A magnetic refrigerator comprising:

a magnetic body arranged plate on which a plurality of magnetic body units are disposed, each magnetic body unit having magnetic members of a same material arranged side by side, the plurality of magnetic body units disposed side by side in a direction perpendicular to an arrangement direction of the magnetic members;

a low-temperature side heat exchange unit adjacent to and spaced with a gap from a first end magnetic member positioned on one end of each magnetic body unit;

a high-temperature side heat exchange unit adjacent to and spaced with a gap from a second end magnetic member positioned on another end of each magnetic body unit;

a magnet/heat conductive member arranged plate on which magnetism applying units and heat conductive members are provided, the magnetism applying unit configured to apply magnetism separately to the magnetic members of each magnetic body unit disposed on the magnetic body arranged plate and the heat conductive members configured to conduct heat generated in each magnetic body unit from the low-temperature side heat exchange unit to the high-temperature side heat exchange unit; and

a driving unit that drives at least one of the magnetic body arranged plate and the magnet/heat conductive member arranged plate to move relative to each other the magnetic body arranged plate and the magnet/heat conductive member arranged plate in the arrangement direction of the plurality of the magnetic body units.

2. The magnetic refrigerator as claimed in claim 1, wherein each magnetic member is formed by either a positive magnetic material that generates heat upon magnetism being applied and absorbs heat upon heat removal, or a negative magnetic material that absorbs heat upon magnetism being applied and generates heat upon heat removal.

3. The magnetic refrigerator as claimed in claim 1, wherein

the magnetism applying units are configured to selectively approach or depart the magnetic members arranged on the magnetic body arranged plate to exhibit magnetocaloric effect in response to the relative movement between the magnet/heat conductive member arranged plate and the magnetic body arranged plate, and wherein

the heat conductive members are configured to selectively insert or remove between the magnetic members arranged on the magnetic body arranged plate, between the low-temperature side heat exchange unit and the first end magnetic member, and between the high-temperature side heat exchange unit and the second end magnetic member in response to the relative movement between the magnet/heat conductive member arranged plate and the magnetic body arranged plate, to conduct the heat generated through magnetocaloric effect.

4. The magnetic refrigerator as claimed in claim 1, wherein

the magnet/heat conductive member arranged plate is formed by two flat plates magnetically connected to each other and sandwiching the magnetic body arranged plate with a gap, and

the magnetism applying units each have a magnetic circuit formed by the two flat plates, a permanent magnet mounted on one of the two flat plates, and a magnetic projection formed on the other of the two flat plates.

5. The magnetic refrigerator as claimed in claim 4, wherein

the magnetic body arranged plate and the magnet/heat conductive member arranged plate are formed of a hollow disc with a center portion that is open;

one of the low-temperature side heat exchange unit and the high-temperature side heat exchange unit is arranged in the center portion of the magnetic body arranged plate and the magnet/heat conductive member arranged plate and the other is disposed at an outer periphery of the magnetic body arranged plate and the magnet/heat conductive member arranged plate; and

the driving unit is configured to rotate the magnet/heat conductive member arranged plate about the center portion as a rotation axis.

6. The magnetic refrigerator as claimed in claim 1, wherein

the magnetic body arranged plate and the magnet/heat conductive member arranged plate are formed of a hollow disc with a center portion that is open;

one of the low-temperature side heat exchange unit and the high-temperature side heat exchange unit is arranged in the center portion of the magnetic body arranged plate and the magnet/heat conductive member arranged plate and the other is disposed at an outer periphery of the magnetic body arranged plate and the magnet/heat conductive member arranged plate; and

the driving unit is configured to rotate the magnetic body arranged plate about the center portion as a rotation axis.

7. The magnetic refrigerator as claimed in claim 5, wherein

the magnetic members arranged on the magnetic body arranged plate are configured such that a volume of each of the magnetic members is equal to or successively smaller from an inner periphery to the outer periphery of the magnetic body arranged plate.

8. The magnetic refrigerator as claimed in claim 7, wherein

a radial thickness of each of the magnetic members arranged on the magnetic body arranged plate is successively thinner from the inner periphery to the outer periphery of the magnetic body arranged plate.

9. The magnetic refrigerator as claimed in claim 8, wherein the radial thickness of each of the heat conductive members arranged on the magnet/heat conductive member arranged plate is successively thicker and a circumferential length is successively longer.

10. The magnetic refrigerator as claimed in claim 7, wherein

each permanent magnet disposed on the magnet/heat conductive member arranged plate is configured such that a radial thickness is successively thinner while a circumferential length is successively longer in a direction from the inner periphery toward the outer periphery of the magnet/heat conductive member arranged plate.