Thermal flux generating device with magnetocaloric material

• US 8,695,354 B2
• Filed: 04/24/2009
• Issued: 04/15/2014
• Est. Priority Date: 04/28/2008
• Status: Expired due to Fees

• Current Assignee: Cooltech Applications
• Original Assignee: Cooltech Applications
• Inventors: Heitzler, Jean-Claude, Muller, Christian
• Primary Examiner(s): Jules, Frantz F.
• Assistant Examiner(s): TRPISOVSKY, JOSEPH F
• Application Number:
  US12/989,815
• Publication Number:
  US 20110041514A1
• Time in Patent Office: 1,817 Days
• Field of Search: 62/31
• 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

The thermal flux generating device (10) with magnetocaloric material comprises an external cylindrical shell (11), made out of metal or any other adequate material, which delimits the inside of the device (10). Inside this shell (11), a rotor (12) is mounted coaxially which consists of a rotary magnetic arrangement, at least one roughly circular ring of elements (13) comprising at least one magnetocaloric material, this ring is positioned coaxially around the rotor (12) and a set of electric coils (14), with radial axes, evenly positioned around the rotor (12) and which make up a stator (15) electrically supplied so as to create a rotating field that rotationally drives the magnetic arrangement.

Claims

1. A thermal flux generating device with magnetocaloric material (10, 20, 100, 50, 60) comprising:

at least one thermal flux generating unit housed in an external shell (11, 21, 91, 201) and equipped with at least one thermal element containing at least one magnetocaloric element;

at least one magnetic arrangement arranged so as to generate a magnetic field;

at least one electric drive arranged so as to facilitate relative movement of the magnetic arrangement in relation to each of the at least one magnetocaloric element (13, 23, 56, 66, 99, 207) to subject each of the at least one magnetocaloric element to a variation in magnetic field and to cause a temperature of the magnetocaloric element to vary;

means for collecting at least one of calories and frigories emitted by each of the at least one magnetocaloric element due to the variation in the magnetic field;

the electric drive being integrated into the thermal flux generating device with magnetocaloric material (10, 20, 100, 50, 60, 90, 200) and comprising at least one electric coil (14, 24, 55, 65, 97, 205) equipped with a winding supported by an armature (16) and supplied with electric current so as to generate the variation in the magnetic field which causes the movement of a mobile assembly (12, 22, 52, 62, 96, 204) that supports the magnetic arrangement;

the at least one magnetocaloric element (13, 23, 56, 66, 99, 207) being located directly adjacent to the magnetic arrangement and positioned in an air gap formed by at least a first space (E1) delimited radially between the magnetic arrangement and the armature (16) of the electric coils.

2. The device according to claim 1, further comprising at least two electric coils (14, 24, 55, 65, 97, 205).

3. The device according to claim 1, wherein the magnetocaloric element is positioned, in a continuous manner, in the first space (E1) and a second space (E2) adjacent to the first space, and the second space (E2) is delimited between the magnetic arrangement and the external shell (91, 201).

4. The device according to claim 2, wherein the electric drive is a rotary motor which comprises a fixed stator (15, 25) housed in the external shell (11, 21) and a rotor (12, 22) mounted inside the external shell, coaxially in relation to the fixed stator, and the rotor supports the magnetic arrangement and the fixed stator comprises the electric coils (14, 24), and the magnetocaloric elements (13, 23) form a continuous crown that surrounds the rotor (12, 22) and substantially fully takes up the first space (E1) of the air gap formed between the fixed stator and the rotor.

5. The device according to claim 3, wherein the electric drive is a rotary motor which comprises a fixed stator (98) housed in the external shell (91) and a rotor (96) mounted inside the external shell, coaxially in relation to the fixed stator, and the rotor supports the magnetic arrangement and the fixed stator comprises at least two electric coils (97) that extend angularly over a first portion of the external shell while leaving a second portion of the external shell free from the electric coils (97), and the magnetocaloric element (99) is positioned both in the first space (E1) that corresponds to the first portion of the shell and in the second space (E2), adjacent to the first space, which corresponds to the second portion of the external shell free from the electric coils (97).

6. The device according to claim 2, wherein the electric drive is a linear motor which comprises an elongated shell, a fixed linear stator (51, 61) housed in the elongated shell and a mobile carriage (52, 62) that moves linearly, alternately in relation to the fixed stator, the mobile carriage supporting the magnetic arrangement and the fixed stator comprising the electric coils (55, 65), and the magnetocaloric elements (56, 66) form at least one continuous row lined up along the fixed linear stator (51, 61) and substantially fully taking up the first space (E1) of the air gap between the linear stator and the mobile carriage.

7. The device according to claim 3, wherein the electric drive is a linear motor which comprises an elongated shell (201), a fixed linear stator (206) housed in the shell comprises the at least one electric coil (205) which extends over a first portion of a length of the shell while leaving a second portion of the length of the shell free from the electric coils, a carriage (204) that moves linearly, alternately in relation to the fixed stator and supporting the magnetic arrangement, and the magnetocaloric element is positioned both in the first space (E1) of the air gap that corresponds to the first portion of the length of the shell and in the second space (E2), adjacent to the first space, and which corresponds to the second portion of the shell free from electric coils.

8. The device according to claim 1, wherein the magnetic arrangement comprises a set of permanent magnets (17, 53).

9. The device according to claim 8, wherein the permanent magnets (17, 53) of the magnetic arrangement of the rotor comprise at least one magnetically permeable element (18, 54).

10. The device according to claim 4, wherein the electric coils (14, 24, 97) each have an axis which substantially extends a radial direction of the device.

11. The device according to claim 6, wherein each of the electric coils (55, 65, 205) has an axis that is parallel and substantially perpendicular to the moving direction of the mobile carriage (52, 62, 204).

12. The device according to claim 4, wherein the electric coils (14, 24) show a geometrical dissymmetry in relation to flux lines generated by the magnetic arrangement to impose either a preferred direction of rotation to the rotor (12, 22) or a preferred direction of linear movement to a mobile carriage (52, 62).

13. A thermal flux generating device comprising a magnetocaloric material, the thermal flux generating device comprising:

at least one thermal flux generating unit housed within an external shell and equipped with at least one thermal element containing at least one magnetocaloric element;

at least one magnetic arrangement arranged centrally within the housing for generating a magnetic field;

at least one electric drive arranged so as to facilitate movement of the magnetic arrangement relative to the at least one magnetocaloric element so as to subject the at least one magnetocaloric element to a variation in magnetic field and vary a temperature of the magnetocaloric element;

a mechanism for collecting at least one of calories and frigories emitted by the at least one magnetocaloric element due to the variation in the magnetic field;

the electric drive being integrated into the thermal flux generating device with the magnetocaloric material and comprising at least one electric coil equipped with a winding supported by an armature and supplied with electric current so as to generate the variation in the magnetic field which causes the movement of a mobile assembly that supports the magnetic arrangement;

the at least one magnetocaloric element being located in an air gap formed between the magnetic arrangement and the armature of the electric coils such that the at least one magnetocaloric element being directly adjacent to the magnetic arrangement so as to be subjected to a maximum magnetic flux.

14. A thermal flux generating device comprising a magnetocaloric material, the thermal flux generating device comprising:

at least one thermal flux generating unit housed within a stator of an external shell and equipped with at least one thermal element containing at least one magnetocaloric element;

at least one magnetic arrangement arranged within the housing and supported by a rotor of the thermal flux generating device for generating a magnetic field;

at least one electric drive arranged so as to facilitate movement of the magnetic arrangement relative to the at least one magnetocaloric element so as to subject the at least one magnetocaloric element to a variation in magnetic field and vary a temperature of the magnetocaloric element;

a mechanism for collecting at least one of calories and frigories emitted by the at least one magnetocaloric element due to the variation in the magnetic field;

the electric drive being integrated into the thermal flux generating device with the magnetocaloric material and comprising at least one electric coil equipped with a winding supported by an armature and supplied with electric current so as to generate the variation in the magnetic field which causes the movement of the rotor which supports the magnetic arrangement;

the at least one magnetocaloric element being located on a radially inner most section of the stator, in an air gap formed between the stator and the rotor supporting the magnetic arrangement such that the at least one magnetocaloric element being directly adjacent to the magnetic arrangement so as to be subjected to a maximum magnetic flux.