JP4567609B2 - Magnetic working substance rotating type magnetic refrigerator - Google Patents

Description

  The present invention relates to a magnetic working material rotating magnetic refrigerator.

  Conventionally, a permanent magnet reciprocating drive type magnetic refrigerator has been used as a refrigerator in magnetic cooling technology, but recently, instead of the reciprocating drive system, a permanent magnet that causes a magnetic field change by rotating the permanent magnet. A rotary drive type magnetic refrigerator has been used (Non-Patent Document 1 below).

  FIG. 5 is a diagram illustrating the principle of such a magnetic refrigeration system.

  The magnetic refrigeration system uses a phenomenon (magnetocaloric effect) that generates heat when a magnetic field is applied to a magnetic material (hereinafter, the magnetic material used in magnetic refrigeration is referred to as a magnetic working substance) and decreases when the magnetic field is removed. is doing.

  The magnetic working material cools down when the direction of magnetization in the magnetic working material is aligned by an external magnetic field, and when the magnetic field is weakened (set to zero), the magnetization direction falls apart and the magnetic entropy increases. Because. At this time, the magnetic refrigeration is performed by the magnetic working material taking heat from the surroundings.

  FIG. 6 is a configuration diagram of such a conventional permanent magnet rotary drive type magnetic refrigerator.

In this figure, a container filled with four sets of magnetic working materials 102 to 105 is arranged around a rotating permanent magnet 101, and a structure in which a magnetic field change is repeatedly applied to the four sets of magnetic working materials 102 to 105 is configured. .
Building equipment and plumbing 2003, September, pp. 42-46

  However, the conventional permanent magnet rotation drive type magnetic refrigerator described above is provided with a permanent magnet 101, and a mechanism for rotating the permanent magnet 101, and magnetic working substances 102 to 105 fixed around the rotating permanent magnet 101 are arranged. For this reason, the size is increased, the response of the permanent magnet 101 to the magnetic working materials 102 to 105 is difficult, and a sharp magnetic field change cannot be performed.

  Further, the conventional system is equipped with a switching valve for switching the flow path, and it is necessary to control the switching of the flow path.

  In view of the above situation, the present invention rotates a magnetic working material mounted on a concentric circle of the central axis of the rotating part and spaced from the central axis around the central axis of the rotating part so as to face the fixed An object of the present invention is to provide a magnetic working material rotating type magnetic refrigerator that can perform refrigeration in relation to the superconducting bulk body.

In order to achieve the above object, the present invention provides
[1] In a magnetic working material rotating type magnetic refrigerator, a rotation magazine type hole is provided on a concentric circle of the central axis and spaced from the central axis, and the magnetic working material is mounted in this hole. The magazine-type rotating part is arranged in the central axis direction so as to face the rotating magazine-type rotating part adjacent to the rotating magazine-type rotating part, and can face the hole provided in the rotating magazine-type rotating part. A fixed part provided with a small hole, and the magnet of the rotary magazine type rotary part arranged in a fixed state in the central axis direction adjacent to the outside of the fixed part and through the hole formed in the fixed part And a magnetic field generating mechanism arranged to be able to face the magnetic working substance so as to act on the working substance.

  [2] In the magnetic working material rotating magnetic refrigerator as described in [1] above, the magnetic field generation mechanism is composed of a high-temperature superconducting bulk body.

  [3] In the magnetic working material rotating magnetic refrigerator as described in [1] above, the magnetic field generating mechanism is composed of a permanent magnet and an iron yoke.

  [4] The magnetic working material rotating magnetic refrigerator as described in [1] above, wherein the magnetic field generating mechanism is constituted by a normal conducting or superconducting coil.

  [5] In the magnetic working material rotating magnetic refrigerator as described in [2] above, the high-temperature superconducting bulk body is disposed on both sides of the rotating magazine rotating unit.

  [6] In the magnetic working material rotating magnetic refrigerator of the above [1] or [5], the rotating magazine type rotating unit is provided with four magnetic working materials mounted at equal intervals. To do.

  [7] In the magnetic working material rotating type magnetic refrigerator of the above [6], the rotating magazine type rotating unit includes four cylindrical holes at equal intervals so as to be opposed to the four magnetic working materials. And the magnetism of the high-temperature superconducting bulk body acts on two holes that are not adjacent to each other among the four cylindrical holes.

  [8] In the magnetic working material rotating type magnetic refrigerator of the above [7], the magnetic working material mounted on the rotating magazine type rotating unit is arranged and excited at a position facing the high temperature superconducting bulk body. When the magnetic working material attached to the rotating magazine type rotating part is disposed at a position not facing the high-temperature superconducting bulk body and demagnetized, the heat generated by the heat is exhausted by the exhaust heat part by the refrigerant. The magnetic working material absorbs heat from the refrigerant, and the absorbed heat is sent to a cooling stage.

  [9] In the magnetic working material rotating magnetic refrigerator of the above [8], a refrigerant flow path of a refrigerant for exchanging heat with the magnetic working material mounted on the rotating magazine type rotating part is the rotating magazine type. By rotating together with the rotating part, the direction of the refrigerant flow can be switched.

  According to the present invention, the following effects can be achieved.

  (1) The structure is simple and powerful freezing can be performed.

  (2) A unique magnetic field shape and a steep magnetic field gradient can be obtained, a sharp magnetic field change is possible, and good freezing can be performed.

  The magnetic working material rotating type magnetic refrigerator of the present invention is a concentric circle of the central axis, and a rotary magazine type hole is provided at a position spaced from the central axis, and the magnetic working material is installed in this hole. The magazine-type rotating part is arranged in the central axis direction so as to face the rotating magazine-type rotating part adjacent to the rotating magazine-type rotating part, and can face the hole provided in the rotating magazine-type rotating part. A fixed part provided with a small hole, and the magnet of the rotary magazine type rotary part arranged in a fixed state in the central axis direction adjacent to the outside of the fixed part and through the hole formed in the fixed part A high-temperature superconducting bulk body arranged to be opposed to the magnetic working material so as to act on the working material.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of the entire magnetic working substance rotating type (rotating magazine type) magnetic refrigerator of the present invention, and FIG. 2 is a diagram showing the configuration of the rotating flow path.

  In these drawings, the rotary magazine type rotating part 1 has a cylindrical shape and is formed so as to be able to rotate around a central axis 2. Four cylindrical holes 3 are formed at equal intervals on the concentric circle of the central shaft 2 that is separated from the central shaft 2. A magnetic working material 4 [for example, gadolinium (Gd)] is mounted in the four cylindrical holes 3. Therefore, the magnetic working material 4 also rotates around the central axis 2 when the rotary magazine type rotating unit 1 rotates. On both sides of the rotary magazine type rotary unit 1, fixed parts 5 and 6 are arranged adjacent to the rotary magazine type rotary unit 1. In the figure, for the sake of explanation, an interval is provided between the rotary magazine type rotary part 1 and the fixed parts 5 and 6, but these are actually in contact with no gap, and as will be described later, except for the flow path It is sealed. In addition, high-temperature superconducting bulk bodies 9 and 10 as magnetic field generating mechanisms are arranged in the axial direction on both outer sides of the fixed portions 5 and 6. The fixed parts 5 and 6 have four cylindrical holes 7 and 8 that can correspond to the four magnetic working substances 4 mounted on the rotary magazine type rotary part 1, as in the rotary magazine type rotary part 1. It is formed in the axial direction. Of these holes 7 and 8, they are arranged so that the magnetic field of high-temperature superconducting bulk bodies 9 and 10 acts only on two holes that are not adjacent to each other.

  Therefore, when the high-temperature superconducting bulk bodies 9 and 10 and the magnetic working material 4 are arranged to face each other through the cylindrical holes 7 and 8 of the fixing portions 5 and 6, the magnetic working material 4 is excited. When the high temperature superconducting bulk bodies 9 and 10 and the magnetic working material 4 are arranged so as not to face each other through the cylindrical holes 7 and 8, the magnetic working material 4 is demagnetized and absorbs heat. That is, the position of the magnetic working material 4 with respect to the fixed high-temperature superconducting bulk bodies 9 and 10 is changed by the rotation of the rotary magazine type rotating unit 1, so that this heat generation and endothermic cycle is repeated and refrigeration is performed. The refrigerant absorbed by the magnetic working substance 4 is sent to the cooling stage 12 via the refrigerant flow path 11. Further, the refrigerant that has absorbed the heat generated by the magnetic working substance 4 is sent to the heat exhausting section 14 via the refrigerant flow path 13 and is exhausted. The refrigerant exhausted here is transported again from the refrigerant flow path 11 to the magnetic working material 4 by the pump 15, and is repeatedly absorbed and sent to the cooling stage 12.

  With this configuration, the rotational motion can be performed on the magnetic working material side, and the high-temperature superconducting bulk body can be used while being fixed so as to face the magnetic working material.

  Moreover, powerful refrigeration can be performed with a simple structure.

  Furthermore, a unique magnetic field shape and a steep magnetic field gradient can be obtained, and a sharp magnetic field change is possible, so that good freezing can be performed.

  FIG. 3 is a diagram showing a case where the refrigerant flow path of the magnetic working material rotating type (rotating magazine type) magnetic refrigerator of the present invention is communicated, and FIG. 4 is a magnetic working material rotating type (rotating magazine type) magnetic refrigeration of the present invention. It is a figure which shows the case where the refrigerant | coolant flow path adjustment of a machine is not connected.

  The rotating magazine type rotating unit 1 is a rotating magazine type rotating unit on which a magnetic working material 4 is rotatably mounted, and a magnetic working material is provided on both sides thereof through cylindrical holes formed in a fixed unit. 4, high-temperature superconducting bulk bodies 9 and 10 fixed so as to be opposed to 4 are arranged.

  The joint between the rotary magazine type rotary part 1 and the fixed part is sealed except for the flow path. Further, the periphery of the magnetic working material 4 is insulated.

  Therefore, when the rotary magazine type rotating unit 1 rotates and the magnetic working material 4 and the high-temperature superconducting bulk body 9 are opposed to each other through the cylindrical holes 7 and 8, the refrigerant flow path is formed as shown in FIG. Opening and heat exchange are performed. When the magnetic working material 4 and the high-temperature superconducting bulk bodies 9 and 10 are not opposed to each other during the rotation of the rotating magazine type rotating unit 1, as shown in FIG. Since the joint between the rotating part 1 and the fixed parts 5 and 6 is sealed, the refrigerant does not flow.

  Since it comprised in this way, according to this invention, heat exchange can be performed efficiently and freezing can be performed effectively.

  In addition, the conventional system is equipped with a switching valve for switching the flow path, and it is necessary to control the switching of the flow path. However, according to the present invention, the role is achieved by the rotation of the rotating magazine type rotating unit. Since this can be achieved, a switching valve is not necessary.

  In the above embodiment, the high-temperature superconducting bulk body as the magnetic field generating mechanism has been described. However, in addition to the high-temperature superconducting bulk body, a permanent magnet and an iron yoke, a normal conducting or a superconducting coil may be used.

  Further, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

  The magnetic working substance rotating magnetic refrigerator of the present invention can provide a magnetic refrigerator that is compact and capable of efficient refrigeration, and is suitable for development of a material having a high magnetocaloric effect and miniaturization of an apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an entire magnetic working substance rotating type (rotating magazine type) magnetic refrigerator of the present invention. It is a figure which shows the structure of the rotation type flow path of the magnetic working material rotation type (rotary magazine type) magnetic refrigerator of this invention. It is a figure which shows the case where the refrigerant | coolant flow path of the magnetic working material rotation type (rotary magazine type) magnetic refrigerator of this invention is connecting. It is a figure which shows the case where the flow path of the magnetic working material rotation type (rotary magazine type) magnetic refrigerator of this invention is not connecting. It is principle explanatory drawing of a magnetic refrigerator system. It is a block diagram of the conventional permanent magnet rotation drive type magnetic refrigerator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating magazine type rotating part 2 Center axis 3,7,8 Cylindrical hole 4 Magnetic working substance 5,6 Fixed part 9,10 High temperature superconducting bulk body 11,13 Refrigerant flow path 12 Cooling stage 14 Heat exhaust part 15 Pump

Claims (9)

(A) a rotary magazine type rotary unit in which a hole is provided in a rotary magazine type on a concentric circle of the central axis and spaced from the central axis, and a magnetic working material is mounted in the hole;
(B) A hole that is disposed adjacent to the rotary magazine type rotary unit in the direction of the central axis so as to face the rotary magazine type rotary unit and that can face the hole provided in the rotary magazine type rotary unit. A fixed portion provided;
(C) Adjacent to the outer side of the fixed part and arranged in a fixed state in the central axis direction so as to act on the magnetic working substance of the rotary magazine type rotary part through the hole formed in the fixed part. And a magnetic field generating mechanism arranged to be opposed to the magnetic working material.   2. The magnetic working material rotating type magnetic refrigerator according to claim 1, wherein the magnetic field generating mechanism is composed of a high-temperature superconducting bulk body.   2. The magnetic working material rotating type magnetic refrigerator according to claim 1, wherein the magnetic field generating mechanism comprises a permanent magnet and an iron yoke.   2. The magnetic working material rotating type magnetic refrigerator according to claim 1, wherein the magnetic field generating mechanism is constituted by a normal conducting or superconducting coil.   3. The magnetic working material rotating magnetic refrigerator according to claim 2, wherein the high temperature superconducting bulk body is disposed on both sides of the rotating magazine rotating unit.   6. The magnetic working material rotating type magnetic refrigerator according to claim 1 or 5, wherein four magnetic working materials are mounted at equal intervals on the rotating magazine type rotating unit. Magnetic refrigerator.   In the magnetic working material rotating type magnetic refrigerator of claim 6, four cylindrical holes are formed at equal intervals in the rotating magazine type rotating part so as to be able to face the four magnetic working materials, A magnetic working material rotating magnetic refrigerator, wherein the magnetism of the high-temperature superconducting bulk body acts on two holes that are not adjacent to each other among the four cylindrical holes.   8. The magnetic working material rotating type magnetic refrigerator according to claim 7, wherein the magnetic working material mounted on the rotating magazine type rotating unit is arranged and excited at a position facing the high temperature superconducting bulk body. When the magnetic working material is disposed in a position not facing the high-temperature superconducting bulk body and is demagnetized when the heat is exhausted by the refrigerant at the heat exhausting portion, and the magnetic working material attached to the rotating magazine type rotating unit is demagnetized. The magnetic working material rotating type magnetic refrigerator is configured to absorb heat from the refrigerant and send the absorbed heat to a cooling stage.   9. The magnetic working material rotating magnetic refrigerator according to claim 8, wherein a refrigerant flow path of a refrigerant for exchanging heat with the magnetic working material mounted on the rotating magazine type rotating unit rotates together with the rotating magazine type rotating unit. By doing so, the magnetic working material rotating type magnetic refrigerator is capable of switching the flow direction of the refrigerant.

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