Magnetic refrigeration device

Abstract

A magnetic refrigeration device (101) is provided with: a magnetocaloric material (2); a magnetocaloric container (1) that holds a magnetocaloric material and is provided so as to form a flow path for a heat transport medium (4) around the magnetocaloric material; and a magnetic field generation device (3) capable of applying a magnetic field to the magnetocaloric material housed inside the magnetocaloric container and capable of varying the magnetic field. In a first state in which the magnetic field generating device applies a magnetic field to the magnetocaloric material housed in the magnetocaloric container, the magnetic field forms a first magnetic circuit (MC1) by the magnetic field generating device and the magnetocaloric material housed inside the magnetocaloric container. The first magnetic circuit is different from a path through which a magnetic field passes when the magnetic field generating device applies the magnetic field to the magnetocaloric container that does not contain the magnetocaloric material.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a magnetic refrigeration device. BACKGROUND

[0002] A magnetic refrigeration device is a cooling and heating system using a magnetocaloric effect. The magnetic refrigeration device is, for example, a heat pump system that uses a heat transport medium to transport heat energy and cold energy generated in a magnetocaloric material by the magnetocaloric effect due to a change in a magnetic field applied to the magnetocaloric material filled in a magnetic heat container to the outside of the magnetic heat container.

[0003] In Japanese Patent Application Publication No. 2004-317040 (Patent Literature 1), a device is disclosed in which a magnetic path passing through a magnetic heat container and a magnetic yoke is formed, and a magnetic field applied to the magnetic heat container by a magnetic field generator composed of a permanent magnet and an electromagnet is changed.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2004-317040 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the magnetic refrigeration device described in Patent Literature 1, a large magnetic yoke is required on the magnetic path, and it is difficult to achieve weight reduction due to the large magnetic yoke.

[0009] An object of the present application is to provide a magnetic refrigeration device that can be made lighter than conventional magnetic refrigeration devices.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The magnetic refrigeration device of the present disclosure includes a magnetocaloric material, a magnetic heat container that holds the magnetocaloric material and is provided so as to form a flow path of a heat transport medium around the magnetocaloric material, and a magnetic field generating device that can apply a magnetic field to the magnetocaloric material housed in the inside of the magnetic heat container and can change the magnetic field. In a first state in which the magnetic field generating device applies a magnetic field to the magnetocaloric material housed in the magnetic heat container, the magnetic field forms a first magnetic path through the magnetocaloric material housed in the inside of the magnetic heat container. The first magnetic path is different from a path through which the magnetic field passes when the magnetic field generating device applies a magnetic field to the magnetic heat container in which the magnetocaloric material is not housed.

[0012] EFFECTS OF THE INVENTION

[0013] According to the present disclosure, a magnetic refrigeration device that can be made lighter than conventional magnetic refrigeration devices can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a cross-sectional view of the magnetic refrigeration device of Embodiment 1.

[0015] Figure 2 is a cross-sectional view of the magnetic refrigeration device of Embodiment 1.

[0016] Figure 3 is a cross-sectional view of the magnetic refrigeration device of Embodiment 1.

[0017] Figure 4 is a cross-sectional view of a modification of the magnetic refrigeration device of Embodiment 1.

[0018] Figure 5 is a cross-sectional view showing a state in which the magnet is disposed at a first position with respect to the magnetocaloric container in which the magnetocaloric material is not accommodated in the magnetic refrigeration device of Embodiment 1.

[0019] Figure 6 is a cross-sectional view of the magnetic refrigeration device of Embodiment 2.

[0020] Figure 7 is a cross-sectional view of the magnetic refrigeration device of Embodiment 2.

[0021] Figure 8 is a cross-sectional view of the magnetic refrigeration device of Embodiment 2.

[0022] Figure 9 is a cross-sectional view of the magnetic refrigeration device of Embodiment 3.

[0023] Figure 10 is a cross-sectional view of the magnetic refrigeration device of Embodiment 3.

[0024] Figure 11 is a cross-sectional view of the magnetic refrigeration device of Embodiment 3.

[0025] Figure 12 is a cross-sectional view of the magnetic refrigeration device of Embodiment 4.

[0026] Figure 13 is a cross-sectional view of the magnetic refrigeration device of Embodiment 4.

[0027] Figure 14 is a cross-sectional view of the magnetic refrigeration device of Embodiment 5.

[0028] Figure 15 is a cross-sectional view of the magnetic refrigeration device of Embodiment 5.

[0029] Figure 16 is a cross-sectional view of the magnetic refrigeration device of Embodiment 6.

[0030] Figure 17 is a cross-sectional view of the magnetic refrigeration device of Embodiment 6.

[0031] Figure 18It is a cross-sectional view of a magnetic refrigeration device according to a seventh embodiment.

[0032] Figure 19 It is a cross-sectional view of a magnetic refrigeration device according to a seventh embodiment.

[0033] Figure 20 It is a cross-sectional view of a magnetic refrigeration device according to a seventh embodiment.

[0034] Figure 21 It is a cross-sectional view of a magnetic refrigeration device according to the eighth embodiment.

[0035] Figure 22 It is a cross-sectional view of a magnetic refrigeration device according to a ninth embodiment.

[0036] Figure 23 It is a cross-sectional view of a magnetic refrigeration device according to a ninth embodiment.

[0037] Figure 24 This is a cross-sectional view of a magnetic refrigeration device according to a tenth embodiment.

[0038] Figure 25 This is a cross-sectional view of a magnetic refrigeration device according to a tenth embodiment.

[0039] Figure 26 This is a cross-sectional view of a magnetic refrigeration device according to a tenth embodiment.

[0040] Figure 27 This is a cross-sectional view of a magnetic refrigeration device according to a tenth embodiment. DETAILED DESCRIPTION

[0041] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that in the following drawings, the same or corresponding parts are denoted by the same reference numerals, and their description will not be repeated.

[0042] Implementation method 1.

[0043] like Figures 1-3 As shown, the magnetic refrigeration device 101 of the first embodiment mainly includes a magnetic caloric container 1, a magnetic caloric material 2, a magnetic field generator 3, and a heat transfer medium 4. The magnetic field generator 3 includes a magnet 3A and a drive unit 3B. The magnetic refrigeration device 101 does not include a yoke.

[0044] It should be noted that Figure 1 as well as Figure 2 FIG. 1 shows a first state in which the magnet 3A of the magnetic refrigeration device 101 according to the first embodiment is located at a first position relative to the magnetic thermal container 1 . Figure 3 The second state is shown in which the magnet 3A of the magnetic refrigeration device 101 according to the first embodiment is located at the second position relative to the magnetic thermal container 1 . Figure 1 as well as Figure 3 It is a cross-sectional view perpendicular to the central axis CA of the magnetic thermal container 1 .Figure 2 is a cross-sectional view of the magnetic refrigeration device 101 orthogonal to a radial direction (hereinafter, simply referred to as a radial direction) with respect to a central axis CA of the magnetic regenerator 1. In Figure 2 , the illustration of the driving section 3B is omitted.

[0045] As shown in Figure 1 , the magnetic regenerator 1 holds the magnetic regenerator material 2 inside. The magnetic regenerator 1 is provided so as to form a flow path of the heat transport medium 4 around the magnetic regenerator material 2. The magnetic regenerator 1 is, for example, a tubular member. The magnetic regenerator 1 is, for example, a circular tubular member. Note that the magnetic regenerator 1 can also be a square tubular member. From the viewpoint of preventing the diffusion of heat generated in the magnetic regenerator material 2 to the outside of the magnetic regenerator 1, the magnetic regenerator 1 is preferably composed of a material having a lower thermal conductivity (higher heat insulation) than the heat transport medium 4.

[0046] As shown in Figure 1 , in the magnetic regenerator 1, a recessed portion 10 recessed with respect to an outer peripheral surface of the magnetic regenerator 1 is formed on a cross section orthogonal to a central axis CA of the magnetic regenerator 1. The recessed portion 10 has a first facing portion 11 and a second facing portion 12 facing each other in a circumferential direction (hereinafter, simply referred to as a circumferential direction) with respect to the central axis CA. The recessed portion 10 also has a connecting portion 13 connecting between the first facing portion 11 and the second facing portion 12. The connecting portion 13 extends, for example, in a direction orthogonal to the above-described radial direction. The connecting portion 13 is disposed, for example, on the central axis CA.

[0047] The magnetic regenerator material 2 is composed of a magnetic body capable of obtaining a magnetocaloric effect. The material constituting the magnetic regenerator material 2 can be any material capable of obtaining a magnetocaloric effect. For example, in a case where a high magnetocaloric effect is required, it is preferable to select a material constituting the magnetic regenerator material 2 from a material having a high magnetic permeability. As a material constituting such a magnetic regenerator material 2, for example, an alloy containing gadolinium (Gd) or an alloy containing lanthanum (La) can be given.

[0048] The shape of the magnetic regenerator material 2 can be arbitrarily selected, and is, for example, a granular shape. It is preferable that the shape of the magnetic regenerator material 2 be a spherical shape. The magnetic regenerator material 2 is filled and fixed inside the magnetic regenerator 1. In the inside of the magnetic regenerator 1, a gap in which the heat transport medium 4 can flow is formed around the magnetic regenerator material 2.

[0049] From the perspective of suppressing the magnetic resistance of the first magnetic circuit MC1, which will be described later, formed in the first state, the magnetocaloric material 2 is preferably densely packed inside the magnetocaloric container 1. In the case where the magnetocaloric material 2 is granular, from the perspective of reducing the number of times the magnetocaloric material passes through the gaps between the particles and suppressing the above-mentioned magnetic resistance, the particle size (equivalent circle diameter) of the magnetocaloric material 2 is preferably 100 μm or more. On the other hand, from the perspective of efficiently transferring the heat energy or cold energy generated by the magnetocaloric material 2 to the heat transfer medium 4, the particle size of the magnetocaloric material 2 is preferably 5 mm or less. For example, when the magnetocaloric material 2 is a gadolinium-based alloy, the particle size of the magnetocaloric material 2 is preferably about 1 mm.

[0050] The magnetic field generating device 3 is capable of applying a magnetic field to the magnetic thermal material 2 housed within the magnetic thermal container 1 and of varying this magnetic field. The magnetic field generating device 3 includes, for example, a magnet 3A and a drive unit 3B. The magnet 3A generates a magnetic field within the magnetic thermal container 1. The drive unit 3B, for example, reciprocates the magnet 3A in direction B. Direction B is the direction perpendicular to the central axis CA and extending along the first opposing portion 11 and the second opposing portion 12. The drive unit 3B is, for example, an actuator mounted on the magnet 3A. It should be noted that the drive unit 3B can also reciprocate the magnetic thermal container 1 relative to the magnet 3A.

[0051] The magnet 3A is, for example, a permanent magnet. The magnet 3A may also be, for example, a neodymium magnet or a ferrite magnet. The magnet 3A can change its relative position relative to the magnetic thermal container 1. The relative position of the magnet 3A relative to the magnetic thermal container 1 is controlled by the drive unit 3B. Figure 1 The first position shown and Figure 3 For example, the magnet 3A can be moved relative to the magnetic thermal capacitor 1.

[0052] like Figure 1As shown, in the first state, magnet 3A, located at a first position relative to magnetic thermal container 1, is housed in recess 10, applying a magnetic field to the magnetic thermal material 2 housed in magnetic thermal container 1. In the first state, the north pole of magnet 3A faces the first facing portion 11 in the circumferential direction, and the south pole of magnet 3A faces the second facing portion 12 in the circumferential direction. In the first state, the side surface of magnet 3A along the magnetization direction faces the connecting portion 13 of recess 10 in the radial direction. In the first state, the north pole of magnet 3A can contact the first facing portion 11, the south pole of magnet 3A can contact the second facing portion 12, and the side surface of magnet 3A can contact the connecting portion 13. The surface area of ​​the north pole of magnet 3A is, for example, equal to the outer surface area of ​​the first facing portion 11 facing into recess 10. The surface area of ​​the south pole of magnet 3A is, for example, equal to the outer surface area of ​​the second facing portion 12 facing into recess 10. When the recess 10 and the magnet 3A of the magnetic thermal container 1 as a circular tubular member are configured in this manner, relatively uniform magnetic strength can be imparted to the magnetic thermal material 2 filled in the magnetic thermal container 1 , thereby improving the utilization efficiency of the magnetic thermal material 2 .

[0053] like Figure 1 As shown, in the first state, the magnetic field generated by the magnet 3A within the magnetic thermal container 1 passes through the magnetic thermal material 2 and the magnet 3A housed within the magnetic thermal container 1, thereby forming a closed first magnetic circuit MC1. The first magnetic circuit MC1 passes only through the magnet 3A, the first facing portion 11, the second facing portion 12, and the interior of the magnetic thermal container 1.

[0054] The heat transfer medium 4 is filled in the gaps of the magnetocaloric material 2 inside the magnetocaloric container 1. The heat transfer medium 4 transfers the heat energy and cold energy generated by the magnetocaloric effect in the magnetocaloric material 2. The heat transfer medium 4 is filled in the gaps of the magnetocaloric material 2 inside the magnetocaloric container 1 in the direction A along the central axis C (refer to Figure 2 . Hereinafter referred to as axial A) circulation.

[0055] like Figure 2 As shown, the magnetic thermal container 1 further comprises a first inlet and outlet portion OP1 and a second inlet and outlet portion OP2. The first inlet and outlet portion OP1 is provided at one end of the magnetic thermal container 1 in the axial direction. The second inlet and outlet portion OP2 is provided at the other end of the magnetic thermal container 1 in the axial direction. The heat transfer medium flows from the first inlet and outlet portion OP1 into the interior of the magnetic thermal container 1, and the heat transfer medium flows along the interior of the magnetic thermal container 1. Figure 2 , and flows out from the second inlet and outflow portion OP2 to the outside of the magnetic thermal container 1. Alternatively, the heat transfer medium 4 flows into the interior of the magnetic thermal container 1 from the second inlet and outflow portion OP2, flows in the direction opposite to the arrow F inside the magnetic thermal container 1, and flows out from the first inlet and outflow portion OP1 to the outside of the magnetic thermal container 1.

[0056] likeFigure 2 As shown, the recess 10 extends, for example, along the axial direction A. The recess 10 extends, for example, from the first inflow and outflow portion OP1 to the second inflow and outflow portion OP2. In other words, recesses 10 are also formed from the first inflow and outflow portion OP1 to the second inflow and outflow portion OP2.

[0057] like Figure 3 As shown, in the second state, the magnet 3A located in the second position relative to the magnetic thermal container 1 is disposed outside the recess 10. In the second state, the magnetic field applied to the magnetic thermal material 2 in the first state is removed from the magnetic thermal material 2. From a different perspective, in the second state, the magnet 3A located in the second position relative to the magnetic thermal container 1 does not apply a magnetic field to the magnetic thermal material 2 housed in the magnetic thermal container 1 to a degree that enables the magnetic thermal material 2 to exhibit a magnetocaloric effect.

[0058] Figures 1-3 The magnetic refrigeration device 101 shown is connected to a pump for causing the heat transfer medium 4 to flow into the first inflow / outflow portion OP1 or the second inflow / outflow portion OP2 or to flow out from the first inflow / outflow portion OP1 or the second inflow / outflow portion OP2 .

[0059] On the other hand, the magnetic refrigeration device 101 may further include a pump for causing the heat transfer medium 4 to flow into the first inlet and outlet portion OP1 or the second inlet and outlet portion OP2 or causing the heat transfer medium 4 to flow out from the first inlet and outlet portion OP1 or the second inlet and outlet portion OP2 .

[0060] like Figure 4 As shown, the magnetic refrigeration device 101 may also include a pump 6 for allowing the heat transfer medium 4 to flow into the first inlet and outlet portion OP1. For example, the magnetic refrigeration device 101 may also be configured to further include a first pipe 61 connected to the first inlet and outlet portion OP1 and a second pipe 62 connected to the second inlet and outlet portion OP2, and the pump 6 is provided on the first pipe 61. The pump 6 is connected to the first inlet and outlet portion OP1. Figure 4 The heat transfer medium 4 in the first pipe 61, the magnetic thermal container 1, and the second pipe 62 is transported in the direction of arrow F. It should be noted that the first pipe 61 is connected to, for example, a first heat exchanger (not shown). The second pipe 62 is connected to, for example, a second heat exchanger (not shown).

[0061] Next, the operation of the magnetic refrigeration device 101 will be described. Assuming the aforementioned second state as the initial state, in the second state, the magnetocaloric material 2 and the heat transfer medium 4 are at the same temperature, the magnet 3A is positioned at the second position relative to the magnetocaloric container 1, and the magnetic field is removed from the magnetocaloric material 2.

[0062] First, the magnet 3A is moved from the second position to the first position relative to the magnetic heat container 1 by the driving section 3B, and is inserted from the outside to the inside of the recess 10 of the magnetic heat container 1. Thereby, the second state in which the magnetic field is removed from the magnetic heat material 2 housed in the magnetic heat container 1 is shifted to the first state in which the magnetic field is applied to the magnetic heat material 2 housed in the magnetic heat container 1. At the time of shifting from the second state to the first state, the magnetic heat material 2 generates heat, and the temperature of the magnetic heat material 2 rises. The magnetic heat material 2 becomes high temperature compared to the adjacent heat transport medium 4, and therefore, heat energy is transferred from the magnetic heat material 2 to the heat transport medium 4, and the temperature of the heat transport medium 4 rises. The heat transport medium 4 after the temperature rise is transported from the magnetic heat container 1 to the outside by the pump 6, and is supplied to the external equipment (for example, the second heat exchanger) of the magnetic heat container 1. At the same time, new heat transport medium 4 flows into the magnetic heat container 1. The magnetic heat material 2 also transfers heat energy to the newly flowed-in heat transport medium 4. The heat transport medium 4 after the temperature rise is transported from the magnetic heat container 1 to the outside by the pump 6. Through the above process, the temperature of the magnetic heat material 2 is eventually lowered to the temperature of the heat transport medium 4 flowed into the inside of the magnetic heat container 1.

[0063] Next, the magnet 3A is moved from the first position to the second position relative to the magnetic heat container 1 by the driving section 3B, and is taken out from the inside to the outside of the recess 10 of the magnetic heat container 1. Thereby, the first state in which the magnetic field is applied to the magnetic heat material 2 housed in the magnetic heat container 1 is shifted to the second state in which the magnetic field is removed from the magnetic heat material 2 housed in the magnetic heat container 1. At the time of shifting from the first state to the second state, the magnetic heat material 2 absorbs heat, and the temperature of the magnetic heat material 2 falls. The magnetic heat material 2 becomes low temperature compared to the adjacent heat transport medium 4, and therefore, the magnetic heat material 2 absorbs heat from the heat transport medium 4, and the temperature of the heat transport medium 4 falls. The heat transport medium 4 after the temperature fall is transported from the magnetic heat container 1 to the outside by the pump 6, and is supplied to the external equipment (for example, the first heat exchanger) of the magnetic heat container 1. At the same time, new heat transport medium 4 flows into the magnetic heat container 1. The magnetic heat material 2 also transfers heat energy to the newly flowed-in heat transport medium 4. The heat transport medium 4 after the temperature rise is transported from the magnetic heat container 1 to the outside by the pump 6. Through the above process, the temperature of the magnetic heat material 2 is eventually raised to the temperature of the heat transport medium 4 flowed into the inside of the magnetic heat container 1.

[0064] By repeating the above process, according to the magnetic refrigeration device 101, it is possible to alternately take out the high-temperature heat transport medium 4 and the low-temperature heat transport medium 4 from the magnetic heat container 1. Therefore, the magnetic refrigeration device 101 functions as a heat pump.

[0065] At the time of switching between the first state and the second state, the direction in which the pump 6 transports the heat transport medium 4 can also not be switched. The direction in which the pump 6 transports the heat transport medium 4 in the first state can also be the same as the direction in which the pump 6 transports the heat transport medium 4 in the second state.

[0066] On the other hand, at the time of switching between the first state and the second state, the direction in which the pump 6 transports the heat transport medium 4 can also be switched. The direction in which the pump 6 transports the heat transport medium 4 in the second state can also be opposite to the direction in which the pump 6 transports the heat transport medium 4 in the first state. In this way, it is possible to make one side high in temperature and the other side low in temperature with respect to the magnetocaloric container 1. For example, it is possible to take the first heat exchanger connected to the first inflow / outflow portion OP1 via the first pipe 61 as a heat exchanger on the low-temperature side and to take the second heat exchanger connected to the second inflow / outflow portion OP2 via the second pipe 62 as a heat exchanger on the high-temperature side. In this case, the process in which the magnetocaloric material 2 is excited and the process in which the magnetocaloric material 2 is demagnetized are alternately and continuously repeated, the magnetocaloric material 2 functions as a heat accumulator, and it is possible to form a temperature difference above the temperature change obtained in one cycle between one side and the other side with respect to the magnetocaloric container 1.

[0067] The state of the heat transport medium 4 at the time of the above operation can be a liquid, can be a gas, or can be a gas-liquid mixed state. In the case where the heat transport medium 4 is in a gas-liquid mixed state, the heat transport medium 4 in a liquid state can be phase-changed into a gas state by absorbing heat from the magnetocaloric material 2. In this case, since it is possible to transport latent heat accompanying the gas-liquid phase change of the heat transport medium 4, it is possible to suppress the temperature rise of the heat transport medium 4 and to increase the heat transport amount per unit mass of the heat transport medium 4, as compared with the case where the heat transport medium 4 does not undergo a phase change at the time of the above operation.

[0068] Next, the effects of the magnetic refrigeration device 101 will be described.

[0069] Figure 5 indicates a state in which the magnet 3A is disposed at the first position with respect to the magnetocaloric container 1 in which the magnetocaloric material 2 is not accommodated. In other words, Figure 5 The magnetocaloric container 1 illustrated in Figure 1 The magnetocaloric container 1 illustrated in differs only in that the magnetocaloric material 2 is not accommodated in the inside of the magnetocaloric container 1. As Figure 5 As illustrated in the magnetic refrigeration device 101, even in the case where the magnet 3A is disposed in this way, it is possible to form the first magnetic circuit in the first state as illustrated in Figure 1

[0070] ​Specifically, the recess 10 is formed in the magnetic heat container 1, and in the first state, the magnet 3A is housed in the recess 10. The N pole of the magnet 3A faces the first facing portion 11, and the S pole of the magnet 3A faces the second facing portion 12. Thus, the path of the magnetic field applied to the magnetic heat material 2 by the magnet 3A can be formed so as to pass through the entire body of the magnetic heat material 2 housed in the magnetic heat container 1.

[0071] As a result, in the magnetic refrigeration device 101, a magnetic yoke necessary in the conventional magnetic refrigeration device to form the path of the magnetic field applied to the magnetic heat material by the magnet is not required, and thus the magnetic refrigeration device 101 can be made lighter than the conventional magnetic refrigeration device.

[0072] <Modification Example>

[0073] The magnetic refrigeration device 101 can be modified as follows.

[0074] A not-shown cover layer can also be formed on the surface of the magnetic heat material 2. The cover layer is provided to suppress corrosion of the magnetic heat material 2 due to contact with the heat transport medium 4. The material constituting the cover layer can be any material capable of suppressing the above-mentioned corrosion, and can be a resin material or a metal material. In addition, the heat transport medium 4 can also contain an anticorrosive agent for suppressing the above-mentioned corrosion. When the cover layer composed of a resin material is formed on the surface of the magnetic heat material 2, the electrical conductivity between the particles of the magnetic heat material 2 is reduced, and the eddy current loss generated in the magnetic heat material 2 accompanying a change in the magnetic field can be reduced.

[0075] The material constituting the magnetic heat material 2 can also be a material whose magnetic permeability is low in a state where the magnetocaloric effect of the magnetic heat material 2 is low. In the case where the magnetic permeability of the magnetic heat material 2 is low, a strong magnetic path is not formed inside the magnetic heat container 1 housing the magnetic heat material 2 even in the above-mentioned first state, and thus a strong magnetic field is not applied to the magnetic heat material 2. In the case where the magnetocaloric effect generated by the magnetic heat material 2 is low, this structure is preferable from the viewpoint of suppressing power loss due to generation of an eddy current in the magnetic heat material 2 when a magnetic field is applied in the first state.

[0076] The magnet 3A is not limited to a permanent magnet. The magnet 3A can have any structure as long as it can impart a change in the magnetic field to the magnetic heat material 2, and can be, for example, an electromagnet, more specifically, a superconducting electromagnet. In the case where the magnet 3A is an electromagnet, the magnet 3A can be fixed to the recess 10. The magnetic refrigeration device 101 can also not be provided with the driving portion 3B. Even in this case, the magnetic field applied to the magnetic heat material 2 housed in the magnetic heat container 1 can be varied by adjusting the amount of current flowing in the coil.

[0077] Embodiment 2.

[0078] As Figures 6-8As shown, the magnetic refrigeration device 102 of Embodiment 2 has the same structure and effects as the magnetic refrigeration device 101 of Embodiment 1, and functions similarly to the magnetic refrigeration device 101, unless otherwise specified.

[0079] Note that, Figure 6 and Figure 7 indicates a first state in which the magnet 3A of the magnetic refrigeration device 102 of Embodiment 2 is positioned at a first position with respect to the magnetic heat reservoir 1. Figure 8 indicates a second state in which the magnet 3A of the magnetic refrigeration device 102 is positioned at a second position with respect to the magnetic heat reservoir 1. Figure 6 and Figure 8 is a cross-sectional view orthogonal to the central axis CA of the magnetic heat reservoir 1. Figure 7 is a cross-sectional view of the magnetic refrigeration device 102 orthogonal to the radial direction of the magnetic heat reservoir 1. In Figures 6-8 , the illustration of the drive unit 3B is omitted.

[0080] In the magnetic refrigeration device 102 of Embodiment 2, the magnetic heat reservoir 1 has a C-shape in a cross section orthogonal to the central axis CA of the magnetic heat reservoir 1. The recess 10 of the magnetic heat reservoir 1 is formed as a gap between both ends of the C-shape. The recess 10 is recessed toward the central axis CA with respect to the outer peripheral surface of the magnetic heat reservoir 1 that faces outward with respect to the central axis CA. The first facing portion 11 and the second facing portion 12 of the recess 10 of the magnetic heat reservoir 1 constitute both ends of the C-shape. In the cross section orthogonal to the central axis CA, the end portions on the inner side (the central axis CA side) of the first facing portion 11 and the second facing portion 12 are connected to each other via the inner side portions extending in the circumferential direction at positions inward of the inner space of the magnetic heat reservoir 1. In the cross section orthogonal to the central axis CA, the end portions on the outer side of the first facing portion 11 and the second facing portion 12 are connected to each other via the outer side portions extending in the circumferential direction on the outer side with respect to the inner space of the magnetic heat reservoir 1.

[0081] As shown in Figure 6 , in the magnetic refrigeration device 102, when the magnet 3A is disposed at the first position with respect to the magnetic heat reservoir 1, the magnet 3A and the magnetic heat reservoir 1 are disposed in a ring shape in the cross section orthogonal to the central axis CA. In such a magnetic refrigeration device 102, a longer first magnetic path MC1 can be formed compared to the magnetic refrigeration device 101. As a result, when the magnetic refrigeration device 102 and the magnetic refrigeration device 101 are compared in which the cross-sectional areas of the first magnetic paths MC1 are equal to each other, the amount of the magnetic heat material 2 that can be accommodated in the magnetic heat reservoir 1 of the magnetic refrigeration device 102 can be larger than the amount of the magnetic heat material 2 that can be accommodated in the magnetic heat reservoir 1 of the magnetic refrigeration device 101.

[0082] As shown in Figure 6As shown, the magnet 3A and the magnetic thermal container 1 may be arranged in a square ring shape on a cross section perpendicular to the central axis CA. It should be noted that the magnet 3A and the magnetic thermal container 1 may also be arranged in a circular ring shape on a cross section perpendicular to the central axis CA.

[0083] In a cross section perpendicular to the central axis CA, the first facing portion 11 and the second facing portion 12 are connected, for example, at the shortest distance between the inner and outer portions of the magnetic thermal container 1. In a cross section perpendicular to the central axis CA, the width of each surface of the north and south poles of the magnet 3A is, for example, equal to the length of the first facing portion 11 and the second facing portion 12, as well as the shortest distance between the inner and outer portions of the magnetic thermal container 1. This allows a uniform magnetic field to be applied to the magnetic thermal material 2 regardless of the position within the magnetic thermal container 1.

[0084] like Figure 6 As shown in FIG. 1 , in the first state, a space is formed inside the magnetic thermal container 1 and the magnet 3A. The space extends in the axial direction. Figure 8 As shown, in the second state, magnet 3A moves away from the aforementioned space, so the aforementioned space is also maintained in the second state. The use of the aforementioned space can be arbitrarily selected. For example, the aforementioned drive unit of magnetic field generator 3 can be housed in the aforementioned space. As another example, the aforementioned space can be filled with a component to enhance the strength of magnetic thermal container 1, such as a resin material or cement. As yet another example, the aforementioned space can be filled with piping for the flow of the heat transfer medium as a return path for the heat transfer medium flowing out of magnetic thermal container 1.

[0085] Magnetic refrigeration device 102 can also be modified in the same manner as magnetic refrigeration device 101. In magnetic refrigeration device 102, magnet 3A can also be an electromagnet. In this case, recess 10 can be omitted from magnetic thermal container 1, and the coil contained in magnet 3A can be wound around a portion of the circumference of the annular magnetic thermal container 1. This method can also form a first magnetic circuit.

[0086] Implementation method 3.

[0087] like Figures 9-11 As shown, the magnetic refrigeration device 103 according to the third embodiment has the same structure and effects as the magnetic refrigeration device 101 according to the first embodiment, and operates in the same manner as the magnetic refrigeration device 101 unless otherwise specified.

[0088] It should be noted that Figure 9 as well as Figure 10 FIG. 1 shows a first state in which the magnet 3A of the magnetic refrigeration device 103 according to the third embodiment is located at a first position relative to the magnetic thermal container 1 . Figure 11a second state indicating that the magnet 3A of the magnetic refrigeration device 103 is located at the second position with respect to the magnetic regenerator 1. Figure 9 and Figure 11 is a cross-sectional view orthogonal to the center axis CA of the magnetic regenerator 1. Figure 10 is a cross-sectional view orthogonal to the radial direction of the magnetic regenerator 1. In Figures 9-11 , the illustration of the driving section 3B is omitted.

[0089] In the magnetic refrigeration device 103 of Embodiment 3, the magnetic regenerator material 2 is configured of a plurality of plate-like members 20 extending in the direction along the center axis inside the magnetic regenerator 1.

[0090] In a cross section orthogonal to the center axis of the magnetic regenerator 1, one end of each of the plurality of plate-like members 20 is connected to the inner peripheral surface of the first facing portion 11. In the above cross section, the other end of each of the plurality of plate-like members 20 is connected to the inner peripheral surface of the second facing portion 12. In the above cross section, the plurality of plate-like members 20 are arranged at intervals from each other in the radial direction with respect to the center axis CA. The gap formed between the two adjacent plate-like members 20 constitutes the flow path of the heat transport medium 4. As Figure 10 indicated, the gap formed between the two adjacent plate-like members 20 is connected to the first inflow and outflow portion OP1 and the second inflow and outflow portion OP2.

[0091] From a different viewpoint, a plurality of slits are formed in the magnetic regenerator material 2 of the magnetic refrigeration device 103. Each of the slits constitutes the flow path of the heat transport medium 4.

[0092] In the magnetic refrigeration device 103, if the magnetic permeability of the magnetic regenerator material 2 is higher than the magnetic permeability of the heat transport medium 4, the magnetism of the magnet 3A can be concentrated to the magnetic regenerator material 2. Therefore, in the magnetic refrigeration device 103, the first magnetic circuit MC1 can be formed so as not to pass through the flow path of the heat transport medium 4, but to pass through only the magnet 3A, the first facing portion 11, the magnetic regenerator material 2, and the second facing portion 12. Therefore, the magnetic resistance of the first magnetic circuit MC1 formed in the magnetic refrigeration device 103 can be lower than the magnetic resistance of the first magnetic circuit MC1 formed in the magnetic refrigeration device 101. In addition, the cross-sectional area (flow path cross-sectional area) of the space formed between the two adjacent plate-like members 20 in the magnetic refrigeration device 103 can be set to be larger than the cross-sectional area of the space formed between the particles of the magnetic regenerator material 2 in the magnetic refrigeration device 101. In this case, the pressure loss of the heat transport medium 4 flowing in the space formed between the two adjacent plate-like members 20 in the magnetic refrigeration device 103 can be smaller than the pressure loss of the heat transport medium 4 flowing in the space formed between the particles of the magnetic regenerator material 2 in the magnetic refrigeration device 101.

[0093] The thickness of each of the plurality of plate-like members 20 affects the heat transfer characteristics (heat dissipation efficiency) between the magnetocaloric material 2 and the heat transport medium 4. The thickness of each of the plurality of plate-like members 20 is, for example, 0.5 mm or more and 5.0 mm or less. The width of the above-described space formed between two adjacent plate-like members 20 (the interval of the two adjacent plate-like members 20) affects the pressure loss of the heat transport medium 4 flowing in the space, and the heat transfer characteristics (heat dissipation efficiency) between the magnetocaloric material 2 and the heat transport medium 4. If the width of the above-described space is too narrow, the pressure loss increases, and the heat dissipation efficiency decreases. If the width of the above-described space is too wide, the volume of the magnetocaloric material 2 housed in the magnetocaloric container 1 becomes small, and thus, the volume utilization of the magnetocaloric container 1 decreases. The interval between the two adjacent plate-like members 20 can be set based on a comparison with the thickness of the plate-like members 20, and is, for example, 0.5 mm or more and 5.0 mm or less. Since the magnetic permeability of each plate-like member 20 is larger than the magnetic permeability between the two adjacent plate-like members 20, the magnetic flux applied by the magnet 3A is concentrated to each plate-like member 20. In order to increase the magnetic flux density of each plate-like member 20, for example, the interval between the two adjacent plate-like members 20 can be equal to the thickness of the plate-like members 20, so that the density of the magnetic flux passing through each plate-like member 20 is about twice the magnetic flux density of the magnet 3A.

[0094] In the magnetic refrigeration device 103, the distance between the two adjacent plate-like members 20 can also be constant in at least either of the circumferential direction and the axial direction. The distance between the two adjacent plate-like members 20 can also not be constant in each of the circumferential direction and the axial direction. As long as at least a part of the two adjacent plate-like members 20 are arranged apart from each other with an interval and a flow path of the heat transport medium 4 can be formed, a part of each of the two adjacent plate-like members 20 can also be in contact with each other.

[0095] In the magnetic refrigeration device 103, one end and the other end of a part of the plate-like members 20 can also be connected to the connection portion 13 in a cross section orthogonal to the center axis CA.

[0096] The magnetic refrigeration device 103 can also have the same structure as the magnetic refrigeration device 102 except that the magnetocaloric material 2 constitutes the plurality of plate-like members 20.

[0097] Embodiment 4.

[0098] As Figure 12 shown, the magnetic refrigeration device 104 of Embodiment 4 has the same structure and effects as the magnetic refrigeration device 101 of Embodiment 1 and operates similarly to the magnetic refrigeration device 101, unless specifically described otherwise.

[0099] Note that, Figure 12A first state in which the magnet 3A of the magnetic refrigeration device 104 is positioned at a first position with respect to the magnetic heat container 1. Figure 12 is a cross-sectional view of the magnetic refrigeration device 104 taken along a direction orthogonal to the central axis CA of the magnetic heat container 1. In Figure 12 , the illustration of the driving portion 3B is omitted.

[0100] As shown in Figure 12 , the magnetic refrigeration device 104 is provided with a magnetic yoke 7. The magnetic yoke 7 is configured to surround the magnetic heat container 1 in a cross section taken along a direction orthogonal to the central axis CA of the magnetic heat container 1. The magnetic yoke 7 is configured to surround the magnetic heat container 1 as viewed in a direction along the central axis CA of the magnetic heat container 1. The magnetic yoke 7 has a C shape in the cross section taken along a direction orthogonal to the central axis CA. In the cross section taken along a direction orthogonal to the central axis CA, the magnetic yoke 7 has a third facing portion 71 facing the first facing portion 11 of the recess 10 of the magnetic heat container 1, a fourth facing portion 72 facing the second facing portion 12 of the recess 10, and a connecting portion 73 connecting the third facing portion 71 and the fourth facing portion 72. The connecting portion 73 is disposed on a side opposite to the recess 10 with respect to the central axis CA. In the second state, the magnet 3A is disposed on a side opposite to the magnetic yoke 7 with respect to the magnetic heat container 1. The material constituting the magnetic yoke 7 is a ferromagnetic substance.

[0101] The distance between the third facing portion 71 and the fourth facing portion 72 of the magnetic yoke 7 and the magnetic heat container 1 is set so that the magnetic reluctance of a magnetic path passing through the magnet 3A, the magnetic heat container 1, and the magnetic yoke 7 is larger than the magnetic reluctance of the first magnetic path MC1 in the first state in which the magnetic permeability of the magnetic material 2 is not reduced. As a result, as shown in Figure 12 , the first magnetic path MC1 is formed in the first state in which the magnetic permeability of the magnetic material 2 is not reduced.

[0102] The thickness of the magnetic yoke 7 can be set in accordance with the allowable value of magnetic leakage to the outside in the above first state, the amount of reduction in the magnetic permeability due to a temperature change or aging expected in the magnetic material 2, and the like, as long as the thickness is a thickness that does not cause magnetic saturation in the above first state. From such a viewpoint, the expected thickness of the magnetic yoke 7 is, for example, 10 mm or less.

[0103] In the magnetic refrigeration device 104, the material constituting the magnetic material 2 can also be a material whose magnetic permeability easily changes due to a temperature change, aging, and the like. In the case where the magnetic permeability of the magnetic material 2 is reduced due to a temperature change or aging, depending on the amount of reduction, the first magnetic path MC1 can not be formed even in the first state, and the magnetism of the magnet 3A can leak to the outside of the magnetic heat container 1. The magnetic yoke 7 is used to prevent the magnetism of the magnet 3A from leaking to the outside of the magnetic refrigeration device 104 in such a case.

[0104] Figure 13 indicates thatFigure 12 The third magnetic path MC3 is formed in the first state in the case where the magnetic permeability of the magnetic regenerator 2 decreases in the magnetic refrigeration device 104 shown. In the magnetic refrigeration device 104, when the magnetic permeability of the magnetic regenerator 2 decreases and the magnetic resistance of the first magnetic path MC1 increases, the magnetic resistance of the magnetic path passing through the magnet 3A, the first facing portion 11, a portion of the magnetic regenerator 2 inside the magnetic regenerator container 1, the magnetic yoke 7, and the second facing portion 12 is smaller than the magnetic resistance of the first magnetic path MC1. As a result, in the magnetic refrigeration device 104, even in the case where the magnetic permeability of the magnetic regenerator 2 decreases, the magnetic leakage to the outside of the magnetic refrigeration device 104 can be prevented. Figure 13 As shown, in the magnetic refrigeration device 104, in the case where the magnetic permeability of the magnetic regenerator 2 decreases, the third magnetic path MC3 passing through the magnet 3A, the first facing portion 11, the magnetic regenerator 2, the outer portion of the magnetic regenerator container 1, the magnetic yoke 7, the outer portion of the magnetic regenerator container 1, the magnetic regenerator 2, and the second facing portion 12 can be formed. As a result, in the magnetic refrigeration device 104, even in the case where the magnetic permeability of the magnetic regenerator 2 decreases, the magnetic leakage to the outside of the magnetic refrigeration device 104 can be prevented.

[0105] The magnetic refrigeration device 104 can have the same structure as the magnetic refrigeration device 102 or the magnetic refrigeration device 103 except that the magnetic yoke 7 is provided.

[0106] The magnetic yoke 7 of the magnetic refrigeration device 104, like the first magnetic yoke 7A and the second magnetic yoke 7B of the magnetic refrigeration device 107 of Embodiment 7 described later, can include a plurality of protruding portions protruding toward the magnetic regenerator container 1 and arranged at intervals from each other in the direction along the central axis CA, and a coil wound around each of the plurality of protruding portions. The magnetic refrigeration device 104 can further include a measurement unit that measures an induced electromotive force of the coil due to a magnetic field variation of the first magnetic path MC1.

[0107] Embodiment 5.

[0108] As shown in Figure 14 and Figure 15 The magnetic refrigeration device 105 of Embodiment 5 has the same structure and effects as the magnetic refrigeration device 101 of Embodiment 1 and operates in the same manner as the magnetic refrigeration device 101, unless otherwise specified.

[0109] As shown in Figure 14 and Figure 15As shown, the magnetic refrigeration device 105 includes a first magnetic thermal container 1A and a second magnetic thermal container 1B. The first magnetic thermal container 1A and the second magnetic thermal container 1B each have a structure equivalent to the magnetic thermal container 1 of the magnetic refrigeration device 101. The first magnetic thermal container 1A and the second magnetic thermal container 1B are arranged so that their respective central axes CA extend parallel to each other, and their respective recesses 10 face each other. Preferably, the first magnetic thermal container 1A and the second magnetic thermal container 1B are arranged line-symmetrically with respect to a perpendicular bisector, which is a perpendicular bisector with respect to a line segment connecting the central axes CA of the first magnetic thermal container 1A and the second magnetic thermal container 1B.

[0110] The magnetic refrigeration device 105 is configured to switch the first magnetic thermal container 1A and the second magnetic thermal container 1B by reciprocating the magnet 3A relative to each other. Figure 14 The third state shown and Figure 15 The fourth state is shown.

[0111] exist Figure 14 In the third state shown, the magnet 3A is positioned in the first position relative to the first magnetic thermal capacitor 1A and in the second position relative to the second magnetic thermal capacitor 1B. In the third state, the first magnetic circuit MC1 is formed only within the first magnetic thermal capacitor 1A, of the first and second magnetic thermal capacitors 1A and 1B.

[0112] exist Figure 15 In the fourth state shown, the magnet 3A is positioned at the second position relative to the first magnetic thermal capacitor 1A and at the first position relative to the second magnetic thermal capacitor 1B. In the fourth state, the first magnetic circuit MC1 is formed only within the second magnetic thermal capacitor 1B, of the first and second magnetic thermal capacitors 1A and 1B.

[0113] In the magnetic refrigeration device 105, by repeatedly switching between the third and fourth states, the magnetocaloric material 2 housed in the first and second magnetocaloric containers 1A, 1B, respectively, alternately generates and absorbs heat. Therefore, the magnetic refrigeration device 105 can function as a heat pump for the magnetic refrigeration cycle device on its own. In contrast, the magnetic refrigeration device 101 requires at least two magnetic refrigeration devices 101 to function as a heat pump for the magnetic refrigeration cycle device. When one magnetic refrigeration device 101 is in the first state, the other magnetic refrigeration device 101 must be in the second state. When one magnetic refrigeration device 101 is switched to the second state, the other magnetic refrigeration device 101 must simultaneously switch to the first state. Therefore, by using the magnetic refrigeration device 105 as the heat pump for the magnetic refrigeration cycle device, the number of components can be reduced compared to a case where the heat pump for the magnetic refrigeration cycle device is implemented using two magnetic refrigeration devices 101. Specifically, the number of magnets 3A used can be reduced.

[0114] The distance between the first and second magnetic thermal containers 1A, 1B in direction B is set so as not to form a magnetic path passing through the first and second magnetic thermal containers 1A, 1B. If the first and second magnetic thermal containers 1A, 1B are each relatively thin and the magnetic resistance of the magnetic path passing through the first and second magnetic thermal containers 1A, 1B in the thickness direction is low, the distance between the first and second magnetic thermal containers 1A, 1B in direction B may be, for example, 1 mm to 10 mm. If the first and second magnetic thermal containers 1A, 1B are each relatively thick and the magnetic resistance of the magnetic path passing through the first and second magnetic thermal containers 1A, 1B in the thickness direction is high, the first magnetic thermal container 1A may be in contact with the second magnetic thermal container 1B.

[0115] At least one of the first magnetic thermal container 1A and the second magnetic thermal container 1B of the magnetic refrigeration device 105 may have the same structure as the magnetic thermal container 1 of the magnetic refrigeration device 102 , the magnetic refrigeration device 103 , or the magnetic refrigeration device 104 .

[0116] The magnetic refrigeration device 105 may further include a pump for transporting the heat transfer medium 4 to the first magnetic thermal container 1A and the second magnetic thermal container 1B. The magnetic refrigeration device 105 may further include a pump for transporting the heat transfer medium 4 to the first magnetic thermal container 1A and a pump for transporting the heat transfer medium 4 to the second magnetic thermal container 1B.

[0117] Implementation method 6.

[0118] like Figure 16 As shown, the magnetic refrigeration device 106 of the sixth embodiment has the same structure and effect as the magnetic refrigeration device 105 of the fifth embodiment unless otherwise specified, and operates in the same manner as the magnetic refrigeration device 105. Figure 16 The third state shows the magnet 3A of the magnetic refrigeration device 106 being located at the first position relative to the first magnetic thermal container 1A.

[0119] like Figure 16 As shown, the magnetic refrigeration device 106 differs from the magnetic refrigeration device 105 in that it further includes a first yoke 7A and a second yoke 7B. The first yoke 7A and the second yoke 7B each have the same structure as the yoke 7 of the magnetic refrigeration device 104 of the fourth embodiment. The relationship between the first yoke 7A and the first magnetic thermal container 1A, and the relationship between the second yoke 7B and the second magnetic thermal container 1B are both equivalent to the relationship between the magnetic thermal container 1 and the yoke 7 in the magnetic refrigeration device 104.

[0120] In a cross section orthogonal to the central axis CA, the first magnetic yoke 7A is configured to surround the first magnetic regenerator 1A, and the second magnetic yoke 7B is configured to surround the second magnetic regenerator 1B. In the above-mentioned cross section, the first magnetic yoke 7A and the second magnetic yoke 7B are configured in a ring shape so as to surround the entirety of the first magnetic regenerator 1A, the second magnetic regenerator 1B, and the magnet 3A.

[0121] In a cross section orthogonal to the central axis CA of each of the first magnetic regenerator 1A and the second magnetic regenerator 1B, the first magnetic yoke 7A and the second magnetic yoke 7B are connected to each other in a ring shape. The third facing portion 71 of the first magnetic yoke 7A is connected to the third facing portion 71 of the second magnetic yoke 7B. The fourth facing portion 72 of the first magnetic yoke 7A is connected to the fourth facing portion 72 of the second magnetic yoke 7B.

[0122] The distance between each of the third facing portion 71 and the fourth facing portion 72 of the first magnetic yoke 7A and the first magnetic regenerator 1A is set so that the magnetic resistance of the magnetic path passing through the magnet 3A, the first magnetic regenerator 1A, and the first magnetic yoke 7A is larger than the magnetic resistance of the first magnetic path MC1 that should be formed within the magnet 3A and the first magnetic regenerator 1A in a third state in which the magnetic permeability of the magnetocaloric material 2 housed in the first magnetic regenerator 1A is not reduced. As a result, as shown in FIG. 6, the first magnetic path MC1 is formed within the first magnetic regenerator 1A in the third state in which the magnetic permeability of the magnetocaloric material 2 housed in the first magnetic regenerator 1A is not reduced. Figure 16

[0123] The distance between each of the third facing portion 71 and the fourth facing portion 72 of the second magnetic yoke 7B and the second magnetic regenerator 1B is set so that the magnetic resistance of the magnetic path passing through the magnet 3A, the second magnetic regenerator 1B, and the second magnetic yoke 7B is larger than the magnetic resistance of the first magnetic path MC1 that should be formed within the magnet 3A and the second magnetic regenerator 1B in a fourth state in which the magnetic permeability of the magnetocaloric material 2 housed in the second magnetic regenerator 1B is not reduced. The first magnetic path MC1 is formed within the second magnetic regenerator 1B in the fourth state in which the magnetic permeability of the magnetocaloric material 2 housed in the second magnetic regenerator 1B is not reduced.

[0124] The thickness of each of the first magnetic yoke 7A and the second magnetic yoke 7B can be set from the same viewpoint as the thickness of the magnetic yoke 7 of the magnetic refrigeration device 104. The thickness of the first magnetic yoke 7A is, for example, the same as the thickness of the second magnetic yoke 7B. Note that the thickness of the first magnetic yoke 7A can also be different from the thickness of the second magnetic yoke 7B.

[0125] In the magnetic refrigeration device 106, the material constituting the magnetocaloric material 2 housed in each of the first magnetic regenerator 1A and the second magnetic regenerator 1B can also be a material whose magnetic permeability easily changes due to temperature changes and aging over time, and the like. ​

[0126] Figure 17 indicates that a third magnetic path MC3 is formed in the third state in the case where the magnetic permeability of the Figure 16 magnetic material 2 housed in the first magnetic regenerator 1A decreases in the magnetic refrigeration device 106. In the magnetic refrigeration device 106, when the magnetic permeability of the magnetic material 2 housed in the first magnetic regenerator 1A decreases and the magnetic resistance of the first magnetic path MC1 increases, the magnetic resistance of the third magnetic path MC3 passing through the magnet 3A, the first facing portion 11 of the first magnetic regenerator 1A, a portion of the magnetic material 2 inside the first magnetic regenerator 1A, the first yoke 7A, and the second facing portion 12 of the first magnetic regenerator 1A is smaller than the magnetic resistance of the first magnetic path MC1. As a result, as shown in Figure 17 indicates, in the magnetic refrigeration device 106, the third magnetic path MC3 can be formed.

[0127] Likewise, in the case where the magnetic permeability of the magnetic material 2 housed in the second magnetic regenerator 1B decreases, in the magnetic refrigeration device 106, the magnetic resistance of the third magnetic path MC3 passing through the magnet 3A, the first facing portion 11 of the second magnetic regenerator 1B, a portion of the magnetic material 2 inside the second magnetic regenerator 1B, the second yoke 7B, and the second facing portion 12 of the second magnetic regenerator 1B is also smaller than the magnetic resistance of the first magnetic path MC1.

[0128] As a result, in the magnetic refrigeration device 106, even in the case where the magnetic permeability of the magnetic material 2 in at least either one of the first magnetic regenerator 1A and the second magnetic regenerator 1B decreases, magnetic leakage to the outside of the magnetic refrigeration device 106 can be prevented.

[0129] In addition, in the magnetic refrigeration device 106, since the first yoke 7A and the second yoke 7B are arranged so as to surround the entire magnet 3A, the first magnetic regenerator 1A, and the second magnetic regenerator 1B, the first yoke 7A and the second yoke 7B can magnetically shield between the inside and the outside thereof. For example, in the case where the first magnetic regenerator 1A and the second magnetic regenerator 1B are arranged at intervals from each other in the direction B, when the magnet 3A reciprocates between the respective recesses 10 of the first magnetic regenerator 1A and the second magnetic regenerator 1B, at least a portion of the magnet 3A is exposed from between the first magnetic regenerator 1A and the second magnetic regenerator 1B. In this case, even if the magnetic permeability of the magnetic material 2 does not decrease, the magnetism of the magnet 3A leaks to the outside of the first magnetic regenerator 1A and the second magnetic regenerator 1B. In the magnetic refrigeration device 106, the first yoke 7A and the second yoke 7B prevent the magnetic leakage to the outside of the first magnetic regenerator 1A and the second magnetic regenerator 1B from leaking to the outside of the magnetic refrigeration device 106.

[0130] At least one of the first magnetic thermal container 1A and the second magnetic thermal container 1B of the magnetic refrigeration device 106 may have the same structure as the magnetic thermal container 1 of the magnetic refrigeration device 102 , the magnetic refrigeration device 103 , or the magnetic refrigeration device 104 .

[0131] Implementation method 7.

[0132] like Figure 18 、 Figure 19 as well as Figure 20 As shown, the magnetic refrigeration device 107 of the seventh embodiment has the same structure and effects as the magnetic refrigeration device 106 of the sixth embodiment, and operates in the same manner as the magnetic refrigeration device 106 unless otherwise specified.

[0133] like Figures 18-20 As shown, the first yoke 7A of the magnetic refrigeration device 107 includes: a plurality of protrusions 81 that protrude toward the recess 10 of the first magnetic thermal container 1A and are spaced apart from each other along the central axis CA; and a plurality of coils 82 wound around each of the protrusions 81. Each of the protrusions 81 is made of a ferromagnetic material. The protrusions 81 are each integrally formed with, for example, the main body of the first yoke 7A. The combination of the protrusions 81 and the coils 82 constitutes a detector 8A that detects changes in the magnetic field passing through the protrusions 81.

[0134] Similarly, the second yoke 7B includes a plurality of protrusions 81 that protrude toward the recess 10 of the second magnetic thermal container 1B and are spaced apart from each other in the direction along the central axis CA; and a plurality of coils 82 wound around each of the protrusions 81. The protrusions 81 and coils 82 of the second yoke 7B have the same structure as the protrusions 81 and coils 82 of the first yoke 7A. The set of protrusions 81 and coils 82 constitutes a detector 8B that detects changes in the magnetic field passing through the protrusions 81.

[0135] like Figure 19 As shown, the plurality of protrusions 81 and the plurality of coils 82 are arranged, for example, spaced apart from each other in a direction A along the central axis CA. The magnetic refrigeration device 107 further includes a measuring unit 9 for measuring the induced electromotive force of the coils 82. The induced electromotive force of the coils 82 changes as the magnet 3A reciprocates in a direction B. The amount of change increases as the magnetic permeability of the magnetocaloric material 2 decreases.

[0136] Specifically, if Figure 18 As shown, when the magnetic permeability of the magnetocaloric material 2 housed in the first magnetocaloric container 1A is not reduced, the magnetism of the magnet 3A passing through the first magnetic yoke 7A is small. Therefore, the induced electromotive force generated in the coil 82 accompanying the movement of the magnet 3A is small, and a relatively small voltage is measured in the measuring unit 9.

[0137] On the other hand, Figure 20 As shown, when the magnetic permeability of the magnetocaloric material 2 decreases, the magnetism of the magnet 3A passing through the first magnetic yoke 7A increases. Therefore, the induced electromotive force generated in the coil 82 as the magnet 3A moves becomes larger than the induced electromotive force when the magnetic permeability of the magnetocaloric material 2 does not decrease. Consequently, the voltage measured by the measuring unit 9 becomes larger than the voltage when the magnetic permeability of the magnetocaloric material 2 does not decrease. As a result, by observing the change in the voltage measured by the measuring unit 9, it is possible to confirm that the magnetic field change is being appropriately applied to the magnetocaloric material 2 housed in the first magnetocaloric container 1A or the second magnetocaloric container 1B. Furthermore, by observing the change in the voltage measured by the measuring unit 9, it is possible to estimate the change in the magnetic permeability of the magnetocaloric material 2, thereby monitoring the extent of the magnetocaloric effect of the magnetocaloric material 2 and, based on the estimated extent of the magnetocaloric effect, the temperature of the magnetocaloric material 2 or the deterioration of the magnetocaloric material 2.

[0138] It should be noted that in the magnetic refrigeration device 107, at least one of the first magnetic yoke 7A and the second magnetic yoke 7B only needs to include at least one protrusion 81 and at least one coil 82. For example, a set of protrusions 81 and coils 82 may be arranged only around the area of ​​the magnetic refrigeration device 107 where the magnetic permeability of the magnetocaloric material 2 is most likely to decrease.

[0139] At least one of the first magnetic thermal container 1A and the second magnetic thermal container 1B of the magnetic refrigeration device 107 may have the same structure as the magnetic thermal container 1 of the magnetic refrigeration device 102 , the magnetic refrigeration device 103 , or the magnetic refrigeration device 104 .

[0140] Implementation method 8.

[0141] like Figure 21 As shown, the magnetic refrigeration device 108 of the eighth embodiment has the same structure and effects as the magnetic refrigeration device 107 of the seventh embodiment, and operates in the same manner as the magnetic refrigeration device 107 unless otherwise specified.

[0142] In the magnetic refrigeration device 108, adhesive 14 is filled inward of the first and second yokes 7A and 7B, except for the space 15 in which the magnets 3A move. When adhesive 14 is filled between the first and second magnetic thermal containers 1A and 1B and the first and second yokes 7A and 7B, a core (not shown) is inserted into the space 15 in which the magnets 3A move. This core is removed after the adhesive 14 cures. This creates the space 15.

[0143] The adhesive 14 is, for example, a curable resin or cement. Preferably, the thermal conductivity of the adhesive 14 is lower than that of the first magnetic thermal container 1A and the second magnetic thermal container 1B. This prevents heat generated by the magnetic thermal material 2 from dissipating to the outside of the first magnetic thermal container 1A or the second magnetic thermal container 1B.

[0144] In the magnetic refrigeration device 108, except for the moving space 15 for the magnet 3A, the adhesive 14 is filled between the first and second magnetic thermal containers 1A, 1B and the first and second magnetic yokes 7A, 7B. Therefore, the first and second magnetic thermal containers 1A, 1B are firmly positioned relative to the first and second magnetic yokes 7A, 7B.

[0145] When the magnet 3A is inserted into or removed from the recess 10 of the first or second magnetic thermal container 1A, 1B, a portion of the kinetic energy imparted to the magnet 3A is converted into electromagnetic energy in the form of a change in the magnetic field applied to the magnetic thermal material 2, generating a magnetic force between the magnet 3A and the magnetic thermal material 2. This magnetic force can cause a shift in the relative positions of the magnet 3A, the first and second magnetic thermal containers 1A, 1B, and the first and second yokes 7A, 7B, or even slight deformation of the first and second magnetic thermal containers 1A, 1B. This risk is particularly high over years of continuous use, as these magnetic forces are repeatedly applied to the magnet 3A and the magnetic thermal material 2. In contrast, in the magnetic refrigeration device 108, the first and second magnetic thermal containers 1A, 1B are secured to the first and second yokes 7A, 7B via adhesive 14, thereby mitigating this risk.

[0146] At least one of the first magnetic thermal container 1A and the second magnetic thermal container 1B of the magnetic refrigeration device 108 may have the same structure as the magnetic thermal container 1 of the magnetic refrigeration device 102 , the magnetic refrigeration device 103 , or the magnetic refrigeration device 104 .

[0147] Implementation method 9.

[0148] like Figure 22 as well as Figure 23 As shown, the magnetic refrigeration device 109 of the ninth embodiment has the same structure and effects as the magnetic refrigeration device 108 of the eighth embodiment, and operates in the same manner as the magnetic refrigeration device 108 unless otherwise specified.

[0149] like Figure 22 as well as Figure 23As shown, the magnetic refrigeration device 109 also has at least one bearing 16 disposed in the space 15. The bearing 16 guides the movement of the magnet 3A in the direction B. The bearing 16 is disposed between the outer circumferential surface of each of the first facing portions 11 of the first and second magnetic regenerator 1A and 1B and the N-pole surface of the magnet 3A, and between the outer circumferential surface of each of the second facing portions 12 of the first and second magnetic regenerator 1A and 1B and the S-pole surface of the magnet 3A. The axial direction of the bearing 16 is along the central axis CA.

[0150] The bearing 16 includes an outer ring 17, a retainer 18, and a plurality of rolling elements 19. The outer ring 17 is fitted in the space 15. The outer ring 17 is fitted between the recesses 10 of the first and second magnetic regenerator 1A and 1B. One end of the axial direction of the outer ring 17 is connected to the recess 10 of the first magnetic regenerator 1A, and the other end of the axial direction of the outer ring 17 is connected to the recess 10 of the second magnetic regenerator 1B. The retainer 18 is fitted on the inner side of the outer ring 17. The retainer 18 has pockets for holding the plurality of rolling elements 19. The plurality of rolling elements 19 are respectively held so as to be able to roll by the retainer 18. The plurality of rolling elements 19 are respectively arranged at intervals from each other, for example, in the axial direction and the circumferential direction of the bearing 16.

[0151] The plurality of rolling elements 19 are respectively able to contact the outer circumferential surface of the magnet 3A. The plurality of rolling elements 19 are respectively able to roll when the magnet 3A reciprocates in the direction B. The bearing 16 may, for example, also be a sliding bearing.

[0152] The magnetic refrigeration device 109 can also have a plurality of bearings 16 arranged at intervals from each other in the direction A. From a different viewpoint, Figure 23 The bearing 16 shown can also be divided into a plurality of pieces in the direction A.

[0153] It is preferable that the material constituting the bearing 16 be a non-magnetic body. It is preferable that a plurality of groove surfaces (rolling contact surfaces) that accommodate a portion of each of the plurality of rolling elements 19 be formed on the N-pole surface and the S-pole surface of the magnet 3A. The plurality of groove surfaces respectively extend in the direction B and are formed at intervals from each other in the direction A. In this way, it is possible to shorten the distance between the regions of the N-pole surface and the S-pole surface in which the groove surfaces are not formed and the magnetic regenerator material 2.

[0154] In the magnetic refrigeration device 109, along with the movement of the magnet 3A in the direction B, a magnetic force in the direction of the poles of the magnet 3A is also generated. On the other hand, in the magnetic refrigeration device 109, the bearing 16 is able to prevent the relative position of the magnet 3A with respect to the first and second magnetic regenerator 1A and 1B from changing, and is able to maintain the shortest distance (the perpendicular distance between surfaces) between the outer circumferential surface of each of the recesses 10 of the first and second magnetic regenerator 1A and 1B and the N-pole surface and the S-pole surface of the magnet 3A.

[0155] At least either one of the first magnetic regenerator 1A and the second magnetic regenerator 1B of the magnetic refrigeration device 109 can have the same structure as the magnetic regenerator 1 of the magnetic refrigeration device 102, the magnetic refrigeration device 103, or the magnetic refrigeration device 104.

[0156] Embodiment 10.

[0157] As shown in FIG. 10, the magnetic refrigeration device 110 of Embodiment 10 has the same structure and effects as the magnetic refrigeration device 109 of Embodiment 9, and operates similarly to the magnetic refrigeration device 109, unless otherwise specified. Figures 24-27

[0158] In the magnetic refrigeration device 110, the magnet 3A includes a plurality of magnet pieces divided in the moving direction B of the magnet 3A. An unillustrated driving section can move the plurality of magnet pieces stage by stage. The driving section can also be configured to be able to move the plurality of magnet pieces respectively stage by stage, and to be able to move the plurality of magnet pieces together at the same time. The number of magnet pieces included in the magnet 3A can be any number of two or more.

[0159] In the magnetic refrigeration device 110, by moving the plurality of magnet pieces respectively stage by stage, the change in the magnetic field applied to the first magnetic circuit MC1 and the magnetic regenerator material 2 housed in the second magnetic regenerator 1B can be caused stage by stage. In this case, the magnetization speed of the magnetic regenerator material 2 is reduced compared to the case where the plurality of magnet pieces are moved together at the same time, and thus the heat generation of the magnetic regenerator material 2 accompanying the magnetization and the heat absorption of the magnetic regenerator material 2 accompanying the demagnetization can be made to proceed slowly. As a result, in the magnetic refrigeration device 110, the difference between the magnetization speed of the magnetic regenerator material 2 and the heat exchange speed of the magnetic regenerator material 2 and the heat transport medium 4 can be reduced, and the temperature change of the magnetic regenerator material 2 caused in the case where the magnetization speed of the magnetic regenerator material 2 is faster than the heat exchange speed of the magnetic regenerator material 2 and the heat transport medium 4 can be suppressed.

[0160] Hereinafter, the operation of the magnetic refrigeration device 110 will be described with reference to FIGS. 11 to 14, taking the case where the magnet 3A is divided into three magnet pieces 3A1, 3A2, 3A3 as an example. Figures 24-27 In the magnetic refrigeration device 110, the magnet 3A includes a plurality of magnet pieces divided in the moving direction B of the magnet 3A. An unillustrated driving section can move the plurality of magnet pieces stage by stage. The driving section can also be configured to be able to move the plurality of magnet pieces respectively stage by stage, and to be able to move the plurality of magnet pieces together at the same time. The number of magnet pieces included in the magnet 3A can be any number of two or more.

[0161] Figure 24 A state in which all of the three magnet pieces 3A1, 3A2, 3A3 are disposed in the first position with respect to the recess 10 of the first magnetic regenerator 1A (hereinafter, referred to as a fifth state) is shown. In the fifth state, the three magnet pieces 3A1, 3A2, 3A3 are all housed in the recess 10 of the first magnetic regenerator 1A. Figure 24 In the fifth state shown in FIG. 11, all of the three magnet pieces 3A1, 3A2, 3A3 are housed in the recess 10 of the first magnetic regenerator 1A. At this time, the first magnetic circuit MC1A passing through the magnet 3A and the first magnetic regenerator 1A is formed.

[0162] ​from Figure 24 Starting from the fifth state shown, only one magnet piece 3A1 moves in the direction B and is accommodated in the recess 10 of the second magnetic thermal capacitor 1B, thereby achieving Figure 25 The state shown (hereinafter referred to as the sixth state).

[0163] exist Figure 25 In the sixth state shown, the two magnet pieces 3A2 and 3A3 are in the first position relative to the first magnetic thermal capacitor 1A, which is the third state, and the one magnet piece 3A1 is in the first position relative to the second magnetic thermal capacitor 1B and in the second position relative to the first magnetic thermal capacitor 1A, which is the fourth state. Consequently, a first magnetic circuit MC1B passing through the magnet pieces 3A2 and 3A3 and the first magnetic thermal capacitor 1A, and a first magnetic circuit MC1C passing through the magnet piece 3A1 and the second magnetic thermal capacitor 1B are simultaneously formed.

[0164] exist Figure 25 In the sixth state shown, Figure 24 Compared to the fifth state shown, the number of magnet pieces housed in the recess 10 of the first magnetic thermal container 1A decreases by one, while the number of magnet pieces housed in the recess 10 of the second magnetic thermal container 1B increases by one. Consequently, the magnetic thermal material 2 housed in the first magnetic thermal container 1A absorbs heat, while the magnetic thermal material 2 housed in the second magnetic thermal container 1B generates heat.

[0165] from Figure 25 Starting from the sixth state shown, only one magnet piece 3A2 moves in the direction B and is accommodated in the recess 10 of the second magnetic thermal capacitor 1B, thereby achieving Figure 26 The state shown (hereinafter referred to as the seventh state). Figure 25 The sixth state shown is Figure 26 The switching of the seventh state shown is preferably performed by Figure 24 The fifth state shown is Figure 25 The sixth state shown is switched after the heat generated by the magnetocaloric material 2 in the second magnetocaloric container 1B is transferred to the heat transfer medium 4 .

[0166] exist Figure 26 In the seventh state shown, the single magnet piece 3A3 is in the first position relative to the first magnetic thermal capacitor 1A, which is the third state, and the two magnet pieces 3A1 and 3A2 are in the first position relative to the second magnetic thermal capacitor 1B and in the second position relative to the first magnetic thermal capacitor 1A, which are the fourth state. Consequently, a first magnetic circuit MC1C passing through the magnet piece 3A3 and the first magnetic thermal capacitor 1A, and a first magnetic circuit MC1B passing through the magnet pieces 3A1, 3A2, and the second magnetic thermal capacitor 1B are simultaneously formed.

[0167] exist Figure 26 In the seventh state shown,Figure 25 Compared to the sixth state shown, the number of magnet pieces housed in the recess 10 of the first magnetic thermal container 1A decreases by one, while the number of magnet pieces housed in the recess 10 of the second magnetic thermal container 1B increases by one. Consequently, the magnetic thermal material 2 housed in the first magnetic thermal container 1A absorbs heat, while the magnetic thermal material 2 housed in the second magnetic thermal container 1B generates heat.

[0168] from Figure 26 Starting from the seventh state shown, only one magnet piece 3A3 moves in the direction B and is accommodated in the recess 10 of the second magnetic thermal container 1B, thereby achieving Figure 27 The state shown (hereinafter referred to as the eighth state). Figure 26 The seventh state shown is Figure 27 The eighth state shown is preferably switched by Figure 25 The sixth state shown is Figure 26 The seventh state shown is switched after the heat generated by the magnetocaloric material 2 in the second magnetocaloric container 1B is transferred to the heat transfer medium 4 .

[0169] exist Figure 27 In the eighth state shown, all three magnet pieces 3A1, 3A2, and 3A3 are in the fourth state where they are arranged at the first position relative to the recess 10 of the second magnetic thermal capacitor 1B. Figure 27 In the state shown, all three magnet pieces 3A1, 3A2, and 3A3 are housed in the recess 10 of the second magnetic thermal capacitor 1B. At this time, a first magnetic circuit MC1A is formed passing through the magnet 3A and the second magnetic thermal capacitor 1B.

[0170] During the above operation, the magnetocaloric material 2 housed in the second magnetocaloric container 1B is placed in a nearly adiabatic excitation process when switching from the fifth state to the sixth state, and in a nearly isothermal excitation process when switching from the sixth state to the seventh state and from the seventh state to the eighth state. Furthermore, in the eighth state, the three magnet pieces 3A1, 3A2, and 3A3 housed in the recess of the second magnetocaloric container 1B are gradually moved into the recess 10 of the first and second magnetocaloric containers 1B. This implements a thermal cycle consisting of an adiabatic excitation process, an isothermal excitation process, an adiabatic demagnetization process, and an isothermal demagnetization process for the magnetocaloric material 2 housed in the first and second magnetocaloric containers 1A, 1B, respectively.

[0171] Note that in the magnetic refrigeration device 110, only a part of the plurality of magnet pieces can be reciprocally moved in the direction B. In other words, a part of the plurality of magnet pieces can be kept in a relative position with respect to the first magnetic regenerator 1A or the second magnetic regenerator 1B. For example, in the magnetic refrigeration device 110, only the magnet pieces 3A1, 3A2 can be reciprocally moved with respect to the first magnetic regenerator 1A and the second magnetic regenerator 1B, respectively. In this case, instead of switching from the seventh state to the eighth state, switching from the seventh state to the sixth state is performed. In this way, the change amplitude of the magnetic field applied to the magnetic regenerative material 2 housed in the first magnetic regenerator 1A and the second magnetic regenerator 1B, respectively, can be changed in stages, and the output of the magnetic refrigeration device 110 can be adjusted in stages.

[0172] At least either one of the first magnetic regenerator 1A and the second magnetic regenerator 1B of the magnetic refrigeration device 110 can have the same structure as the magnetic regenerator 1 of the magnetic refrigeration device 102, the magnetic refrigeration device 103, or the magnetic refrigeration device 104.

[0173] Reference Signs

[0174] 1 magnetic regenerator, 1A first magnetic regenerator, 1B second magnetic regenerator, 2 magnetic regenerative material, 3 magnetic field generating device, 3A magnet, 3A1, 3A2, 3A3 magnet piece, 3B driving portion, 4 heat transport medium, 6 pump, 7 yoke, 7A first yoke, 7B second yoke, 8A, 8B detecting portion, 9 measuring portion, 10 recessed portion, 11 first facing portion, 12 second facing portion, 13, 73 connecting portion, 14 adhesive, 15 space, 16 bearing, 17 outer ring, 18 retainer, 19 rolling element, 20 plate-like member, 61 first pipe, 62 second pipe, 71 third facing portion, 72 fourth facing portion, 81 protruding portion, 82 coil, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110 magnetic refrigeration device.

Claims

1. A magnetic refrigeration apparatus, wherein, The magnetic refrigeration device includes: a magnetic heat material; a magnetic heat container that holds the magnetic heat material and is configured to form a flow path of a heat transport medium around the magnetic heat material; a magnetic field generating device that is capable of applying a magnetic field to the magnetic heat material housed inside the magnetic heat container and capable of varying the magnetic field, in a first state in which the magnetic field generating device applies the magnetic field to the magnetic heat material housed in the magnetic heat container, the magnetic field forms a first magnetic path through the magnetic heat material housed inside the magnetic heat container, the first magnetic path is different from a path through which the magnetic field passes when the magnetic field generating device applies the magnetic field to the magnetic heat container without housing the magnetic heat material.

2. The magnetic refrigeration device according to claim 1, wherein the magnetic heat container is a tubular member configured to flow the heat transport medium inside, the magnetic field generating device includes a magnet and a driving portion that varies the magnetic field by changing a relative position of the magnet with respect to the magnetic heat container between a first position and a second position, in the magnetic heat container, a recess is formed in a cross section orthogonal to a central axis of the magnetic heat container, the recess is recessed with respect to an outer peripheral surface of the magnetic heat container, and has a first facing portion and a second facing portion that face each other in a circumferential direction with respect to the central axis, when the magnet is disposed in the first position with respect to the magnetic heat container, the magnet is housed in the recess, an N pole of the magnet faces the first facing portion, and an S pole of the magnet faces the second facing portion, forming the first magnetic path through the magnet, the first facing portion, the magnetic heat material housed inside the magnetic heat container, and the second facing portion.

3. The magnetic refrigeration device according to claim 2, wherein in the cross section orthogonal to the central axis of the magnetic heat container, the magnetic heat container has a C shape, and the first facing portion and the second facing portion are both end portions of the C shape.

4. The magnetic refrigeration device according to claim 2 or 3, wherein the magnetic heat material constitutes a plurality of plate-like members that extend in a direction along the central axis inside the magnetic heat container, in the cross section orthogonal to the central axis of the magnetic heat container, one end of each of the plurality of plate-like members is connected to an inner peripheral surface of the first facing portion, the other end of each of the plurality of plate-like members is connected to an inner peripheral surface of the second facing portion, and the plurality of plate-like members are disposed at intervals from each other in a radial direction with respect to the central axis.

5. The magnetic refrigeration device according to any one of claims 2 to 4, wherein the magnetic heat container has a first inflow and outflow portion and a second inflow and outflow portion, the first inflow and outflow portion is provided at one end in a direction along the central axis and allows the heat transport medium to flow in or out, and the second inflow and outflow portion is provided at the other end in the direction along the central axis and allows the heat transport medium to flow out or in, ​ The magnetic refrigeration device further includes a pump configured to cause the heat transport medium to flow into or out of the first inflow / outflow portion and the second inflow / outflow portion, the recess extends between the first inflow / outflow portion and the second inflow / outflow portion in a direction along the central axis, when the magnet is disposed in the first position with respect to the first magnetic regenerator, the magnet extends between the first inflow / outflow portion and the second inflow / outflow portion in a direction along the central axis.

6. The magnetic refrigeration device according to any one of claims 2 to 5, wherein the magnetic refrigeration device further includes a magnetic yoke configured to surround the magnetic regenerators when viewed in a direction along the central axis, when the magnetic permeability of the magnetic regenerator material decreases and the magnetic resistance of the first magnetic circuit increases, the magnetic resistance of a magnetic circuit passing through the magnet, the first facing portion, the magnetic regenerator material housed inside the magnetic regenerator, the magnetic yoke, and the second facing portion is smaller than the magnetic resistance of the first magnetic circuit.

7. The magnetic refrigeration device according to any one of claims 2 to 5, wherein the magnetic refrigeration device includes a first magnetic regenerator and a second magnetic regenerator, the first magnetic regenerator and the second magnetic regenerator each constitute the magnetic regenerators, the first magnetic regenerator and the second magnetic regenerator are disposed such that the central axes of the first magnetic regenerator and the second magnetic regenerator extend in parallel to each other, and the recesses of the first magnetic regenerator and the second magnetic regenerator face each other, the drive portion is capable of switching between a third state and a fourth state, in the third state, the magnet is housed in the recess of the first magnetic regenerator, is disposed in the first position with respect to the first magnetic regenerator, and is disposed in the second position with respect to the second magnetic regenerator, in the fourth state, the magnet is housed in the recess of the second magnetic regenerator, is disposed in the first position with respect to the second magnetic regenerator, and is disposed in the second position with respect to the first magnetic regenerator.

8. The magnetic refrigeration device according to claim 7, wherein the magnetic refrigeration device further includes a magnetic yoke configured to surround the magnet, the first magnetic regenerator, and the second magnetic regenerator when viewed in a direction along the central axis, when the magnetic permeability of the magnetic regenerator material decreases and the magnetic resistance of the first magnetic circuit increases, the magnetic resistance of a magnetic circuit passing through the magnet, the first facing portion, the magnetic regenerator material housed inside the magnetic regenerator, the magnetic yoke, and the second facing portion is smaller than the magnetic resistance of the first magnetic circuit.

9. The magnetic refrigeration device according to claim 8, wherein the magnetic yoke includes protruding portions protruding toward the recesses and disposed at intervals from each other in a direction along the central axis, and coils wound around the protruding portions respectively, the magnetic refrigeration device further includes a measurement portion configured to measure an induced electromotive force of the coils due to a magnetic field variation of the first magnetic circuit.

10. The magnetic refrigeration device according to claim 8 or 9, wherein the magnetic yoke is configured in a ring shape so as to surround the entirety of the first magnetic heat container, the second magnetic heat container, and the magnet when viewed in a direction along the central axis, between the first magnetic heat container and the second magnetic heat container and the magnetic yoke, except for a space for movement of the magnet, an adhesive is filled.

11. The magnetic refrigeration device according to any one of claims 7 to 10, wherein the magnetic refrigeration device further comprises bearings configured between an outer circumferential surface of each of the first facing portion of the first magnetic heat container and the second magnetic heat container and an N-pole surface of the magnet and between an outer circumferential surface of each of the second facing portion of the first magnetic heat container and the second magnetic heat container and an S-pole surface of the magnet, an axial direction of each of the bearings is along the central axis.

12. The magnetic refrigeration device according to any one of claims 7 to 11, wherein the driving portion is configured to move the magnet with respect to the first magnetic heat container and the second magnetic heat container, the magnet includes a plurality of magnet pieces divided in a direction of movement of the magnet, the driving portion is capable of moving the plurality of magnet pieces in stages.

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