Magnetic refrigeration device

Abstract

A magnetic refrigeration device (101) is provided with: a magnetic heat material (2); a magnetic heat container (1) that holds the magnetic heat material and is arranged to form a flow path of a heat transport medium (4) around the magnetic heat material; and a magnetic field generating device (3) 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 a magnetic field to the magnetic heat material housed in the magnetic heat container, the magnetic field forms a first magnetic circuit (MC1) through the magnetic field generating device and the magnetic heat material housed inside the magnetic heat container. The first magnetic circuit 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 that does not house the magnetic heat material.

Description

Technical Field

[0001] This disclosure relates to magnetic refrigeration devices. Background Technology

[0002] A magnetic refrigeration device is a cooling and heating system that utilizes the magnetocaloric effect. For example, a magnetic refrigeration device is a heat pump system that uses a heat transfer medium to transfer heat and cold energy generated in a magnetocaloric material due to the magnetocaloric effect by applying a changing magnetic field to the magnetocaloric material filled in a magnetocaloric container to the outside of the container.

[0003] Japanese Patent Application Publication No. 2004-317040 (Patent Document 1) discloses an apparatus that forms a magnetic circuit through a magnetothermal container and a magnetic yoke, and changes the magnetic field applied to the magnetothermal container by a magnetic field generator composed of a permanent magnet and an electromagnet.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2004-317040 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the magnetic refrigeration device described in Patent Document 1, a large magnetic yoke is required in the magnetic circuit, which makes it difficult to achieve lightweight design.

[0009] The main objective of this application is to provide a magnetic refrigeration device that is lighter than conventional magnetic refrigeration devices.

[0010] Methods for solving problems

[0011] The magnetic refrigeration device disclosed herein includes: a magnetocaloric material; a magnetocaloric container holding the magnetocaloric material and configured to form a flow path for a heat transfer medium around the magnetocaloric material; and a magnetic field generating device 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 where 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 path through the magnetocaloric material housed inside the magnetocaloric container. This first magnetic path differs from the path taken by the magnetic field when the magnetic field generating device applies a magnetic field to a magnetocaloric container that does not house the magnetocaloric material.

[0012] The effects of the invention

[0013] According to this disclosure, a magnetic refrigeration device that is lighter than conventional magnetic refrigeration devices can be provided. Attached Figure Description

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

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

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

[0017] Figure 4 This is a cross-sectional view of a modified example of the magnetic refrigeration device according to Embodiment 1.

[0018] Figure 5 This is a cross-sectional view showing the state in which the magnet is arranged in a first position relative to the magnetothermal container that does not contain magnetothermal material in the magnetic refrigeration device of Embodiment 1.

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

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

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

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

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

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

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

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

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

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

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

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

[0031] Figure 18This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 7.

[0032] Figure 19 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 7.

[0033] Figure 20 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 7.

[0034] Figure 21 This is a cross-sectional view of the magnetic refrigeration device according to embodiment 8.

[0035] Figure 22 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 9.

[0036] Figure 23 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 9.

[0037] Figure 24 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 10.

[0038] Figure 25 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 10.

[0039] Figure 26 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 10.

[0040] Figure 27 This is a cross-sectional view of the magnetic refrigeration device according to Embodiment 10. Detailed Implementation

[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 equivalent parts are labeled with the same reference numerals, and their descriptions will not be repeated.

[0042] Implementation method 1.

[0043] like Figures 1-3 As shown, the magnetic refrigeration device 101 of Embodiment 1 mainly includes a magnetothermal container 1, a magnetothermal material 2, a magnetic field generating device 3, and a heat transfer medium 4. The magnetic field generating device 3 includes a magnet 3A and a driving unit 3B. The magnetic refrigeration device 101 does not have a magnetic yoke.

[0044] It should be noted that, Figure 1 as well as Figure 2 This indicates a first state in which the magnet 3A of the magnetic refrigeration device 101 of Embodiment 1 is located in a first position relative to the magnetothermal container 1. Figure 3 This indicates the second state in which the magnet 3A of the magnetic refrigeration device 101 of Embodiment 1 is located in a second position relative to the magnetothermal container 1. Figure 1 as well as Figure 3 It is a cross-sectional view orthogonal to the central axis CA of the magnetothermal container 1. Figure 2 This is a cross-sectional view of the magnetic refrigeration device 101, orthogonal to the radial direction (hereinafter referred to as radial) relative to the central axis CA of the magnetothermal container 1. Figure 2 In the diagram, the drive unit 3B is omitted.

[0045] like Figure 1 As shown, the magnetothermal container 1 holds the magnetothermal material 2 inside. The magnetothermal container 1 is configured to form a flow path for the heat transfer medium 4 around the magnetothermal material 2. The magnetothermal container 1 is, for example, a tubular component. The magnetothermal container 1 is, for example, a circular tubular component. It should be noted that the magnetothermal container 1 can also be a square tubular component. From the viewpoint of preventing the heat generated in the magnetothermal material 2 from diffusing to the outside of the magnetothermal container 1, the magnetothermal container 1 is preferably made of a material with a lower thermal conductivity than the heat transfer medium 4 (high thermal insulation).

[0046] like Figure 1 As shown, in the magnetothermal container 1, a recess 10 is formed on a cross section orthogonal to the central axis CA of the magnetothermal container 1, recessed relative to the outer peripheral surface of the magnetothermal container 1. The recess 10 has a first opposing portion 11 and a second opposing portion 12 that face each other in the circumferential direction (hereinafter referred to as the circumferential direction) relative to the central axis CA. The recess 10 also has a connecting portion 13 that connects the first opposing portion 11 and the second opposing portion 12. The connecting portion 13 extends, for example, in a direction orthogonal to the aforementioned radial direction. The connecting portion 13 is, for example, disposed on the central axis CA.

[0047] The magnetocaloric material 2 is composed of a magnetic body capable of producing a magnetocaloric effect. Any material capable of producing a magnetocaloric effect can constitute the magnetocaloric material 2. For example, when a high magnetocaloric effect is required, it is preferable to select a material with high magnetic permeability to constitute the magnetocaloric material 2. Examples of materials constituting such a magnetocaloric material 2 include alloys containing gadolinium (Gd) or alloys containing lanthanum (La).

[0048] The shape of the magnetothermal material 2 can be arbitrarily chosen, for example, it can be granular. Preferably, the magnetothermal material 2 is spherical. The magnetothermal material 2 is filled and fixed inside the magnetothermal container 1. Inside the magnetothermal container 1, a gap is formed around the magnetothermal material 2, allowing the heat transfer medium 4 to flow.

[0049] From the viewpoint of minimizing the magnetoresistance of the first magnetic circuit MC1 (described later) formed in the first state, the magnetocaloric material 2 is preferably densely packed inside the magnetocaloric container 1. When the magnetocaloric material 2 is granular, from the viewpoint of minimizing the number of times it passes through the gaps between particles to reduce the aforementioned magnetoresistance, the particle size (equivalent circle diameter) of the magnetocaloric material 2 is preferably 100 μm or more. On the other hand, from the viewpoint of efficiently transferring the heat 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 magnetothermal material 2 housed inside the magnetothermal container 1, and of varying the 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 inside the magnetothermal container 1. The drive unit 3B, for example, causes the magnet 3A to reciprocate along direction B. Direction B is a direction orthogonal to the central axis CA, extending from 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 cause the magnetothermal container 1 to reciprocate relative to the magnet 3A.

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

[0052] like Figure 1As shown, in the first state, a magnet 3A, located at a first position relative to the magnetothermal container 1, is housed in the recess 10, and a magnetic field is applied to the magnetothermal material 2 housed in the magnetothermal container 1. In the first state, the N pole of the magnet 3A faces the first opposing portion 11 in the circumferential direction, and the S pole of the magnet 3A faces the second opposing portion 12 in the circumferential direction. In the first state, the side surface of the magnet 3A along the magnetization direction faces the connecting portion 13 of the recess 10 in the radial direction. In the first state, the N pole of the magnet 3A can be connected to the first opposing portion 11, the S pole of the magnet 3A can be connected to the second opposing portion 12, and the side surface of the magnet 3A can be connected to the connecting portion 13. The surface area of ​​the N pole of the magnet 3A is, for example, equal to the outer surface area of ​​the first opposing portion 11 facing into the recess 10. The surface area of ​​the S pole of the magnet 3A is, for example, equal to the outer surface area of ​​the second opposing portion 12 facing into the recess 10. If the recess 10 of the magnetothermal container 1, which is a cylindrical component, and the magnet 3A are configured in such a way, the magnetothermal material 2 filled in the magnetothermal container 1 can be given a more uniform strength of magnetism, thereby improving the utilization efficiency of the magnetothermal material 2.

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

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

[0055] like Figure 2 As shown, the magnetothermal container 1 also has a first inflow / outflow portion OP1 and a second inflow / outflow portion OP2. The first inflow / outflow portion OP1 is located at one end of the aforementioned axial direction of the magnetothermal container 1. The second inflow / outflow portion OP2 is located at the other end of the aforementioned axial direction of the magnetothermal container 1. The heat transfer medium flows from the first inflow / outflow portion OP1 into the interior of the magnetothermal container 1, and within the interior of the magnetothermal container 1, along... Figure 2 The heat transfer medium 4 flows in the direction of arrow F and exits from the second inlet / outlet OP2 to the outside of the magnetothermal container 1. Alternatively, the heat transfer medium 4 flows into the interior of the magnetothermal container 1 from the second inlet / outlet OP2, flows in the opposite direction to arrow F inside the magnetothermal container 1, and exits from the first inlet / outlet OP1 to the outside of the magnetothermal container 1.

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

[0057] like Figure 3 As shown, in the second state, the magnet 3A, located at a second position relative to the magnetothermal container 1, is disposed outside the recess 10. In the second state, the magnetic field applied to the magnetothermal material 2 in the first state is removed from the magnetothermal material 2. From a different perspective, in the second state, the magnet 3A, located at a second position relative to the magnetothermal container 1, does not apply a magnetic field to the magnetothermal material 2 housed in the magnetothermal container 1 to a degree sufficient to enable the magnetothermal material 2 to exert a magnetothermal 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 section OP1 or the second inflow / outflow section OP2, or for causing the heat transfer medium 4 to flow out from the first inflow / outflow section OP1 or the second inflow / outflow section OP2.

[0059] On the other hand, the magnetic refrigeration device 101 may also include a pump for causing the heat transfer medium 4 to flow into the first inflow / outflow section OP1 or the second inflow / outflow section OP2, or for causing the heat transfer medium 4 to flow out from the first inflow / outflow section OP1 or the second inflow / outflow section 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 inflow / outflow section OP1. For example, the magnetic refrigeration device 101 may also be configured to further include a first pipe 61 connected to the first inflow / outflow section OP1 and a second pipe 62 connected to the second inflow / outflow section OP2, with the pump 6 mounted on the first pipe 61. The pump 6... Figure 4 Arrow F indicates the direction in which the heat transfer medium 4 is conveyed within the first piping 61, the magnetothermal container 1, and the second piping 62. It should be noted that the first piping 61 is connected, for example, to a first heat exchanger (not shown). The second piping 62 is connected, for example, to a second heat exchanger (not shown).

[0061] Next, the operation of the magnetic cooling device 101 will be explained. As an initial state, let's consider the second state described above. In the second state, the magnetothermal material 2 and the heat transfer medium 4 are at the same temperature, and the magnet 3A is positioned in a second position relative to the magnetothermal container 1 to remove the magnetic field from the magnetothermal material 2.

[0062] First, magnet 3A moves from a second position to a first position relative to the magnetothermal container 1 via drive unit 3B, inserting itself from the outside of the recess 10 of the magnetothermal container 1 into the inside. This transitions from a second state where the magnetic field is removed from the magnetothermal material 2 housed in the magnetothermal container 1, to a first state where a magnetic field is applied to the magnetothermal material 2 housed in the magnetothermal container 1. During this transition, the magnetothermal material 2 heats up, and its temperature rises. The magnetothermal material 2 becomes hotter than the adjacent heat transfer medium 4, thus heat energy is transferred from the magnetothermal material 2 to the heat transfer medium 4, causing the temperature of the heat transfer medium 4 to rise. The heated heat transfer medium 4 is then pumped from the magnetothermal container 1 to the outside via pump 6, supplying it to external devices (e.g., a second heat exchanger). Simultaneously, new heat transfer medium 4 flows into the magnetothermal container 1. The magnetothermal material 2 also transfers heat energy to the newly flowing heat transfer medium 4. The heated heat transfer medium 4 is then pumped from the magnetothermal container 1 to the outside via pump 6. Through the above process, the temperature of the magnetothermal material 2 is eventually reduced to the temperature of the heat transfer medium 4 that flows into the interior of the magnetothermal container 1.

[0063] Next, magnet 3A is moved from a first position to a second position relative to the magnetothermal container 1 via drive unit 3B, and removed from the interior of the recess 10 of the magnetothermal container 1 to the outside. This transitions from a first state of applying a magnetic field to the magnetothermal material 2 housed in the magnetothermal container 1 to a second state of removing the magnetic field from the magnetothermal material 2 housed in the magnetothermal container 1. During this transition, the magnetothermal material 2 absorbs heat, and its temperature decreases. The magnetothermal material 2 becomes colder than the adjacent heat transfer medium 4, therefore, it absorbs heat from the heat transfer medium 4, and the temperature of the heat transfer medium 4 decreases. The cooled heat transfer medium 4 is then pumped from the magnetothermal container 1 to the outside via pump 6, thereby supplying it to external devices (e.g., a first heat exchanger) of the magnetothermal container 1. Simultaneously, new heat transfer medium 4 flows into the magnetothermal container 1. The magnetothermal material 2 also absorbs heat from the newly flowing heat transfer medium 4. The cooled heat transfer medium 4 is then pumped from the magnetothermal container 1 to the outside via pump 6. Through the above process, the temperature of the magnetothermal material 2 eventually rises to the temperature of the heat transfer medium 4 that flows into the interior of the magnetothermal container 1.

[0064] By repeating the above process, the magnetic refrigeration device 101 can alternately extract high-temperature heat transfer medium 4 and low-temperature heat transfer medium 4 from the magnetothermal container 1. Therefore, the magnetic refrigeration device 101 functions as a heat pump.

[0065] When switching between the first and second states, the direction in which pump 6 delivers the heat transfer medium 4 may not change. In the first state, the direction in which pump 6 delivers the heat transfer medium 4 may also be the same as in the second state.

[0066] On the other hand, the direction in which pump 6 delivers the heat transfer medium 4 can also be switched when switching between the first and second states. In the second state, the direction in which pump 6 delivers the heat transfer medium 4 can also be opposite to the direction in the first state. This allows one side of the magnetothermal container 1 to be at a high temperature and the other side at a low temperature. For example, the first heat exchanger connected to the first inflow / outflow section OP1 via the first piping 61 can be used as the heat exchanger on the low-temperature side, and the second heat exchanger connected to the second inflow / outflow section OP2 via the second piping 62 can be used as the heat exchanger on the high-temperature side. In this case, the excitation process of the magnetothermal material 2 and the demagnetization process of the magnetothermal material 2 are repeated alternately and continuously, and the magnetothermal material 2 acts as a heat storage agent, creating a temperature difference greater than the temperature change obtained in this cycle between one side and the other side of the magnetothermal container 1.

[0067] The state of the heat transfer medium 4 during the above-described operation can be liquid, gas, or a gas-liquid mixture. When the heat transfer medium 4 is in a gas-liquid mixture state, the liquid heat transfer medium 4 can gain heat from the magnetocaloric material 2 and change phase to gas. In this case, since the latent heat accompanying the gas-liquid phase change of the heat transfer medium 4 can be transferred, compared to using a heat transfer medium 4 that does not undergo a phase change during the above-described operation, the temperature rise of the heat transfer medium 4 can be suppressed, and the heat transfer rate per unit mass of the heat transfer medium 4 can be increased.

[0068] Next, the effect of the magnetic cooling device 101 will be explained.

[0069] Figure 5 This indicates that the magnet 3A is positioned in a first position relative to the magnetothermal container 1, which does not contain the magnetothermal material 2. In other words, Figure 5 The magnetic thermal container 1 shown is Figure 1 The only difference in the magnetic thermal container 1 shown is that it does not contain magnetic thermal material 2 inside. Figure 5 As shown, magnet 3A can also be configured such that when magnet 3A is housed in the recess 10 of the magnetothermal container 1 that does not house the magnetothermal material 2, a magnetic field leaks out to the outside of the magnetothermal container 1. Even with magnet 3A configured in this way, the magnetic cooling device 101 can achieve the following: Figure 1 The first magnetic circuit is formed in the first state as shown. This is because, in the magnetic cooling device 101, in the first state, the magnetic permeability of the magnetocaloric material 2 housed in the magnetocaloric container 1 can be used to make the magnetism of the magnet 3A spread throughout the magnetocaloric material 2 housed in the magnetocaloric container 1.

[0070] Specifically, a recess 10 is formed in the magnetothermal 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 opposing portion 11, and the S pole of the magnet 3A faces the second opposing portion 12. Thus, the path of the magnetic field applied to the magnetothermal material 2 by the magnet 3A can be formed to pass through the entire magnetothermal material 2 housed in the magnetothermal container 1.

[0071] As a result, in the magnetic refrigeration device 101, the magnetic yoke, which is necessary in conventional magnetic refrigeration devices to form a path for the magnetic field applied by the magnet to the magnetothermal material, is not required, and a lighter weight can be achieved compared to conventional magnetic refrigeration devices.

[0072] <Variation Example>

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

[0074] A coating layer (not shown) may also be formed on the surface of the magnetocaloric material 2. This coating layer is configured to suppress corrosion of the magnetocaloric material 2 due to contact with the heat transfer medium 4. The material constituting the coating layer can be any material capable of suppressing such corrosion, including resin and metal materials. Furthermore, the heat transfer medium 4 may contain a corrosion inhibitor to suppress the corrosion. When a coating layer made of resin is formed on the surface of the magnetocaloric material 2, the electrical conductivity between the particles of the magnetocaloric material 2 decreases, thereby reducing eddy current losses generated in the magnetocaloric material 2 due to changes in the magnetic field.

[0075] The material constituting the magnetocaloric material 2 can also be a material whose magnetic permeability decreases when the magnetocaloric effect of the magnetocaloric material 2 is reduced. When the magnetic permeability of the magnetocaloric material 2 is low, even in the first state described above, a strong magnetic circuit will not form inside the magnetocaloric container 1 containing the magnetocaloric material 2; therefore, a strong magnetic field will not be applied to the magnetocaloric material 2. From the viewpoint of suppressing power loss caused by eddy currents generated in the magnetocaloric material 2 when a magnetic field is applied in the first state, this structure is preferred when the magnetocaloric effect generated by the magnetocaloric material 2 is small.

[0076] Magnet 3A is not limited to a permanent magnet. Magnet 3A can have any structure, as long as it can impart a change in the magnetic field to the magnetocaloric material 2; for example, it can be an electromagnet, or more specifically, a superconducting magnet. If magnet 3A is an electromagnet, it can also be fixed to the recess 10. The magnetic cooling device 101 may also omit the drive unit 3B. Even so, the magnetic field applied to the magnetocaloric material 2 housed in the magnetocaloric container 1 can be varied by adjusting the amount of current flowing in the coil.

[0077] Implementation method 2.

[0078] like Figures 6-8As shown, unless otherwise specified, the magnetic refrigeration device 102 of Embodiment 2 has the same structure and effect as the magnetic refrigeration device 101 of Embodiment 1, and operates in the same manner as the magnetic refrigeration device 101.

[0079] It should be noted that, Figure 6 as well as Figure 7 This indicates a first state in which the magnet 3A of the magnetic refrigeration device 102 of Embodiment 2 is located in a first position relative to the magnetothermal container 1. Figure 8 This indicates the second state in which the magnet 3A of the magnetic refrigeration device 102 is in a second position relative to the magnetothermal container 1. Figure 6 as well as Figure 8 It is a cross-sectional view orthogonal to the central axis CA of the magnetothermal container 1. Figure 7 This is a cross-sectional view of the magnetic refrigeration device 102, orthogonal to the radial direction of the magnetothermal container 1. Figures 6-8 In the diagram, the drive unit 3B is omitted.

[0080] In the magnetic cooling device 102 of Embodiment 2, the magnetic heat container 1 has a C-shape in a cross-section orthogonal to the central axis CA of the magnetic heat container 1. The recess 10 of the magnetic heat container 1 forms a gap between the two ends of the C-shape. The recess 10 is recessed towards the central axis CA from the outer peripheral surface of the magnetic heat container 1. The first opposing portion 11 and the second opposing portion of the recess 10 of the magnetic heat container 1 constitute the two ends of the C-shape. In a cross-section orthogonal to the central axis CA, the inner ends of the first opposing portion 11 and the second opposing portion 12 are connected to each other via an inner portion extending circumferentially in a portion further inward than the internal space of the magnetic heat container 1. In a cross-section orthogonal to the central axis CA, the outer ends of the first opposing portion 11 and the second opposing portion 12 are connected to each other via an outer portion extending circumferentially inward relative to the internal space of the magnetic heat container 1.

[0081] like Figure 6 As shown, in the magnetic refrigeration device 102, when the magnet 3A is positioned relative to the magnetothermal container 1 in a first position, the magnet 3A and the magnetothermal container 1 are arranged in a ring shape on a cross section orthogonal to the central axis CA. In such a magnetic refrigeration device 102, a longer first magnetic circuit MC1 can be formed compared to the magnetic refrigeration device 101. As a result, when comparing the magnetic refrigeration devices 102 and 101, which have the same cross-sectional area of ​​the first magnetic circuit MC1, the amount of magnetothermal material 2 that can be contained in the magnetothermal container 1 of the magnetic refrigeration device 102 can be greater than the amount of magnetothermal material 2 that can be contained in the magnetothermal container 1 of the magnetic refrigeration device 101.

[0082] like Figure 6As shown, the magnet 3A and the magnetothermal container 1 can also be arranged in a square ring shape on a section orthogonal to the central axis CA. It should be noted that the magnet 3A and the magnetothermal container 1 can also be arranged in a circular ring shape on a section orthogonal to the central axis CA.

[0083] In a cross section orthogonal to the central axis CA, the first opposing portion 11 and the second opposing portion 12 are connected, for example, by the shortest distance between the inner and outer portions of the magnetothermal container 1. In the cross section orthogonal to the central axis CA, the width of each surface of the N and S poles of the magnet 3A is, for example, equal to the length of the first opposing portion 11 and the second opposing portion 12, and the shortest distance between the inner and outer portions of the magnetothermal container 1. Thus, regardless of its position within the magnetothermal container 1, a magnetic field of uniform intensity can be applied to the magnetothermal material 2.

[0084] like Figure 6 As shown, in the first state, a space is formed inside the magnetothermal container 1 and the magnet 3A. This space extends axially. Figure 8 As shown, in the second state, magnet 3A moves away from the aforementioned space, thus the aforementioned space is also maintained in the second state. The purpose of the aforementioned space can be arbitrarily chosen. For example, the drive unit of the magnetic field generating device 3 can also be housed in the aforementioned space. As another example, components for improving the strength of the magnetothermal container 1, such as resin material or cement, can also be filled in the aforementioned space. As yet another example, piping for the flow of the heat transfer medium can also be housed in the aforementioned space as a return path for the heat transfer medium flowing out of the magnetothermal container 1.

[0085] The magnetic cooling device 102 can also be modified in the same way as the magnetic cooling device 101. In the magnetic cooling device 102, the magnet 3A can also be an electromagnet. In this case, the coil containing the magnet 3A can be wound around a portion of the circumference of the annular magnetic heating container 1 without forming the recess 10. The first magnetic circuit can also be formed in this way.

[0086] Implementation method 3.

[0087] like Figures 9-11 As shown, unless otherwise specified, the magnetic refrigeration device 103 of Embodiment 3 has the same structure and effect as the magnetic refrigeration device 101 of Embodiment 1, and operates in the same manner as the magnetic refrigeration device 101.

[0088] It should be noted that, Figure 9 as well as Figure 10 This indicates a first state in which the magnet 3A of the magnetic refrigeration device 103 of Embodiment 3 is located in a first position relative to the magnetothermal container 1. Figure 11This indicates the second state in which the magnet 3A of the magnetic refrigeration device 103 is in a second position relative to the magnetothermal container 1. Figure 9 as well as Figure 11 It is a cross-sectional view orthogonal to the central axis CA of the magnetothermal container 1. Figure 10 This is a cross-sectional view orthogonal to the radial direction of the magnetothermal container 1. Figures 9-11 In the diagram, the drive unit 3B is omitted.

[0089] In the magnetic refrigeration device 103 of embodiment 3, the magnetic thermal material 2 is formed inside the magnetic thermal container 1 as a plurality of plate-shaped components 20 extending in the direction along the central axis.

[0090] In a cross-section orthogonal to the central axis of the magnetothermal container 1, one end of each of the plurality of plate-shaped components 20 is connected to the inner circumferential surface of the first opposing portion 11. In the same cross-section, the other end of each of the plurality of plate-shaped components 20 is connected to the inner circumferential surface of the second opposing portion 12. In this cross-section, the plurality of plate-shaped components 20 are arranged radially spaced apart from each other relative to the central axis CA. The gaps formed between adjacent plate-shaped components 20 constitute the flow path of the heat transfer medium 4. Figure 10 As shown, the gap formed between two adjacent plate-shaped components 20 is connected to the first inflow / outflow section OP1 and the second inflow / outflow section OP2.

[0091] From different perspectives, multiple slits are formed in the magnetocaloric material 2 of the magnetic refrigeration device 103. Each slit constitutes a flow path for the heat transfer medium 4.

[0092] In the magnetic refrigeration device 103, if the magnetic permeability of the magnetocaloric material 2 is higher than that of the heat transfer medium 4, the magnetism of the magnet 3A can be concentrated on the magnetocaloric material 2. Therefore, in the magnetic refrigeration device 103, the first magnetic circuit MC1 can be formed such that it does not pass through the flow path of the heat transfer medium 4, but only through the magnet 3A, the first opposing portion 11, the magnetocaloric material 2, and the second opposing 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 two adjacent plate-shaped 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 magnetocaloric material 2 in the magnetic refrigeration device 101. In this case, the pressure loss of the heat transfer medium 4 flowing in a space formed between two adjacent plate-shaped components 20 in the magnetic refrigeration device 103 can be less than the pressure loss of the heat transfer medium 4 flowing in a space formed between the particles of the magnetothermal material 2 in the magnetic refrigeration device 101.

[0093] The thickness of each of the multiple plate-shaped components 20 affects the heat transfer characteristics (heat removal efficiency) between the magnetothermal material 2 and the heat transfer medium 4. The thickness of each of the multiple plate-shaped components 20 is, for example, 0.5 mm or more and 5.0 mm or less. The width of the space formed between two adjacent plate-shaped components 20 (the interval between two adjacent plate-shaped components 20) affects the pressure loss of the heat transfer medium 4 flowing in that space, as well as the heat transfer characteristics (heat removal efficiency) between the magnetothermal material 2 and the heat transfer medium 4. If the width of the space is too narrow, the pressure loss increases, and the heat removal efficiency decreases. If the width of the space is too wide, the volume of the magnetothermal material 2 housed in the magnetothermal container 1 becomes smaller, and therefore, the volume utilization rate of the magnetothermal container 1 becomes lower. The interval between two adjacent plate-shaped components 20 can be set based on a comparison with the thickness of the plate-shaped components 20, for example, set to 0.5 mm or more and 5.0 mm or less. Since the permeability of each plate-shaped component 20 is greater than the permeability between two adjacent plate-shaped components 20, the magnetic flux applied by the magnet 3A is concentrated in each plate-shaped component 20. To increase the magnetic flux density of each plate-shaped component 20, for example, the spacing between two adjacent plate-shaped components 20 can be equal to the thickness of the plate-shaped component 20, so that the density of magnetic flux passing through each plate-shaped component 20 is about twice the magnetic flux density of the magnet 3A.

[0094] In the magnetic refrigeration device 103, the distance between two adjacent plate-shaped members 20 can be constant in at least either the circumferential or axial direction. Alternatively, the distance between two adjacent plate-shaped members 20 can be non-constant in both the circumferential and axial directions. As long as at least a portion of two adjacent plate-shaped members 20 is spaced apart from each other and forms a flow path for the heat transfer medium 4, portions of the two adjacent plate-shaped members 20 can also come into contact with each other.

[0095] In the magnetic cooling device 103, on a cross section orthogonal to the central axis CA, one end and the other end of a portion of the plate-shaped component 20 can also be connected to the connecting portion 13.

[0096] The magnetic refrigeration device 103 can also have the same structure as the magnetic refrigeration device 102, except that the magnetothermal material 2 forms multiple plate-shaped components 20.

[0097] Implementation method 4.

[0098] like Figure 12 As shown, unless otherwise specified, the magnetic refrigeration device 104 of Embodiment 4 has the same structure and effect as the magnetic refrigeration device 101 of Embodiment 1, and operates in the same manner as the magnetic refrigeration device 101.

[0099] It should be noted that, Figure 12This indicates the first state in which the magnet 3A of the magnetic refrigeration device 104 is in a first position relative to the magnetothermal container 1. Figure 12 This is a cross-sectional view of the magnetic refrigeration device 104, orthogonal to the central axis CA of the magnetothermal container 1. Figure 12 In the diagram, the drive unit 3B is omitted.

[0100] like Figure 12 As shown, the magnetic cooling device 104 includes a magnetic yoke 7. The magnetic yoke 7 is configured to surround the magnetic heating container 1 in a cross-section orthogonal to the central axis CA of the magnetic heating container 1. Viewed along the central axis CA of the magnetic heating container 1, the magnetic yoke 7 is configured to surround the magnetic heating container 1. In a cross-section orthogonal to the central axis CA of the magnetic heating container 1, the magnetic yoke 7 has a C-shape. In a cross-section orthogonal to the central axis CA, the magnetic yoke 7 has: a third opposing portion 71 facing a first opposing portion 11 of the recess 10 of the magnetic heating container 1; a fourth opposing portion 72 facing a second opposing portion 12 of the recess 10; and a connecting portion 73 connecting the third opposing portion 71 and the fourth opposing portion 72. The connecting portion 73 is positioned relative to the central axis CA on the side opposite to the recess 10. In a second state, the magnet 3A is positioned relative to the magnetic heating container 1 on the side opposite to the magnetic yoke 7. The material constituting the magnetic yoke 7 is a strongly magnetic material.

[0101] The distances between the third opposing portion 71 and the fourth opposing portion 72 of the magnetic yoke 7 and the magnetothermal container 1 are set such that, in the first state where the permeability of the magnetothermal material 2 has not decreased, the magnetic reluctance of the magnetic circuit passing through the magnet 3A, the magnetothermal container 1, and the magnetic yoke 7 is greater than the magnetic reluctance of the first magnetic circuit MC1. As a result, as... Figure 12 As shown, in the first state where the magnetic permeability of the magnetocaloric material 2 has not decreased, a first magnetic circuit MC1 is formed.

[0102] The thickness of the magnetic yoke 7 can be any thickness that will not cause magnetic saturation in the first state described above. It can be set based on the allowable value of magnetic leakage to the outside in the first state described above, as well as the amount of decrease in magnetic permeability caused by expected temperature changes or aging in the magnetocaloric material 2. From this point of view, 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 magnetothermal material 2 can also be a material whose magnetic permeability is easily changed due to temperature variations and aging. If the magnetic permeability of the magnetothermal material 2 decreases due to temperature changes or aging, depending on the amount of decrease, even in the first state, the first magnetic circuit MC1 may not be formed, and the magnetism of the magnet 3A may leak to the outside of the magnetothermal container 1. The yoke 7 is used to prevent the magnetism of the magnet 3A from leaking to the outside of the magnetic refrigeration device 104 in this situation.

[0104] Figure 13 Indicates in Figure 12 In the magnetic refrigeration device 104 shown, a third magnetic circuit MC3 is formed in the first state when the magnetic permeability of the magnetocaloric material 2 decreases. In the magnetic refrigeration device 104, when the magnetic permeability of the magnetocaloric material 2 decreases and the magnetic reluctance of the first magnetic circuit MC1 increases, the magnetic reluctance of the magnetic circuit passing through the magnet 3A, the first opposing portion 11, a portion of the magnetocaloric material 2 within the magnetocaloric container 1, the magnetic yoke 7, and the second opposing portion 12 is smaller than the magnetic reluctance of the first magnetic circuit MC1. For example... Figure 13 As shown, in the magnetic refrigeration device 104, when the magnetic permeability of the magnetocaloric material 2 decreases, a third magnetic circuit MC3 can be formed passing through the magnet 3A, the first opposing portion 11, the magnetocaloric material 2, the outer portion of the magnetocaloric container 1, the yoke 7, the outer portion of the magnetocaloric container 1, the magnetocaloric material 2, and the second opposing portion 12. As a result, even when the magnetic permeability of the magnetocaloric material 2 decreases, magnetic leakage to the outside of the magnetic refrigeration device 104 can be prevented in the magnetic refrigeration device 104.

[0105] In addition to having a magnetic yoke 7, the magnetic refrigeration device 104 can also have the same structure as the magnetic refrigeration device 102 or the magnetic refrigeration device 103.

[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 in Embodiment 7 described later, may also include: a plurality of protrusions protruding toward the magnetothermal container 1 and spaced apart from each other along the central axis CA; and coils wound around each of the plurality of protrusions. The magnetic refrigeration device 104 may also include a measuring unit that measures the induced electromotive force of the coils generated by the magnetic field variation of the first magnetic circuit MC1.

[0107] Implementation method 5.

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

[0109] like Figure 14 as well as Figure 15As shown, the magnetic refrigeration device 105 includes a first magnetothermal container 1A and a second magnetothermal container 1B. The first magnetothermal container 1A and the second magnetothermal container 1B each have a structure equivalent to that of the magnetothermal container 1 of the magnetic refrigeration device 101. The first magnetothermal container 1A and the second magnetothermal container 1B are configured such that their respective central axes CA extend parallel to each other, and the recesses 10 of the first magnetothermal container 1A and the second magnetothermal container 1B face each other. Preferably, the first magnetothermal container 1A and the second magnetothermal container 1B are arranged linearly symmetrically with respect to a vertical bisecting line, which is the line segment connecting the central axes CA of the first magnetothermal container 1A and the second magnetothermal container 1B.

[0110] The magnetic cooling device 105 is configured to switch between magnetic cooling and magnetic cooling by reciprocating the magnet 3A relative to the first magnetothermal container 1A and the second magnetothermal container 1B, respectively. Figure 14 The third state shown and Figure 15 The fourth state shown.

[0111] exist Figure 14 In the third state shown, magnet 3A is disposed in a first position relative to the first magnetothermal container 1A and in a second position relative to the second magnetothermal container 1B. In the third state, the first magnetic circuit MC1 is formed only in the first magnetothermal container 1A, which is one of the first magnetothermal containers 1A and the other one of the second magnetothermal containers 1B.

[0112] exist Figure 15 In the fourth state shown, magnet 3A is disposed in a second position relative to the first magnetothermal container 1A and in a first position relative to the second magnetothermal container 1B. In the fourth state, the first magnetic circuit MC1 is formed only in the second magnetothermal container 1B, which is the first magnetothermal container 1A and the second magnetothermal container 1B.

[0113] In the magnetic refrigeration device 105, by repeatedly switching between the third and fourth states, the magnetothermal material 2, housed in the first magnetothermal container 1A and the second magnetothermal container 1B, alternately heats up and absorbs heat. Therefore, the magnetic refrigeration device 105 can function as a heat pump in a single magnetic refrigeration cycle. In contrast, in the magnetic refrigeration device 101, at least two magnetic refrigeration devices 101 are required to function as heat pumps in a magnetic refrigeration cycle. When one magnetic refrigeration device 101 is in the first state, the other magnetic refrigeration device 101 needs to be in the second state; when one magnetic refrigeration device 101 is switched to the second state, the other magnetic refrigeration device 101 needs to be switched to the first state simultaneously. Therefore, by using the magnetic refrigeration device 105 as the heat pump in a magnetic refrigeration cycle, compared to the case where two magnetic refrigeration devices 101 are used to implement the heat pump in a magnetic refrigeration cycle, the number of components can be reduced, specifically, the amount of magnet 3A used can be reduced.

[0114] The distance in direction B between the first magnetothermal container 1A and the second magnetothermal container 1B is set such that a magnetic circuit is not formed passing through the first magnetothermal container 1A and the second magnetothermal container 1B. When the thickness of each of the first magnetothermal container 1A and the second magnetothermal container 1B is relatively thin, and the magnetic resistance of the magnetic circuit passing through the first magnetothermal container 1A and the second magnetothermal container 1B along the thickness direction is low, the distance in direction B between the first magnetothermal container 1A and the second magnetothermal container 1B can, for example, be more than 1 mm and less than 10 mm. When the thickness of each of the first magnetothermal container 1A and the second magnetothermal container 1B is relatively thick, and the magnetic resistance of the magnetic circuit passing through the first magnetothermal container 1A and the second magnetothermal container 1B along the thickness direction is high, the first magnetothermal container 1A can also contact the second magnetothermal container 1B.

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

[0116] The magnetic refrigeration device 105 may also include a pump for conveying the heat transfer medium 4 to the first magnetic ferrothermal container 1A and the second magnetic ferrothermal container 1B, respectively. The magnetic refrigeration device 105 may also include a pump for conveying the heat transfer medium 4 to the first magnetic ferrothermal container 1A and a pump for conveying the heat transfer medium 4 to the second magnetic ferrothermal container 1B.

[0117] Implementation method 6.

[0118] like Figure 16 As shown, unless otherwise specified, the magnetic cooling device 106 of Embodiment 6 has the same structure and effects as the magnetic cooling device 105 of Embodiment 5, and operates in the same manner as the magnetic cooling device 105. It should be noted that... Figure 16 This indicates the third state in which the magnet 3A of the magnetic refrigeration device 106 is in the first position relative to the first magnetothermal container 1A.

[0119] like Figure 16 As shown, the magnetic refrigeration device 106 differs from the magnetic refrigeration device 105 in that it also includes a first magnetic yoke 7A and a second magnetic yoke 7B. The first magnetic yoke 7A and the second magnetic yoke 7B each have the same structure as the magnetic yoke 7 of the magnetic refrigeration device 104 in Embodiment 4. The relationship between the first magnetic yoke 7A and the first magnetothermal container 1A, and the relationship between the second magnetic yoke 7B and the second magnetothermal container 1B, are equivalent to the relationship between the magnetothermal container 1 and the magnetic 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 magnetothermal container 1A, and the second magnetic yoke 7B is configured to surround the second magnetothermal container 1B. In the aforementioned cross section, the first magnetic yoke 7A and the second magnetic yoke 7B are arranged in a ring shape to surround the first magnetothermal container 1A, the second magnetothermal container 1B, and the magnet 3A as a whole.

[0121] On a cross section orthogonal to the central axis CA of the first magnetothermal container 1A and the second magnetothermal container 1B, the first yoke 7A and the second yoke 7B are connected to each other in a ring-like manner. The third opposing portion 71 of the first yoke 7A is connected to the third opposing portion 71 of the second yoke 7B. The fourth opposing portion 72 of the first yoke 7A is connected to the fourth opposing portion 72 of the second yoke 7B.

[0122] The distances between the third opposing portion 71 and the fourth opposing portion 72 of the first magnetic yoke 7A and the first magnetothermal container 1A are set such that, in the third state where the permeability of the magnetothermal material 2 housed in the first magnetothermal container 1A has not decreased, the magnetic reluctance of the magnetic circuit passing through the magnet 3A, the first magnetothermal container 1A, and the first magnetic yoke 7A is greater than the magnetic reluctance of the first magnetic circuit MC1 that should be formed in the magnet 3A and the first magnetothermal container 1A in the third state. As a result, as... Figure 16 As shown, in the third state where the magnetic permeability of the magnetothermal material 2 housed in the first magnetothermal container 1A has not decreased, a first magnetic circuit MC1 is formed in the first magnetothermal container 1A.

[0123] The distances between the third opposing portion 71 and the fourth opposing portion 72 of the second magnetic yoke 7B and the second magnetothermal container 1B are set such that, in the fourth state where the permeability of the magnetothermal material 2 housed in the second magnetothermal container 1B has not decreased, the magnetic reluctance of the magnetic circuit passing through the magnet 3A, the second magnetothermal container 1B, and the second magnetic yoke 7B is greater than the magnetic reluctance of the first magnetic circuit MC1 that should be formed in the magnet 3A and the second magnetothermal container 1B in the fourth state. In the fourth state where the permeability of the magnetothermal material 2 housed in the second magnetothermal container 1B has not decreased, the first magnetic circuit MC1 is formed in the second magnetothermal container 1B.

[0124] The thicknesses of the first magnetic yoke 7A and the second magnetic yoke 7B can each be set from the same perspective as the thickness of the magnetic yoke 7 in the magnetic cooling device 104. For example, the thickness of the first magnetic yoke 7A may be the same as the thickness of the second magnetic yoke 7B. It should be noted that the thickness of the first magnetic yoke 7A may also be different from the thickness of the second magnetic yoke 7B.

[0125] In the magnetic cooling device 106, the material constituting the magnetothermal material 2, which is respectively housed in the first magnetothermal container 1A and the second magnetothermal container 1B, can also be a material whose magnetic permeability is easily changed due to temperature changes and aging over time.

[0126] Figure 17 Indicates in Figure 16 In the magnetic refrigeration device 106 shown, a third magnetic circuit MC3 is formed in a third state when the permeability of the magnetocaloric material 2 housed in the first magnetocaloric container 1A decreases. In the magnetic refrigeration device 106, when the permeability of the magnetocaloric material 2 housed in the first magnetocaloric container 1A decreases and the magnetic reluctance of the first magnetic circuit MC1 increases, the magnetic reluctance of the third magnetic circuit MC3, which passes through the magnet 3A, the first opposing portion 11 of the first magnetocaloric container 1A, a portion of the magnetocaloric material 2 within the first magnetocaloric container 1A, the first magnetic yoke 7A, and the second opposing portion 12 of the first magnetocaloric container 1A, is smaller than the magnetic reluctance of the first magnetic circuit MC1. As a result, as... Figure 17 As shown, a third magnetic circuit MC3 can be formed in the magnetic cooling device 106.

[0127] Similarly, when the magnetic permeability of the magnetocaloric material 2 housed in the second magnetocaloric container 1B decreases, the magnetic resistance of the third magnetic circuit MC3 in the magnetic cooling device 106, which passes through the magnet 3A, the first opposing portion 11 of the second magnetocaloric container 1B, a portion of the magnetocaloric material 2 in the second magnetocaloric container 1B, the second magnetic yoke 7B, and the second opposing portion 12 of the second magnetocaloric container 1B, is also smaller than the magnetic resistance of the first magnetic circuit MC1.

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

[0129] Furthermore, in the magnetic cooling device 106, since the first magnetic yoke 7A and the second magnetic yoke 7B are configured to surround the magnet 3A, the first magnetothermal container 1A, and the second magnetothermal container 1B as a whole, the first magnetic yoke 7A and the second magnetic yoke 7B can magnetically shield their interior and exterior. For example, when the first magnetothermal container 1A and the second magnetothermal container 1B are arranged spaced apart from each other in direction B, when the magnet 3A reciprocates between the recesses 10 of the first magnetothermal container 1A and the second magnetothermal container 1B, at least a portion of the magnet 3A is exposed between the first magnetothermal container 1A and the second magnetothermal container 1B. In this case, even if the permeability of the magnetothermal material 2 does not decrease, the magnetism of the magnet 3A will leak to the exterior of the first magnetothermal container 1A and the second magnetothermal container 1B. In the magnetic cooling device 106, the first magnetic yoke 7A and the second magnetic yoke 7B prevent the magnetism that has leaked to the exterior of the first magnetothermal container 1A and the second magnetothermal container 1B from leaking to the exterior of the magnetic cooling device 106.

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

[0131] Implementation method 7.

[0132] like Figure 18 , Figure 19 as well as Figure 20 As shown, unless otherwise specified, the magnetic cooling device 107 of Embodiment 7 has the same structure and effect as the magnetic cooling device 106 of Embodiment 6, and operates in the same way as the magnetic cooling device 106.

[0133] like Figures 18-20 As shown, the first magnetic yoke 7A of the magnetic cooling device 107 includes: a plurality of protrusions 81 protruding toward the recess 10 of the first magnetothermal container 1A and spaced apart from each other along the central axis CA; and a plurality of coils 82 wound around each of the plurality of protrusions 81. Each of the plurality of protrusions 81 is made of a strongly magnetic material. The plurality of protrusions 81 are each integrally formed with, for example, the main body of the first magnetic yoke 7A. A set of protrusions 81 and coils 82 constitute a detection unit 8A for detecting changes in the magnetic field passing through the protrusions 81.

[0134] Similarly, the second magnetic yoke 7B includes: a plurality of protrusions 81 protruding toward the recess 10 of the second magnetothermal container 1B and spaced apart from each other along the central axis CA; and a plurality of coils 82 wound around each of the plurality of protrusions 81. The plurality of protrusions 81 and the plurality of coils 82 of the second magnetic yoke 7B have the same structure as the plurality of protrusions 81 and the plurality of coils 82 of the first magnetic yoke 7A. A set of protrusions 81 and coils 82 constitutes a detection unit 8B for detecting changes in the magnetic field passing through the protrusions 81.

[0135] like Figure 19 As shown, multiple protrusions 81 and multiple coils 82 are arranged at intervals between each other, for example, along the direction A of the central axis CA. The magnetic cooling device 107 also 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 along the direction B, and the greater the change, the lower the permeability of the magnetocaloric material 2.

[0136] Specifically, such as Figure 18 As shown, when the permeability of the magnetocaloric material 2 contained in the first magnetocaloric container 1A does not decrease, 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 with 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, such as Figure 20 As shown, when the permeability of the magnetocaloric material 2 decreases, the magnet 3A passing through the first yoke 7A becomes more magnetic. Therefore, the induced electromotive force generated in the coil 82 with the movement of the magnet 3A is larger than the induced electromotive force when the permeability of the magnetocaloric material 2 is not reduced. Consequently, the voltage measured in the measuring unit 9 is larger than the voltage when the permeability of the magnetocaloric material 2 is not reduced. As a result, by confirming the voltage change measured by the measuring unit 9, it is possible to confirm the change in the magnetic field appropriately applied to the magnetocaloric material 2 housed in the first magnetocaloric container 1A or the second magnetocaloric container 1B. Furthermore, by confirming the change in the amount of voltage change measured by the measuring unit 9, it is possible to estimate the change in the permeability of the magnetocaloric material 2, monitor the degree of the magnetocaloric effect of the magnetocaloric material 2, and estimate the temperature or deterioration condition of the magnetocaloric material 2 based on the degree of the magnetocaloric effect.

[0138] It should be noted that in the magnetic cooling device 107, at least either the first magnetic yoke 7A or 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 also be arranged only around the region in the magnetic cooling device 107 where the permeability of the magnetocaloric material 2 is most easily reduced.

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

[0140] Implementation method 8.

[0141] like Figure 21 As shown, unless otherwise specified, the magnetic cooling device 108 of Embodiment 8 has the same structure and effect as the magnetic cooling device 107 of Embodiment 7, and operates in the same manner as the magnetic cooling device 107.

[0142] In the magnetic cooling device 108, an adhesive 14 is filled in a position inside the first magnetic yoke 7A and the second magnetic yoke 7B, excluding the space 15 for the movement of the magnet 3A. When the adhesive 14 is filled between the first magnetic heating container 1A and the second magnetic heating container 1B and the first magnetic yoke 7A and the second magnetic yoke 7B, a core (not shown) is inserted into the space 15 for the movement of the magnet 3A. This core is removed after the adhesive 14 has cured. This forms 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 magnetothermal container 1A and the second magnetothermal container 1B. This helps to suppress the diffusion of heat generated in the magnetothermal material 2 to the outside of the first magnetothermal container 1A or the second magnetothermal container 1B.

[0144] In the magnetic cooling device 108, in addition to the moving space 15 of the magnet 3A, the adhesive 14 is filled between the first magnetic heating container 1A and the second magnetic heating container 1B and the first magnetic yoke 7A and the second magnetic yoke 7B, so that the first magnetic heating container 1A and the second magnetic heating container 1B are firmly positioned relative to the first magnetic yoke 7A and the second magnetic yoke 7B.

[0145] When magnet 3A is inserted into or removed from the recess 10 of the first magnetothermal container 1A or the second magnetothermal container 1B, a portion of the kinetic energy imparted to magnet 3A is converted into electromagnetic energy in the form of a change in the magnetic field applied to the magnetothermal material 2, generating a magnetic force between magnet 3A and magnetothermal material 2. This magnetic force may cause a shift in the relative positions of magnet 3A, the first magnetothermal container 1A and the second magnetothermal container 1B, and the first yoke 7A and the second yoke 7B, or a slight deformation of the first magnetothermal container 1A and the second magnetothermal container 1B. In particular, the aforementioned risks increase due to the repeated application of the magnetic force to magnet 3A and magnetothermal material 2 after years of continuous use. In contrast, in the magnetic cooling device 108, since the first magnetothermal container 1A and the second magnetothermal container 1B are fixed relative to the first yoke 7A and the second yoke 7B by adhesive 14, the aforementioned risks are mitigated.

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

[0147] Implementation method 9.

[0148] like Figure 22 as well as Figure 23 As shown, unless otherwise specified, the magnetic cooling device 109 of Embodiment 9 has the same structure and effect as the magnetic cooling device 108 of Embodiment 8, and operates in the same way as the magnetic cooling device 108.

[0149] like Figure 22 as well as Figure 23As shown, the magnetic cooling device 109 further includes at least one bearing 16 disposed within the space 15. The bearing 16 guides the movement of the magnet 3A in direction B. The bearing 16 is disposed between the outer peripheral surface of the first opposing portion 11 of each of the first and second magnetothermal containers 1A and the N pole surface of the magnet 3A, and between the outer peripheral surface of the second opposing portion 12 of each of the first and second magnetothermal containers 1A 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 within a space 15. The outer ring 17 is fitted between recesses 10 of a first magnetothermal container 1A and a second magnetothermal container 1B. One axial end of the outer ring 17 is connected to the recess 10 of the first magnetothermal container 1A, and the other axial end of the outer ring 17 is connected to the recess 10 of the second magnetothermal container 1B. The retainer 18 is fitted inside the outer ring 17. Pockets for holding the plurality of rolling elements 19 are formed in the retainer 18. The plurality of rolling elements 19 are held by the retainer 18 to enable rolling. The plurality of rolling elements 19 are respectively spaced apart from each other, for example, in both the axial and circumferential directions of the bearing 16.

[0151] Multiple rolling elements 19 are each capable of contacting the outer peripheral surface of the magnet 3A. The multiple rolling elements 19 are capable of rolling as the magnet 3A reciprocates along direction B. The bearing 16 may also be, for example, a sliding bearing.

[0152] The magnetic cooling device 109 may also include multiple bearings 16 arranged at intervals in direction A. From different perspectives, Figure 23 The bearing 16 shown can also be divided into multiple pieces in direction A.

[0153] Preferably, the material constituting the bearing 16 is a non-magnetic body. Preferably, multiple grooves (rolling contact surfaces) are formed on the N-pole and S-pole surfaces of the magnet 3A to accommodate a portion of each of the multiple rolling elements 19. The multiple grooves extend along direction B and are spaced apart from each other in direction A. In this way, the distance between the regions in the N-pole and S-pole surfaces where no grooves are formed and the magnetocaloric material 2 can be shortened.

[0154] In the magnetic cooling device 109, as the magnet 3A moves along direction B, a magnetic force is generated in the direction of the pole of the magnet 3A. On the other hand, in the magnetic cooling device 109, the bearing 16 can prevent the relative position of the magnet 3A with respect to the first magnetothermal container 1A and the second magnetothermal container 1B from changing, and can maintain the shortest distance (vertical distance between surfaces) between the outer peripheral surface of the recess 10 of each of the first magnetothermal container 1A and the second magnetothermal container 1B and the N pole surface and the S pole surface of the magnet 3A.

[0155] At least one of the first magnetothermal container 1A and the second magnetothermal container 1B of the magnetic refrigeration device 109 may also have the same structure as the magnetothermal container 1 of the magnetic refrigeration devices 102, 103 or 104.

[0156] Implementation method 10.

[0157] like Figures 24-27 As shown, unless otherwise specified, the magnetic cooling device 110 of Embodiment 10 has the same structure and effect as the magnetic cooling device 109 of Embodiment 9, and operates in the same manner as the magnetic cooling device 109.

[0158] In the magnetic cooling device 110, the magnet 3A includes a plurality of magnetic pieces divided in the direction of movement B of the magnet 3A. A drive unit (not shown) is capable of moving the plurality of magnetic pieces in stages. The drive unit may also be configured to move the plurality of magnetic pieces in stages individually or simultaneously. The magnet 3A may include any number of magnetic pieces, as long as there are two or more.

[0159] In the magnetic cooling device 110, by causing multiple magnets to reciprocate in stages, changes in the magnetic field applied to the first magnetic circuit MC1 and the magnetic thermal material 2 housed in the second magnetic thermal container 1B can be caused in stages. In this case, compared to the case where multiple magnets move simultaneously, the excitation speed of the magnetic thermal material 2 is reduced, thus allowing the heating of the magnetic thermal material 2 accompanying excitation and the heat absorption of the magnetic thermal material 2 accompanying demagnetization to occur slowly. As a result, in the magnetic cooling device 110, the difference between the excitation speed of the magnetic thermal material 2 and the heat exchange speed between the magnetic thermal material 2 and the heat transfer medium 4 can be reduced, and the temperature change of the magnetic thermal material 2 caused by the excitation speed of the magnetic thermal material 2 being faster than the heat exchange speed between the magnetic thermal material 2 and the heat transfer medium 4 can be suppressed.

[0160] The following is for reference Figures 24-27 The operation of the magnetic cooling device 110 is illustrated using the structure of magnet 3A divided into three magnetic pieces 3A1, 3A2, and 3A3 as an example. Each of the magnetic pieces 3A1, 3A2, and 3A3 can be driven independently.

[0161] Figure 24 This indicates the third state (hereinafter referred to as the fifth state) in which all three magnets 3A1, 3A2, and 3A3 are positioned in the first location relative to the recess 10 of the first magnetothermal container 1A. Figure 24 In the fifth state shown, all three magnet pieces 3A1, 3A2, and 3A3 are housed in the recess 10 of the first magnetothermal container 1A. At this time, a first magnetic circuit MC1A is formed passing through the magnet 3A and the first magnetothermal container 1A.

[0162] from Figure 24 Starting from the fifth state shown, only one magnet 3A1 moves along direction B and is housed in the recess 10 of the second magnetothermal container 1B, thereby enabling... Figure 25 The state shown (hereinafter referred to as the sixth state).

[0163] exist Figure 25 In the sixth state shown, the two magnet plates 3A2 and 3A3 are in the third state, positioned in the first position relative to the first magnetothermal container 1A, and the magnet plate 3A1 is in the fourth state, positioned in the first position relative to the second magnetothermal container 1B and in the second position relative to the first magnetothermal container 1A. Thus, a first magnetic circuit MC1B passing through the magnet plates 3A2 and 3A3 and the first magnetothermal container 1A, and a first magnetic circuit MC1C passing through the magnet plate 3A1 and the second magnetothermal container 1B are simultaneously formed.

[0164] exist Figure 25 In the sixth state shown, with Figure 24 Compared to the fifth state shown, the number of magnet pieces housed in the recess 10 of the first magnetothermal container 1A is reduced by one, while the number of magnet pieces housed in the recess 10 of the second magnetothermal container 1B is increased by one. As a result, the magnetothermal material 2 housed in the first magnetothermal container 1A absorbs heat, and the magnetothermal material 2 housed in the second magnetothermal container 1B generates heat.

[0165] from Figure 25 Starting from the sixth state shown, only one magnet 3A2 moves along direction B and is housed in the recess 10 of the second magnetothermal container 1B, thereby enabling... Figure 26 The state shown (hereinafter referred to as the seventh state). From Figure 25 The sixth state shown Figure 26 The switching of the seventh state shown is preferably done by means of... Figure 24 The fifth state shown Figure 25 The heat generated by the switching of the sixth state shown is transferred to the heat transfer medium 4 after the heat generated by the magnetothermal material 2 in the second magnetothermal container 1B is transferred.

[0166] exist Figure 26 In the seventh state shown, one magnet 3A3 is positioned in a first position relative to the first magnetothermal container 1A, thus being in a third state. Two magnets 3A1 and 3A2 are positioned in a first position relative to the second magnetothermal container 1B and in a second position relative to the first magnetothermal container 1A, thus being in a fourth state. This simultaneously forms a first magnetic circuit MC1C passing through the magnet 3A3 and the first magnetothermal container 1A, and a first magnetic circuit MC1B passing through the magnets 3A1 and 3A2 and the second magnetothermal container 1B.

[0167] exist Figure 26 In the seventh state shown, with Figure 25 Compared to the sixth state shown, the number of magnet pieces housed in the recess 10 of the first magnetothermal container 1A is reduced by one, while the number of magnet pieces housed in the recess 10 of the second magnetothermal container 1B is increased by one. As a result, the magnetothermal material 2 housed in the first magnetothermal container 1A absorbs heat, and the magnetothermal material 2 housed in the second magnetothermal container 1B generates heat.

[0168] from Figure 26 Starting from the seventh state shown, only one magnet 3A3 moves along direction B and is housed in the recess 10 of the second magnetothermal container 1B, thereby enabling... Figure 27 The state shown (hereinafter referred to as the eighth state). From Figure 26 The seventh state shown Figure 27 The switching of the eighth state shown is preferably done by means of... Figure 25 The sixth state shown Figure 26 The heat generated by the switching of the seventh state shown is transferred to the heat transfer medium 4 after the heat generated by the magnetothermal material 2 in the second magnetothermal container 1B is transferred.

[0169] exist Figure 27 In the eighth state shown, all three magnets 3A1, 3A2, and 3A3 are in the fourth state, which is positioned in the first location relative to the recess 10 of the second magnetothermal container 1B. Figure 27 In the state shown, all three magnet pieces 3A1, 3A2, and 3A3 are housed within the recess 10 of the second magnetothermal container 1B. At this time, a first magnetic circuit MC1A is formed, passing through the magnet 3A and the second magnetothermal container 1B.

[0170] In the above operations, the magnetocaloric material 2 housed in the second magnetocaloric container 1B is subjected to an approximately heat-insulated excitation process when switching from the fifth state to the sixth state, and to an approximately 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 moved in stages to the recess 10 of the first magnetocaloric container 1A. Thus, for the magnetocaloric material 2 housed in the first magnetocaloric container 1A and the second magnetocaloric container 1B respectively, a thermal cycle consisting of a heat-insulated excitation process, an isothermal excitation process, a heat-insulated demagnetization process, and an isothermal demagnetization process is realized.

[0171] It should be noted that in the magnetic cooling device 110, only a portion of the multiple magnet pieces may be moved back and forth along direction B. In other words, the relative position of a portion of the multiple magnet pieces relative to the first magnetothermal container 1A or the second magnetothermal container 1B may be maintained. For example, in the magnetic cooling device 110, only magnet pieces 3A1 and 3A2 may be able to move back and forth relative to the first magnetothermal container 1A and the second magnetothermal container 1B, respectively. In this case, the switch from the seventh state to the eighth state is not performed, but the switch from the seventh state to the sixth state is performed. In this way, the amplitude of the magnetic field applied to the magnetothermal material 2 respectively housed in the first magnetothermal container 1A and the second magnetothermal container 1B can be changed in stages, and the output of the magnetic cooling device 110 can be adjusted in stages.

[0172] At least one of the first magnetothermal container 1A and the second magnetothermal container 1B of the magnetic refrigeration device 110 may also have the same structure as the magnetothermal container 1 of the magnetic refrigeration devices 102, 103 or 104.

[0173] Explanation of reference numerals in the attached figures

[0174] 1 Magnetothermal container, 1A First magnetothermal container, 1B Second magnetothermal container, 2 Magnetothermal material, 3 Magnetic field generating device, 3A Magnet, 3A1, 3A2, 3A3 Magnet sheets, 3B Driving unit, 4 Heat transfer medium, 6 Pump, 7 Magnetic yoke, 7A First magnetic yoke, 7B Second magnetic yoke, 8A, 8B Detection unit, 9 Measuring unit, 10 Recess, 11 First opposing portion, 12 Second opposing portion, 13, 73 Connecting portion, 14 Adhesive, 15 Space, 16 Bearing, 17 Outer ring, 18 Retainer, 19 Rolling element, 20 Plate-shaped component, 61 First piping, 62 Second piping, 71 Third opposing portion, 72 Fourth opposing portion, 81 Protrusion, 82 Coil, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110 Magnetic refrigeration device.

Claims

1. A magnetic refrigeration device, wherein, The magnetic refrigeration device includes: Magnetothermal materials; A magnetothermal container that holds the magnetothermal material and is configured to form a flow path for a heat transport medium around the magnetothermal material; as well as A magnetic field generating device, 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 where the magnetic field generating device applies the magnetic field to the magnetocaloric material housed in the magnetocaloric container, the magnetic field forms a first magnetic circuit through the magnetocaloric material housed inside the magnetocaloric container. The magnetothermal container is a tubular component configured so that the heat transfer medium flows inside it. The magnetic field generating device includes a magnet and a driving unit, which causes the magnetic field to vary by changing the relative position of the magnet with respect to the magnetothermal container between a first position and a second position. In the magnetothermal container, a recess is formed on a cross-section orthogonal to the central axis of the magnetothermal container. The recess is recessed relative to the outer peripheral surface of the magnetothermal container and has a first opposing portion and a second opposing portion that face each other in the circumferential direction relative to the central axis. When the magnet is positioned in the first position relative to the magnetothermal container, the magnet is housed in the recess, the N pole of the magnet faces the first opposing portion, and the S pole of the magnet faces the second opposing portion, forming a first magnetic circuit through the magnet, the first opposing portion, the magnetothermal material housed inside the magnetothermal container, and the second opposing portion.

2. The magnetic refrigeration device as described in claim 1, wherein, In a cross section orthogonal to the central axis of the magnetothermal container, the magnetothermal container has a C-shape, with the first opposing portion and the second opposing portion being the two ends of the C-shape.

3. The magnetic refrigeration device as described in claim 1, wherein, The magnetocaloric material is formed inside the magnetocaloric container as a plurality of plate-like components extending along the central axis. In a cross section orthogonal to the central axis of the magnetothermal container, one end of each of the plurality of plate-shaped components is connected to the inner circumferential surface of the first opposing portion, and the other end of each of the plurality of plate-shaped components is connected to the inner circumferential surface of the second opposing portion. The plurality of plate-shaped components are arranged at intervals relative to each other in the radial direction relative to the central axis.

4. The magnetic refrigeration device as described in claim 1, wherein, The magnetothermal container has a first inflow / outflow section and a second inflow / outflow section. The first inflow / outflow section is located at one end along the central axis and allows the heat transfer medium to flow in or out. The second inflow / outflow section is located at the other end along the central axis and allows the heat transfer medium to flow in or out. The magnetic refrigeration device also includes a pump for causing the heat transfer 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 positioned in the first position relative to the magnetothermal container, the magnet extends between the first inflow / outflow portion and the second inflow / outflow portion in a direction along the central axis.

5. The magnetic refrigeration device according to any one of claims 1 to 4, wherein, The magnetic refrigeration device also includes a magnetic yoke, which, when viewed from a direction along the central axis, is configured to surround the magnetothermal container. When the magnetic permeability of the magnetocaloric material decreases and the magnetic resistance of the first magnetic circuit increases, the magnetic resistance of the magnetic circuit through the magnet, the first opposing portion, the magnetocaloric material housed inside the magnetocaloric container, the yoke, and the second opposing portion is smaller than the magnetic resistance of the first magnetic circuit.

6. The magnetic refrigeration device according to any one of claims 1 to 4, wherein, The magnetic refrigeration device includes a first magnetothermal container and a second magnetothermal container. The first magnetothermal container and the second magnetothermal container are respectively configured as the magnetothermal container. The first and second magnetocaloric containers are configured such that their respective central axes extend parallel to each other, and their respective recesses face each other. The drive unit can switch between the third state and the fourth state. In the third state, the magnet is housed in the recess of the first magnetothermal container, positioned at the first position relative to the first magnetothermal container and at the second position relative to the second magnetothermal container. In the fourth state, the magnet is housed in the recess of the second magnetothermal container, positioned at the first position relative to the second magnetothermal container and at the second position relative to the first magnetothermal container.

7. The magnetic refrigeration device as described in claim 6, wherein, The magnetic refrigeration device further includes a magnetic yoke, which, when viewed from a direction along the central axis, is configured to surround the magnet, the first magnetocaloric container, and the second magnetocaloric container. When the magnetic permeability of the magnetocaloric material decreases and the magnetic resistance of the first magnetic circuit increases, the magnetic resistance of the magnetic circuit through the magnet, the first opposing portion, the magnetocaloric material housed inside the magnetocaloric container, the yoke, and the second opposing portion is smaller than the magnetic resistance of the first magnetic circuit.

8. The magnetic refrigeration device as described in claim 7, wherein, The magnetic yoke includes: protrusions projecting toward the recesses and spaced apart from each other along the central axis; and coils wound around each of the protrusions. The magnetic refrigeration device further includes a measuring unit that measures the induced electromotive force of the coil generated by the magnetic field variation of the first magnetic circuit.

9. The magnetic refrigeration device as claimed in claim 7, wherein, When viewed from a direction along the central axis, the magnetic yoke is configured in a ring shape to surround the first magnetocaloric container, the second magnetocaloric container, and the magnet as a whole. An adhesive is filled between the first and second magnetothermal containers and the yoke, in addition to the space for the magnet to move.

10. The magnetic refrigeration device as claimed in claim 6, wherein, The magnetic refrigeration device further includes bearings disposed between the outer peripheral surfaces of the first opposing portions of the first and second magnetic cryogenic containers and the N pole surface of the magnet, and between the outer peripheral surfaces of the second opposing portions of the first and second magnetic cryogenic containers and the S pole surface of the magnet. The axial direction of each bearing is along the central axis.

11. The magnetic refrigeration device as claimed in claim 6, wherein, The drive unit is configured to move the magnet relative to the first magnetothermal container and the second magnetothermal container, respectively. The magnet comprises a plurality of magnet plates segmented in the direction of the magnet's movement. The drive unit enables the plurality of magnet pieces to move in stages.

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