JP2018146155A - Heat exchanger and magnetic heat pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of uniformizing temperature distribution on a cross section orthogonal to a longitudinal direction, with continuous temperature gradient generated easily.SOLUTION: An MCM heat exchanger 10 includes a first aggregate 11A constituted by bundling a plurality of first twisted wires 12A, and a container 13 storing the first aggregate 11A. The first twisted wires 12A is constituted by mutually twisting a plurality of wires. The plurality of wires has a first wire 121 composed of a first magnetic heat quantity effect material having a first Curie point T, and a second wire 122 composed of a second magnetic heat quantity effect material having a second Curie point Tdifferent from the first Curie point T.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heat exchanger used in a magnetic heat pump apparatus using a magnetocaloric effect, and a magnetic heat pump apparatus including the heat exchanger.

  As a magnetocaloric element used in a magnetocaloric effect type heat pump device, in order to facilitate the generation of a continuous temperature gradient, a first block formed of a first material and a second block formed of a second material In addition, there is known one in which a mixing unit provided in an adjacent portion between the first block and the second block is connected in series (so-called cascade connection) (see, for example, Patent Document 1).

  In this magnetocaloric element, the first material exhibits a magnetocaloric effect in the first temperature zone, and the second material exhibits a magnetocaloric effect in a second temperature zone partially overlapping with the first temperature zone, In the mixing portion, the first material and the second material exist in a mixed state. Moreover, a rod-shaped body is illustrated as a shape of the element member which comprises a 1st and 2nd block (refer especially the paragraph [0107] of patent document 1).

JP-A-2006-99040

  In the heat exchanger in which the first block, the mixing unit, and the second block are cascade-connected, the pressure loss can be reduced while securing a sufficiently large specific surface area by forming the element member in a bar shape. . However, when the rod-shaped body made of the first material and the rod-shaped body made of the second material are simply accommodated in the mixing section, the first material and the second material are distributed unevenly, so that the longitudinal direction of the magnetocaloric element is There is a problem in that the temperature distribution in the cross section orthogonal to may become non-uniform.

  The problem to be solved by the present invention includes a heat exchanger capable of facilitating the generation of a continuous temperature gradient and uniforming the temperature distribution in a cross section perpendicular to the longitudinal direction, and the heat exchanger. Another object is to provide a magnetic heat pump device.

  [1] A heat exchanger according to the present invention includes a first assembly configured by bundling a plurality of first stranded wires, and a container in which the first assembly is accommodated, The first stranded wire is formed by twisting a plurality of wires together, and the plurality of wires are formed of a first magnetocaloric material having a first Curie point. And a second wire made of a second magnetocaloric material having a second Curie point different from the first Curie point.

  [2] In the above invention, the container has a first opening located at one end and a second opening located at the other end, and the first opening The first direction toward the second opening and the extending direction of the first assembly may be substantially parallel.

  [3] In the above invention, the heat exchanger includes a second assembly configured by bundling a plurality of second stranded wires, and each of the second stranded wires twists the wire together. The second assembly is accommodated in the container so as to be positioned on the second opening side with respect to the first assembly along the first direction, The first ratio is a ratio of the number of the first wires constituting the first stranded wire and the number of the second wires, and the second ratio constitutes the second stranded wire. It is a ratio of the number of the first wire rods to the number of the second wire rods, and the first ratio and the second ratio may be different from each other.

  [4] In the above invention, the number of the first wire constituting the first stranded wire is relatively larger than the number of the first wire constituting the second stranded wire, The number of the second wires constituting the first stranded wire may be relatively small with respect to the number of the second wires constituting the second stranded wire.

  [5] In the above invention, the heat exchanger includes a third aggregate configured by bundling a plurality of third twisted wires and a fourth aggregate configured by bundling a plurality of fourth twisted wires. And the third twisted wire is formed by twisting the plurality of first wires together, and the fourth twisted wire is twisted by the plurality of second wires. The third assembly is accommodated in the container so as to be positioned on the first opening side with respect to the first assembly in the first direction, and the fourth assembly The assembly may be accommodated in the container so as to be positioned on the second opening side with respect to the second assembly in the first direction.

  [6] A magnetic heat pump device according to the present invention includes at least one heat exchanger, a magnetic field changing unit that applies a magnetic field to the wire and changes the magnitude of the magnetic field, and the heat exchange via a pipe. The first and second external heat exchangers respectively connected to the heat exchanger, and the first external heat from the heat exchanger as the magnitude of the magnetic field applied to the wire by the magnetic changing means changes. And a fluid supply means for supplying fluid to the exchanger or the second external heat exchanger.

  According to the present invention, a first stranded wire is formed by twisting together a plurality of wires including first and second wires having different Curie points, and a plurality of the first stranded wires are bundled. Thus, the first aggregate is formed. As a result, the temperature distribution in the cross section orthogonal to the longitudinal direction of the heat exchanger can be made uniform while facilitating the generation of a continuous temperature gradient in the heat exchanger.

FIG. 1 is a diagram showing an overall configuration of a magnetic heat pump device according to an embodiment of the present invention, and shows a state where a piston is in a first position. FIG. 2 is a diagram illustrating the overall configuration of the magnetic heat pump device according to the embodiment of the present invention, and is a diagram illustrating a state where the piston is in the second position. FIG. 3 is an exploded perspective view showing the configuration of the MCM heat exchanger in the embodiment of the present invention. FIG. 4 is a cross-sectional view of the MCM heat exchanger in the embodiment of the present invention, and is a cross-sectional view of the MCM heat exchanger cut along the longitudinal direction. 5A is a cross-sectional view of the first assembly according to the embodiment of the present invention, and is a view taken along the line VA-VA of FIG. 4, and FIG. 5B is a diagram illustrating the implementation of the present invention. It is sectional drawing of the 1st strand wire in a form. FIG. 6A is a cross-sectional view of the second assembly in the embodiment of the present invention, which is a cross-sectional view taken along the line VIA-VIA of FIG. 4, and FIG. It is sectional drawing of the 2nd twisted wire in embodiment. FIG. 7A is a cross-sectional view of the third assembly in the embodiment of the present invention, which is a cross-sectional view taken along the line VIIA-VIIA of FIG. 4, and FIG. It is sectional drawing of the 3rd strand wire in embodiment. FIG. 8A is a cross-sectional view of the fourth aggregate in the embodiment of the present invention, which is a cross-sectional view taken along the line VIIIA-VIIIA of FIG. 4, and FIG. It is sectional drawing of the 4th strand wire in embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are diagrams showing the overall configuration of a magnetic heat pump device according to an embodiment of the present invention, FIGS. 3 and 4 are diagrams showing an MCM heat exchanger according to a first embodiment of the present invention, and FIGS. 8A is a cross-sectional view of the first to fourth aggregates in the present embodiment, and FIGS. 5B to 8B are cross-sectional views of the first to fourth stranded wires in the present embodiment. is there.

  The magnetic heat pump device 1 in the present embodiment is a heat pump device using a magnetocaloric effect, and as shown in FIGS. 1 and 2, first and second MCM heat exchangers 10 and 20, The piston 30, the permanent magnet 40, the low temperature side heat exchanger 50, the high temperature side heat exchanger 60, the pump 70, the pipes 81 to 84, and the switching valve 90 are provided.

  The first and second MCM heat exchangers 10 and 20 in the present embodiment correspond to an example of a heat exchanger in the present invention, and the piston 30 and the permanent magnet 40 in the present embodiment serve as an example of a magnetic changing unit in the present invention. The low temperature side heat exchanger 50 and the high temperature side heat exchanger 60 correspond to an example of the first and second external heat exchangers in the present invention, and the pipes 81 to 84 in the present embodiment are the pipes in the present invention. It corresponds to an example, and the pump 70 and the switching valve 90 in the present embodiment correspond to an example of the fluid supply means in the present invention.

  As shown in FIGS. 3 and 4, the first MCM heat exchanger 10 includes first to fourth aggregates 11A to 11D, and a container (case) 13 in which the aggregates 11A to 11D are accommodated, And terminal members 16 and 17 connected to both ends of the container 13. The first to fourth aggregates 11A to 11D are different in that the types of stranded wires constituting the aggregates 11A to 11D are different.

  The first to fourth aggregates 11A to 11D in the present embodiment correspond to an example of the first to fourth aggregates in the present invention, and the container 13 in the present embodiment corresponds to an example of the container in the present invention.

  In addition, the number of aggregates constituting the first MCM heat exchanger 10 is not particularly limited to the above number, and the first MCM heat exchanger may be configured using 5 or more aggregates. Moreover, in this embodiment, although the 1st-4th aggregate | assembly 11A-11D is accommodated in the one container 13, the structure of a MCM heat exchanger is not specifically limited to this. For example, the MCM heat exchanger may be configured by accommodating the first to fourth assemblies in separate containers and connecting these containers to each other.

  As shown in FIGS. 5A and 5B, the first aggregate 11A is configured by bundling a plurality of first stranded wires 12A. The plurality of first stranded wires 12A are bundled together in a direction intersecting the longitudinal direction of the first stranded wire 12A. In other words, the plurality of first stranded wires 12A are adjacent to each other so that the side surfaces of the first stranded wires 12A are in contact with each other. As a result, a channel 123 (see FIG. 5A) is formed between the side surfaces of the first stranded wire 12A.

Each first stranded wire 12A is formed by twisting three wires together. Specifically, the first stranded wire 12A is formed by twisting two first wire rods 121 and one second wire rod 122 together. That is, in this embodiment, the ratio of the number of the first wire 121 constituting each of the first twisted wire 12A _{(N 1)} and the number of the second wire 122 _{(N 2)} is 2: 1 when the (N ₁ : N ₂ = 2: 1). The ratio (N ₁ : N ₂ = 2: 1) in the first stranded wire 12A corresponds to an example of the first ratio in the present invention. In addition, if the number of the wire which comprises each 1st strand 12A is plural, it will not be specifically limited.

  Although it does not specifically limit as how to twist a wire, For example, a collective twist, a concentric twist, a composite twist etc. can be illustrated. Aggregate twisting is a twisting method in which a plurality of wires are gathered together and twisted in the same direction around the axis of the aggregate. Concentric twisting is a twisting method in which concentric circles are twisted around a plurality of wires around the core wire. The composite twist is a twisting method in which a child twisted wire obtained by twisting a plurality of wires into a concentric twist or a collective twist is further twisted into a concentric twist or a collective twist.

  In the present embodiment, the first and second wire rods 121 and 122 are twisted to form the first stranded wire 12A, and the plurality of first stranded wires 12A are bundled to form the first aggregate 11A. doing. Therefore, as shown in FIG. 5A, in the first assembly 11A, the first wire 121 is arranged substantially evenly without being biased, and the second wire 122 is also not biased. They are arranged substantially evenly.

  The 1st and 2nd wire 121,122 is comprised from the magnetocaloric effect material (MCM: Magnetocaloric Effect Material) which has a magnetocaloric effect. When a magnetic field is applied to the wires 121 and 122 composed of the MCM, the magnetic spins are reduced by aligning the electron spins, the wires 121 and 122 generate heat, and the temperature rises. On the other hand, when the magnetic field is removed from the wires 121 and 122, the electron spin becomes messy and the magnetic entropy increases, and the wires 121 and 122 absorb heat and the temperature decreases.

  The MCM constituting the wires 121 and 122 is not particularly limited as long as it is a magnetic material. For example, the MCM has a Curie point (Curie temperature) in a normal temperature range of about 10 ° C. to 30 ° C. It is preferable that it is a magnetic body which exhibits. Specific examples of such MCMs include gadolinium (Gd), gadolinium alloys, lanthanum-iron-silicon (La-Fe-Si) compounds, and the like.

In particular, in the present embodiment, the first wire 121 is composed of a first MCM having a first Curie point T _C1 , and this first MCM has a magnetocaloric value in the first temperature range R _TC1 . The effect is expressed. In contrast, the second wire 122 is composed of a second MCM having a second Curie point _{T C2,} the second MCM may express magnetocaloric effect in the second temperature range _{R TC2} To do. Second Curie point _{T C2} of the second wire 122 is relatively high with respect to the first Curie point _{T C1} of the first wire _{121 (T C2> T C1)} .

That is, in the present embodiment, the first wire 121 and the second wire 122 are composed of MCMs having different Curie points T _C1 and T _C2 . Further, in the present embodiment, the first temperature range R _TC1 and the second temperature range R _TC2 are different from each other, and the entire second temperature range R _{TC2 is} the entire first temperature range R _TC1 . On the other hand, it is relatively high (R _TC2 > R _TC1 ). At least a portion of the second temperature range _{R TC2} is if the deviation from the first temperature range _{R TC1,} the first temperature range _{R TC1} and the second temperature range _{R TC2} are partially overlapping Also good.

The first wire 121 in the present embodiment corresponds to an example of the first wire in the present invention, and the second wire 122 in the present embodiment corresponds to an example of the second wire in the present invention. Further, an example of a second Curie point in the first Curie point T _C1 corresponds to an example of a first Curie point in the present invention in this embodiment, the second Curie point T _C2 in the present embodiment the present invention It corresponds to.

  Although the 1st and 2nd wire 121,122 in this embodiment is a wire which has circular cross-sectional shape, the 1st and 2nd wire 121,122 may have cross-sectional shapes other than circular. Although it does not specifically limit as a wire diameter of the 1st and 2nd wire 121,122, For example, it is preferable that it is 0.01-1 mm.

As shown in FIGS. 6A and 6B, the second aggregate 11B is configured by bundling a plurality of second stranded wires 12B. The second stranded wire 12B is also configured by twisting three wires together. The second stranded wire 12b is different from the above-described first stranded wire 12A in that it is formed by twisting one first wire 121 and two second wires 122 together. That is, in this embodiment, the ratio of the number of the first wire 121 constituting the respective second stranded wire 12B _{(N 1)} and the number of the second wire 122 _{(N 2)} is 1: 2. But (N ₁ : N ₂ = 1: 2). The ratio (N ₁ : N ₂ = 1: 2) in the second stranded wire 12B corresponds to an example of the second ratio in the present invention. In addition, if the number of the wire which comprises each 2nd twisted wire 12B is plural, it will not be specifically limited.

  The plurality of second stranded wires 12B are bundled together in a direction intersecting the longitudinal direction of the second stranded wire 12B. As a result, a flow path 123 (see FIG. 6A) is formed between the side surfaces of the second stranded wire 12B.

  In the present embodiment, similarly to the first assembly 11A described above, the first and second wire rods 121 and 122 are twisted to form the second stranded wire 12B, and the plurality of second stranded wires 12B are formed. The second aggregate 11B is configured by bundling a plurality. For this reason, as shown to Fig.6 (a), in the 2nd aggregate | assembly 11B, while the 1st wire 121 is arrange | positioned substantially equally without biasing, the 2nd wire 122 is also not biased. They are arranged substantially evenly.

As shown in FIG. 7A and FIG. 7B, the third aggregate 11C is configured by bundling a plurality of third stranded wires 12C. The third stranded wire 12C is also configured by twisting three wires together. Specifically, the third stranded wire 12 </ b> C is formed by twisting the three first wire rods 121, and does not use the second wire rod 122. That is, in this embodiment, the ratio of the number of the first wire 121 constituting each third stranded wire 12C _{(N 1)} and the number of the second wire 122 _{(N 2)} is 3: 0 when (N ₁ : N ₂ = 3: 0). In addition, if the number of the wire which comprises each 3rd twisted wire 12C is plural, it will not be specifically limited.

  The plurality of third stranded wires 12C are bundled together in a direction intersecting the longitudinal direction of the third stranded wire 12C. As a result, a channel 123 (see FIG. 7A) is formed between the side surfaces of the third stranded wire 12C.

As shown in FIGS. 8A and 8B, the fourth aggregate 11C is configured by bundling a plurality of fourth stranded wires 12D. The fourth stranded wire 12D is also configured by twisting three wires together. Specifically, the fourth stranded wire 12 </ b> D is formed by twisting three second wire rods 122, and does not use the first wire rod 121. That is, in this embodiment, the ratio of the number of the first wire 121 constituting each of the fourth twisted wire 12D _{(N 1)} and the number of the second wire 122 _{(N 2)} is, 0: 3. But (N ₁ : N ₂ = 0: 3). In addition, if the number of the wire which comprises each 4th twisted wire 12D is plural, it will not be specifically limited.

  The plurality of fourth stranded wires 12D are bundled together in a direction intersecting the longitudinal direction of the fourth stranded wire 12D. As a result, a channel 123 (see FIG. 8A) is formed between the side surfaces of the fourth stranded wire 12D.

  As shown in FIGS. 3, 4, and 5 (a) to 8 (a), the container 13 that accommodates the first to fourth assemblies 11 </ b> A to 11 </ b> D includes an accommodation portion 14 and a lid portion 15. It has a cylindrical shape with a rectangular cross section. The container 13 has a first opening 131 at one end thereof and a second opening 132 at the other end thereof. In addition, if the shape of the container 13 is a cylinder shape, it will not be specifically limited above, For example, you may have a circular or polygonal cross section.

  The first opening 131 of the container 13 in the present embodiment corresponds to an example of the first opening of the container in the present invention, and the second opening 132 of the container 13 in the present embodiment is the second opening of the container in the present invention. It corresponds to an example.

  The accommodating portion 14 includes a bottom portion 141 constituting a bottom plate of the container 13 and a pair of side portions 142 and 143 constituting side walls on both sides of the container 13. An opening 144 is formed between the upper ends of the pair of side portions 142 and 143, and as a result, the accommodating portion 14 is U-shaped in a cross section along a direction substantially perpendicular to the axial direction ( It has a substantially U-shaped cross-sectional shape.

  The lid 15 is a rectangular plate member. The lid portion 15 is fixed to the upper ends of the pair of side portions 142 and 143. The container 13 is formed by closing the opening 144 of the accommodating portion 14 by the lid portion 15.

  The first to fourth aggregates 11A to 11D include the longitudinal direction (Y-axis direction in the figure) of the aggregates 11A to 11D and the axial direction of the container 13 (from the first opening 131 to the second opening 132). In the container 13 so as to substantially coincide with the heading direction. In the present embodiment, as the first opening 131 approaches the second opening 132, the third aggregate 11C, the first aggregate 11A, the second aggregate 11B, and the fourth aggregate 11D The first to fourth aggregates 11A to 11D are arranged in order.

That is, in the present embodiment, in the present embodiment, as the wire constituting the first to fourth stranded wires 12A to 12D approaches the second opening 132 from the first opening 131, the first wire 121 is formed. While the number (N ₁ ) decreases, the number (N ₂ ) of the second wires 122 increases, and the number (N ₁ ) of the _first wires 121 and the number (N ₁ ) of the second wires 122 (N ₂ ) ratio (N ₁ : N ₂ ) changes stepwise from [3: 0] → [2: 1] → [1: 2] → [0: 3].

If the number of first wires 121 (N ₁ ) decreases and the number of second wires 122 (N ₂ ) increases as the first opening 131 approaches the second opening 132, the ratio of the number of the first number of the wire 121 _{(N 1)} and the second wire rod 122 in the first to fourth twisted wire _{12A~12D (N 2) (N 1} : N 2) is not particularly limited to the above .

  As shown in FIGS. 3 and 4, the first terminal member (connection member) 16 includes a connection port 161 and a connection port 162 larger than the connection port 161. As the first terminal member 16, for example, a heat shrinkable tube, a resin molded product, a metal processed product, or the like can be used.

  One end of the container 13 is inserted into the connection port 162 of the first terminal member 16, and the first terminal member 16 is fixed to the end of the container 13. In addition, a first low temperature side pipe 81 is connected to the connection port 161 of the first terminal member 16, and as shown in FIG. 1, the first MCM heat exchanger 10 includes the first low temperature side pipe 81. The low temperature side heat exchanger 50 communicates with the low temperature side pipe 81.

  The second terminal member 17 has the same configuration as the first terminal member 16 described above. The other end of the container 13 is inserted into the connection port 172 of the second terminal member 17, and the second terminal member 17 is fixed to the end of the container 13. Further, a first high temperature side pipe 83 is connected to the connection port 171 of the second terminal member 17, and as shown in FIG. 1, the first MCM heat exchanger 10 has the first high temperature side pipe 83. The high temperature side heat exchanger 60 communicates with the high temperature side pipe 83.

  The container 23 of the second MCM heat exchanger 20 also accommodates the first to fourth assemblies 21A to 21D (see FIG. 2). As in the first MCM heat exchanger 10, one end of the container 23 is inserted into the first terminal member, and the first terminal member is fixed to the container 23. The other end of the container 23 is inserted into the second terminal member, and the second terminal member is fixed to the container 23. The second MCM heat exchanger 20 communicates with the low temperature side heat exchanger 50 via a second low temperature side pipe 82 connected to the connection port 261 of the first terminal member. The second MCM heat exchanger 20 communicates with the high temperature side heat exchanger 60 via the second high temperature side pipe 84 connected to the connection port 271 of the second terminal member.

  The first to fourth assemblies 21A to 21D of the second MCM heat exchanger 20 have the same configuration as the first to fourth assemblies 11A to 11D of the first MCM heat exchanger 10. ing. The container 23 of the second MCM heat exchanger 20 has the same configuration as the container 13 of the first MCM heat exchanger 10. Further, the terminal member of the second MCM heat exchanger 20 has the same configuration as the terminal members 16 and 17 of the first MCM heat exchanger 10.

  For example, when the air conditioner using the magnetic heat pump device 1 in the present embodiment functions as cooling, the room is cooled by exchanging heat between the low temperature side heat exchanger 50 and the indoor air, The heat is radiated to the outside by performing heat exchange between the high temperature side heat exchanger 60 and the outside.

  On the other hand, when the air conditioner functions as heating, the room is warmed by exchanging heat between the high temperature side heat exchanger 60 and the indoor air, and the low temperature side heat exchanger 50 and the outdoor side. Heat is absorbed from outside by exchanging heat with other air.

  As described above, a circulation path including the four heat exchangers 10, 20, 50, 60 is formed by the two low temperature side pipes 81, 82 and the two high temperature side pipes 83, 84. A liquid medium is pumped into the circulation path. Specific examples of the liquid medium include liquids such as water, antifreeze, ethanol solution, or a mixture thereof. The liquid medium in the present embodiment corresponds to an example of a fluid in the present invention.

  The two MCM heat exchangers 10 and 20 are accommodated inside the piston 30. The piston 30 can reciprocate between the pair of permanent magnets 40 by an actuator 35. Specifically, the piston 30 can reciprocate between a “first position” as shown in FIG. 1 and a “second position” as shown in FIG. In addition, as an example of the actuator 35, an air cylinder etc. can be illustrated, for example.

  Here, the “first position” refers to a piston in which the first MCM heat exchanger 10 is not interposed between the permanent magnets 40 and the second MCM heat exchanger 20 is interposed between the permanent magnets 40. 30 positions. On the other hand, the “second position” is a piston in which the first MCM heat exchanger 10 is interposed between the permanent magnets 40 and the second MCM heat exchanger 20 is not interposed between the permanent magnets 40. 30 positions.

  Note that the permanent magnet 40 may be reciprocated by the actuator 35 instead of the first and second MCM heat exchangers 10 and 20. Alternatively, an electromagnet having a coil may be used in place of the permanent magnet 40. In this case, a mechanism for moving the MCM heat exchangers 10, 20 or the magnet becomes unnecessary. In addition, when an electromagnet having a coil is used, the magnitude (intensity) of the magnetic field applied to the wires 121 and 122 is changed instead of the application / removal of the magnetic field to the wires 121 and 122 of the MCM heat exchangers 10 and 20. You may make it do.

  The switching valve 90 is provided in the first high temperature side pipe 83 and the second high temperature side pipe 84. The switching valve 90 switches the liquid medium supply destination to the first MCM heat exchanger 10 or the second MCM heat exchanger 20 by the pump 70 in conjunction with the operation of the piston 30 described above, The connection destination of the high temperature side heat exchanger 60 can be switched to the second MCM heat exchanger 20 or the first MCM heat exchanger 10.

  Next, operation | movement of the magnetic heat pump apparatus 1 in this embodiment is demonstrated, referring FIG.1 and FIG.2.

  First, when the piston 30 is moved to the “first position” shown in FIG. 1, the first to fourth aggregates 11 </ b> A to 11 </ b> D of the first MCM heat exchanger 10 are demagnetized and the temperature thereof decreases. On the other hand, the first to fourth aggregates 21A to 21D of the second MCM heat exchanger 20 are magnetized and the temperature rises.

  At the same time, the switching valve 90 causes the pump 70 → the first high temperature side pipe 83 → the first MCM heat exchanger 10 → the first low temperature side pipe 81 → the low temperature side heat exchanger 50 → the second low temperature side pipe. 82 → second MCM heat exchanger 20 → second high temperature side pipe 84 → high temperature side heat exchanger 60 → pump 70 is formed.

  For this reason, the liquid medium is cooled by the first to fourth assemblies 11A to 11D of the first MCM heat exchanger 10 whose temperature has decreased due to demagnetization, and the liquid medium is supplied to the low temperature side heat exchanger 50. The low temperature side heat exchanger 50 is cooled.

  On the other hand, the liquid medium is heated by the first to fourth assemblies 21 </ b> A to 21 </ b> D of the second MCM heat exchanger 20 that has been magnetized and the temperature has risen, and the liquid medium is supplied to the high temperature side heat exchanger 60. Thus, the high temperature side heat exchanger 60 is heated.

  Next, when the piston 30 is moved to the “second position” shown in FIG. 2, the first to fourth assemblies 11 </ b> A to 11 </ b> D of the first MCM heat exchanger 10 are magnetized and the temperature rises. . On the other hand, the 1st-4th aggregate 21A-21D of the 2nd MCM heat exchanger 20 is demagnetized, and the temperature falls.

  At the same time, the switching valve 90 causes the pump 70 → second high temperature side pipe 84 → second MCM heat exchanger 20 → second low temperature side pipe 82 → low temperature side heat exchanger 50 → first low temperature side pipe. A “second path” consisting of 81 → first MCM heat exchanger 10 → first high temperature side pipe 83 → high temperature side heat exchanger 60 → pump 70 is formed.

  For this reason, the liquid medium is cooled by the first to fourth assemblies 21A to 21D of the second MCM heat exchanger 20 whose temperature has decreased due to demagnetization, and the liquid medium is supplied to the low temperature side heat exchanger 50. The low temperature side heat exchanger 50 is cooled.

  On the other hand, the liquid medium is heated by the first to fourth assemblies 11A to 11D of the first MCM heat exchanger 10 that has been magnetized and the temperature thereof is increased, and the liquid medium is supplied to the high temperature side heat exchanger 60. Thus, the high temperature side heat exchanger 60 is heated.

  By the reciprocation between the “first position” and the “second position” of the piston 30 described above, the first to fourth aggregates of the first and second MCM heat exchangers 10 and 20 are obtained. The application and removal of the magnetic field to and from 11A to 11D and 21A to 21D are repeated. When the first and second MCM heat exchangers 10 and 20 reach a steady operation state, the first to fourth aggregates 11A to 11D and 21A of the first and second MCM heat exchangers 10 and 20 are obtained. A predetermined temperature gradient occurs at ~ 21D.

  That is, in the first to fourth assemblies 11A to 11D of the first MCM heat exchanger 10, the end on the first low temperature side pipe 81 side is the lowest temperature, and the first high temperature side pipe 83 side A temperature gradient occurs with the highest temperature at the end. Similarly, also in the 1st-4th aggregate 21A-21D of the 2nd MCM heat exchanger 20, the edge part by the side of the 2nd low temperature side piping 82 is the lowest temperature, and the 2nd high temperature side piping 84 A temperature gradient occurs where the end on the side is the highest temperature.

  Here, generally, when the temperature gradient generated in the MCM heat exchanger includes a portion that deviates from the Curie point of the MCM, a sufficient magnetocaloric effect cannot be obtained.

In contrast, in the present embodiment, the third twisted wire 12C of the third assembly 11C is located in the first low temperature side pipe 81 side, the first wire 121 having a first Curie point T _C1 while is configured, a fourth twisted wire 12D of the fourth assembly 11D which is located on the first hot side pipe 83 side, constituted by a second wire 122 having a second Curie point T _C2 The second Curie point T _C2 is relatively higher than the first Curie point T _C1 of the first wire 121 (T _C2 > T _C1 ). For this reason, even if the temperature gradient generated in the first to fourth assemblies 11A to 11D of the first MCM heat exchanger 10 in the steady operation state is wide, the magnetocaloric effect can be obtained efficiently.

  Further, the Curie point of the MCM may change due to, for example, a difference in performance between lots of the MCM. In such a case, the continuity of the temperature gradient generated in the cascade-connected MCMs may not be sufficient.

  On the other hand, in the present embodiment, the first and second aggregates 11A and 11B in which the first wire 121 and the second wire 122 are mixed are used as the third aggregate 11C and the fourth aggregate 11D. It is interposed between. Thereby, a continuous temperature gradient can be easily generated in the first MCM heat exchanger 10.

  Further, in the present embodiment, as the first opening 131 approaches the second opening 132, the third aggregate 11C, the first aggregate 11A, the second aggregate 11B, and the fourth aggregate The first to fourth aggregates 11A to 11D are arranged in the order of 11D.

That is, in this embodiment, the number (N ₁ ) of the first wire rods 121 as the wire rods constituting the first to fourth stranded wires 12A to 12D as the first opening 131 approaches the second opening 132. The first to fourth aggregates 11A to 11D are arranged so that the ratio (N ₁ : N ₂ ) of the number (N ₂ ) of the first and second wire rods 122 changes stepwise. For this reason, the temperature gradient which generate | occur | produces in the 1st MCM heat exchanger 10 can be made smooth.

Further, in the present embodiment, the first and second wire rods 121 and 122 having different Curie points T _C1 and T _C2 are twisted to constitute the first stranded wire 12A, and a plurality of first stranded wires. The first aggregate 11A is configured by bundling a plurality of 12A. Similarly, the 1st and 2nd wire 121,122 is twisted together, the 2nd strand 12B is comprised, and the 2nd aggregate 11B is comprised by bundling a plurality of 2nd strands 12B. Yes.

  For this reason, as shown to Fig.5 (a) and FIG.6 (a), in the 1st and 2nd aggregate | assembly 11A, 11B, the 1st wire 121 is arrange | positioned substantially equally without biasing. At the same time, since the second wire rods 122 are also arranged substantially uniformly without being biased, the temperature distribution in the cross section orthogonal to the longitudinal direction in the first MCM heat exchanger 20 can be made uniform.

  The second MCM heat exchanger 20 can obtain the same effects as those of the first MCM heat exchanger 10 described above.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  The configuration of the magnetic heat pump device described above is an example, and the heat exchanger according to the present invention may be applied to other magnetic heat pump devices of an AMR (Active Magnetic Refrigerataion) system.

  For example, the number of MCM heat exchangers included in the magnetic heat pump device is not particularly limited. For example, the magnetic heat pump device may include one or three or more MCM heat exchangers.

  Moreover, although the above-mentioned embodiment demonstrated the example which applied the magnetic heat pump apparatus to air conditioners, such as home use or a motor vehicle, it is not specifically limited to this. For example, by selecting an MCM having an appropriate Curie temperature according to the application, the magnetic heat pump device according to the present invention can be applied to an application in a cryogenic temperature region such as a refrigerator or an application in a certain high temperature region. May be.

  Moreover, in this embodiment, although the 1st and 2nd MCM heat exchangers 10 and 20 have the same structure, it is not limited to this in particular, These may have a different structure. For example, the first and second MCM heat exchangers 10 and 20 may use aggregates with different specifications or may have different numbers of aggregates.

DESCRIPTION OF SYMBOLS 1 ... Magnetic heat pump apparatus 10 ... 1st MCM heat exchanger 11A-11D ... 1st-4th aggregate 12A-12D ... 1st-4th twisted wire 121 ... 1st wire 122 ... 2nd wire 123 ... Flow path 13 ... Container 131 ... First opening 132 ... Second opening 14 ... Accommodating portion 141 bottom 142,143 ... side
144 ... Opening 15 ... Lid 16 ... 1st terminal member 161 ... Connection port 162 ... Connection port 17 ... 2nd terminal member 171 ... Connection port 172 ... Connection port 20 ... 2nd MCM heat exchanger 21A-21D ... 1st-4th aggregate | assembly 23 ... Container 261 ... 1st connection port 271 ... 2nd connection port 30 ... Piston 35 ... Actuator 40 ... Permanent magnet 50 ... Low temperature side heat exchanger 60 ... High temperature side heat exchanger 70 ... Pumps 81-82 ... First to second low temperature side pipes 83-84 ... Third to fourth high temperature side pipes 90 ... Switching valve

Claims (6)

A first assembly configured by bundling a plurality of first strands;
A container in which the first assembly is accommodated,
Each of the first stranded wires is formed by twisting a plurality of wires together,
The plurality of wires are
A first wire composed of a first magnetocaloric material having a first Curie point;
And a second wire composed of a second magnetocaloric material having a second Curie point different from the first Curie point. The heat exchanger according to claim 1,
The container is
A first opening located at one end;
A second opening located at the other end,
A heat exchanger in which a first direction from the first opening toward the second opening is substantially parallel to an extending direction of the first assembly. The heat exchanger according to claim 2,
The heat exchanger includes a second aggregate configured by bundling a plurality of second stranded wires,
Each of the second stranded wires is formed by twisting the wires together.
The second assembly is accommodated in the container so as to be positioned on the second opening side with respect to the first assembly along the first direction,
The first ratio is a ratio between the number of the first wires constituting the first stranded wire and the number of the second wires.
The second ratio is a ratio between the number of the first wires constituting the second stranded wire and the number of the second wires,
A heat exchanger in which the first ratio and the second ratio are different from each other. The heat exchanger according to claim 3,
The number of the first wires constituting the first stranded wire is relatively large with respect to the number of the first wires constituting the second stranded wire,
The number of the 2nd wire which constitutes the 1st twisted wire is a heat exchanger relatively few with respect to the number of the 2nd wire which constitutes the 2nd twisted wire. The heat exchanger according to claim 4,
The heat exchanger is
A third aggregate configured by bundling a plurality of third stranded wires;
A fourth assembly configured by bundling a plurality of fourth stranded wires,
The third stranded wire is formed by twisting a plurality of the first wire rods,
The fourth stranded wire is formed by twisting a plurality of the second wire rods,
The third assembly is accommodated in the container so as to be positioned on the first opening side with respect to the first assembly in the first direction,
The heat exchanger housed in the container so that the fourth aggregate is positioned on the second opening side with respect to the second aggregate in the first direction. At least one heat exchanger according to any one of claims 1 to 5;
Magnetic field changing means for applying a magnetic field to the wire and changing the magnitude of the magnetic field;
First and second external heat exchangers respectively connected to the heat exchanger via piping;
Fluid supply for supplying fluid from the heat exchanger to the first external heat exchanger or the second external heat exchanger in accordance with a change in the magnitude of the magnetic field applied to the wire by the magnetic change means And a magnetic heat pump device.

Images