JP2020071007A - Heat exchanger and magnetic heat pump device - Google Patents

Abstract

To provide a heat exchanger which can inhibit reduction of heat absorption and generation amounts of a magneto-caloric effect material while achieving improvement of heat exchange efficiency.SOLUTION: A heat exchanger 10 used in a magnetic heat pump device 1 including a pair of magnets 41, 42 includes: a cylindrical case 12 which houses a magneto-caloric effect material 11; and ferromagnetic bodies 20, 30 which are attached so as to contact with an outer peripheral surface of the case 12. The ferromagnetic materials 20, 30 respectively have a first facing surface 22 which extends along a surface of one of the magnet 41 and a second facing surface 32 which extends along a surface of the other magnet 42.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat exchanger used in a magnetic heat pump device that utilizes a magnetocaloric effect, and a magnetic heat pump device including the heat exchanger.

  As a heat exchanger used in a magnetic heat pump device, there is known one in which a magnetocaloric effect material is housed in a cylindrical case (see, for example, Patent Document 1).

International Publication No. 2016/204294

  In the above heat exchanger, the case has a cylindrical shape, and the flow velocity distribution of the fluid in the case is made uniform to improve the heat exchange efficiency.

  On the other hand, in the magnetic heat pump device, the heat exchanger is relatively reciprocated between the pair of magnets, whereby the application / removal of the magnetic field is repeated with respect to the magnetocaloric effect material. At this time, if the case is cylindrical like the above heat exchanger, a relatively wide space is formed between the magnet and the case, the magnetic flux density is reduced by the space, and the heat absorption and heat generation of the magnetocaloric effect material. There is a problem that the amount decreases.

  A problem to be solved by the present invention is to provide a heat exchanger capable of suppressing a decrease in the amount of heat absorbed and generated by a magnetocaloric effect material while improving heat exchange efficiency, and a magnetic heat pump device including the heat exchanger. Is to provide.

  [1] A heat exchanger according to the present invention is a heat exchanger used in a magnetic heat pump device including a pair of magnets, and includes a cylindrical case accommodating a magnetocaloric effect material and an outer peripheral surface of the case. A ferromagnetic body mounted so as to be in contact with each other, wherein the ferromagnetic body has a first facing surface extending along the surface of one of the magnets and a second facing surface of the other magnet. A second opposing surface that extends and a heat exchanger having a second opposing surface.

  [2] In the above invention, the ferromagnetic body may be divided so as to be separated from the first facing surface side and the second facing surface side around the case.

  [3] In the above invention, the end face of the ferromagnetic material may overlap the magnetocaloric effect material when seen through from one of the magnets to the other magnet.

  [4] In the above invention, the ferromagnetic body is divided into four parts, centering on the case, including two parts on the first facing surface side and two parts on the second facing surface side. It may have been done.

  [5] A magnetic heat pump device according to the present invention includes the heat exchanger described above and a pair of the magnets, and applies a magnetic field to the magnetocaloric effect material and changes the magnitude of the magnetic field. The heat exchanger is a magnetic heat pump device interposed between the pair of magnets when a magnetic field is applied to at least the magnetocaloric effect material.

  [6] In the above invention, the magnetic heat pump device applies first and second external heat exchangers, which are respectively connected to the heat exchanger via a pipe, to the magnetocaloric effect material by the magnetic field applying device. A fluid supply device that supplies a fluid from the heat exchanger to the first external heat exchanger or the second external heat exchanger according to a change in the magnitude of the magnetic field to be performed.

  According to the present invention, since the ferromagnetic substance exists in the space formed between the cylindrical container and the pair of magnets, the heat absorption efficiency of the magnetocaloric effect material is improved while the heat exchange efficiency is improved. Can be suppressed.

FIG. 1 is a diagram showing an overall configuration of a magnetic heat pump device according to an embodiment of the present invention, and is a diagram showing a state in which a magnet is in a first position. FIG. 2 is a diagram showing an overall configuration of the magnetic heat pump device according to the embodiment of the present invention, and is a diagram showing a state in which the magnet is at the second position. FIG. 3 is an exploded perspective view showing the MCM heat exchanger according to the embodiment of the present invention. FIG. 4 is a view showing the MCM heat exchanger according to the embodiment of the present invention, which is a sectional view taken along line IV-IV of FIG. FIG. 5: is sectional drawing which shows the 1st modification of MCM heat exchange in embodiment of this invention. FIG. 6 is a sectional view showing a second modification of the MCM heat exchanger according to the embodiment of the present invention.

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

  1 and 2 are views showing the overall configuration of a magnetic heat pump device according to this embodiment, and FIGS. 3 and 4 are an exploded perspective view and a cross-sectional view showing an MCM heat exchanger according to this embodiment.

  The magnetic heat pump device 1 in the present embodiment is a heat pump device that utilizes the magnetocaloric effect. As shown in FIGS. 1 and 2, the magnetic heat pump device 1 includes an MCM heat exchanger 10, a magnetic field applying device 40, a high temperature side heat exchanger 51, a low temperature side heat exchanger 52, and a pump device 60. , And pipes 91 to 94.

  The MCM heat exchanger 10 in the present embodiment corresponds to an example of the heat exchanger in the present invention, the magnetic field applying device 40 in the present embodiment corresponds to an example of the magnetic field applying device in the present invention, and the magnetic heat pump device in the present embodiment. 1 corresponds to an example of the magnetic heat pump device in the present invention. Further, the high temperature side heat exchanger 51 and the low temperature side heat exchanger 52 in the present embodiment correspond to an example of the external heat exchanger in the present invention, and the pump device 60 in the present embodiment serves as an example of the fluid supply device in the present invention. Equivalent to.

  As shown in FIGS. 3 and 4, the MCM heat exchanger 10 includes a magnetocaloric effect material (MCM) having a magnetocaloric effect, a case 12 (container) for housing the MCM 11, and a case 12. And two ferromagnetic bodies 20 and 30 mounted on the outer peripheral surface of the.

  When a magnetic field is applied to the MCM 11, the electron spins are aligned and the magnetic field entropy decreases, and the temperature of the MCM 11 rises and heat is generated. On the other hand, when the magnetic field is removed from the MCM 11, the electron spins become disordered, the magnetic entropy increases, and the MCM 11 lowers the temperature and absorbs heat.

  The MCM 11 is not particularly limited as long as it is a magnetic material. For example, the MCM 11 is a magnetic material that has a Curie temperature (Curie point) in a normal temperature range of about 10 ° C. to 30 ° C. and exhibits a high magnetocaloric effect in the normal temperature range. Preferably. Specific examples of such an MCM include gadolinium (Gd), gadolinium alloy, and lanthanum-iron-silicon (La-Fe-Si) compounds.

  The shape of the MCM 11 is not particularly limited, and examples thereof include linear, mesh, granular, and plate shapes. An assembly formed by twisting a plurality of wires together may be housed in the case. Alternatively, an individual twisted wire may be formed by twisting several wire rods, and the plurality of twisted wires may be bundled together to form an aggregate.

  As shown in FIGS. 3 and 4, the case 12 has a cylindrical shape, and the MCM 11 described above is filled inside the case 12. The case 12 is made of a resin material such as ABS resin, that is, the case 12 is a non-magnetic material. A connection member 121 is attached to one end of the case 12, and a first pipe 91 is connected to a connection port 121a of the connection member 121 (see FIGS. 1 and 2). Similarly, the connection member 122 is attached to the other end of the case 12, and the second pipe 92 is connected to the connection port 122a of the connection member 122 (see FIGS. 1 and 2).

  The first and second ferromagnetic bodies 20 and 30 are mounted on the outer peripheral surface of the case 12, and when the magnetic field is applied to the MCM 11 by the magnetic field applying apparatus 40, the magnets 41 and 42 of the magnetic field applying apparatus 40. And the case 12. The first and second ferromagnetic bodies 20 and 30 mounted on the outer peripheral surface of the case 12 are separated from each other. The first and second ferromagnetic bodies 20 and 30 in the present embodiment correspond to an example of the ferromagnetic body in the present invention, and the first and second magnets 41 and 42 in the present embodiment correspond to the present invention. It corresponds to an example of a pair of magnets.

  The first ferromagnetic body 20 has a first inner side surface 21, a first facing surface 22, and a pair of first end surfaces 23, and has a substantially U-shaped cross-sectional shape as a whole. is doing.

  The first inner side surface 21 constitutes a lower surface of the first ferromagnetic body 20. The first inner side surface 21 is a curved surface having a semicircular cross section corresponding to the outer peripheral surface of the upper half of the case 12, and is in contact with the outer peripheral surface of the case 12. The first ferromagnetic body 20 is attached to the case 12 on the first inner side surface 21 using an adhesive or the like, and is in contact with the outer peripheral surface of the case 12.

  The first facing surface 22 constitutes an upper surface of the first ferromagnetic body 20. The first facing surface 22 is an outer surface facing the first magnet 41 when a magnetic field is applied to the MCM 11 by the magnetic field applying device 40. The first facing surface 22 is a flat flat surface that extends substantially parallel to the main surface 411 of the first magnet 41, and extends along the main surface 411 of the first magnet 41. ing. The first ferromagnetic body 20 is interposed between the case 12 and the first magnet 41 so that the first facing surface 22 extends at a distance from the first magnet 41.

  The first end surface 23 constitutes a side surface of the first ferromagnetic body 20. The lower end of the first end surface 23 is connected to the first inner side surface 21, and the upper end of the first end surface 23 is connected to the first facing surface 22. In the present embodiment, the position of the first end surface 23 is the case 12 when viewed from the first magnet 41 toward the second magnet 42 (when viewed along the Z direction in FIG. 4). It does not overlap with MCM11.

  The second ferromagnetic body 30 also has a second inner side surface 31, a second facing surface 32, and a second end surface 33, and has a substantially U-shaped cross section as a whole. ing.

  The second inner side surface 31 constitutes the upper surface of the second ferromagnetic body 30. The second inner side surface 31 is a curved surface having a semicircular cross section corresponding to the outer peripheral surface of the lower half of the case 12, and is in contact with the outer peripheral surface of the case 12. The second ferromagnetic body 30 is attached to the case 12 on the second inner side surface 31 with an adhesive or the like, and is in contact with the outer peripheral surface of the case 12.

  The second facing surface 32 constitutes the lower surface of the second ferromagnetic body 30. The second facing surface 32 is an outer surface facing the second magnet 42 when a magnetic field is applied to the MCM 11 by the magnetic field applying device 40. The second facing surface 32 is a flat plane extending substantially parallel to the main surface 421 of the second magnet 42, and extends along the main surface 421 of the second magnet 42. ing. The second ferromagnetic body 30 is interposed between the case 12 and the second magnet 42 so that the second facing surface 32 extends at a distance from the second magnet 44.

  The second end surface 33 constitutes a side surface of the second ferromagnetic body 30. The upper end of the second end surface 33 is connected to the second inner side surface 31, and the lower end of the second end surface 33 is connected to the second facing surface 32. In the present embodiment, the position of the second end surface 33 is the case 12 when viewed from the first magnet 41 toward the second magnet 42 (when viewed along the Z direction in FIG. 4). It does not overlap with MCM11.

  The first and second ferromagnetic bodies 20 and 30 are made of an Fe-based ferromagnetic material containing Fe as a main component. The ferromagnetic materials forming the first and second ferromagnetic bodies 20 and 30 are, for example, Fe, such as Fe—Co alloy, Fe—Ni alloy, Fe—Co—Ni alloy, and Fe—N alloy. You may comprise with the metal material which contains 1 or more types chosen from Co and Ni as a main component. At this time, if the ferromagnetic materials forming the first and second ferromagnetic bodies 20 and 30 are metals containing Fe, Co, Ni or the like as a main component, the characteristics as the ferromagnetic material are not impaired. Other subcomponents (other metals, carbon, nitrogen, etc.) may be included in the above.

  FIG. 5 is a sectional view showing a first modification of the MCM heat exchanger according to this embodiment, and FIG. 6 is a sectional view showing a second modification of the MCM heat exchanger according to this embodiment.

As shown in FIG. 5, the thickness of the first ferromagnetic body in the Z direction is reduced to divide the first ferromagnetic body into two parts 20a and 20b, and at the same time, The second ferromagnetic body may be divided into two portions 30a and 30b by reducing the thickness in the Z direction. That is, the ferromagnetic material surrounding the case 12 may be composed of four parts 20a, 20b, 30a, 30b that are divided into four parts with the case 12 as the center. As a result, the MCM 11 can be arranged near the first magnets 41, 42 by the distance D ₁ (see FIG. 4).

  In the example shown in FIG. 5, the first inner side surface 21a of the one first ferromagnetic body 20a is a curved surface corresponding to the outer peripheral surface of the upper left half of the case 12, and the first ferromagnetic body 20a. The first facing surface 22a of is a plane facing the left half of the main surface 411 of the first magnet 41. On the other hand, the first inner side surface 21b of the other second ferromagnetic body 20b is a curved surface corresponding to the outer peripheral surface of the upper right half of the case 12, and the first inner side surface 21b of the first ferromagnetic body 20b is the first inner side surface 21b. The facing surface 22b is a flat surface facing the right half of the main surface 411 of the first magnet 41.

  Similarly, the second inner side surface 31a of the one second ferromagnetic body 30a is a curved surface corresponding to the outer peripheral surface of the lower left half of the case 12, and the second facing surface of the second ferromagnetic body 30a faces the second opposite side surface 31a. The surface 32 a is a flat surface that faces the left half of the main surface 421 of the second magnet 42. On the other hand, the second inner side surface 31b of the other second ferromagnetic body 30b is a curved surface corresponding to the outer peripheral surface of the lower right half of the case 12, and the second inner side surface 31b of the second ferromagnetic body 30b is the second curved surface. The facing surface 32b is a flat surface facing the right half of the main surface 421 of the second magnet 42.

  Further, as shown in FIG. 6, the thickness of the first ferromagnetic body in the Z direction is reduced to divide it into two parts 20a and 20b, and the thickness of the second ferromagnetic body in the Z direction is reduced. In addition to dividing into the two portions 30a and 30b, the first and second ferromagnetic bodies 20a, 20b, 30a and 30b may be configured as follows.

  That is, when seen through from the first magnet 41 to the second magnet 42 (when viewed along the Z direction in FIG. 6), the end face 23 a of the first ferromagnetic body 20 a and the second strong magnet 20 a. The end surface 33a of the magnetic body 30a may overlap with one end 111 of the MCM 11. Similarly, the end surface 23b of the first ferromagnetic body 20b and the end surface 33b of the second ferromagnetic body 30b may overlap the other end portion 112 of the MCM 11.

In other words, the end surfaces 23a and 33a of the ferromagnetic bodies 20a and 30a and the one end portion 111 of the MCM 11 may be located on the virtual straight line VL ₁ extending in the Z direction in FIG. Similarly, on the virtual straight line VL ₂ which extends in the Z direction in 5, ferromagnetic 20b, the end face 23b of 30b, and 33b, may be located and the other end 112 of the MCM11.

  Although not shown in particular, when viewed from the first magnet 41 toward the second magnet 42, the end faces 23a and 33a of the ferromagnetic bodies 20a and 30a are portions slightly inside the end portion 111 in the MCM 11. May overlap with. Similarly, the end faces 23b and 33b of the ferromagnetic bodies 20b and 30b may overlap a portion slightly inside the end portion 112 in the MCM 11.

  As shown in FIGS. 1 and 2, the magnetic field applying device 40 includes a pair of magnets 41 and 42, a yoke 43 that supports the magnets 41 and 42, a support member 44 fixed to the yoke 43, and a support member 44. An actuator 45 that reciprocates the magnets 41 and 42 via the magnet.

  As shown in FIG. 4, the pair of magnets 41, 42 are substantially plate-shaped permanent magnets, and have flat main surfaces 411, 421 extending in the XY plane direction, respectively. The yoke 43 has a substantially U shape and holds the pair of magnets 41 and 42 so as to face each other. The yoke 43 is made of the same ferromagnetic material as the first and second ferromagnetic bodies 20 and 30 described above. The actuator 45 is capable of reciprocating the magnets 41 and 42 along the Y direction. As a specific example of the actuator 45, an air cylinder or the like can be exemplified.

  The pair of magnets 41, 42 is separated from the MCM heat exchanger 10 by the actuator 45 (the MCM heat exchanger 10 is not sandwiched) “first position” (state shown in FIG. 1) and the MCM heat exchanger 10 It is possible to reciprocate between the "second position" (the state shown in FIG. 2) sandwiching the.

  When the magnets 41, 42 move to the “first position”, the MCM 11 of the MCM heat exchanger 10 is demagnetized and the MCM 11 absorbs heat. At the “first position”, the facing surfaces 22 and 32 of the ferromagnetic bodies 20 and 30 do not face the main surfaces 411 and 421 of the magnets 41 and 42. On the other hand, when the magnets 41 and 42 move to the "second position", the MCM 11 of the MCM heat exchanger 10 is excited and the MCM 11 generates heat. At the “second position”, the facing surfaces 22 and 32 of the ferromagnetic bodies 20 and 30 face the main surfaces 411 and 421 of the magnets 41 and 42.

  The pair of magnets 41, 42 may be electromagnets instead of the permanent magnets. If the magnets 41, 42 are electromagnets, the actuator 45 may be omitted. Further, when the magnets 41 and 42 are electromagnets, the magnitude of the magnetic field applied to the MCM 11 may be changed instead of applying / removing the magnetic field to / from the MCM 11. Incidentally, when the magnets 41 and 42 are electromagnets and the magnetic field applying device 40 does not include the actuator 45, the ferromagnetic bodies 20 and 30 are always opposed to the magnets 41 and 42.

  As shown in FIGS. 1 and 2, the other end of the first pipe 91 is connected to the first port 511 of the high temperature side heat exchanger 51, and the high temperature side heat exchanger 51 includes the first port 511. It is connected to the MCM heat exchanger 10 via the pipe 91. On the other hand, one end of a third pipe 93 is connected to the second port 512 of the high temperature side heat exchanger 51, and the other end of the third pipe 93 is one reciprocating end of the pump device 60. It is connected to the pump 71.

  The other end of the second pipe 92 is connected to the first port 521 of the low temperature side heat exchanger 52, and the low temperature side heat exchanger 52 passes through the second pipe 92 to exchange MCM heat. Connected to the container 10. On the other hand, one end of a fourth pipe 94 is connected to the second port 522 of the low temperature side heat exchanger 52, and the other end of the fourth pipe 94 is the other reciprocating motion of the pump device 60. It is connected to the pump 72.

  For example, when the air conditioner using the magnetic heat pump device 1 according to the present embodiment is caused to function as air conditioning, heat is exchanged between the low temperature side heat exchanger 52 and the air in the room to cool the room, By exchanging heat between the high temperature side heat exchanger 51 and the outside, heat is radiated outside.

  On the other hand, when the air conditioner is to function as heating, the room is warmed by exchanging heat between the high temperature side heat exchanger 51 and the indoor air, and the low temperature side heat exchanger 52 and the outdoor side. Heat is absorbed from outside by exchanging heat with the air.

  The heat transporting liquid CL is pressure-fed by the pump device 60 in the piping system including the heat exchangers 10, 51, 52 and the pipings 91 to 94 described above. Specific examples of the heat transport liquid CL include liquids such as water, antifreeze liquid, ethanol solution, or a mixture thereof. The heat transport liquid CL in the present embodiment corresponds to an example of the liquid in the present invention.

  As shown in FIGS. 1 and 2, the pump device 60 in the present embodiment includes a pair of reciprocating pumps 71 and 72 and an actuator 80 that drives the reciprocating pumps 71 and 72. One reciprocating pump 71 pumps the heat-transporting liquid CL from the MCM heat exchanger 10 toward the low temperature side heat exchanger 52, while the other reciprocating pump 72 moves from the MCM heat exchanger 10 to the high temperature side heat exchange. The heat-transporting liquid CL is pressure-fed toward the container 51.

  One reciprocating pump 71 includes a cylindrical cylinder 711 and a plunger 712 capable of reciprocating in the cylinder 711, and the third pipe 93 is connected to the connection port 711 a of the cylinder 711. ing. That is, the reciprocating pump 71 is connected to the MCM heat exchanger 10 via the third pipe 93, the high temperature side heat exchanger 51, and the first pipe 91.

  The other reciprocating pump 72 also includes a cylindrical cylinder 721 and a plunger 722 capable of reciprocating in the cylinder 721, and the fourth pipe 94 is connected to the connecting port 721a of the cylinder 721. ing. That is, the reciprocating pump 72 is connected to the MCM heat exchanger 10 via the fourth pipe 94, the low temperature side heat exchanger 52, and the second pipe 92.

  As shown in FIGS. 1 and 2, the reciprocating pumps 71 and 72 are connected by a connecting member 81 at the rear end portions of the plungers 712 and 722, and the two plungers 712 and 722 face in opposite directions to each other. There is. The connecting member 81 is connected to the actuator 80, and the two plungers 712 and 722 can be reciprocated by the single actuator 80. As a specific example of the actuator 80, an air cylinder or the like can be exemplified.

  The operation of the actuator 80 of the pump device 60 is synchronized with the operation of the actuator 45 of the magnetic field applying device 40 described above under the control of the control device (not shown). Specifically, the operation of the actuator 80 causes the plunger 712 of the one reciprocating pump 71 to move forward and the plunger 722 of the other reciprocating pump 72 to move backward at the “first position” shown in FIG. On the other hand, in the “second position” shown in FIG. 2, the plunger 712 of the one reciprocating pump 71 retracts and the plunger 722 of the other reciprocating pump 72 advances.

  Next, the operation of the magnetic heat pump device 1 according to this embodiment will be described with reference to FIGS. 1 and 2.

  First, the actuator 45 of the magnetic field applying device 40 is driven to move the pair of magnets 41 and 42 from the “second position” to the “first position”. As a result, the MCM heat exchanger 10 does not face the magnets 41, 42, so that the MCM 11 in the MCM heat exchanger 10 is demagnetized, and the temperature of the MCM 11 drops.

  At the same time, the actuator 80 of the pump device 60 is driven to move the plunger 712 of the one reciprocating pump 71 forward in the cylinder 711 and move the plunger 722 of the other reciprocating pump 72 backward in the cylinder 721. As a result, the heat-transporting liquid CL moves from the high-temperature side heat exchanger 51 toward the low-temperature side heat exchanger 52, and the heat-transporting liquid CL has its temperature lowered when passing through the MCM heat exchanger 10. Cooled by.

  Then, as shown in FIG. 2, the actuator 45 of the magnetic field applying device 40 moves the pair of magnets 41 and 42 from the “first position” to the “second position”. As a result, the MCM heat exchanger 10 is sandwiched between the magnets 41 and 42, the MCM 11 is excited, and the temperature of the MCM 11 rises.

  At the same time, the actuator 80 of the pump device 40 causes the plunger 712 of the one reciprocating pump 71 to retreat within the cylinder 711 and causes the plunger 722 of the other reciprocating pump 72 to advance within the cylinder 721. As a result, the heat-transporting liquid CL moves from the low-temperature side heat exchanger 52 toward the high-temperature side heat exchanger 51, and when the heat-transporting liquid CL passes through the MCM heat exchanger 10, the temperature of the MCM 11 increases. Heated by.

  Then, the reciprocating movement of the magnets 41, 42 and the plungers 712, 722 described above between the “first position” and the “second position” is repeated to apply the magnetic field to the MCM 11 in the MCM heat exchanger 10. By repeating the / removal, the heating of the high temperature side heat exchanger 51 and the cooling of the low temperature side heat exchanger 52 are continued.

  As described above, in the present embodiment, the case 12 of the MCM heat exchanger 10 has a cylindrical shape, and the flow velocity distribution of the heat transport liquid CL in the case 12 is made uniform, so that the heat exchange efficiency is improved. Are better. Incidentally, when the case has a rectangular cross-sectional shape, it becomes difficult for the refrigerant to flow at the corners, so that the flow velocity distribution of the heat-transporting liquid in the case becomes uneven.

  Further, in this embodiment, the first and second ferromagnetic bodies 20 and 30 are present in the space formed between the cylindrical case 12 and the magnets 41 and 42. The ferromagnetic bodies 20 and 30 have higher magnetic permeability than the air, the case 12, and the MCM 11. Therefore, the space with low magnetic permeability formed between the magnets 41 and 42 and the case 12 can be minimized without changing the shape of the case 12, and the magnetic flux density in the MCM 11 can be increased. It is possible to suppress a decrease in the amount of heat absorbed and generated by the magnetocaloric effect material.

  That is, in the present embodiment, by making the shape of the case 12 of the MCM heat exchanger 10 cylindrical, the heat exchange efficiency is improved and the ferromagnetic bodies 20, 30 are provided between the case 12 and the magnets 41, 42. By intervening, it is possible to suppress a decrease in the amount of heat generated and absorbed by the MCM 11.

In the example shown in FIG. 5, the ferromagnetic material is divided into four parts 20a, 20b, 30a, 30b so that the MCM 11 is arranged near the magnets 41, 42 by the distance D ₁ (see FIG. 4). You can The magnets 41, 42 have higher magnetic permeability than the ferromagnetic bodies 20a, 20b, 30a, 30b. Therefore, the magnetic flux density in the MCM 11 can be further increased.

  Further, in the example shown in FIG. 6, the end faces 23a and 33a of the ferromagnetic bodies 20a and 30a overlap the end portion 111 of the MCM 11, and the end faces 23b and 33b of the ferromagnetic bodies 20b and 30b form the end portion 112 of the MCM 11. By making them overlap, the magnetic flux that does not pass through the MCM 11 can be reduced. Therefore, the magnetic flux density in the MCM 11 can be further increased.

  The embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above-described embodiments is intended to include all design changes and equivalents within the technical scope of the present invention.

  For example, in the above-described embodiment, the ferromagnetic material is divided into two or four with the case 12 as the center, but the structure of the ferromagnetic material is not particularly limited to this. For example, a through hole may be formed in a single undivided ferromagnetic material, and the case 12 may be inserted into the through hole.

  Further, in the magnetic heat pump device 1 described above, the magnets 41 and 42 are reciprocally moved with respect to the MCM heat exchanger 10 by the actuator 45 of the magnetism applying device 40. However, the MCM heat exchanger 10 moves with respect to the magnets 41 and 42. The relative movement is not limited to this. For example, the MCM heat exchanger 10 may be reciprocated by the actuator without moving the magnets 41 and 42.

  The configuration of the magnetic heat pump device described above is an example, and the MCM heat exchanger 10 described above may be applied to an AMR (Active Magnetic Refrigerataion) type magnetic heat pump device having another configuration.

  Furthermore, in the above-described embodiment, an example in which the magnetic heat pump device is applied to an air conditioner for homes or automobiles has been described, but the present invention is not 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 is applied to an application in an extremely low temperature range such as a refrigerator or an application in a high temperature range to some extent. You may.

DESCRIPTION OF SYMBOLS 1 ... Magnetic heat pump apparatus 10 ... MCM heat exchanger 11 ... Magneto-caloric effect material 111,112 ... End part 12 ... Case 121,122 ... Connection member 121a, 122a ... Connection port 20,20a, 20b ... 1st ferromagnetic body 21, 21a, 21b ... First inner side surface 22, 22a, 22b ... First opposing surface 23, 23a, 23b ... First end surface 30, 30a, 30b ... Second ferromagnetic body 31, 31a, 31b ... Second inner side surface 32, 32a, 32b ... Second opposing surface 33, 33a, 33b ... Second end surface 40 ... Magnetic field applying device 41 ... First magnet 411 ... Main surface 42 ... Second magnet 421 ... Main Surface 43 ... Yoke 44 ... Supporting member 45 ... Actuator 51 ... High temperature side heat exchanger 511, 512 ... Port 52 ... Low temperature side heat exchanger 521, 522 ... Port 60 ... Pump device 71, 7 2 ... Reciprocating pump 711, 721 ... Cylinder 711a, 721a ... Connection port 712, 722 ... Plunger 80 ... Actuator 81 ... Connection member 82 ... Support member 91-94 ... 1st-4th piping CL ... Heat transport liquid

Claims (6)

A heat exchanger used in a magnetic heat pump device comprising a pair of magnets,
A cylindrical case containing a magnetocaloric effect material,
A ferromagnetic material mounted so as to contact the outer peripheral surface of the case,
The ferromagnetic material is
A first facing surface extending along the surface of one of the magnets;
A second facing surface extending along the surface of the other magnet, and a heat exchanger having the second facing surface. The heat exchanger according to claim 1, wherein
The heat exchanger in which the ferromagnetic body is divided so as to be separated from the first facing surface side and the second facing surface side with the case as a center. The heat exchanger according to claim 1 or 2, wherein
A heat exchanger in which an end surface of the ferromagnetic material overlaps with the magnetocaloric effect material when seen through from the one magnet toward the other magnet. The heat exchanger according to any one of claims 1 to 3,
The heat exchanger, wherein the ferromagnetic body is divided into four parts, centering on the case, including two parts on the first facing surface side and two parts on the second facing surface side. The heat exchanger according to any one of claims 1 to 4,
A pair of the magnets, a magnetic field applying device for applying a magnetic field to the magnetocaloric effect material and changing the magnitude of the magnetic field, and
The heat exchanger is a magnetic heat pump device interposed between a pair of the magnets when a magnetic field is applied to at least the magnetocaloric effect material. The magnetic heat pump device according to claim 5, wherein
The magnetic heat pump device,
First and second external heat exchangers respectively connected to the heat exchanger via piping,
A fluid is supplied 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 magnetocaloric effect material by the magnetic field applying device. And a magnetic heat pump device including the fluid supply device.

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