JP2018080854A - Magnetic heat pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic heat pump device capable of improving change of a magnetic field applied to a magnetic working material and timing of reciprocative motion of heat medium, to improve efficiency.SOLUTION: A magnetic heat pump device includes: a magnetic work material 13 having a magnetic heat quantity effect; magnetic work bodies 11A, 11B through which heat medium circulates; a permanent magnet 6 configured to change a magnetic field applied to the magnetic work material; and a displacer 8 configured to reciprocatively move the heat medium between a high-temperature end 14 and a low-temperature end 16 of the magnetic work body. Before with the displacer 8, the permanent 6 increases the magnetic field applied to the magnetic work material, the heat medium is moved from the low-temperature end side to the high-temperature end side of the magnetic work body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic heat pump device using the magnetocaloric effect of a magnetic working substance.

  Instead of conventional vapor compression refrigeration equipment using a gas refrigerant such as chlorofluorocarbon, a magnetic heat pump device using a property (magnetocaloric effect) that causes a large temperature change when a magnetic working material is excited and demagnetized has been attracting attention in recent years. Yes.

  Conventionally, in this type of magnetic heat pump apparatus, a magnetic working material is filled in a duct of a magnetic working body, and a permanent magnet is separated from and attached to the magnetic working body, thereby changing a magnetic field applied to the magnetic working material. At this time, when the applied magnetic field is increased (excited), the temperature of the magnetic working substance increases, and when it is decreased (demagnetized), the temperature decreases.

  On the other hand, the heat medium (water) is reciprocated between the high temperature end and the low temperature end of the magnetic working body using a displacer (piston), a heat medium moving device including a pump and a rotary valve. In this case, the magnetic working material is excited, the temperature is increased, and the heat medium is moved from the low temperature end side to the high temperature end side. Let As a result, the magnetic working body has a temperature gradient that is high on the high temperature end side and low on the low temperature end side.

  Next, when the magnetic working material is demagnetized, its temperature decreases.However, by moving the heat medium from the high temperature end side to the low temperature end side, the magnetic working material whose temperature has been decreased by demagnetization and the high temperature heat medium are heated. Let them exchange. Thereby, the temperature gradient of the magnetic working body is further expanded.

  In this way, the temperature change caused by the magnetocaloric effect is stored in the magnetic working body itself, and is efficiently taken out by the heat medium at the low temperature end side and the high temperature end side, thereby absorbing heat (freezing) with an external heat exchanger. And heat radiation (heating) (for example, see Patent Document 1).

JP 2008-51409 A

  However, since the heat medium is moved from the low-temperature end side to the high-temperature end side simultaneously with the excitation of the magnetic working substance, and is moved from the high-temperature end side to the low-temperature end side simultaneously with demagnetization, before the sufficient heat exchange is performed. The heat medium (water) flows out, heat exchange between the magnetic working material and the heat medium becomes insufficient, and the temperature change due to the magnetocaloric effect of the magnetic working material cannot be used effectively.

  The present invention has been made in order to solve the conventional technical problem, and it is possible to improve the efficiency by changing the magnitude of the magnetic field applied to the magnetic working material and improving the timing of the reciprocating movement of the heat medium. It is an object of the present invention to provide an improved magnetic heat pump device.

  A magnetic heat pump device according to a first aspect of the present invention includes a magnetic working material having a magnetocaloric effect, a magnetic working body through which a heat medium is circulated, and a magnetic field changing device that changes the magnitude of a magnetic field applied to the magnetic working material. A heat medium moving device for reciprocating the heat medium between the high temperature end and the low temperature end of the magnetic working body, a heat dissipating heat exchanger for dissipating the heat medium on the high temperature end side, and heat on the low temperature end side An endothermic heat exchanger for causing the medium to absorb heat, the heat medium moving device before the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material. Is moved from the low temperature end side to the high temperature end side of the magnetic working body.

  A magnetic heat pump device according to a second aspect of the present invention includes a magnetic working material having a magnetocaloric effect, a magnetic working body through which a heat medium is circulated, and a magnetic field changing device that changes the magnitude of a magnetic field applied to the magnetic working material. A heat medium moving device for reciprocating the heat medium between the high temperature end and the low temperature end of the magnetic working body, a heat dissipating heat exchanger for dissipating the heat medium on the high temperature end side, and heat on the low temperature end side An endothermic heat exchanger for causing the medium to absorb heat, the heat medium moving device after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material. Is moved from the high temperature end side to the low temperature end side of the magnetic working body.

  A magnetic heat pump device according to a third aspect of the present invention includes a magnetic working material having a magnetocaloric effect, a magnetic working body through which a heat medium is circulated, and a magnetic field changing device that changes the magnitude of a magnetic field applied to the magnetic working material. A heat medium moving device for reciprocating the heat medium between the high temperature end and the low temperature end of the magnetic working body, a heat dissipating heat exchanger for dissipating the heat medium on the high temperature end side, and heat on the low temperature end side An endothermic heat exchanger for causing the medium to absorb heat, the heat medium moving device before the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material. Is moved from the low temperature end side of the magnetic working body to the high temperature end side, and the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material, and then the heat medium is cooled from the high temperature end side of the magnetic working body to the low temperature end side. It is moved to the end side.

  According to a fourth aspect of the present invention, there is provided a magnetic heat pump apparatus according to the first or third aspect of the present invention, wherein when the time during which the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material is T1, The apparatus is configured such that the magnetic medium changing device starts increasing the magnitude of the magnetic field applied to the magnetic working material, and the heat medium is transferred from the low temperature end side of the magnetic working body to the high temperature end before a time greater than 0 and less than 0.15 × T1. It is made to move to the side.

  A magnetic heat pump device according to a fifth aspect of the present invention provides a heat transfer medium when the time during which the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working substance in the second or third aspect of the invention is T2. The apparatus is configured such that after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material, the heat medium is moved to the high temperature end side of the magnetic working body after a time of 0.25 × T2 or more and 0.33 × T2 or less. It moves to the low temperature end side from.

  A magnetic heat pump device according to a sixth aspect of the present invention is the magnetic heat pump device according to the third aspect, wherein when the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material by T1, the heat medium moving device The changing device starts to increase the magnitude of the magnetic field applied to the magnetic working material, and moves the heat medium from the low temperature end side to the high temperature end side of the magnetic working body before time greater than 0 and less than 0.15 × T1. At the same time, when the time during which the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material is T2, the heat medium moving device determines the magnitude of the magnetic field applied to the magnetic working material by the magnetic field changing device. The heat medium is moved from the high temperature end side to the low temperature end side of the magnetic working body after 0.25 × T2 or more and 0.33 × T2 or less after the decrease.

  According to the invention of claim 1 or claim 3, the magnetic working material having the magnetocaloric effect, the magnetic working body through which the heat medium is circulated, and the magnetic field that changes the magnitude of the magnetic field applied to the magnetic working material. Change device, heat medium moving device for reciprocating the heat medium between the high temperature end and the low temperature end of the magnetic working body, the heat dissipating side heat exchanger for dissipating the heat medium on the high temperature end side, and the low temperature end side In the magnetic heat pump device including the heat exchanger on the heat absorption side for absorbing heat to the heat medium, the heat medium moving device, before the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material, Since the heat medium is moved from the low temperature end side to the high temperature end side of the magnetic working body, the low temperature heat medium is fed into the magnetic working material before the magnitude of the magnetic field applied to the magnetic working material is increased. The magnetic work that rises with the subsequent increase of the magnetic field It is possible to increase the temperature difference between the materials.

  As a result, the magnetic working material and the heat medium are efficiently exchanged heat, the temperature gradient between the high temperature end and the low temperature end of the magnetic working body is expanded, and the temperature change due to the magnetocaloric effect of the magnetic working material is effective and It can be used efficiently.

  In this case, when the time during which the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material as T1 is set as T1 as in the invention of claim 4 or claim 6, the heat medium moving device is By moving the heat medium from the low temperature end side to the high temperature end side of the magnetic working body, before the time of starting from increasing the magnitude of the magnetic field applied to the magnetic working material, greater than 0 and less than 0.15 × T1, The temperature increase of the magnetic working substance can be effectively used.

  According to the invention of claim 2 or claim 3, the magnetic working material having the magnetocaloric effect is provided, the magnetic working body through which the heat medium is circulated, and the magnitude of the magnetic field applied to the magnetic working material is changed. A magnetic field changing device, a heat medium moving device for reciprocating a heat medium between a high temperature end and a low temperature end of a magnetic working body, a heat dissipating side heat exchanger for dissipating the heat medium on the high temperature end side, and a low temperature In the magnetic heat pump apparatus having the heat absorption side heat exchanger for absorbing heat to the end side heat medium, the heat medium moving device reduces the magnitude of the magnetic field applied to the magnetic working material by the magnetic field changing device. Later, since the heat medium was moved from the high temperature end side to the low temperature end side of the magnetic working body, the heat medium was moved after the magnitude of the magnetic field applied to the magnetic working material was decreased, and the magnetic field decreased. Magnetic working material with decreasing temperature and heat medium Temperature it is possible to more reduce the.

  This effectively uses the temperature drop of the magnetic working material, expands the temperature gradient between the high temperature end and the low temperature end of the magnetic working material, and effectively and efficiently changes the temperature due to the magnetocaloric effect of the magnetic working material. Can be used.

  In this case, when the time during which the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material is T2 as in the inventions of claim 5 and claim 6, the heat medium moving device After a time of 0.25 × T2 or more and 0.33 × T2 or less after the magnitude of the magnetic field applied to the magnetic working material is decreased, the heat medium is moved from the high temperature end side to the low temperature end side of the magnetic working body. This makes it possible to effectively use the temperature drop of the magnetic working material.

It is a whole block diagram of the magnetic heat pump apparatus of the Example to which this invention is applied. FIG. 2 is a cross-sectional view of the magnetic heat pump AMR (Active Magnetic Regenerator) of FIG. 1. It is sectional drawing of the magnetic working body explaining the operation | movement which moves a thermal medium before exciting a magnetic working material. It is sectional drawing of the magnetic working body of the state which excited the magnetic working substance. It is sectional drawing of a magnetic working body when a magnetic working substance is demagnetized. It is sectional drawing of the magnetic working body explaining the operation | movement which moves a thermal medium after demagnetizing a magnetic working material.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a magnetic heat pump device 1 according to an embodiment to which the present invention is applied, and FIG. 2 is a cross-sectional view of an AMR 2 for magnetic heat pump of the magnetic heat pump device 1.

(1) Configuration of Magnetic Heat Pump Device 1 First, the magnetic heat pump AMR 2 in FIG. 2 will be described. The magnetic heat pump AMR 2 of the magnetic heat pump apparatus 1 has a hollow cylindrical housing 3 whose both ends in the axial direction are closed, and a pair of two (two A plurality of permanent magnets 6 (magnetic field generating members) and a rotating body 7 attached in a radial manner. Both ends of the shaft of the rotating body 7 are rotatably supported by the housing 3 and are further connected to a rotating shaft 10 of a motor M (FIG. 1, servo motor) via a speed reducer (not shown). The rotation is controlled. The rotating body 7, the permanent magnet 6, the motor M, and the like constitute a magnetic field changing device that changes the magnitude of the magnetic field applied to the magnetic working material 13 described later. Further, a cam 9 (FIG. 1) for driving a displacer (piston) 8 to be described later is also connected to the rotating shaft 10 of the motor M.

  On the other hand, four magnetic working bodies 11A, 11A, 11B, and 11B, which are twice the number of permanent magnets 6, are arranged in the circumferential direction in the state of being close to the outer peripheral surface of the permanent magnet 6 on the inner periphery of the housing 3. Fixed at regular intervals. In the case of the embodiment, the magnetic working bodies 11A and 11A are arranged in an axially symmetric position with the rotating body 7 interposed therebetween, and the magnetic working bodies 11B and 11B are arranged in an axially symmetric position with the rotating body 7 interposed therebetween (FIG. 2). . Each of the magnetic working bodies 11A and 11B has a magnetic working substance 13 having a magnetocaloric effect in a hollow duct 12 whose cross section is an arc shape along the inner periphery of the housing 3, and a heat medium (here, water). Each is filled so that it can be distributed (FIG. 1).

  Note that the magnetic working bodies 11A and 11B are actually arranged in two axially symmetrical positions as shown in FIG. 2, but one is shown as a representative in FIG. Moreover, in the Example, the duct 12 is comprised with the resin material with high heat insulation. As a result, the heat loss from the magnetic working material 13 to the atmosphere (external) that increases or decreases due to the change of the magnetic field (excitation and demagnetization) as will be described later is reduced. In the embodiment, a Mn-based or La-based material is used as the magnetic working substance 13.

 And in the whole block diagram of the magnetic heat pump apparatus 1 of FIG. 1 incorporating the magnetic heat pump AMR 2, each magnetic working body 11A, 11B has a high temperature end 14 at one end (the right end in FIG. 1) and the other end ( A cold end 16 is provided at the left end in FIG. And the high temperature piping 17 is connected to the high temperature end 14 of each magnetic working body 11A, 11A, 11B, 11B (one representative is shown in FIG. 1), and is pulled out from the housing 3 in FIG. Further, a low-temperature pipe 18 is connected to the low-temperature end 16 of each of the magnetic working bodies 11A, 11A, 11B, and 11B (one representative is shown in FIG. 1) and pulled out from the housing 3 in FIG.

  A heat exchanger 19 on the heat radiation side is connected to the high temperature pipe 17, and a circulation pump 21 is interposed in the high temperature pipe 17. Further, a heat exchanger 22 on the heat absorption side is connected to the low temperature pipe 18, and a circulation pump 23 is interposed in the low temperature pipe 18.

  Displacers (pistons) 8 are respectively disposed at the high temperature end 14 and the low temperature end 16 of each magnetic working body 11A, 11A, 11B, 11B, and are driven by a cam 9 that is rotated by the rotating shaft 10 of the motor M. The heat medium (water) is reciprocated between the high temperature end 14 and the low temperature end 16 of each magnetic working body 11A, 11A, 11B, 11B.

  That is, as shown in FIG. 1, when the displacer 8 on the high temperature end 14 side of the magnetic working bodies 11A and 11A moves backward and the displacer 8 on the low temperature end 16 side advances, the heat medium is transferred from the low temperature end 16 side of the magnetic working body 11A to the high temperature end. 14 side is moved. On the other hand, the displacer 8 on the low temperature end 16 side of the magnetic working bodies 11B and 11B retreats as shown in FIG. 1, the displacer 8 on the high temperature end 14 side advances, and the heat medium moves from the high temperature end 14 side of the magnetic working body 11B to the low temperature end. It is moved to the 16 side. A heat medium moving device for reciprocating the heat medium between the high temperature end 14 and the low temperature end 16 of each of the magnetic working bodies 11A, 11A, 11B, and 11B by the displacer 8, the cam 9, and the motor M, the rotating shaft 10 and the like. Is configured.

(2) Basic Operation of Magnetic Heat Pump Device 1 The basic operation of the magnetic heat pump device 1 having the above configuration will be described. First, when the rotating body 7 is at the 0 ° position (the position shown in FIG. 2), the permanent magnets 6 and 6 are at the 0 ° and 180 ° positions. Therefore, the magnetic work at the 0 ° and 180 ° positions is performed. The magnitude of the magnetic field applied to the magnetic working material 13 of the bodies 11A and 11A increases, and the temperature increases due to excitation. On the other hand, the magnitude of the magnetic field applied to the magnetic working material 13 of the magnetic working bodies 11B and 11B at the 90 ° and 270 ° positions that are 90 ° out of phase with each other decreases, demagnetizing and lowering the temperature.

  When the rotating body 7 is at the 0 ° position (FIG. 2) due to the rotation of the motor M, the cams 9 and 9 are driven by the rotating shaft 10 of the motor M, and the magnetic working bodies 11A and 11A are driven as shown in FIG. The displacer 8 on the high temperature end 14 side is retracted, and the displacer 8 on the low temperature end 16 side is advanced. Thereby, the heat medium is moved from the low temperature end 16 side to the high temperature end 14 side of the magnetic working body 11A.

  As a result, the magnetic working bodies 11A and 11A of the magnetic working bodies 11A and 11A that have been excited by the permanent magnets 6 and 6 are heated to exchange heat with the low-temperature heat medium. The 14 side is high, and the low temperature end 16 side is low.

  When the rotating body 7 is at the 0 ° position (FIG. 2) due to the rotation of the motor M, the cams 9 and 9 are driven by the rotating shaft 10 of the motor M, and the magnetic working bodies 11B and 11B are driven as shown in FIG. The displacer 8 on the high temperature end 14 side is advanced, and the displacer 8 on the low temperature end 16 side is retracted. Thereby, the heat medium is moved from the high temperature end 14 side to the low temperature end 16 side of the magnetic working body 11A. As a result, heat exchange is performed between the magnetic working material 13 of the magnetic working bodies 11B and 11B whose temperature has decreased due to demagnetization and the high-temperature heat medium, and the temperature gradient of the magnetic working bodies 11B and 11B is further expanded.

  Next, when the rotating body 7 is rotated 90 ° by the motor M, the permanent magnets 6 and 6 come to the 90 ° and 270 ° positions, so the magnetic working bodies 11B and 11B at the 90 ° and 270 ° positions. The magnitude of the magnetic field applied to the magnetic working material 13 increases and is excited to increase the temperature. On the other hand, the magnitude of the magnetic field applied to the magnetic working material 13 of the magnetic working bodies 11A and 11A at the positions of 0 ° and 180 ° that are 90 ° out of phase with each other is reduced, demagnetized, and the temperature is lowered.

  When the rotating body 7 is at a 90 ° position due to the rotation of the motor M, the cams 9 and 9 are driven by the rotating shaft 10 of the motor M, and the displacer 8 on the high temperature end 14 side of the magnetic working bodies 11A and 11A is moved. The displacer 8 on the low temperature end 16 side is moved back. Thereby, the heat medium is moved from the high temperature end 14 side to the low temperature end 16 side of the magnetic working body 11A. As a result, the magnetic working material 13 of the magnetic working bodies 11A and 11A whose temperature has decreased due to demagnetization is exchanged with the high-temperature heat medium, and the temperature gradient of the magnetic working bodies 11A and 11A is further expanded.

  When the rotating body 7 reaches the 90 ° position by the rotation of the motor M, the cams 9 and 9 are driven by the rotating shaft 10 of the motor M, and the displacer 8 on the low temperature end 16 side of the magnetic working bodies 11B and 11B is moved. The displacer 8 on the high temperature end 14 side is moved back. Thereby, the heat medium is moved from the low temperature end 16 side to the high temperature end 14 side of the magnetic working body 11B.

  Thereby, the temperature gradient of the magnetic working bodies 11B, 11B is obtained by exchanging heat between the magnetic working material 13 of the magnetic working bodies 11B, 11B excited by the permanent magnets 6, 6 and the low-temperature heat medium. Is further expanded.

  The heat medium on the high temperature end 14 side of each of the magnetic working bodies 11A, 11A, 11B, 11B whose temperature has increased in this way is circulated by the circulation pump 21 through the high temperature pipe 17 to the heat exchanger 19 on the heat radiation side. Further, the heat medium on the low temperature end 16 side of each of the magnetic working bodies 11A, 11A, 11B, and 11B whose temperature has been lowered is circulated by the circulation pump 23 to the heat exchanger 22 on the heat absorption side via the low temperature pipe 18.

  Such rotation of the rotating body 7 by the motor M and switching of the displacer 8 are performed at a relatively high speed and timing, and between the high temperature end 14 and the low temperature end 16 of each magnetic work body 11A, 11A, 11B, 11B. By reciprocating the heat medium (water) and repeating heat absorption / dissipation from the magnetic working material 13 of each magnetic working body 11A, 11A, 11B, 11B to be excited / demagnetized, each magnetic working body 11A, 11A, 11B. The temperature difference between the high temperature end 14 and the low temperature end 16 of 11B gradually increases and eventually the temperature of the low temperature end 16 of each magnetic work body 11A, 11A, 11B, 11B connected to the heat exchanger 22 on the endothermic side is the magnetic work material. The magnetic working bodies 11A, 11A, 1 connected to the heat exchanger 19 on the heat radiation side are lowered to a temperature at which the refrigeration capacity of 13 and the heat load of the cooled object cooled by the heat exchanger 22 are balanced. B, the temperature of the hot end 14 of the 11B becomes substantially constant temperature and the heat dissipation capacity and refrigeration capacity of the heat exchanger 19 and balanced.

(3) Details of switching control of reciprocating movement of heat medium by displacer 8 Next, the timing of switching the movement (reciprocating movement) of the heat medium by the displacer 8 will be described in detail with reference to FIGS. In addition, although each figure demonstrates the magnetic working body 11A, it is the same also about the magnetic working body 11B. Further, the following switching timing is achieved mainly by the shape of the cam 9 in the embodiment.

  First, in the present invention, when exciting the magnetic working substance 13 of the magnetic working body 11A as shown in FIG. 1 (increasing the magnetic field), before the magnetic working body 11A is excited by the permanent magnet 6 as shown in FIG. The heat medium is moved from the low temperature end 16 side to the high temperature end 14 side of the magnetic working body 11A. In this case, in the embodiment, when the time during which the permanent magnet 6 excites the magnetic working material 13 of the magnetic working body 11A (increases the magnitude of the applied magnetic field) is T1, the displacer 8 causes the permanent magnet 6 to be magnetic. The heating medium (water) is heated from the low temperature end 16 side of the magnetic working body 11A to a high temperature before the time when the working material 13 begins to be excited (increases the magnitude of the applied magnetic field) and is less than 0.15 × T1. Move to end 14 side.

  Since the magnetic working substance 13 is not excited at this time, the temperature of the flowing low-temperature heat medium (indicated by W1 in each figure. W2 is the high-temperature heat medium) is indicated by a solid line L1 in FIG. Thus, it becomes lower than the case where it is made to flow simultaneously with excitation (broken line L2). Thereafter, the magnetic working material 13 of the magnetic working body 11A is excited by the permanent magnet 6 as shown in FIG. 4, so that the temperature is as shown by the solid line L3 in FIG. The temperature difference of the heat medium (L3−L1) is larger than the temperature difference (L3−L2) in the case where the heat medium flows simultaneously.

  On the other hand, in the present invention, even after the magnetic working material 13 of the magnetic working body 11A is demagnetized (the magnetic field is reduced), the displacer 8 is not operated as shown in FIG. To do. The broken line L4 shown in FIG. 5 is the temperature of the heat medium in this case, and the broken line L5 is the temperature of the heat medium when the heat medium is moved simultaneously with demagnetization. The temperature of the broken line L4 is lower than that of the broken line L5.

  Thereafter, as shown in FIG. 6, the displacer 8 moves the heat medium from the high temperature end 14 side to the low temperature end 16 side of the magnetic working body 11A. In this case, in the embodiment, when the time during which the permanent magnet 6 demagnetizes the magnetic working material 13 (decreasing the magnitude of the applied magnetic field) is T2, the displacer 8 causes the permanent magnet 6 to demagnetize the magnetic working material 13. After 0.25 × T2 or more and 0.33 × T2 or less after (decreasing the magnitude of the applied magnetic field), the heat medium is moved from the high temperature end 14 side to the low temperature end 16 side of the magnetic working body 11A. Let In the figure, L6 is the temperature of the magnetic working material 13 at this time.

  As described above, in the present invention, before the displacer 8 increases (excites) the magnitude of the magnetic field applied to the magnetic working material 13 by the displacer 8, the heat medium is transferred to the low temperature end 16 side of the magnetic working bodies 11A and 11B. Therefore, before the magnitude of the magnetic field applied to the magnetic working material 13 is increased, a low-temperature heat medium is sent to the magnetic working material 13 and the magnetic field is increased thereafter. The temperature difference from the rising magnetic working substance 13 can be increased.

  Thereby, the magnetic working material 13 and the heat medium are efficiently heat-exchanged, the temperature gradient between the high temperature end 14 and the low temperature end 16 of the magnetic working bodies 11A and 11B is expanded, and the amount of magnetic heat of the magnetic working material 13 is increased. The temperature change due to the effect can be used effectively and efficiently.

  In this case, in the embodiment, assuming that the time during which the magnitude of the magnetic field applied to the magnetic working material 13 by the permanent magnet 6 is T1, the displacer 8 uses the magnetic field applied to the magnetic working material 13 by the permanent magnet 6. Since the heat medium is moved from the low temperature end 16 side to the high temperature end 14 side of the magnetic working bodies 11A and 11B before the time of 0.15 × T1 or less before starting to increase the size of the magnetic recording medium, the effect Thus, the temperature increase of the magnetic working material 13 can be utilized.

  Further, after the displacer 8 reduces the magnitude of the magnetic field applied to the magnetic working material 13 by the permanent magnet 6, the heat medium is moved from the high temperature end 14 side to the low temperature end 16 side of the magnetic working bodies 11A and 11B. As described above, the heat medium is moved after the magnitude of the magnetic field applied to the magnetic working material 13 is decreased, and the temperature of the heat medium is further decreased by the magnetic working material 13 whose temperature is lowered by the decrease of the magnetic field. Will be able to.

  Thereby, the temperature drop between the high temperature end 14 and the low temperature end 16 of the magnetic working bodies 11 </ b> A and 11 </ b> B is expanded by effectively using the temperature drop of the magnetic working material 13, and the magnetocaloric effect of the magnetic working material 13 is increased. The temperature change can be used effectively and efficiently.

  In this case, in the embodiment, when the time during which the magnitude of the magnetic field applied to the magnetic working material 13 by the permanent magnet 6 is reduced to T2, the magnetic field applied to the magnetic working material 13 by the displacer 8 by the displacer 8. The heat medium is moved from the high temperature end 14 side to the low temperature end 16 side of the magnetic working bodies 11A and 11B after a time of 0.25 × T2 or more and 0.33 × T2 or less after the size of the magnetic material is reduced. Therefore, the temperature decrease of the magnetic working material 13 can be effectively used.

  In the embodiment, the control of moving the heat medium from the low temperature end 16 side to the high temperature end 14 side before exciting the magnetic working material 13, and after demagnetizing the magnetic work material 13, the heat medium is moved from the high temperature end 14 side to the low temperature. Although both of the controls for moving to the end 16 side have been implemented, the present invention is not limited thereto, and only one of them is effective.

  Further, the overall configuration of the magnetic heat pump device is not limited to the embodiment, and the heat medium moving device may be configured by a circulation pump or a rotary valve instead of the displacer 8.

1 Magnetic heat pump device 2 AMR for magnetic heat pump
3 Housing 6 Permanent magnet (Magnetic field changing device)
7 Rotating body (magnetic field changing device)
8 Displacer (heat transfer device)
9 cam (heat transfer device)
11A, 11B Magnetic working body 12 Duct 13 Magnetic working material 14 High temperature end 16 Low temperature end 19, 22 Heat exchanger M Motor

Claims (6)

A magnetic working body comprising a magnetic working material having a magnetocaloric effect and through which a heat medium is distributed;
A magnetic field changing device for changing the magnitude of the magnetic field applied to the magnetic working substance;
A heat medium moving device for reciprocating the heat medium between a high temperature end and a low temperature end of the magnetic working body;
A heat exchanger on the heat dissipation side for dissipating the heat medium on the high temperature end side, and
In a magnetic heat pump device comprising a heat exchanger on the heat absorption side for causing the heat medium on the low temperature end side to absorb heat,
The heat transfer device is
Before the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working substance, the heat medium is moved from the low temperature end side to the high temperature end side of the magnetic working body. . A magnetic working body comprising a magnetic working material having a magnetocaloric effect and through which a heat medium is distributed;
A magnetic field changing device for changing the magnitude of the magnetic field applied to the magnetic working substance;
A heat medium moving device for reciprocating the heat medium between a high temperature end and a low temperature end of the magnetic working body;
A heat exchanger on the heat dissipation side for dissipating the heat medium on the high temperature end side, and
In a magnetic heat pump device comprising a heat exchanger on the heat absorption side for causing the heat medium on the low temperature end side to absorb heat,
The heat transfer device is
A magnetic heat pump device that moves the heat medium from the high temperature end side to the low temperature end side of the magnetic working body after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material. . A magnetic working body comprising a magnetic working material having a magnetocaloric effect and through which a heat medium is distributed;
A magnetic field changing device for changing the magnitude of the magnetic field applied to the magnetic working substance;
A heat medium moving device for reciprocating the heat medium between a high temperature end and a low temperature end of the magnetic working body;
A heat exchanger on the heat dissipation side for dissipating the heat medium on the high temperature end side, and
In a magnetic heat pump device comprising a heat exchanger on the heat absorption side for causing the heat medium on the low temperature end side to absorb heat,
The heat transfer device is
Before the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material, the heat medium is moved from the low temperature end side to the high temperature end side of the magnetic working body, and
A magnetic heat pump device that moves the heat medium from the high temperature end side to the low temperature end side of the magnetic working body after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material. . When the time during which the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material is T1,
The heat transfer device moves the heat transfer medium to the magnetic work before a time greater than 0 and less than 0.15 × T1 before the magnetic field changing device starts to increase the magnitude of the magnetic field applied to the magnetic work material. The magnetic heat pump device according to claim 1 or 3, wherein the magnetic heat pump device is moved from a low temperature end side to a high temperature end side of the body. When the time during which the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material is T2,
The heat transfer device moves the heat transfer medium after a time of 0.25 × T2 or more and 0.33 × T2 or less after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material. The magnetic heat pump device according to claim 2 or 3, wherein the magnetic working body is moved from a high temperature end side to a low temperature end side. When the time during which the magnetic field changing device increases the magnitude of the magnetic field applied to the magnetic working material is T1,
The heat transfer device moves the heat transfer medium to the magnetic work before a time greater than 0 and less than 0.15 × T1 before the magnetic field changing device starts to increase the magnitude of the magnetic field applied to the magnetic work material. While moving from the cold end of the body to the hot end,
When the time during which the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material is T2,
The heat transfer device moves the heat transfer medium after a time of 0.25 × T2 or more and 0.33 × T2 or less after the magnetic field changing device reduces the magnitude of the magnetic field applied to the magnetic working material. The magnetic heat pump device according to claim 3, wherein the magnetic working body is moved from a high temperature end side to a low temperature end side.

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