Patent Publication Number: US-2023152010-A1

Title: Magnetic heat pump and magnetic refrigeration cycle apparatus

Description:
TECHNICAL FIELD 
     The present disclosure relates to a magnetic heat pump and a magnetic refrigeration cycle apparatus. 
     BACKGROUND ART 
     Magnetic refrigeration technology, is known as an environment-friendly refrigeration technology. Magnetic refrigeration technology utilizes a phenomenon (magnetocaloric effect) in which when a magnetic field is applied to a material called magnetocaloric material kept in an adiabatic state, the temperature of the magnetocaloric material increases, and when a magnetic field is removed, the temperature of the magnetocaloric material decreases. 
     Conventionally, active magnetic regenerative (AMR) magnetic refrigeration cycle apparatuses are known (for example, see WO2016/018451). An active magnetic regenerative (AMR) magnetic refrigeration cycle apparatus includes a magnetic heat pump in which heating and cooling of a heat transport medium is performed by a magnetocaloric effect caused by exposing a magnetocaloric material to a changing magnetic field, and a pump disposed outside the magnetic heat pump to feed the heat transport medium to the magnetic heat pump. 
     CITATION LIST 
     Patent Literature 
     
         
         PTL 1: WO2016/018451 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     A main object of the present disclosure is to provide a magnetic heat pump that can save the power of a pump disposed outside the magnetic heat pump or can eliminate the need of the pump, and a magnetic refrigeration cycle apparatus. 
     Solution to Problem 
     A magnetic heat pump according to the present disclosure includes at least one magnetocaloric member, an impeller, at least one deformable member, a casing, an electric motor, and a magnetic field generator. The at least one magnetocaloric member is made of a magnetocaloric material. The impeller has a center axis and at least one accommodation chamber aligned in a circumferential direction with respect to the center axis and accommodating the at least one magnetocaloric member. The at least one deformable member faces the at least one accommodation chamber and has a shape individually changing. The casing has an interior space accommodating the at least one magnetocaloric member, the impeller, and the at least one deformable member and allowing a heat transport medium to circulate, a first inlet for the heat transport medium to flow into the interior space, and a first outlet spaced apart from the first inlet in the circumferential direction and for the heat transport medium to flow out of the interior space. The electric motor integrally rotates the impeller, the at least one magnetocaloric member, and the at least one deformable member in a first direction from the first inlet toward the first outlet in the circumferential direction. The magnetic field generator produces a magnetic field becoming stronger along the first direction, in a first region extending from the first inlet to the first outlet in the first direction in the interior space. The at least one accommodation chamber is open toward an outside in a radial direction with respect to the center axis. The shape of the at least one deformable member individually changes with the rotation. The at least one accommodation chamber has a volume individually increasing and decreasing with the change of the shape of the at least one deformable member. The volume when the at least one accommodation chamber is located in the first region is larger than the volume when the at least one accommodation chamber is located in a second region located backward of the first inlet in the first direction and the volume when the at least one accommodation chamber is located in a third region located forward of the first outlet in the first direction. 
     Advantageous Effects of Invention 
     The present disclosure provides a magnetic heat pump that can save the power of a pump disposed outside the magnetic heat pump or can eliminate the need of the pinup, and a magnetic refrigeration cycle apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a cross-sectional view of a magnetic heat pump according to a first embodiment. 
         FIG.  2    is a perspective view of the magnetic heat pump according to the first embodiment. 
         FIG.  3    is a partial cross-sectional view as viewed from arrow III-III in  FIG.  1   . 
         FIG.  4    is a partial cross-sectional view as viewed from arrow IV-IV in  FIG.  1   . 
         FIG.  5    is a partial cross-sectional view as viewed from arrow V-V in  FIG.  3   , 
         FIG.  6    is a block diagram illustrating a magnetic refrigeration cycle apparatus according to the first embodiment. 
         FIG.  7    is a cross-sectional view of a magnetic heat pump according to a second embodiment. 
         FIG.  6    is a block diagram illustrating a magnetic refrigeration cycle apparatus according to the second embodiment. 
         FIG.  9    is a cross-sectional view of a magnetic heat primp according to a third embodiment. 
         FIG.  10    is a partial cross-sectional view as viewed from arrow X-X in  FIG.  9   . 
         FIG.  11    is a block diagram illustrating a magnetic refrigeration cycle apparatus according to a fourth embodiment. 
         FIG.  12    is a block diagram illustrating a part of a magnetic refrigeration cycle apparatus according to a fifth embodiment. 
         FIG.  13    is a block diagram illustrating a magnetic refrigeration cycle apparatus according to a sixth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present disclosure will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals and a description thereof will not be repeated. 
     First Embodiment 
     &lt;Configuration of Magnetic Heat Pump&gt; 
     As illustrated in  FIG.  1    and  FIG.  2   , a magnetic heat pump  100  according to a first embodiment mainly includes a plurality of magnetocaloric members  1 , an impeller  2 , a plurality of deformable members  3 , a casing  4 , an electric motor  5 , and a magnetic field generator  6 . 
     As illustrated in  FIG.  1   ,  FIG.  3   , and  FIG.  4   , magnetocaloric members  1 , impeller  2 , deformable members  3 , and a part of a shaft  5 A of electric motor  5  are accommodated inside casing  4 . As illustrated in  FIG.  1    and  FIG.  2   , the remaining part of electric motor  5  and magnetic field generator  6  are disposed outside casing  4 . Each of magnetocaloric members  1 , impeller  2 , and deformable members  3  is fixed to shaft  5 A of electric motor  5 . Electric motor  5  rotates each of magnetocaloric members  1 , impeller  2 , and deformable members  3  in one direction along a circumferential direction with respect to center axis CA (see  FIG.  1   ). Hereinafter the one direction is called first direction A. The rotation speeds of magnetocaloric members  1 , impeller  2 , and deformable members  3  are equal to each other. With the rotation, a relative positional relation of magnetocaloric members  1 , impeller  2 , and deformable members  3  to casing  4  changes.  FIG.  1    is a cross-sectional view illustrating one state in the change. In  FIG.  1   , the first direction A is counterclockwise. 
     The material forming each of magnetocaloric members  1  includes a magnetocaloric material. The magnetocaloric material is a material that brings about a magnetocaloric effect and includes, for example, gadolinium (Gd). 
     Each of magnetocaloric members  1  has, for example, at least one slit  1 A. Slits  1 A are aligned in the circumferential direction and extend along a radial direction B with respect to center axis CA thereinafter radial direction B) and an extending direction C of center axis CA (hereinafter extending direction C). In other words, each of magnetocaloric members  1  has a pair of surfaces Opposed to each other in the circumferential direction. The spacing in the circumferential direction between slits  1 A is constant, for example, irrespective of the position in the radial direction B. In  FIG.  1   , magnetocaloric members  1  are hatched for convenience of explanation in order to clarify magnetocaloric members  1  and slits  1 A. 
     Each of magnetocaloric members  1  has, for example, a plurality of slits  1 A. Slits  1 A are aligned in the circumferential direction and each extend along the radial direction B and the extending direction C. In other words, each of magnetocaloric members  1  has a plurality of pairs of surfaces opposed to each other in the circumferential direction. The number of slits  1 A formed in one magnetocaloric member  1  is not limited and, for example, four. 
     The surface area of each of magnetocaloric members  1  is, for example, larger, than the surface area of each of a plurality of vanes  211  of impeller  2 . 
     Impeller  2  has center axis CA. Impeller  2  includes a base  2 A and a plurality of vanes  2 B. Base  2 A is fixed to shaft  5 A of electric motor  5 , Base  2 A is formed in an annular shape and has an inner peripheral surface fitted on shaft  5 A. A plurality of vanes  211  are aligned and spaced apart from each other in the circumferential direction. 
     Each of magnetocaloric members  1  is disposed between two vanes  2 B adjacent to each other in the circumferential direction among a plurality of vanes  2 B. In other words, impeller  2  has a plurality of accommodation chambers  2 C aligned in the circumferential direction and each accommodating one of magnetocaloric members  1 , Accommodation chambers  2 C are disposed at regular intervals in the circumferential direction. The number of accommodation chambers  2 C is not limited and, for example, 12. 
     The configurations of accommodation chambers  2  are, for example, equal to each other. Each of accommodation chambers  2 C has a bottom surface facing the outside in the radial direction B, a side surface facing the front side in the first direction A, and a side surface facing the back side in the first direction A. The bottom surface of each of accommodation chambers  2 C is formed with, for example, the outer peripheral surface of base  2 A. An end portion located on the inside in the radial direction B of each magnetocaloric member  1  is fixed to the bottom surface of the corresponding one of accommodation chambers  2 C. The side surface of each of accommodation chambers  2 C, is formed with, for example, a side surface of a corresponding one of vanes  2 B. The side surface of each of accommodation chambers  2 C is, for example, spaced apart from the corresponding one of magnetocaloric members  1  in the circumferential direction. 
     Each of accommodation chambers  2 C is open toward the outside in the radial direction B. The spacing in the circumferential direction between accommodation chambers  2  is constant, for example, irrespective of the position in the radial direction B. Base  2 A and a plurality of vanes  28  are formed, for example, integrally. 
     Each of deformable members  3  fines accommodation chamber  2 C. Each of deformable members  3  has its shape individually changing. Each of deformable members  3  includes a stationary part  3 A, a movable part  3 B, and a plurality of first elastic parts  3 C. 
     Stationary part  3 A does not move relative to magnetocaloric member  1  and is fixed. Stationary part  3 A rotates together with a plurality of magnetocaloric members  1  and impeller  2  in the circumferential direction but does not move in the radial direction. Stationary part  3 A is disposed, for example, outside each of accommodation chambers  2 C. Stationary part  3 A is fixed, for example, to shaft  5 A. 
     Movable part  3 B moves relative to magnetocaloric member  1  along the radial direction B. Movable part  3 B rotates together with a plurality of magnetocaloric members  1  and impeller  2  in the circumferential direction and moves in the radial direction. Movable part  3 B is disposed inside each of accommodation chambers  2 C. 
     As illustrated in  FIG.  5   , in a cross section perpendicular to the extending direction C, movable part  3 B has, for example, a lengthwise direction orthogonal to the radial direction B and a crosswise direction orthogonal to the lengthwise direction, Movable part  3 B has a plurality of portions  3 B 1  inserted in slits  1 A and a plurality of portions  3 B 2  disposed outside slits  1 A. A plurality of portions  3 B 1  and a plurality of portions  3132  are connected to each other, for example, at both ends in the extending direction C. A plurality of portions  3 B 1  and a plurality of portions  3 B 2  may be connected to each other, for example, at one end in the extending direction. C. In other words, as viewed from the radial direction B, the outer shape of movable part  3 B may be a comb-like shape. 
     A plurality of first elastic parts  3 C rotate together with a plurality of magnetocaloric members  1  and impeller  2  in the circumferential direction and are elastically deformed in the radial direction B. A plurality of first elastic parts  3 C are disposed to sandwich movable part  3 B in the extending direction C. Each of deformable members  3  includes at least one first elastic part  3 C. 
     Each first elastic part  3 C has a first end portion located on the inside in the radial direction B and a second end portion located on the outside in the radial direction B. The first end portion is connected to stationary part  3 A. The second end portion is connected to movable part  3 B. 
     Stationary parts  3 A of a plurality of deformable members  3  are thrilled integrally. Movable parts  3 B of deformable members  3  move individually. First elastic parts  3 C of deformable members  3  are elastically deformed individually. 
     Each of deformable members  3  further includes, for example, a plurality of connecting parts  3 D connecting movable part  3 B to the second end portion of first elastic part  3 C. A plurality of connecting parts  3 D are disposed to sandwich movable part  3 B in the extending direction C. 
     Each, connecting part  3 D can rotate relative to movable part  3 B in the circumferential direction with respect to the axis passing through the center in the lengthwise direction and the crosswise direction of movable part  3 B and extending along the extending direction C. In a cross section perpendicular to the extending direction. C, the shape of connecting part  3 D is, for example, a circular shape. Connecting part  3 D has, for example, a cylindrical shape. An outer peripheral surface  3 D 1  of connecting part  3 D has a portion fixed to the second end portion of first elastic part  3 C and a portion in contact with an inner peripheral surface of a guide member  7  described later. 
     Casing  4  has an interior space that accommodates a plurality of magnetocaloric members  1 , impeller  2 , a plurality of deformable members  3 , and a part of shaft  5 A of electric motor  5  and allows a heat transport medium to circulate. The interior space has, for example, a cylindrical shape. The heat transport medium is, for example, water or ethanol. 
     Further, casing  4  has a first inlet P 1  for a heat transport medium to flow into the interior space and a first outlet P 2  spaced apart from first inlet P 1  in the circumferential direction and for a heat transport medium to flow out of the interior space. First outlet P 2  is disposed on the front side in the first direction A relative to first inlet P 1 . First inlet P 1  is, for example, opposed to first outlet P 2  with the interior space interposed. First inlet P 1  and first outlet P 2  are disposed, for example, to sandwich only, a spatial portion located on the outside of shaft  5 A, base  2 A, and stationary part  3 A in the radial direction B in the interior space. 
     Further, casing  4  has a second inlet P 3  for a heat transport medium to flow into the interior space and a second outlet P 4  spaced apart from second inlet P 3  in the circumferential direction and for a heat transport medium to flow our of the interior space. Second outlet P 4  is disposed on the front side in the first direction A relative to second inlet P 3 , Second inlet P 3  is, for example, opposed to second outlet P 4  with the interior space interposed. Second inlet P 3  and second outlet. P 4  are disposed, for example, to sandwich only a spatial portion located on the outside of shaft  5 A, base  2 A, and stationary part  3 A in the radial direction Bin the interior space. 
     Second inlet P 3  is disposed on the front side in the first direction A relative to first outlet P 2 . First inlet P 1  is disposed on the front side in the first direction A relative to second outlet P 4 . That is, first inlet P 1 , first outlet P 2 , second inlet P 3 , and second outlet P 4  are disposed in this order from the back side to the front side in the first direction A. 
     Casing  4  has a first inner peripheral surface  4 A facing the interior space and facing the inside in the radial direction B. First inner peripheral surface $A has openings continuous to first inlet P 1 , first outlet P 2 , second inlet P 3 , and second outlet P 4 . 
     The interior space has a first region, a second region, a third region, and a fourth region. The first region, the second region, the third region, and the fourth region are continuous to each other. 
     The first region extends from first inlet P 1  to first outlet P 2  in the first direction A. In  FIG.  1   , the first region is a sector-shaped space located between a virtual line L 1  connecting center axis CA and a portion located on the back side in the first direction A of the opening of first inlet P 1  and a virtual line L 2  connecting center axis CA and a portion located on the front side in the first direction A of the opening of first outlet P 2 . 
     The second region is located backward of first inlet P 1  in the first direction A. The second region is a sector-shaped space located between the virtual line L 1  and a virtual line L 4  connecting center axis CA and a portion located on the front side in the first direction A of the opening of second outlet P 4 . The third region is located forward of first outlet P 2  in the first direction A. The third region is a sector-shaped space located between the virtual line  12  and a virtual line L 3  connecting center axis CA and a portion located on the back side in the first direction A of the opening of second inlet P 3 . The fourth region extends from second inlet P 3  to second outlet P 4  in the first direction A. The fourth region is a sector-shaped space located between the virtual line L 3  and the virtual line L 4 . The virtual line L 1  is disposed, for example, on the same straight line as the virtual line  13 . The virtual line L 2  is disposed, far example, on the same straight line as the virtual line  1 A. 
       FIG.  3    is a partial cross-sectional view along the radial direction B of the first region.  FIG.  4    is a partial cross-sectional view along the radial direction of the second region. 
     At least one accommodation chamber  2 C of a plurality of accommodation chambers  2 C is disposed in each of the first region, the second region, the third region, and the fourth region. In the state illustrated in  FIG.  1   , four accommodation chambers  2 C are disposed in each of the first region and the fourth region, and two accommodation chambers  2 C are disposed in each of the second region and the third region. In a state different from the state illustrated in, for example, three accommodation chambers  2 C are disposed in each of the first region and the fourth region, and three accommodation chambers  2 C are disposed in each of the second region and the third region. 
     The distance in the radial direction B between center axis CA and a portion facing each of the first region, the second region, the third region, and the fourth region in the first inner peripheral surface  4 A is equal. 
     Electric motor  5  has shaft  5 A and a drive that rotates shaft  5 A in the first direction A. A part of shaft  5 A is accommodated in the interior space of casing  4 . The remaining part other than the above part of shaft  5 A of electric motor  5  is disposed outside casing  4 . 
     Magnetic field generator  6  is disposed outside casing  4 . Magnetic field generator  6  produces a magnetic field becoming stronger along the first direction A in the first region. Magnetic field generator  6  produces a magnetic field becoming weaker along the first direction A in the third region. Magnetic field generator  6  produces, for example, a stronger magnetic, field in a region continuous to first outlet P 2  in the first region than in a region continuous to first inlet P 1  in the first region. The magnetic field in the first region is stronger along the first direction A. The magnetic field in the region continuous to first outlet P 2  in the first region is stronger than the magnetic field in the region continuous to first inlet P 1  in the first region. The magnetic field in the second region is constant along the first direction A. The magnetic field in the fourth region is constant along the first direction A. The magnetic field in the region continuous to second outlet P 4  in the fourth region has a strength equivalent to that of the magnetic field in the region continuous to second inlet P 3 . The direction of each magnetic field is along the extending direction C. 
     Magnetic field generator  6  can have any configuration that can produce the strength distribution of magnetic fields as described above and includes, for example, at least one of permanent magnets, electromagnets, and superconducting magnets. Magnetic field generator  6  may further include a yoke to produce a strong magnetic field, Magnetic field generator  6  may include a Halbach array of permanent magnets in order to produce a strong magnetic field. 
     Magnetic heat pump  100  further includes guide member  7 , Guide member  7  has a fixed position relative to easing  4 . Guide member  7  guides movable part  3 B that moves in the first direction A as deformable members  3  rotate in the first direction A, in the radial direction B. 
     As illustrated in  FIG.  3    and  FIG.  4   , guide member  7  has a second inner peripheral surface  7 A facing the inside in the radial direction B. Movable part  3 B is pressed against second inner peripheral surface  7 A of guide member  7  by first elastic pan  3 C. Outer peripheral surface  3 B 1  of movable part  3 B is in contact with second inner peripheral surface  7 A. Second inner peripheral surface  7 A is opposed to the outer peripheral surface of stationary part  3 A in the radial direction B. 
     Second inner peripheral surface  7 A of guide member  7  has a first surface portion  7 A 1  (first portion) disposed in the first region, a second surface portion  7 A 2  (second portion) disposed in the second region, a third surface portion  7 A 3  (third portion) disposed in the third region, and a fourth surface portion  7 A 4  disposed in the fourth region. 
     As illustrated in  FIG.  1   , in the first direction A, a part disposed on the front side of second surface portion  7 A 2  is disposed, for example, in a region located on the back side in the first region. A part located on the front side of second surface portion  7 A 2  in the first direction A faces, for example, first inlet P 1 . In the first direction A, a part disposed on the back side of third surface portion  7 A 3  is disposed in a region located on the front side in the first region. A part located on the back side of third surface portion  7 A 3  in the first direction A faces, for example, first outlet P 2 . 
     In the first direction A, a part disposed on the front side of third surface portion  7 A 3  is disposed in a region located on the back side in the fourth region. A part located on the front side of third surface portion  7 A 3  in the first direction A faces, for example, second inlet P 3 . In the first direction A, a part disposed on the back side of second surface portion  7 A 2  is disposed, for example, in a region located on the front side in the fourth region. A part located on the back side of second surface portion  7 A 2  in the first direction A faces, for example, second outlet P 4 . 
     In the radial direction B, first surface portion  7 A 1  and fourth surface portion  7 A 4  are disposed on the inside of the center of each magnetocaloric member  1 . In the radial direction B, second surface portion  7 A 2  and third surface portion  7 A 3  are disposed on the inside of the center of each magnetocaloric member  1 . 
     The distance in the radial direction B between first surface portion  7 A  1  and first inner peripheral surface  4 A is longer than the distance in the radial direction B between first surface portion  7 A 1  and the outer peripheral surface of base  2 A. The distance in the radial direction B between second surface portion  7 A 2  and first inner peripheral surface  4 A is shorter than the distance in the radial direction B between second surface portion  7 A 2  and the outer peripheral surface of base  2 A. The distance in the radial direction  13  between third surface portion  7 A 3  and first inner peripheral surface  4 A is shorter than the distance in the radial direction B between third surface portion  7 A 3  and the outer peripheral surface of base  2 A. The distance in the radial direction B between fourth surface portion  7 A 4  and first inner peripheral surface  4 A is longer than the distance in the radial direction B between fourth surface portion  7 A 4  and the outer peripheral surface of base  2 A. 
     The distance in the radial direction B between first surface portion  7 M and first inner peripheral surface  4 A is longer than the distance in the radial direction B between second surface portion  7 A 2  and first inner peripheral surface  4 A and the distance in the radial direction B between third surface portion  7 A 3  and first inner peripheral surface  4 A. The distance in the radial direction B between first surface portion  7 A 1  of second inner peripheral surface  7 A and center axis CA is shorter than the distance in the radial direction B between second surface portion  7 A 2  and center axis CA and the distance in the radial direction B between third surface portion  7 A 3  and center axis CA. 
     The distance in the radial direction B between fourth surface portion  7 A 4  and first inner peripheral surface  4 A is longer than the distance in the radial direction. B between second surface portion  7 A 2  and first inner peripheral surface  4 A and the distance in the radial direction B between third surface portion  7 A 3  and first inner peripheral surface  4 A. The distance in the radial direction B between fourth surface portion  7 A 4  of second inner peripheral surface  7 A and center axis CA is shorter than the distance in the radial direction B between second surface portion  7 A 2  and center axis CA and the distance in the radial direction B between third surface portion  7 A 3  and center axis CA. 
     The distance in the radial direction between first surface portion  7 A 1  and first inner peripheral surface  4 A is, for example, equal to the distance in the radial direction between fourth surface portion  7 A 4  and first inner peripheral surface  4 A. The distance in the radial direction B between second surface portion  7 A 2  and first inner peripheral surface  4 A is, for example, equal to the distance in the radial direction B between third surface portion  7 A 3  and first inner peripheral surface  4 A. 
     Second inner peripheral surface  7 A of guide member  7  further has a fifth surface portion connecting second surface portion  7 A 2  and first surface portion  7 A 1 , a sixth surface portion connecting, first surface portion  7 A 1  and third surface portion  7 A 3 , a seventh surface portion connecting third surface portion  7 A 3  and fourth surface portion  7 A 4 , and an eighth surface portion connecting fourth surface portion  7 A 4  and second surface portion  7 A 2 . 
     The fifth surface portion is inclined from the outside toward the inside in the radial direction B as it approaches from the from side toward the back side in the first direction A. The sixth surface portion is inclined from the inside toward the outside in the radial direction B as it approaches from the front side toward the back side in the first direction. A. The seventh surface portion is inclined from the outside toward the inside in the radial direction B as it approaches from the front side toward the back side in the first direction A. The eighth surface portion is inclined from the inside toward the outside in the radial direction B as it approaches from the front side toward the back side in the first direction A. 
     The fifth Surface portion is disposed, for example in a region located on the back side in the first region in the first direction A. The sixth surface portion is disposed, for example, in a region located on the front side in the first region in the first direction A. The seventh surface portion is disposed, for example, in a region located on the hack side in the fourth region in the first direction A. The eighth surface portion is disposed, for example, in a region located on the front side in the fourth region in the first direction A. 
     The central angle formed by one end and the other end in the circumferential direction of each of the filth surface portion, the sixth surface portion, the seventh surface portion, and the eighth surface portion with respect to center axis CA is, for example, smaller than the central angle formed by one end and the other end in the circumferential direction of movable part  3 B with respect to center axis CA. 
     The length in the radial direction B between the first end portion and the second end portion of first elastic part  3 C located in the first region is shorter than the length in the radial direction B between the first end portion and the second end portion of first elastic part  3 C located in the second region and the length in the radial direction B between the first end portion and the second end portion of first elastic part  3 C located in the third region. 
     In magnetic heat pump  100  according to the first embodiment, the volume of each of accommodation chambers  2 C is defined as the volume of the space located on the outside in the radial direction B of movable part  3 B in each accommodation chamber  3 C. The volume of each of accommodation chambers  2 C changes depending on in which of the first region, the second region, the third region, and the fourth region each accommodation chamber  2 C is located. 
     The volume when each of accommodation chambers  2 C is located in the first region is larger than the volume when each of accommodation chambers  2 C is located in the second region and the volume when it is located in the third region. The volume when each of accommodation chambers  2 C is located in the fourth region is larger than the volume when each of accommodation chambers  2 C is located in the second region and the volume when it is located in the third region. That is, the volume of each of accommodation chambers  2 C increases and decreases with the rotation. 
     The volume when each of accommodation chambers  2 C is located in the first region is, for example, equal to the volume when each of accommodation chambers  2 C is located in the fourth region. The volume when each of accommodation chambers  2 C is located in the second region is, for example, equal to the volume when each of accommodation chambers  2 C is located in the third region. 
     &lt;Operation of Magnetic Heat Pump&gt; 
     In operation of magnetic heat pump  100 , magnetocaloric members  1 , impeller  2 , and deformable members  3  rotate in the first direction A, so that the position of each of magnetocaloric members  1 , impeller  2 , and deformable members  3  relative to casing  4  and guide member  7  changes. Further, in operation of magnetic heat pump  100 , magnetic field generator  6  produces the magnetic field described above. 
     When accommodation chamber  2 C is located in the second region of casing  4 , outer peripheral surface  3 D 1  of connecting part  3 D is pressed by first elastic part  3 C against second surface portion  7 A 2  of second inner peripheral surface  7 A, so that movable part  3 B is positioned on the outside of the center in the radial direction B of magnetocaloric member  1  in the accommodation chamber  2 C. At this moment, the volume of accommodation chamber  2 C is relatively small. 
     With the rotation, accommodation chamber  2 C disposed in the second region moves to the first region. Outer peripheral surface  3 D 1  of connecting part  3 D is guided by the fifth surface portion of second inner peripheral surface  7 A to reach first surface portion  7 A 1 . When outer peripheral surface  3 D 1  of connecting part  3 D is guided to the fifth surface portion, the volume of accommodation chamber  2 C gradually increases. That is, the volume of accommodation chamber  2 C increases in a region facing first inlet P 1  in the first region. Thus, a heat transport medium HM (see  FIG.  1   ) flows into accommodation chamber  2 C through first inlet P 1 . 
     When accommodation chamber  2 C is disposed in the first region of casing  4 , outer peripheral surface.  3 D 1  of connecting part  3 D is pressed by first elastic part  3 C against first surface portion  7 A 1 , so that movable part  3 B is positioned on the inside of the center in the radial direction. B of magnetocaloric member  1  in the accommodation chamber  2 C. The volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  31 ) is pressed against first surface portion  7 A 1  is larger than the volume of accommodation chamber  2 C when outer peripheral surface  301  of connecting part  3 D is pressed against: second surface portion  7 A 2 . 
     Heat transport medium HM flowing into accommodation chamber  2 C is held in accommodation chamber  2 C while outer peripheral surface  3 D 1  of connecting part  3 D is pressed against first surface portion  7 A 1 . In this state, accommodation chamber  2 C moves along the first direction A through a region in which a magnetic field becomes stronger along the first direction A in the first region. Thus, magnetocaloric member  1  accommodated in accommodation chamber  2 C produces heat, and heat transport medium HM held in accommodation chamber  2 C is heated by magnetocaloric member  1 . 
     With the rotation, accommodation chamber  2 C disposed in the first region moves to the third region. Outer peripheral surface  3 D 1  of connecting part  31 ) is guided by the sixth surface portion of second inner peripheral surface  7 A to reach third surface portion  7 A 3 . When outer peripheral surface  3 D 1  of connecting part  3 D is guided to the sixth surface portion, the volume of accommodation chamber  2 C gradually decreases. That is, the volume of accommodation chamber  2 C decreases in a region facing first outlet P 2  in the first region. Thus, heat transport medium HM (see  FIG.  1   ) heated as described above flows out to first outlet P 2  from the inside of accommodation chamber  2 C. 
     When accommodation chamber  2 C is located in the third region of casing  4 , outer peripheral surface  3 D 1  of connecting part  3 D is pressed by first elastic part  3 C against third surface portion  7 A 3 , so that movable part  3 B is positioned on the outside of the center in the radial direction B of magnetocaloric member  1  in the accommodation chamber  2 C. The volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against third sur ice portion  7 A 3  is smaller than the volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against first surface portion  7 A 1 . 
     Accommodation chamber  2 C moves through the third region in the first direction A, so that magnetocaloric member  1  accommodated in accommodation chamber  2 C moves along the first direction A through a region in which the magnetic field becomes weaker along the first direction A. Thus, magnetocaloric member  1  absorbs heat. 
     With the rotation, accommodation chamber  2 C disposed in the third region moves to the fourth region. Outer peripheral surface  3 D 1  of connecting part  3 D is guided by the seventh surface portion of second inner peripheral surface  7 A to reach fourth surface portion  7 A 4 . When outer peripheral surface  3 D 1  of connecting part  3 D is guided to the seventh surface portion, the volume of accommodation chamber  2 C gradually increases. That is, the volume of accommodation chamber  2 C increases in a region facing second inlet P 3  in the fourth region. Thus, heat transport medium HM (see  FIG.  1   ) flows into accommodation chamber  2 C through second inlet P 3 . 
     When accommodation chamber  2 C is disposed in the first region of casing  4 , outer peripheral surface  3 D 1  of connecting part  3 D is pressed by first elastic part  3 C against fourth surface portion  7 A 4 , so that movable part  3 B is positioned on the inside of the center in the radial direction B of magnetocaloric member  4  in the accommodation chamber  2 C. The volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against fourth surface portion  7 A 4  is larger than the volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against third surface portion  7 A 3 . 
     Heat transport medium HM flowing into accommodation chamber  2 C is held in accommodation chamber  2 C while outer peripheral surface  3 D 1  of connecting part  3 D is pressed against fourth surface portion  7 A 4 . In this state, since accommodation chamber  2 C moves along the first direction A through a region in which the magnetic field becomes weaker along the first direction A, magnetocaloric member  1  accommodated in accommodation chamber  2 C absorbs heat, and heat transport medium HM held in accommodation chamber  2 C is cooled by magnetocaloric member  1 . 
     With the rotation, accommodation chamber  2 C disposed in the fourth region moves to the second region. Outer peripheral surface  3 D 1  of connecting part  3 D is guided by the eighth surface portion of second inner peripheral surface  7 A to reach second surface portion  7 A 2 . When outer peripheral surface  3 D 1  of connecting part  3 D is guided to the eighth surface portion, the volume of accommodation chamber  2 C gradually decreases. That is, the volume of accommodation chamber  2 C decreases in a region facing second outlet P 4  in the fourth region. Thus, heat transport medium HM (see  FIG.  1   ) cooled as described above flows out to second outlet P 4  from the inside of accommodation chamber  2 C. 
     As described above, when accommodation chamber  2 C is disposed in the second region of casing  4 , outer peripheral surface  301  of connecting part  3 D is pressed by first elastic part  3 C against second surface portion  7 A 2 , so that movable part  38  is positioned on the outside of the center in the radial direction B of magnetocaloric member  1  in the accommodation chamber  2 C. The volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against second surface portion  7 A 2  is smaller than the volume of accommodation chamber  2 C when outer peripheral surface  3 D 1  of connecting part  3 D is pressed against fourth surface portion  7 A 4 . 
     The cycle of the increasing and decreasing volume of accommodation chamber  2 C is repeated while the rotation continues. Thus, magnetic heat pump  100  introduces the heat transport medium into the interior space through first inlet P 1 , heats the introduced heat transport medium, and discharges the heated heat transport medium to the outside through first outlet P 2 . At the same time, magnetic heat pump  100  introduces the heat transport medium into the interior space through second inlet P 3 , cools the introduced heat transport medium, and discharges the cooled heat transport medium to the outside through second outlet P 4 . 
     &lt;Configuration and Operation of Magnetic Refrigeration Cycle Apparatus&gt; 
     As illustrated in  FIG.  6   , a magnetic refrigeration cycle apparatus  200  according to the first embodiment mainly includes magnetic heat pump  100 , a first channel  21 , and a second channel  22 . In magnetic refrigeration cycle apparatus  200 , the interior of magnetic heat pump  100  first channel  21 , and second channel  22  is filled with a heat transport medium. 
     First channel  21  has one end connected to first inlet P 1  of magnetic heat pump  100  and the other end connected to first outlet P 2  of magnetic heat pump  100 . First channel  21  includes, for example, a first heat exchanger  23 . The heat transport medium heated by magnetic heat pump  100  is discharged to first channel  21  through first outlet P 2  by magnetic heat pump  100  and cooled by exchanging heat with another heat transport medium such as air in first heat exchanger  23 . The heat transport medium cooled in first heat exchanger  23  is introduced into magnetic heat pump  100  from first channel  21  through first inlet P 1 . 
     Second channel  22  has one end connected to second inlet P 3  of magnetic heat pump  100  and the other end connected to second outlet P 4  of magnetic heat pump  100 . Second channel  22  includes, for example, a second heat exchanger  24 . The heat transport medium cooled by magnetic heat pump  100  is discharged to second channel  22  through second outlet P 4  by magnetic heat pump  100  and heated by exchanging heat with another heat transport medium such as air in second exchanger  24 . The heat transport medium heated in second heat exchanger  24  is introduced into magnetic heat pump  100  from second channel  22  through second inlet P 3 . 
     &lt;Operation Effects&gt; 
     Magnetic heat pump  100  includes a plurality of magnetocaloric members  1 , impeller  2 , a plurality of deformable members  3 , casing  4 , electric motor  5 , and magnetic field generator  6 . Each of magnetocaloric members  1  is made of a magnetocaloric material. Impeller  2  has center axis CA and a plurality of accommodation chambers  2 C aligned in a circumferential direction with respect to the center axis and each accommodating a corresponding one of magnetocaloric members  1 . Deformable members  3  face each of accommodation chambers  2 C and have the shape individually changing. Casing  4  has an interior space accommodating magnetocaloric members  1 , impeller  2 , and deformable members  3  and allowing a heat transport medium to circulate, first inlet P 1  for the heat transport medium to flow into the interior space, and first outlet P 2  spaced apart from first inlet P 1  in the circumferential direction and for the heat transport medium to flow out of the interior space. 
     Electric motor  5  rotates magnetocaloric members  1 , impeller  2 , and deformable members  3  integrally in the first direction A. Magnetic field generator  6  produces a magnetic field becoming stronger along the first direction A in the first region of the interior space. 
     Accommodation chambers  2 C are open toward the outside in the radial direction  13 . The shapes of deformable members  3  individually change with rotation. The volume of each of accommodation chambers  2 C individually increases and decreases with change in shape of each of deformable members  3 . The volume when each accommodation chamber  2 C is located in the first region extending from first inlet P 1  to first outlet P 2  in the first direction A is larger than the volume when each accommodation chamber  2 C is located in the second region located on the back side of first inlet P 1  in the first direction A and the volume when each accommodation chamber  2 C is located in the third region located on the front side of first outlet P 2  in the first direction A. 
     In such a magnetic heat pump  100 , the action as a pump for discharging the heat transport medium and the action of changing the strength of a magnetic field to which magnetocaloric member  1  is exposed to develop a magnetocaloric effect are simultaneously achieved by a driving force of a single electric motor  5 . 
     Specifically, when each accommodation chamber  2 C moves from the second region to the first region with the rotation, the volume of the accommodation chamber  2 C increases. The heat transport medium therefore flows into the accommodation chamber  2 C through first inlet P 1 . 
     Further, in magnetic heat pump  100 , magnetocaloric member  1  in the first region produces heat, and heat transport medium HM held in accommodation chamber  2 C is heated by magnetocaloric member  1 . 
     Further, in magnetic heat pump  100 , when each accommodation chamber  2 C moves from the first region to the third region with the rotation, the volume of accommodation chamber  2 C decreases. The heated heat transport medium therefore flows out of accommodation chamber  2 C to first outlet P 2 . 
     As a result, magnetic heat pump  100  can heat the heat transport medium by the magnetocaloric effect and discharge the heated heat transport medium. Magnetic refrigeration cycle apparatus  200  including magnetic heat pump  100  therefore can save the power of a pump disposed outside the magnetic heat pump in a conventional magnetic refrigeration cycle apparatus or can eliminate the need of the pump. 
     In magnetic heat pump  100 , each of deformable members  3  includes movable part  3 B that moves relative to magnetocaloric member  1  in the radial direction B in the interior of each accommodation chamber  2 C, Magnetic heat pump  100  has a fixed position relative to casing  4  and further includes guide member  7  that guides movable part  311  moving in the circumferential direction with the rotation in the radial direction B. 
     Casing  4  has first inner peripheral surface  4 A facing the interior space and facing the inside in the radial direction B. The volume of each accommodation chamber  2 C is the volume of a space located on the outside of movable part  3 B in the radial direction B in the accommodation chamber  2 C. The distance in the radial direction B between movable part  3 B and first inner peripheral surface  4 A when movable part  3 B is located in the first region is longer than the distance in the radial direction B between movable part  3 B and first inner peripheral surface  4 A when movable part  3 B is located in the second region or the third region. 
     In this configuration, each movable part  311  moves in the radial direction. B with the rotation to increase or decrease the volume of each accommodation chamber  2 C as described above. The movement of each movable part  3 B in the radial direction B achieved only by a driving force applied by electric motor  5  to each movable part  3 B. Magnetic heat pump  100  therefore can be reduced in size compared with when movable part  3 B is moved in the radial direction B by a driving force applied by a drive source other than electric motor  5 . 
     In magnetic heat pump  100 , each of deformable members  3  further includes stationary part  3 A fixed relative to the corresponding magnetocaloric member  1 , and first elastic part  3 C having a first end portion connected to stationary part  3 A and a second end portion connected to the movable part and located on the side opposite to the first end portion and elastically deformed in the radial direction. Guide member  7  has second inner peripheral surface  7 A facing the inside in the radial direction B. Movable part  3 B is pressed by first elastic part  3 C against second inner peripheral surface  7 A of guide member  7 . Second inner peripheral surface  7 A of the guide member has first surface portion  7 A  1  disposed in the first region, second surface portion  7 A 2  disposed in the second region, and third surface portion  7 A 3  disposed in the third region. 
     The distance in the radial direction B between first surface portion  7 A 1  and first inner peripheral surface  4 A is longer than the distance in the radial direction B between second surface portion  7 A 2  and first inner peripheral surface  4 A and the distance in the radial direction B between third surface portion  7 A 3  and first inner peripheral surface  4 A. 
     With this configuration, since the position in the radial direction B of movable part  3 B is defined by first elastic part  3 C, increase and decrease of the volume with the rotation is performed more reliably. 
     In magnetic heat pump  100 , each of magnetocaloric members  1  has at least one slit  1 A extending along the extending direction C and the radial direction B. Each movable part  3 B has a portion inserted in slit  1 A. 
     The area of a heat transfer surface in contact with the heat transport medium in each magnetocaloric member  1  having at least one slit  1 A is larger than the area of a heat transfer surface in contact with the heat transport medium in each magnetocaloric member  1  having no slit  1 A. The area of the heat transfer surface increases as the number of slits  1 A formed in each magnetocaloric member  1  increases. As the area of the heat transfer surface increases, heat is more easily transferred between each magnetocaloric member  1  and the heat transport medium. 
     In magnetic heat pump  100 , easing  4  further has second inlet P 3  for the heat transport medium to flow into the interior space and second outlet P 4  spaced apart from second inlet P 3  in the circumferential direction and for the heat transport medium to flow out of the interior space. Second inlet P 3  is disposed on the front side of first outlet. P 2  in the first direction A. Second outlet P 4  is disposed on the front side of second inlet. P 3  in the first direction A. Magnetic field generator  6  produces a stronger magnetic field in at least a part of the third region than in the fourth region. The volume when located in the fourth region extending from second inlet P 3  to second outlet P 4  in the first direction A is larger than the volume when each accommodation chamber  2 C is located in the second region located on the back side of first inlet P 1  in the first direction A and the volume when each accommodation chamber  2 C is located in the third region located on the front side of first outlet P 2  in the first direction A. 
     With this configuration, in magnetic heat pump  100 , when each accommodation chamber  2 C moves from the third region to the fourth region with the rotation, the volume of the accommodation chamber  2 C increases. The heat transport medium therefore flows into the accommodation chamber  2 C through second inlet P 3 . 
     Further, in magnetic heat pump  100 , magnetocaloric member  1  in the fourth region absorbs heat, and heat transport medium HM held in accommodation chamber  2 C is cooled by magnetocaloric member  1 . 
     Further, in magnetic heat pump  100 , when each accommodation chamber  2 C moves from the fourth region to the second region with the rotation, the volume of the accommodation chamber  2 C decreases. The cooled heat transport medium therefore flows out of the accommodation chamber  2 C to second outlet P 4 . 
     As a result, magnetic heat pump  100  can heat the heat transport medium by the magnetocaloric effect and discharge the heated heat transport medium and can cool the heat transport medium by the magnetocaloric effect and discharge the cooled heat transport medium. Magnetic refrigeration cycle apparatus  200  including magnetic heat pump  100  therefore can save the power of a pump disposed outside the magnetic heat pump in a conventional magnetic refrigeration cycle apparatus or can eliminate the need of the pump. 
     Magnetic refrigeration cycle apparatus  200  includes magnetic heat pump  100 , first channel  21 , and second channel  22 . First channel  21  has one end connected to first inlet P 1  of magnetic heat pump  100  and the other end connected to first outlet P 2  and allows the heat transport medium to flow. Second channel  22  has one end connected to second inlet P 3  and the other end connected to second outlet P 4  and allows the heat transport medium to flow. First channel  21  includes, for example, first heat exchanger  23 . Second channel  22  includes, for example, second heat exchanger  24 . 
     In magnetic refrigeration cycle apparatus  200 , the heat transport medium heated by magnetic heat pump  100  is cooled by exchanging heat with another heat transport medium in first heat exchanger  23 . The heat transport medium cooled in first heat exchanger  23  is introduced into magnetic heat pump  100 . Further, the heat transport medium cooled by magnetic heat pump  100  is heated by exchanging heat with another heat transport medium in second heat exchanger  24 . The heat transport medium heated in second heat exchanger  24  is introduced into magnetic heat pump  100 . The refrigeration cycle described above is repeated while magnetic refrigeration cycle apparatus  200  is driven. Since magnetic heat pump  100  serves as a pump fir feeding the heat transport medium, magnetic refrigeration cycle apparatus  200  can save the power of a pump disposed outside the magnetic heat pump in a conventional magnetic refrigeration cycle apparatus or can eliminate the need of the pump. 
     Second Embodiment 
     As illustrated in  FIG.  7   , a magnetic heat pump  101  according to a second embodiment basically has a configuration similar to magnetic heat pump  100  according to the first embodiment but differs from magnetic heat pump  100  in that casing  4  does not have second inlet P 3  and second outlet P 4 . 
     Second inner peripheral surface  7 A of guide member  7  at least has first surface portion  7 A 1 , second surface portion  7 A 2 , and third surface portion  7 A 3 . Second inner peripheral surface  7 A, for example, does not have fourth surface portion  7 A 4 . In this case, second surface portion  7 A 2  and third surface portion  7 A 3  may be formed integrally. 
     Electric motor  5  rotates magnetocaloric members  1 , impeller  2 , and deformable members  3  in the first direction A. Magnetic field generator  6  includes at least one of permanent magnets, electromagnets, and superconducting magnets whose position relative to casing  4  is variable. 
     As illustrated in  FIG.  8   , magnetic refrigeration cycle apparatus  201  according to the second embodiment basically has a configuration similar to magnetic refrigeration cycle apparatus  200  according to the first embodiment but differs from magnetic refrigeration cycle apparatus  200  in that it includes a first channel  31  and a second channel  32 , and a plurality of valves  33 ,  34 ,  35 , and  36  as switches, instead of first channel  21  and second channel  22 . 
     Each of first channel  31  and second channel  32  connects first inlet P 1  and first outlet P 2 . First channel  31  and second channel  32  are connected to first inlet P 1  and first outlet P 2  in parallel with each other. First channel  31  includes first heat exchanger  23 . Second channel  32  includes second heat exchanger  24 . 
     Specifically, first inlet P 1  is connected to a first opening of a branch line  29  having first to third openings. First outlet P 2  is connected to a first opening of a branch line  30  having first to third openings. The second opening of branch line  29  is connected in series to the second opening of branch line  30  through first heat exchanger  23 . The third opening of branch line  29  is connected to the third opening of branch line  30  through second heat exchanger  24 . 
     A plurality of valves  33 ,  34 ,  35 , and  36  switch between a first state in which magnetic heat pump  101  is connected to first channel  31  and not connected to second channel  32  and a second state in which the magnetic heat pump is connected to second channel  32  and not connected to first channel  31 . 
     First channel  31  includes valve  33  and valve  34 . Valve  33  is disposed between the second opening of branch line  29  and first heat exchanger  23  in first channel  31 . Valve  34  is disposed between the second opening of branch line  30  and first heat exchanger  23  in first channel  31 . Valve  33  and valve  34  are simultaneously opened or closed. 
     Second channel  32  includes valve  35  and valve  36 . Valve  35  is disposed between the third opening of branch line  29  and second heat exchanger  24  in second channel  32 . Valve  36  is disposed between the third opening of branch line  30  and second heat exchanger  24  in second channel  32 . Valve  35  and valve  36  are simultaneously opened or closed. Valve  33  and valve  34 , and valve  35  and valve  36  are alternately opened or closed. That is, a state in which valve  33  and valve  34  are opened and valve  35  and valve  36  are closed and a state in which valve  33  and valve  34  are closed and valve  35  and valve  36  are opened are alternately switched. 
     Magnetic heat pump  101  of in refrigeration cycle apparatus  201  is driven in the same manner as magnetic heat pump  100  of magnetic refrigeration cycle apparatus  200 . 
     In a state in which valve  33  and valve  34  are opened and valve  35  and valve  36  are closed, magnetic field generator  6  forms a magnetic field gradually stronger along first direction A in the first region, so that the heat transport medium heated in magnetic heat pump  101  is supplied to first heat exchanger  23 . 
     Subsequently, a state in which valve  33  and valve  34  are closed and valve  33  and valve  36  are opened is brought about. In this state, magnetic field generator  6  forms a magnetic field gradually weaker along first direction A in the first region, so that the heat transport medium cooled in magnetic heat pump  101  is supplied to second heat exchanger  24 . 
     Electric motor  5  may alternately switch between a state in which magnetocaloric member  1 , impeller  2 , and deformable member  3  are rotated in the first direction A and a state in which magnetocaloric members  1 , impeller  2  and deformable members  3  are rotated in a direction opposite to the first direction A. The switching is performed when the number of rotations in each state is at least one or more. Magnetic field generator  6  in this case need to form only a magnetic field becoming stronger along first direction A in the first region. Magnetic field generator  6  may include a permanent magnet having a fixed position relative to casing  4 . In this ease, in a state in which magnetocaloric members  1 , impeller  2 , and deformable members  3  are rotated in a direction opposite to first direction A, first outlet P 2  functions as an inlet through which the heat transport medium flows in, and first inlet P 1  functions as an outlet through which the heat transport medium flows out. 
     Third Embodiment 
     As illustrated in  FIG.  9    and  FIG.  10   , a magnetic heat pump  102  according to a third embodiment basically has a configuration similar to magnetic heat pump  100  according to the first embodiment but differs from magnetic heat pump  100  in that it includes a plurality of deformable members  13  dividing accommodation chambers  2 C instead of deformable members  3 . 
     As illustrated in  FIG.  9   , magnetic heat pump  101  mainly includes a plurality of magnetocaloric members  11 , an impeller  12 , a plurality of deformable members  13 , a casing  14 , an electric motor  15 , and a magnetic field generator  16 . Each of magnetocaloric members  11 , impeller  12 , deformable members  13 , casing  14 , electric motor  15 , and magnetic field generator  16  basically has a configuration similar to a corresponding one of magnetocaloric members  1 , impeller  2 , deformable members  3 , casing  4 , electric motor  5 , and magnetic field generator  6  of magnetic heat pump  100 . 
     As illustrated in  FIG.  10   , each of magnetocaloric members  11  has, for example, at least one slit  11 A. Slits  11 A are, for example, aligned in the extending direction C and extend along the radial direction B and the circumferential direction. In other words, each of magnetocaloric members  11  has a pair of surfaces opposed to each other in the extending direction C. The spacing in the extending direction C between slits  1 A is constant, for example, irrespective of the position in the radial direction B. Slits  11 A may be configured in the same manner as slits  1 A. 
     Each of magnetocaloric members  11  has, for example, a plurality of slits  11 A. Slits  11 A are, for example, aligned in the extending direction C and each extend along the radial direction B and the circumferential direction. In other words, each of magnetocaloric members  11  has a plurality of pairs of surfaces opposed to each other in the extending direction C. Any number of slits  11 A may be formed in one magnetocaloric member  1 . 
     Impeller  12  has a central part  12 A and a plurality of accommodation chambers  12 C each accommodating one of magnetocaloric members  11 . Accommodation chambers  12 C are divided by each of deformable members  13 . In other words, each of deformable members  13  is formed as a vane of impeller  12 . 
     The configurations of accommodation chambers  12 C are, for example, equal to each other. Each of accommodation chambers  12 C has a bottom surface facing the outside in the radial direction  13 , a side surface facing the front side in the first direction A, and a side surface facing the back side in the first direction A. The bottom surface of each of accommodation chambers  12 C is formed with, for example, outer peripheral surface  12 B of central pan  12 A. An end portion located on the inside in the radial direction B of each magnetocaloric member  11  is fixed to the bottom surface of the corresponding one of accommodation chambers  12 C. The side surface of each of accommodation chambers  12 C is thrilled with a side surface of a corresponding one of deformable members  13 . The side surface of each of accommodation chambers  12 C is, for example, in contact with a corresponding one magnetocaloric members  11  in the circumferential direction. 
     Each of accommodation chambers  12 C is open toward the outside in the radial direction B, The spacing in the circumferential direction between accommodation chambers  12 C is, for example, gradually wider from the inside toward the outside in the radial direction B. 
     Deformable members  13  each include an inner peripheral portion  13 A disposed on the inside in the radial direction B and an outer peripheral portion  13 B disposed on the outside of inner peripheral portion  13 A in the radial direction Band elastically deformed relative to inner peripheral portion  13 A. 
     Inner peripheral portion  13 A of each of deformable members  13  is disposed between two magnetocaloric members  11  adjacent to each other in the circumferential direction. Each inner peripheral portion  13 A is, for example, in contact with two magnetocaloric members  11  adjacent to each other in the circumferential direction. Outer peripheral portion  13 B of each of deformable members  13  is connected to inner peripheral portion  13 A. Each outer peripheral portion  13 B is disposed on the outside of the corresponding magnetocaloric member  11  in the radial direction B. 
     In a state in which no external force is applied to each deformable member  13  as viewed from the extending direction C, each deformable member  13  has, for example, a lengthwise direction along the radial direction and a crosswise direction along the circumferential direction. 
     Casing  14  has a first inner peripheral surface  14 A facing the interior space and facing the inside in the radial direction  13 . In magnetic heat pump  102 , first inner peripheral surface  14 A of casing  14  plays the same role as second inner peripheral surface  7 A of guide member  7  in magnetic heat pump  100 . 
     First inner peripheral surface  14 A of casing  14  has a ninth surface portion  14 A 1  (fourth portion) disposed in the first region, a tenth surface portion  14 A 2  (fifth portion) disposed in the second region, an eleventh surface portion  14 A 3  (sixth portion) disposed in the third region, and a twelfth surface portion  14 A 4  disposed in the fourth region. 
     The distance in the radial direction B between ninth surface portion  14 A 1  and inner peripheral portion  13 A is longer than the distance in the radial direction B between tenth surface portion  14 A 2  and inner peripheral portion  13 A and the distance in the radial direction B between eleventh surface portion  14 A 3  and inner peripheral portion  13 A, The distance in the radial direction B between twelfth surface portion  14 A 4  and inner peripheral portion  13 A is longer than the distance in the radial direction  13  between tenth surface portion  14 A 2  and inner peripheral portion  13 A and the distance in the radial direction B between eleventh surface portion  14 A 3  and inner peripheral portion  13 A. 
     The distance in the radial direction B between ninth surface portion  14 A 1  and inner peripheral portion  13 A is, for example, equal to the distance in the radial direction B between twelfth surface portion  14 A 4  and inner peripheral portion  13 A. The distance in the radial direction B between tenth surface portion  14 A 2  and inner peripheral portion  13 A is, for example, equal to the distance in the radial direction B between eleventh surface portion  14 A 3  and inner peripheral portion  13 A. 
     Distance LH 1  in the radial direction B between ninth surface portion  14 A 1  and magnetocaloric member  11  is longer than distance LH 2  in the radial direction B between tenth surface portion  14 A 2  and magnetocaloric member  11  and distance LID in the radial direction B between eleventh surface portion  14 A 3  and magnetocaloric member  11 . The distance in the radial direction B between twelfth surface portion  14 A 4  and magnetocaloric member  11  is longer than the distance in the radial direction B between tenth surface portion  14 A 2  and magnetocaloric member  11  and the distance in the radial direction B between eleventh surface portion  14 A 3  and magnetocaloric member  11 . 
     The distance in the radial direction B between ninth surface portion  14 A 1  and magnetocaloric member  11  is, for example, equal to the distance in the radial direction B between twelfth snake portion  14 A 4  and magnetocaloric member  11 . The distance in the radial direction B between tenth surface portion  14 A 2  and magnetocaloric member  11  is, for example, equal to the distance in the radial direction B between eleventh surface portion  14 A 3  and magnetocaloric member  11 . 
     Outer peripheral portion  13 B of each of deformable members  13  is provided in contact with at least each of tenth surface portion  14 A 2  and eleventh surface portion  14 A 3 . For example, in a state in which no external force is applied to each deformable member  13 , the surface of outer peripheral portion  13 B that faces the front side in the first direction A is in contact with each of tenth surface portion  14 A 2  and eleventh surface portion  14 A 3 . Thus, each accommodation chamber  12 C located in the second region and the third region is hermetically scaled by impeller  12 , deformable members  13 , and casing  14 . 
     Preferably, outer peripheral portion  13 B of each of deformable members  13  is provided also in contact with each of ninth surface portion  14 A 1  and twelfth surface portion  14 A 4 . For example, in a state in which no external force is applied to each deformable member  13 , the surface of outer peripheral portion  13 B that faces the outside in the radial direction B is in contact with each of ninth surface portion  14 A 1  and twelfth surface portion  14 A 4 . Thus, each of accommodation chambers  12 C is hermetically sealed by impeller  12 , deformable members  13 , and casing  14 . 
     The length in the radial direction B of outer peripheral portion  13 B when each of deformable members  13  is located in the first region is longer than the length in the radial direction B of outer peripheral portion  13 B when the deformable member  13  is located in the second region and the length in the radial direction B of outer peripheral portion  13 B when the deformable member  13  is located in the third region. 
     When each of deformable members  13  is located in the second region and the third region, outer peripheral portion  13 B of each deformable member  3  is flexed relative to inner peripheral portion  13 A. When each of deformable members  13  is located in the first region and the fourth region, outer peripheral portion  13 B of each deformable member  3  is not flexed, for example, relative to inner peripheral portion  13 A. When each of deformable members  13  is located in the first region and the fourth region, outer peripheral portion  13 B of each deformable member  3  may be flexed, for example, relative to inner peripheral portion  13 A. 
     As viewed from the extending direction C, the angle formed between inner peripheral portion  13 A and outer peripheral portion  13 B of each deformable member  13  is called a flex angle of the deformable member  13 , The flex angle of each deformable member  13  disposed in the first region is greater than the flex angle of each deformable member  13  disposed in the second region and the flex angle of each deformable member  13  disposed in the third region. The flex angle of each deformable member  13  disposed in the first region is, for example, 150 degrees to ISO degrees. The flex angle of each deformable member  13  disposed in the second region and the flex angle of each deformable member  13  disposed in the third region is, for example, 80 degrees to 110 degrees. 
     Each of accommodation chambers  12 C is defined as a space located between two deformable members  13  adjacent to each other in the circumferential direction and located on the inside of first inner peripheral surface  14 A of casing  14  in the radial direction B. The volume of each of accommodation chambers  12 C changes depending on in which of the first region, the second region, the third region, and the fourth region each accommodation chamber  12 C is located. 
     The volume when each of accommodation chambers  12 C is located in the first region is larger than the volume when each of accommodation chambers  12 C is located in the second region and the volume when it is located in the third region. The volume when each of accommodation chambers  12 C is located in the fourth region is larger than the volume when each of accommodation chambers  12 C is located in the second region and the volume when it is located in the third region. That is, the volume of each of accommodation chambers  12 C increases and decreases with the rotation. 
     The volume when each of accommodation chambers  12 C is located in the first region is, for example, equal to the volume when each of accommodation chambers  12 C is located in the fourth region. The volume when each of accommodation chambers  12 C is located in the second region is, for example, equal to the volume when each of accommodation chambers  12 C is located in the third region. 
     &lt;Operation of Magnetic Heat Pump&gt; 
     The operation of magnetic heat pump  102  is basically the same as the operation of magnetic heat pump  100 . In operation of magnetic heat pomp  102 , magnetocaloric members  11 , impeller  12 , and deformable members  13  rotate in the first direction A, so that the position of each of magnetocaloric members  11 , impeller  12 , and deformable members  13  relative to casing  14  changes. Further, in operation of magnetic heat pump  102 , magnetic field generator  16  produces the magnetic field described above. 
     When accommodation chamber  12 C is located in the second region of casing  14 , outer peripheral portion  13 B of deformable member  13  facing the accommodation chamber  12 C comes into contact With tenth surface portion  14 A 2  of first inner peripheral surface  14 A of casing  14  and undergoes external force to be bent relative to inner peripheral portion  13 A. The volume of accommodation chamber  12 C when outer peripheral portion  13 B is in contact with tenth surface portion  14 A 2  is relatively small. 
     With the rotation, accommodation chamber  12 C disposed in the second region moves to the first region. When outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C reaches a region facing first inlet P 1  in the first region, the outer peripheral portion  13 B is no longer in contact with tenth surface portion  14 A 2 , and the external force applied, to the outer peripheral portion  13 B in the second region is removed. This eliminates a state in which outer peripheral portion  13 B is elastically deformed and bent relative to inner peripheral portion  13 A. 
     Thus, the volume of accommodation chamber  12 C when outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C is disposed in a region facing first inlet P 1  in the first region is larger than the volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with tenth surface portion  14 A 2 . That is, the volume of accommodation chamber  12 C increases in a region facing first inlet P 1  in the first region. Further, since accommodation chamber  12 C disposed in the second region is hermetically sealed, a negative pressure is built up in accommodation chamber  12 C with increase of the volume. As a result, heat transport medium HM (sec  FIG.  9   ) flows into accommodation chamber  12 C through first inlet P 1 . 
     Subsequently, outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C comes into contact with ninth surface portion  14 A 1 . The volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with ninth surface portion  14 A 1  is larger than the volume of accommodation chamber  12 C when two outer peripheral portions  13 B disposed to sandwich accommodation chamber  12 C are in contact with tenth surface portion  14 A 2 . 
     Heat transport medium HM flowing into accommodation chamber  12 C is held in accommodation chamber  12 C while outer peripheral portion  13 B is in contact with ninth surface portion  14 A 1 . In this state, accommodation chamber  12 C moves along the first direction A through a region in which a magnetic field becomes stronger along the first direction A in the first region. Thus, magnetocaloric member  11  accommodated in accommodation chamber  12 C produces heat, and heat transport medium held in accommodation chamber  12 C is heated by magnetocaloric member  11 . 
     With the rotation, accommodation chamber  12 C disposed in the first region moves to the third region. When outer peripheral portion  13 B of deformable member  13  disposed on the front side in the first direction A relative to accommodation chamber  12 C reaches the third region, outer peripheral portion  13 B comes into contact with eleventh surface portion  14 A 3  and is bent again relative to inner peripheral portion  13 A. 
     Thus, the volume of accommodation chamber  12 C when outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C is in contact with eleventh surface portion  14 A 3  is smaller than the volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with ninth surface portion  14 A 1 . That is, the volume of accommodation chamber  12 C decreases in a region facing first outlet P 2  in the first region. Further, since accommodation chamber  12 C disposed in the first region is hermetically sealed, a positive pressure is built up in accommodation chamber  12 C with decrease of the volume. As a result, heat transport medium HM (see  FIG.  8   ) flows out to first outlet P 2  from the inside of accommodation chamber  12 C. 
     Accommodation chamber  12 C moves through the third region in the first direction A, so that magnetocaloric member  11  accommodated in the accommodation chamber  12 C moves along the first direction A through a region in which the magnetic field becomes weaker along the first direction A. Thus, magnetocaloric member  11  absorbs heat. 
     With the rotation, accommodation chamber  12 C disposed in the third region moves to the fourth region. When outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C reaches a region facing second inlet P 3  in the fourth region, the outer peripheral portion  13 B is no longer in contact with eleventh surface portion  14 A 3 , and the external force applied to the outer peripheral portion  13 B in the third region is removed. This eliminates a state in which outer peripheral portion  13 B is elastically deformed and bent relative to inner peripheral portion  13 A. 
     Thus, the volume of accommodation chamber  12 C when outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C is disposed in a region facing second inlet P 3  in the fourth region is larger than the volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with eleventh surface portion  14 A 3 . That is, the volume of accommodation chamber  12 C increases in a region facing second inlet P 3  in the fourth region. Further, since accommodation chamber  12 C disposed in the third region is hermetically sealed, a negative pressure is built up in accommodation chamber  12 C with increase of the volume. As a result, heat transport medium HM (see  FIG.  8   ) flows into accommodation chamber  12 C through second inlet P 3 . 
     Subsequently, outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C comes into contact with twelfth surface portion  14 A 4 . The volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with twelfth surface portion  14 A 4  is larger than the volume of accommodation chamber  12 C when two outer peripheral portions  138  disposed to sandwich accommodation chamber  12 C are in contact with eleventh surface portion  14 A 3 . 
     Heat, transport medium HM flowing into accommodation chamber  12 C is held in accommodation chamber  12 C while outer peripheral portion  13 B is in contact with twelfth surface portion  14 A 4 , in this state, since accommodation chamber  12 C moves along, the first direction A through a region in which the magnetic field becomes weaker along the first direction A, magnetocaloric member  11  accommodated in accommodation chamber  12 C absorbs heat, and heat transport medium HM held in accommodation chamber  12 C is cooled by magnetocaloric member  11 . 
     With the rotation, accommodation chamber  12 C disposed in the fourth region moves to the second region. When outer peripheral portion  13 B of deformable member  13  disposed on the front side in the first direction A relative to accommodation chamber  12 C reaches the second region, outer peripheral portion  13 B comes into contact with tenth surface portion  14 A 2  and is bent again relative to inner peripheral portion  13 A. 
     Thus, the volume of accommodation chamber  12 C when outer peripheral portion  13 B disposed on the front side in the first direction A relative to accommodation chamber  12 C is in contact with tenth surface portion  14 A 2  is smaller than the volume of accommodation chamber  12 C when the outer peripheral portion  13 B is in contact with twelfth surface portion  14 A 4 . That is, the volume of accommodation chamber  12 C decreases in a region facing second outlet P 4  in the fourth region. Further, since accommodation chamber  12 C disposed in the fourth region is hermetically sealed, a positive pressure is built up in accommodation chamber  12 C with decrease of the volume. As a result, heat transport medium HM (see  FIG.  8   ) flows out to second outlet. P 4  from the inside of accommodation chamber  12 C. 
     The cycle of the increasing and decreasing volume of accommodation chamber  12 C is repeated while the rotation continues. Thus, magnetic heat pump  102  introduces the heat transport medium into the interior space through first inlet P 1 , heats the introduced heat transport medium, and discharges the heated heat transport medium to the outside through first outlet P 2 . At the same time, magnetic heat pump  102  introduces the heat transport medium into the interior space through second inlet P 3 , cools the introduced heat transport medium, and discharges the cooled heat transport medium to the outside through second outlet P 4 . 
     A magnetic refrigeration cycle apparatus including magnetic heat pump  102  has a configuration similar to magnetic refrigeration cycle apparatus  200  including magnetic heat pump  100 . 
     &lt;Operation Effects&gt; 
     Magnetic heat pump  102  basically has a configuration similar to magnetic heat pump  100  and achieve effects similar to those of magnetic heat pump  100 , Further, in magnetic heat pump  102 , deformable members  13  achieve an effect similar to that of each of vanes  2 B and deformable members  3  in magnetic heat pump  100 , and casing  14  achieves an effect similar to that of guide member  7  in magnetic heat pump  100 . The number of components of magnetic heat pump  102  therefore can be reduced compared with the number of components or magnetic heat pump  100 . 
     In magnetic heat pump  102 , similar to magnetic heat pump  101 , second inlet P 3  and second outlet P 4  need not be formed in easing  4 , In this case, the magnetic refrigeration cycle apparatus including magnetic heat pump  102  may have a configuration similar to magnetic refrigeration cycle apparatus  201  including magnetic heat pump  101 . 
     Fourth Embodiment 
     As illustrated in  FIG.  11   , a magnetic refrigeration cycle apparatus  202  according to a fourth embodiment basically has a configuration similar to magnetic refrigeration cycle apparatus  200  according to the first embodiment but differs from magnetic refrigeration cycle apparatus  200  in that first channel  21  further includes a thermal storage tank  25 . 
     Thermal storage tank  25  is configured to store thermal energy of a heat transport medium. Thermal storage tank  25  has, for example, a reservoir for storing a heat transport medium, a heat insulator disposed around the reservoir to thermally insulate the reservoir, and four inlets/outlets for the heat transport medium to flow into the reservoir or flow out of the reservoir. 
     First channel  21  includes fast heat exchanger  23 , thermal storage tank  25 , a first line  21 A, a second line  21 B, a pump  26 , a first valve  27 , and a second valve  28 . 
     First line  21 A connects first inlet P 1  and first outlet P 2  of magnetic heat pump  100  to two inlets/outlets of thermal storage tank  25 . Second line  21 B connects the other two inlets/outlets of thermal storage tank  25  to first heat exchanger  23 . 
     Pump  26  feeds the heat transport medium from thermal storage tank  25  to first heat exchanger  23  in second fine  21 B. 
     First valve  27  is disposed between thermal storage tank  25  and first heat exchanger  23  in second line  21 B to open or close a flow of the heat transport medium between thermal storage tank  25  and first heat exchanger  23 . 
     Second valve  28  is disposed on the side opposite to first valve  27  with respect to thermal storage tank  25  in second line  21 B. Second valve  28  is disposed between thermal storage tank  25  and pump  26  in second line  21 B to open or close a flow of the heat transport medium between thermal storage tank  25  and first heat exchanger  23 . First valve  27  and second valve  28  are, for example, opened or closed simultaneously with each other. 
     In magnetic refrigeration cycle apparatus  202 , the interior of magnetic heat pump  100 , first channel  21 , and second channel  22  is filled with a heat transport medium. 
     Magnetic heat pump  100  of magnetic refrigeration cycle apparatus  202  is driven in the same manner as magnetic heat pump  100  of magnetic refrigeration cycle apparatus  200 . In second channel  22  of magnetic refrigeration cycle apparatus  202 , similar to second channel  22  of magnetic refrigeration cycle apparatus  200 , the heat transport medium cooled in magnetic heat pump  100  exchanges heat with another heat transport medium in second heat exchanger  24 . 
     In magnetic refrigeration cycle apparatus  202 , when first valve  27  and second valve  28  are closed in a state in which magnetic heat pump  100  is driven, the heat transport medium heated in magnetic heat pump  100  is stored in thermal storage tank  25 . The heat transport medium stored in thermal storage tank  25  is kept at a high temperature. Therefore, the larger the amount of heat transport medium stored in thermal storage tank  25 , the larger the amount of heat stored in thermal storage tank  25 . 
     Subsequently, when first valve  27  and second valve  28  are opened in a state in which magnetic heat pump  100  is driven, the heat transport medium stored in thermal storage tank  25  flows to first heat exchanger  23  and exchanges heat with another heat transport medium. 
     At this moment, the heat transport medium flowing through first heat exchanger  23  is hotter than the heat transport medium flowing through first heat exchanger  23  in magnetic refrigeration cycle apparatus  200  that does not include thermal storage tank  25 . The temperature difference between two heat transport media exchanging heat in first heat exchanger  23  in magnetic refrigeration cycle apparatus  202  is larger than in magnetic refrigeration cycle apparatus  200 . For example, even when heat exchange between two heat transport media is insufficient in first heat exchanger  23  in magnetic refrigeration cycle apparatus  200  due to a relatively high temperature of the other heat transport medium, heat exchange between two heat transport media exchanging heat in first heat exchanger  23  can be sufficiently performed in magnetic refrigeration cycle apparatus  202 . The performance of magnetic refrigeration cycle apparatus  202  is therefore higher than the performance of magnetic refrigeration cycle apparatus  200 . 
     In magnetic refrigeration cycle apparatus  202 , second channel  22  may include thermal storage tank  25 , pump  26 , first valve  27 , and second valve  28 . In this case, when first valve  27  and second valve  28  are closed in a state in which magnetic heat pump  100  is driven, the heat transport medium cooled in magnetic heat pump  100  is stored in thermal storage tank  25 . The heat transport medium stored in thermal storage tank  25  is kept at a low temperature. 
     Subsequently, when first valve  27  and second valve  28  are opened in a state in which magnetic heat pump  100  is driven, the heat transport medium stored in thermal storage tank  25  flows to second heat exchanger  24  and exchanges heat with another heat transport medium. 
     At this moment, the heat transport medium flowing through first heat exchanger  23  is colder than the heat transport medium flowing through second heat exchanger  24  in magnetic refrigeration cycle apparatus  200  that does not include thermal storage tank  25 . The temperature difference between two heat transport media exchanging heat in second heat exchanger  24  in magnetic refrigeration cycle apparatus  202  is larger than in magnetic refrigeration cycle apparatus  200 . 
     In magnetic refrigeration cycle apparatus  202 , at least one of first channel  21  and second channel  22  includes thermal storage tank.  25 , pump  26 , first valve  27 , and second valve  28 , Both of first channel  21  and second channel  22  may include thermal storage tank  25 , pump  26 , first valve  27 , and second valve  28 . 
     Magnetic refrigeration cycle apparatus  202  may include magnetic heat pump  102  instead of magnetic heat pump  100 . 
     Fifth Embodiment 
     As illustrated in  FIG.  12   , a magnetic refrigeration cycle apparatus  203  according to a fifth embodiment basically has a configuration similar to magnetic refrigeration cycle apparatus  200  according to the first embodiment but differs from magnetic refrigeration cycle apparatus  200  in that it includes a plurality of magnetic heat pumps  100  connected in series to each other and a controller  8  that controls the rotation of magnetic heat pumps  100 . 
     Of two magnetic heat pumps  100  illustrated in  FIG.  12   , magnetic heat pump  100  disposed on the right side is called first magnetic heat pump  100 , and magnetic heat pump  100  disposed on the left side is called second magnetic heat pump  100 . 
     First outlet P 2  of first magnetic heat pump  100  is connected in series to first inlet P 1  of second magnetic heat pump  100 . Second outlet P 4  of second magnetic heat pump  100  is connected in series to second inlet P 3  of first magnetic heat pump  100 . 
     Controller  8  controls the speed of the rotation in the first direction A of each of first magnetic heat pump  100  and second magnetic heat pump  100  such that the flow rate per unit time of the heat transport medium flowing out of first outlet P 2  of first magnetic heat pump  100  is equal to the flow rate per unit time of the heat transport medium flowing into first inlet P 1  of second magnetic heat pump  100 . With this control, the total amount of heat transport medium in the interior space of each of first magnetic heat pump  100  and second magnetic heat pump  100  is kept constant without changing over time. When first magnetic heat pump  100  has the same configuration as second magnetic heat pump  100 , controller  8  synchronizes the rotation in the first direction A of first magnetic heat pump  100  with the rotation in the first direction A of second magnetic heat pump  100 . 
     When the flow rate per unit time of the heat transport medium flowing out of first outlet P 2  of first magnetic heat pump  100  is different from the flow rate per unit time of the heat transport medium flowing into first inlet P 1  of second magnetic heat pump  100 , a pressure difference occurs between the heat transport medium in first magnetic heat pump  100  and the heat transport medium in second magnetic heat pump  100 , and the heat transport medium having a relatively high pressure may hinder the rotation. If the rotation is hindered, the performance of the magnetic refrigeration cycle apparatus is degraded. 
     In magnetic refrigeration cycle apparatus  203 , controller  8  maintains a state in which the flow rate per unit time of the heat transport medium flowing out of first outlet P 2  of first magnetic heat pump  100  is equal to the flow rate per unit time of the heat transport medium flowing into first inlet P 1  of second magnetic heat pump  100 . In magnetic refrigeration cycle apparatus  203 , therefore, degradation in performance due to the hindered rotation is suppressed. 
     Sixth Embodiment 
     As illustrated in  FIG.  13   , a magnetic refrigeration cycle apparatus  204  according to a sixth embodiment basically has a configuration similar to magnetic refrigeration cycle apparatus  200  according to the first embodiment hut differs from magnetic refrigeration cycle apparatus  200  in that it includes a plurality of magnetic heat pumps  100 , a third channel  37  and a fourth channel  38  connecting a plurality of magnetic heat pumps  100  in series, and reservoirs  39  and  40  included in third channel  37  and fourth channel  38 . 
     Of two magnetic heat pumps  100  illustrated in  FIG.  13   , magnetic heat pump  100  disposed on the right side is called first magnetic heat pump  100 , and magnetic heat pump  100  disposed on the left side is called second magnetic heat pump  100 . 
     Third channel  37  connects first outlet P 2  of first magnetic heat pump  100  and first inlet P 1  of second magnetic heat pump  100  in series. Fourth channel  38  connects second outlet P 4  of second magnetic heat pump  100  and second inlet P 3  of first magnetic heat pump  100  in series. 
     Reservoir  39  is included in third channel  37 . Reservoir  39  stores part of the heat transport medium flowing through third channel  37 . Reservoir  40  is included in fourth channel  38 . Reservoir  40  stores part of the heat transport medium flowing through fourth channel  38 . The amount of heat transport medium stored in each of reservoir  39  and reservoir  40  may change over time. 
     When at least one of the flow rate per unit time of the heat transport medium flowing out of first outlet P 2  of first magnetic heat pump  100  and the flow rate per unit time of the heat transport medium flowing into first inlet P 1  of second magnetic heat pump  100  changes over time, a pressure difference occurs between the heat transport medium in first magnetic heat pump  100  and the heat transport medium in second magnetic heat pump  100 , and the heat transport medium having a relatively high pressure may hinder the rotation. If the rotation is hindered, the performance of the magnetic refrigeration cycle apparatus is degraded. 
     In magnetic refrigeration cycle apparatus  204 , since the flow rate difference is reduced by the heat transport medium flowing out of each of reservoir  39  and reservoir  40 , a pressure difference is less likely to occur between the heat transport medium in first magnetic heat pump  100  and the heat transport medium in second magnetic heat pump  100 . In Magnetic refrigeration cycle apparatus  203 , therefore, degradation in performance due to the hindered rotation is suppressed. 
     Refrigeration cycle apparatus  204  may further include controller  8  in the same manner as magnetic refrigeration cycle apparatus  203 . 
     &lt;Modifications&gt; 
     In magnetic heat pump  100 ,  101 , impeller  2  has at least one accommodation chamber  2 C or accommodation chamber  12 C. Magnetic heat pump  100 ,  101  includes at least one magnetocaloric member  1  or magnetocaloric member  11  and at least one deformable member  3  or deformable member  13 . 
     In magnetic heat pump  100 , magnetocaloric member  1  does not necessarily have slits  1 A. Similarly, in magnetic heat pump  102 , magnetocaloric member  11  does not necessarily have slits  11 A. Magnetocaloric member  1  and magnetocaloric member  11  may include a plurality of particles made of a magnetocaloric material in magnetocaloric member  1  and magnetocaloric member  11 , a plurality of minute gaps are formed between adjacent particles and the minute gaps are continuous to each other. The minute gaps continuous to each other form a plurality of channels through which a heat transport medium flows. Therefore, the area of the heat transfer surface in contact with the heat transport medium in magnetocaloric member  1  and magnetocaloric member  11  is larger than when magnetocaloric member  1  and magnetocaloric member  11  do not contain a plurality of particles made of a magnetocaloric material. 
     Embodiments disclosed here should be understood as being illustrative rather than being limitative in all respects. The scope of the present disclosure is shown not in the foregoing description but in the claims, and it is intended that all modifications that come within the meaning and range of equivalence to the claims are embraced here. 
     REFERENCE SIGNS LIST 
       1 ,  11  magnetocaloric member,  1 A,  11 A slit,  2 C,  12 C accommodation chamber,  2 ,  12  impeller,  2 A base,  28  vane,  3 ,  13  deformable member,  3 A stationary part,  3 B 1 ,  3 D 1 ,  12 B outer peripheral surface,  3 B movable part,  3 C first elastic part,  3 D connecting part,  4 ,  14  casing,  4 A,  14 A first inner peripheral surface,  5 ,  15  electric motor,  5 A shaft,  6 ,  16  magnetic field generator,  7  guide member,  7 A 1  first surface portion,  7 A 2  second surface portion,  7 A 3  third surface portion,  7 A 4  fourth surface portion,  7 A second inner peripheral surface,  8  controller,  12 A central part,  13 A inner peripheral portion,  13 B outer peripheral portion,  14 A 1  ninth surface portion,  14 A 2  tenth surface portion,  14 A 3  eleventh surface portion,  14 A 4  twelfth surface portion,  21 ,  31  first channel,  22 ,  32  second channel,  21 A first line,  21 B second line,  23  first heat exchanger,  24  second heat exchanger,  25  thermal storage tank,  26  pump,  27  first valve,  28  second valve,  29 ,  30  branch line,  33 ,  34 ,  35 ,  36  valve,  37  third channel,  38  fourth channel,  39 ,  40  reservoir,  100 ,  101 ,  102  magnetic heat pump,  200 ,  201 ,  202 ,  203 ,  204  magnetic refrigeration cycle apparatus, P 1  first inlet, P 2  first outlet, P 3  second inlet, P 4  second outlet.