JP2008051409A - Magnetic refrigeration equipment - Google Patents

Abstract

A magnetic refrigeration apparatus with high operating efficiency is provided.
Auxiliary magnetism having magnetic resistance equivalent to that of the magnetic working body between the magnetic working bodies on the inner surface side of the stator on which the magnetic working bodies are arranged at equal intervals. The bodies 17, 17 ... are arranged. Thereby, the inner surface side of the stator 2 becomes magnetically axisymmetric over the entire circumference, and the torque of the rotor 4 becomes zero.
[Selection] Figure 2

Description

  The present invention relates to a magnetic refrigeration apparatus using the magnetocaloric effect of a magnetic working substance.

In recent years, a magnetic refrigeration apparatus using a property (magnetocaloric effect) that causes a large temperature change when a magnetic working material is magnetized or demagnetized has been attracting attention in place of a conventional gas refrigeration apparatus using a gas refrigerant such as Freon. ing. As the magnetic field generating means that acts on the magnetic working substance, a superconducting magnet or the like that can generate a high magnetic field is advantageous, but it requires a large amount of power to maintain a superconducting magnet that operates near 4K (−269 ° C.). In a magnetic refrigeration apparatus having a refrigeration capacity of about 1 to 10 kW or less, such as a refrigerator or an air conditioner, a compact form using a permanent magnet that does not require power for generating a magnetic field is desired.
Therefore, the present applicant has proposed a magnetic refrigeration apparatus using a permanent magnet as magnetic field generating means in Patent Document 1.
This is because a permanent magnet is mounted on the circumference of a rotating plate to be rotated, while a magnetic working material is provided in a casing and a magnetic working body is disposed adjacent to the permanent magnet so as to face the permanent magnet. A low-temperature pipe and a high-temperature pipe connected to the body form a circulation path for passing the cooling fluid between the magnetic working bodies, and a cooler for cooling the object to be cooled is provided on the low-temperature pipe side of the circulation path on the high-temperature pipe side. A circulator and an exhaust heat exchanger are connected to each other through a switching valve.

  In this magnetic refrigeration apparatus, the magnetic working body is magnetized and the temperature rises due to the approach of the permanent magnet accompanying the rotation of the rotating plate, and the magnetic working body is demagnetized and the temperature falls due to the separation of the permanent magnet. In accordance with this timing, the cooling fluid is circulated so that the switching valve passes through the magnetic working body whose temperature has increased through the cooler from the magnetic working body whose temperature has decreased, thereby freezing the temperature on the low temperature pipe connection side of the magnetic working body. While the temperature is lowered to a temperature at which the capacity and the heat load are balanced, the temperature on the high temperature pipe connection side of the magnetic working body is a constant temperature in which the exhaust heat capacity and the refrigeration capacity of the exhaust heat exchanger are balanced.

JP 2002-106999 A

As described above, the magnetic refrigeration apparatus using the permanent magnet as the magnetic field generating means has advantages such as being compact and requiring no power for generating the magnetic field, but is low in terms of operating efficiency as compared with the gas refrigeration apparatus. Has been pointed out.
In particular, since the magnetic working body is a magnetic body, an intermittent attractive force is generated between the magnetic working body disposed on the inner surface of the stator and the permanent magnet when the rotor including the permanent magnet rotates. In order to rotate against this attractive force, a large torque (magnetic field repulsive torque) is required, which hinders improvement in operating efficiency.
In addition, the heat generated due to the eddy current loss generated in the stator due to the change in the magnetic field becomes heat intrusion into the magnetic working material, which hinders the operation efficiency.

  Accordingly, the present invention has been made to solve the above-described problems of a magnetic refrigeration apparatus using a permanent magnet as a magnetic field generating means, and an object thereof is to provide a magnetic refrigeration apparatus with high operating efficiency.

  In order to achieve the above-mentioned object, the invention described in claim 1 is a rotor that is rotated by a driving means and has a permanent magnet fixed to a peripheral surface thereof, and the rotor is pivotally supported. An apparatus body having a cylindrical stator in which a magnetic working material whose temperature changes in accordance with a permanent magnet and an adjacent magnetic working body is disposed and a circulation formed by connecting the magnetic working bodies is provided. A magnetic refrigeration apparatus comprising: a cooling fluid circulation means for circulating a cooling fluid in a path; and a heat exchanger provided in the circulation path for exchanging heat between the cooling fluid and an object to be cooled. Torque reduction means for reducing the torque of the rotor is provided on the inner surface side of the child so that the entire inner surface side of the stator including the magnetic working body is magnetically axisymmetric.

In addition to the invention of claim 1, the invention described in claim 2 is the same as that of claim 1, in order to easily form the torque reduction means, the torque reduction means is provided with an auxiliary magnetic body having a magnetic resistance equivalent to the magnetic working body, The structure is arranged on the inner surface of the stator excluding the work body.
According to a third aspect of the present invention, in addition to the first aspect of the invention, in order to easily form the torque reducing means, the torque reducing means is configured to uniformly arrange the magnetic working body on the entire inner circumference of the stator. It is what.
According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, in order to reduce the eddy current loss of the stator and improve the refrigerating capacity, at least a part of the stator is It is formed by laminating a plurality of disc-shaped magnetic plates in the axial direction of the stator via insulating means.
In addition to the invention of claim 4, the invention described in claim 5 is a disc-shaped insulating plate that is used as an insulating plate to improve the assemblability of the laminated stator, and is fitted to adjacent magnetic plates. It has been made.

According to the first aspect of the present invention, the torque of the rotor can be greatly reduced by reducing the magnetic field repulsive torque by the torque reducing means, and a magnetic refrigeration apparatus with high operating efficiency can be obtained.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the torque reducing means can be easily formed by employing the auxiliary magnetic body.
According to the third aspect of the invention, in addition to the effect of the first aspect, the torque reducing means can be easily formed by the uniform arrangement of the magnetic working bodies.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the eddy current value is reduced by the laminated structure of the stator, and the eddy current loss is reduced. Therefore, the thermal efficiency can be improved and the refrigeration capacity can be increased.
According to the invention described in claim 5, in addition to the effect of claim 4, the assembling property of the stator is remarkably improved by the fitting structure of the magnetic plate and the insulating plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< Form 1 >>
FIG. 1 is a longitudinal sectional view showing an example of an apparatus main body used in the magnetic refrigeration apparatus of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. This apparatus main body 1 has a hollow cylindrical stator 2 in which the front and rear ends in the axial direction are closed by flanges 3 and 3 and the inside thereof is in a vacuum-tight state, and a shaft center in the stator 2. A rotor 4 having a pair of permanent magnets 5 and 5 attached radially is provided on a symmetrical peripheral surface. The rotor 4 has shafts 6 and 7 that are coaxially connected to the front and rear ends, respectively, rotatably supported by the flange 3, and a servo motor 9 that is connected to one shaft 6 that passes through the flange 3 via a speed reducer 8. Is controlled by rotation. Similarly, the valve body 34 of the rotary valve 10 fixed to the outer surface of the flange 3 is directly connected to the other shaft 7 penetrating the flange 3.

  On the other hand, the stator 2 has disk-shaped magnetic plates 11, 11... With a central portion formed at the center except for the front and rear ends, and a disk-shaped insulating member that is thinner than the magnetic plate 11 and is also formed with a central portion. The plates 12, 12... Are alternately stacked, and are integrally connected by bolts (not shown) penetrating in the axial direction. As shown in FIG. 3, each magnetic plate 11 has a thick portion 13 on the center side, and a gap for accommodating the insulating plate 12 is secured by contact of the thick portions 13 with the adjacent magnetic plate 11. At the same time, the thick portion 13 is fitted to the inner periphery of the insulating plate 12 to achieve positioning.

Further, on the inner periphery of the stator 2, four magnetic working bodies 14, 14... That are twice the number of the permanent magnets 5 are equally spaced in the circumferential direction in a state of being close to the outer peripheral surface of the permanent magnet 5. It is fixed with. This magnetic working body 14 is obtained by filling a magnetic working substance (here, gadolinium (Gd)) 16, 16,... Into a hollow duct 15 whose cross section is an arc shape along the inner periphery of the stator 2. It is.
Further, arc-plate-like auxiliary magnetic bodies 17, 17,... Having a magnetic resistance equivalent to that of the magnetic working body 14 are fixed as torque reducing means between the magnetic working bodies 14 on the inner periphery of the stator 2. ing.

  FIG. 4 is an overall view of the magnetic refrigeration apparatus 20 in which the apparatus main body 1 is incorporated. Each magnetic working body 14 of the apparatus main body 1 has a low-temperature pipe that passes through the flange 3 and is led out of the stator 2. 21 and the high-temperature pipe 22 are connected to each other, and a circulation path for the cooling fluid (here, water) is formed. Here, between the pair of magnetic working bodies 14A and 14A in the axially symmetric position (hereinafter, the reference numerals of the constituent parts are given AB when distinguishing the positions), the low temperature pipe 21A and the high temperature pipe 22A are the other The low-temperature pipe 21B and the high-temperature pipe 22B are connected between the magnetic working bodies 14B and 14B, respectively. On the other hand, between a pair of adjacent magnetic working bodies 14 </ b> A and 14 </ b> B, the low-temperature pipes 21 </ b> A and 21 </ b> B are connected to each other via a cooler 23 for cooling the object to be cooled 24. Further, the high-temperature pipes 22A and 22B of the other adjacent magnetic working bodies 14A and 14B are connected to the circulator 25 and the exhaust heat exchanger 26 through the rotary valve 10.

As shown in FIG. 5, the rotary valve 10 forms a cooling fluid inflow chamber 31 in the main body 30 fixed to the flange 3 of the stator 2, and an inflow port 32 communicating with the inflow chamber 31. Similarly, four outflow ports 33, 33... That communicate with the inflow chamber 31 and are arranged at 90 ° intervals are formed, and a disc-like valve body 34 provided in the inflow chamber 31 penetrates the main body 30. The shaft 7 is connected to the shaft 7 so as to be integrally rotatable. Here, the inflow port 32 is connected to the circulator 25, and the four outflow ports 33 have one set of axially symmetric positions connected to the high temperature pipe 22B, and in the other group, one outflow port 33 is connected to the high temperature pipe 22A. The other outflow ports 33 are connected to the exhaust heat exchanger 26, respectively.
Further, the valve body 34 is pressed toward the outflow port 33 by the coil spring 35, and a pair of outflow ports 33, 33 in an axially symmetric position communicate with each other via the inflow chamber 31 on the pressing surface side. Connection paths 36 and 36 and communication paths 37 for communicating the other sets of outflow ports 33 and 33 are formed. Therefore, every 90 ° rotation of the valve body 34, the cooling fluid supplied from the circulator 25 is alternately supplied to the high temperature pipes 22A and 22B.

The operation of the magnetic refrigeration apparatus 20 configured as described above will be described.
First, when the permanent magnets 5 and 5 are at the 0 ° position (position shown in FIG. 4), the magnetic working materials 16A and 16A of the magnetic working bodies 14A and 14A at the 0 ° and 180 ° positions are magnetized. Temperature rises. On the other hand, the magnetic working materials 16B and 16B of the magnetic working bodies 14B and 14B at the positions of 90 ° and 270 ° different in phase by 90 ° are demagnetized to lower the temperature.
At this time, as indicated by the solid line arrow, the cooling fluid passes through the rotary valve 10 as shown by the solid line arrow 25 → the high temperature piping 22B of the magnetic working body 14B at the 90 ° position → the magnetic working body 14B at the corresponding position → the low temperature piping 21B → 270. High-temperature piping 22B of magnetic working body 14B at the position ° → Magnetic working body 14B at the position → Low-temperature piping 21B → Cooler 23 → Low-temperature piping 21A of the magnetic working body 14A at the position 180 ° → Magnetic working body 14A at the position → High temperature Pipe 22A → low temperature pipe 21A of magnetic working body 14A at 0 ° position → magnetic working body 14A at the position → high temperature pipe 22A → rotary valve 10 → exhaust heat exchanger 26 → circulator 25 in order.
Therefore, the cooling fluid cooled by the magnetic working material 16B whose temperature has decreased is cooled by the cooler 23, and then the magnetic working material 16A whose temperature has been increased and the temperature has been increased is cooled to remove the heat exchanger. Returning to 26, the heat of work is released.

Next, when the rotor 4 is rotated 90 ° together with the permanent magnets 5 and 5, the magnetic working material 16A of the magnetic working body 14A at the positions of 0 ° and 180 ° is demagnetized and the temperature is lowered. The magnetic working materials 16B and 16B of the magnetic working bodies 14B and 14B at the positions of ° and 270 ° are magnetized and the temperature rises. At this time, since the valve body 34 is also rotated 90 ° via the shaft 7 at this time, as shown by the dotted arrow, this time, the cooling fluid is supplied from the high temperature pipe 22A of the magnetic working body 14A at the 0 ° position. It will be circulated.
By repeating this rotation, the temperature on the low temperature pipe 21 connection side of each magnetic working body 14 is lowered to a temperature at which the refrigerating capacity and the heat load are balanced. On the other hand, the temperature on the high temperature pipe 22 connection side of each magnetic working body 14 becomes a substantially constant temperature due to the balance between the exhaust heat capacity and the freezing capacity of the exhaust heat exchanger 26.

  In this rotation, since the magnetic working body 14 is a magnetic body, an attractive force is generated between the magnetic working body 14 and the permanent magnet 5. In this embodiment, each magnetic working body is formed on the inner surface of the stator 2. Between the magnetic working body 14 and the auxiliary magnetic body 17 having an equivalent magnetic resistance, the magnetic working body 14 and the permanent magnet 5 are magnetically symmetric, regardless of the phase of the rotor 4. The suction force between is canceled. Therefore, the torque of the rotor 4 becomes zero.

As described above, according to the magnetic refrigeration apparatus 20 of the first embodiment, the torque of the rotor 4 is magnetically symmetrical about the entire inner surface of the stator 2 including the magnetic working body 14 on the inner surface side of the stator 2. By providing the torque reducing means for reducing the torque, the torque of the rotor 4 can be greatly reduced, and the magnetic refrigeration apparatus 20 with high operating efficiency can be obtained.
Further, here, the torque reducing means is configured such that the auxiliary magnetic body 17 whose magnetic resistance is equivalent to that of the magnetic working body 14 is disposed on the inner surface of the stator 2 excluding the magnetic working body 14, and therefore the torque reducing means is simple. Can be formed.
Furthermore, a part of the stator 2 is formed by laminating a plurality of magnetic plates 11 in the axial direction of the stator 2 via an insulating means, so that the eddy current value in the stator 2 is reduced and the eddy current is reduced. Current loss is reduced. Therefore, the thermal efficiency can be improved and the refrigeration capacity can be increased. In particular, since the insulating means is a disc-shaped insulating plate 12 and is fitted to the adjacent magnetic plates 11, the assemblability of the stator 2 is greatly improved.

In addition, since the stator 2 is configured in a vacuum-tight manner and the interior of the stator 2 containing the rotor 4 and the magnetic working body 14 is held in a vacuum atmosphere, intrusion heat due to air convection and heat conduction is reduced. it can. Therefore, here too, it can contribute to the improvement of thermal efficiency, leading to an increase in the refrigerating capacity.
Furthermore, since the switching of the cooling fluid in the circulation path is controlled by the rotary valve 10 that is directly driven by the rotor 4, the conventional electric power for operating the electromagnetic valve becomes unnecessary, leading to energy saving. Since switching of the flow path of the cooling fluid is performed mechanically, it is possible to avoid the possibility of a phase shift when switching the flow path. Therefore, the cooling fluid can be operated at a constant flow rate, and the refrigerating capacity is improved.

In the first embodiment, the auxiliary magnetic body 17 is used as the torque reducing means. However, as shown in FIG. 6, the magnetic working bodies 14, 14... Are uniformly arranged around the entire inner surface of the stator 2. You may do it. Also in this case, as in FIG. 2, the magnetic force is completely axisymmetric and the torque can be made zero, and the torque reduction means can be easily formed.
Further, the inner surface of the stator may be protruded between the magnetic working bodies to achieve magnetic axis symmetry.

On the other hand, the insulating means employed in the laminated structure of the stator is not limited to the structure in which a separate insulating plate is fitted as in this embodiment, but an insulating agent is applied to the surface of the divided magnetic plate or an insulating film is applied. Or may be formed. Of course, it is not limited to such a laminated structure, and the stator can be formed of a single cylindrical body.
In addition, the number, form, and the like of the magnetic working body and the permanent magnets are not limited to the above forms, and can be appropriately increased or decreased or the design can be changed.

  Hereinafter, other forms of the magnetic refrigeration apparatus will be described. In addition, since the whole structure and the effect | action of a magnetic refrigeration apparatus are the same as that of the previous form 1, the overlapping description is abbreviate | omitted and only a different structure part from the form 1 is demonstrated.

<< Form 2 >>
FIG. 7 is an explanatory view of the magnetic working body 40 provided on the stator 2 of the apparatus main body 1, and the right side shows the whole and the left side shows a cross section taken along the line BB.
The magnetic working body 40 is filled with the magnetic working substance 16 to form a cooling fluid flow path, and is provided with a plurality of (here, six) tubular ducts 41 arranged in parallel with the axial direction of the stator 2. And a pair of jackets 42 and 42 which are located at both ends of the tubular duct 41 and which are connected to each other and curved along the inner surface of the stator 2. In this state, a predetermined gap is formed between adjacent tubular ducts 41.
Therefore, when the cooling fluid is circulated in the magnetic refrigeration apparatus 20 using the magnetic working body 40, the cooling fluid is supplied to the one jacket 42 and then passes through each tubular duct 41 evenly to the other jacket 42. Will be discharged from.

  As described above, according to the magnetic refrigeration apparatus 20 of the second embodiment, the magnetic working body 40 is provided with the plurality of tubular ducts 41 filled with the magnetic working substance 16 and the both ends of the tubular duct 41 on the side. Since the ends are connected to each other and formed from a pair of jackets 42 and 42 that serve as inlets and outlets for the cooling fluid, the eddy current value induced by the increase / decrease change of the magnetic field is remarkably smaller than that of the integrated duct. , Which leads to reduction of eddy current loss. Therefore, the thermal efficiency can be improved and the refrigeration capacity can be increased. In particular, since the pressure resistance of the cooling fluid is improved by adopting the tubular duct 41, the plate thickness of the tubular duct 41 can be reduced as a result. Accordingly, the magnetic gap is also reduced, so that the magnetic field strength acting on the magnetic working body 40 is increased, and further improvement of the refrigerating capacity can be expected. Moreover, since the average heat insulation distance with the stator 2 increases by making a duct into a tubular shape compared with a rectangular duct, the heat penetration | invasion amount from the stator 2 can also be reduced. Accordingly, high operating efficiency can be obtained.

Both the tubular duct 41 and the jacket 42 may be formed of metal (stainless steel or the like), but if at least one is formed of an insulating material (for example, vinyl chloride or the like), eddy current loss can be more effectively reduced. This is preferable. However, if the material of the tubular duct is made of a metal having high strength and the jacket is made of an insulating material, it can be said that it is a good idea because the structural rigidity can be increased.
In addition, the number of tubular ducts can be increased or decreased, the cross-sectional shape can be changed (such as a square or polygonal duct), and the jacket shape can be changed as appropriate.

<< Form 3 >>
8 is a longitudinal sectional view showing another example of the apparatus main body used in the magnetic refrigeration apparatus, FIG. 9A is a sectional view taken along the line CC, and FIG. 8B is a sectional view taken along the line DD.
The apparatus main body 1a shown in FIG. 8 is provided with permanent magnets 5 and 5 attached to the rotor 4 so as to be close to the inner surface of the stator 2, and the permanent magnets 5 and 5 at the front and rear ends of the rotor 4 in the axial direction. Disc-shaped yoke portions 43, 43 having an outer diameter that is slightly smaller than the inner diameter of the stator 2 are integrally formed coaxially with the rotor 4 on the outer side of the stator 2. The four magnetic working bodies 14, 14... That are close to the outer peripheral surface of the yoke portion 43 are arranged on the inner surface of 2.

In the magnetic refrigeration apparatus 20 using the apparatus main body 1a, the magnetic lines of force from the north pole of the permanent magnet 5 are the stator 2 → the end of the stator 2 → the magnetic working body 14A → the yoke part 43 → the magnetic work at the axially symmetric position. It returns to the south pole of the body 14A → stator 2 end → stator 2 → permanent magnet 5.
The surface magnetic flux density of the permanent magnet 5 is about 1.5T. Since the total number of magnetic fluxes is expressed by magnetic flux density × area, here, the magnetic flux concentrates on the magnetic working body 14 and the yoke portion 43 whose axial length is shorter than that of the permanent magnet 5, and a large magnetic flux density is obtained. The magnetic flux density depends on the length of the extended yoke portion 43 and is inversely proportional to the length.
In the conventional structure, the magnetic flux density applied to the magnetic working body 14 is about 0.7T, but according to this embodiment, about 1.4T can be realized.

As described above, according to the magnetic refrigeration apparatus 20 of the third embodiment, the yoke portions 43 and 43 positioned outside the permanent magnets 5 and 5 in the axial direction are provided on both ends in the axial direction of the rotor 4. By arranging the magnetic working body 14 between the inner surface of the stator 2 and the yoke portion 43 on the end side of the stator 2, the magnetic flux concentrates on the magnetic working body 14 and the yoke portion 43, resulting in a high magnetic flux density. Since the magnetocaloric effect of the magnetic working substance increases in proportion to the added magnetic flux density, the refrigeration capacity can be increased more than twice the conventional one. Therefore, high operating efficiency can be realized.
In addition, in the said form, although the yoke part is provided in the axial direction both ends side of a rotor, it can also be provided only in either one side. Further, the shape is not limited to the disk shape of the yoke portion, but may be changed to other shapes such as an oval shape according to the protruding form of the permanent magnet.

<< Form 4 >>
FIG. 10 is a cross-sectional view showing another example of the apparatus main body used in the magnetic refrigeration apparatus. In this apparatus main body 1b, the rotor 4 corresponds to the magnetic working bodies 14A and 14A at axially symmetrical positions. The pairs of permanent magnets 44, 44 and 45, 45 are arranged symmetrically about the axis. The permanent magnets 44, 44 and 45, 45 are arranged between the permanent magnets 44, 44 and 45, 45 in a V shape in the radial direction of the stator 2 so that the same poles face each other. In the circumferential space, magnetic poles 46 are mounted, respectively. Similarly, magnetic poles 47 and 47 are mounted in the circumferential space formed between the permanent magnets 44 and 45, respectively.
However, the V-shaped angle formed between the permanent magnets 44, 44 and 45, 45 is set so that the circumferential distance between the outer ends of the opposing surfaces of the permanent magnet does not exceed the inner surface range of the magnetic working body 14. There is a need. This is because if it exceeds the inner surface range, the concentration of magnetic flux on the magnetic working body 14 as described later cannot be obtained.

In the magnetic refrigeration apparatus 20 using this apparatus main body 1b, the magnetic lines of force from the N poles of the opposing permanent magnets 44, 44 are the magnetic pole 46 → the magnetic working body 14A → the stator 2 → the magnetic working body 14A at the axially symmetric position → Return to the magnetic pole 46 → permanent magnets 45, 45 → magnetic poles 47, 47 → permanent magnets 44, 44 on this side.
Here, in the rotor 4, since the permanent magnets 44 and 45 are arranged in pairs with the same poles facing each other, the magnetic circuit by repulsion of the magnetic poles is compared with the case where the rotor 4 is constituted by one permanent magnet. As a result, the total number of magnetic fluxes of about twice the magnet can be generated. Accordingly, the magnetic flux concentrates on the magnetic pole 46, and a large magnetic flux density is added to the magnetic working body 14.
In the conventional structure, the magnetic flux density applied to the magnetic working body is about 0.7T, but according to the present embodiment, about 1.1T is obtained.

  Thus, according to the magnetic refrigeration apparatus 20 of the fourth embodiment, the permanent magnets 44 and 45 of the rotor 4 have the same poles facing each other and the circumferential distance between the outer ends of the facing surfaces is the magnetic working body. As a pair arranged in a V shape in the radial direction of the stator 2 so as to have an angle that does not exceed the inner surface range of 14, magnetic poles are formed in a circumferential space formed between the permanent magnets 44, 44 and 45, 45. By interposing 46, 47, the total number of magnetic fluxes can be increased by a simple arrangement of the permanent magnets 44, 45, and the magnetic flux density to the magnetic working body 14 can be increased. Since the magnetocaloric effect of the magnetic working substance increases in proportion to the added magnetic flux density, the refrigeration capacity can be increased to 1.5 times or more than the conventional one. Therefore, high operating efficiency can be realized here as well.

  The magnetic poles can be interposed only between the opposing surfaces of at least one pair of permanent magnets. Further, as a material of the magnetic pole, a soft magnetic material such as a permender having a higher saturation magnetic flux density is preferably employed.

In addition, the characteristic structures described in the above embodiments can be appropriately adopted and combined with each other.
For example, the uniform arrangement of the auxiliary magnetic body and the same magnetic working body described in Embodiment 1 can be adopted in the other Embodiments 2 to 4, and a laminated structure of a magnetic plate and an insulating plate of the stator or a vacuum-tight structure Can also be employed in Embodiments 2-4. Similarly, the structure of the magnetic working body including the tubular duct and the joint described in the second embodiment may be adopted in the third and fourth embodiments. Of course, it is not limited to the combination of the two forms, and for example, the configurations of the forms 2 and 4 can be combined with the form 1 simultaneously.

It is a longitudinal cross-sectional view of the apparatus main body of form 1. It is AA sectional view. It is the elements on larger scale which show the fitting structure of a magnetic board and an insulating board. 1 is an overall configuration diagram of a magnetic refrigeration apparatus. It is explanatory drawing of a rotary valve, (A) is a longitudinal cross-section, (B) shows the cross section of a valve body part, respectively. It is a cross-sectional view which shows the example of a change of an apparatus main body. It is explanatory drawing of the magnetic working body of the form 2. It is a longitudinal cross-sectional view of the apparatus main body of form 3. (A) is CC sectional view taken on the line, (B) is DD sectional view. It is a cross-sectional view of the apparatus main body of form 4.

Explanation of symbols

1, 1a, 1b ··· Main unit, 2 ·· Stator, 4 ·· Rotor, 5, 44, 45 ·· Permanent magnet, 10 ·· Rotary valve, 11 ·· Magnetic plate, 12 ·· Insulating plate, 14A, 14B, 40 ... Magnetic work body, 15 ... Duct, 16 ... Magnetic work material, 17 ... Auxiliary magnetic material, 20 ... Magnetic refrigeration equipment, 21A, 21B ... Low temperature piping, 22A, 22B ... High temperature piping, 23 ... Cooler, 25 ... Circulator, 26 ... Waste heat exchanger, 34 ... Valve body, 41 ... Tubular duct, 42 ... Jacket, 43 ... York, 46, 47 ...・ Magnetic poles.

Claims (5)

A rotor that is rotated by a driving means and has a permanent magnet fixed on a peripheral surface thereof, and the rotor is pivotally supported. An apparatus main body having a cylindrical stator in which a magnetic working body adjacent to the magnet is disposed;
A cooling fluid circulation means for circulating a cooling fluid in a circulation path formed by connecting the magnetic working bodies;
A heat exchanger provided in the circulation path and performing heat exchange between the cooling fluid and an object to be cooled, and a magnetic refrigeration apparatus comprising:
A magnetism characterized in that a torque reduction means for reducing the torque of the rotor is provided on the inner surface side of the stator so that the entire inner circumference side of the stator including the magnetic working body is magnetically axisymmetric. Refrigeration equipment.   2. The magnetic refrigeration apparatus according to claim 1, wherein the torque reduction means is configured such that an auxiliary magnetic body having a magnetic resistance equivalent to that of the magnetic working body is disposed on an inner surface of the stator excluding the magnetic working body.   The magnetic refrigeration apparatus according to claim 1, wherein the torque reduction means is configured such that the magnetic working body is uniformly arranged on the entire inner circumference of the stator.   The magnetic refrigeration apparatus according to any one of claims 1 to 3, wherein at least a part of the stator is formed by laminating a plurality of disk-shaped magnetic plates in an axial direction of the stator via an insulating means. The magnetic refrigeration apparatus according to claim 4, wherein the insulating means is a disc-shaped insulating plate and is fitted to adjacent magnetic plates.

Images