KR100716007B1 - Active magnetic refrigerator - Google Patents

Abstract

The present invention relates to an active magnetic refrigerator comprising a separated high temperature heat exchanger and a low temperature heat exchanger in which a heat conduction fluid for exchanging heat with a plurality of magnetic heat exchange units in which magnetic material calorific pieces are arranged to form a gap is circulated separately through a solenoid valve.

Description

Active magnetic refrigerator

1 is a conceptual diagram of an active magnetic refrigerator.

2 is a plan view of a thermally conductive fluid component in a conventional rotating magnetic magnetic refrigerator.

3 is a plan view of an exemplary magnetic heat exchange chamber comprising the powdered magnetocaloric material of FIG.

4A and 4B are plan views illustrating a cycle of a thermally conductive fluid according to a position of a magnet in an active magnetic refrigerator according to a preferred embodiment of the present invention.

4C is a plan view showing one cycle of FIGS. 4A and 4B.

Figure 4d is a cross-sectional view schematically showing a magnet rotation assembly.

5A and 5B are a perspective view and a partially enlarged view showing a table on which a flow passage is formed.

Figure 6 is an external perspective view showing a magnetic heat exchange unit adopted in the active magnetic refrigerator of the present invention.

FIG. 7A is a sectional view taken on line B-B in FIG. 6; FIG.

7B-7D are cross-sectional views of another embodiment taken on line B-B in FIG. 6;

Fig. 8 is a perspective view showing a rod-shaped magnetocaloric material piece in which a longitudinal groove is formed.

<Explanation of symbols for the main parts of the drawings>

5,160,161: Pump 6,162: High temperature heat exchanger (outdoor unit)

12,163: low temperature heat exchanger (indoor part) 13: magnetic heat exchange room

17aa, 17ab: first heat conducting fluid 17bb, 17bc: second heat conducting fluid

112,212,312,412a, 412b: Magnetocaloric material piece (Gd)

113,213,313,413: Magnetic heat exchange unit 114,214,314,414: Interval (void)

115: case 115a, 116a: inlet port

115b, 116b: Outflow ports 130a, 131a; 130b, 131b: High temperature side tubes

132a, 133a; 132b, 132b: Low temperature side tube 140: Magnet rotating assembly

141: magnet 143: yoke

147: rotating support 148: motor

149: motor shaft 150: table

150a: top plate 150b: legs

153A, 153B: mounting portion 155: bridge

157: tunnel

Korean Unexamined Patent Publication No. 204-00604

U.S. Patent Publication Nos. 6,66,6,600

Japanese Patent Publication No. 205-551333

The present invention relates to an active magnetic refrigerator comprising a separated high temperature heat exchanger and a low temperature heat exchanger in which a heat conduction fluid for exchanging heat with a plurality of magnetic heat exchange units in which magnetic material calorific pieces are arranged to form a gap is circulated separately through a solenoid valve.

Referring to the concept of an active magnetic refrigerator, as shown in Fig. 1, (a) As the magnet moves to the right, the temperature of the magnetic refrigerant layer, which is caught by the magnetic field, rises from the dotted line to the solid line. (b) As the heat-conducting fluid of the low temperature part moves toward the high temperature part, the magnetic refrigerant layer is cooled to the solid line temperature at the dotted line. At this time, the fluid is gradually heated to a high temperature at the right outlet to release heat by heat exchange with the high temperature part. (c) As the magnet moves to the left, the temperature of the magnetic refrigerant layer from which the magnetic field is removed is further dropped from the dotted line to the solid line. (d) The magnetic refrigerant layer is heated to the solid line temperature in the dotted line by the movement of the fluid from the high temperature portion to the low temperature portion, and the fluid is relatively cooled, and the low temperature is absorbed from the low temperature portion by absorbing heat from the low temperature portion.

As a conventional active magnetic refrigerator having such a cycle, the publications described above are proposed, for example. As shown in FIGS. 2 and 3, a conventional active magnetic refrigerator has a heat conducting fluid which is heated by a self-heating effect of a magnetocaloric material to which a magnetic field is applied while a heat conducting fluid introduced into a first flows in a second flow. Absorbs and exits the pipe through outlet 2 to cool the magnetocaloric material. The high temperature part passes through the pipe 3, through the distributor 4, through the pump 5, through the outdoor unit part (high temperature heat exchanger) 6, and then is introduced into the magnetic heat exchange chamber 7. In the seventh pipe, the high temperature part is divided into the 8th pipe and the 9th pipe and moves to the low temperature part at 10 to proceed to the distributor 11. When the hot portion moves from 7 to 8 and from 9 to 10, it cools through the magnetocaloric material already cooled by the hot portion. The same cycle continues as the cold section, which has passed through the distributor 11, passes through the indoor section (low temperature heat exchanger) 12 to pipes 13, 14 and 15.

As described above, the conventional magnetic refrigerator is difficult to manufacture because it is complicated by using 12 magnetic heat exchange chambers, 4 distributors, and 24 or more pipes.

In addition, since one thermal conductive fluid circulates to play a role of a high temperature part and a low temperature part, as shown in FIG. 1, a high temperature part enters at No. 7 (inlet of a high temperature part), and is cooled to a low temperature part while passing through a cooled magnetocaloric material (see FIG. 3). Since exiting to exit 8, the efficiency of heat exchange is reduced. At this time, if the heat conduction fluid at a temperature lower than the temperature of the high temperature portion introduced at 7 enters the 7, and passes through the cooled magnetocaloric material, the heat conduction fluid at a lower temperature can flow from the exit 8, so that the efficiency of heat exchange is improved. It can be seen that the increase.

In addition, by using both the high temperature side and the low temperature side as one heat conductive fluid, it is not possible to control the amount of the heat conductive fluid passing through the high temperature portion, and thus the heat of the magnetocaloric material cannot be cooled as quickly as possible, resulting in poor heat exchange efficiency.

On the other hand, in order to prevent the problem that the powder-type magnetocaloric material is swept away by the heat conducting fluid (cooling water), a very fine mesh must be used at the entrance and thus there is a problem of preventing the smooth circulation of the cooling water.

In addition, smooth heat exchange is difficult because the heat-conducting fluid continues to pass only once passed through the magnetocaloric material.

In addition, finely sized gadolinium materials can be lost when the heat conducting fluid flows into or out of the magnetic heat exchange unit.

The present invention has been made to solve the above problems, and to provide an active magnetic refrigerator capable of controlling the high heat exchange efficiency and the amount of heat conducting fluid by separating and circulating the hot and cold parts.

Active magnetic refrigerator of the present invention for achieving the above object is a first magnetic heat exchange unit and a second magnetic heat exchange unit comprising a magnetocaloric material for passing the flow of the heat conducting fluid; magnet; A magnet rotating assembly for disposing or applying the magnetic field to the first magnetic heat exchange unit or the second magnetic heat exchange unit; A high temperature heat exchanger circulatingly connected to the first magnetic heat exchange unit and the second magnetic heat exchange unit; A low temperature heat exchanger circulatingly connected to the first magnetic heat exchange unit and the second magnetic heat exchange unit; A first solenoid valve for redirecting a first heat conducting fluid from the high temperature heat exchanger to the first magnetic heat exchange unit or the second magnetic heat exchange unit to which a magnetic field is applied; A second solenoid valve for diverting a second heat conducting fluid from the low temperature heat exchanger to the second magnetic heat exchange unit or the first magnetic heat exchange unit whose magnetic field is erased; It is made, including.

By this configuration, it is possible to control the high heat exchange efficiency and the amount of heat conductive fluid by separating and circulating the high temperature portion and the low temperature portion.

In the above-described configuration, a plurality of mounting portions formed on the plane of rotation of the magnet and the first magnetic heat exchange unit and the second magnetic heat exchange unit are mounted, a through portion in which the magnet rotation assembly is disposed at the center, and the heat exchanger. Connecting passages for connecting the devices and the magnetic heat exchange units; It may be configured to include a table constituting.

In addition, the connection passage of the portion where the first heat conducting fluid and the second heat conducting fluid cross is preferably formed in the form of a tunnel and a bridge.

The magnet rotation assembly may further include a yoke including a flange supporting the magnets disposed above and below the first magnetic heat exchange unit or the second heat exchange unit, and a web connecting the flanges; A rotational power transmission member for transmitting rotational power to the yoke; It is preferable that it consists of.

The first magnetic heat exchange unit includes a first case including the magnetocaloric material, an upper surface inlet port and an upper surface outlet port formed on an upper surface of the first case, and a lower surface inlet port formed on a lower surface of the first case. And a lower surface discharge pod; The second magnetic heat exchange unit includes a second case including the magnetocaloric material, an upper surface inlet port and an upper surface outlet pod formed on an upper surface of the second case, a lower surface inlet port formed on a lower surface of the second case, and When the lower surface outflow pod is configured, heat exchange efficiency can be increased by completely separating the low temperature portion and the high temperature portion.

In this case, the magnetocaloric material is implemented by a plurality of magnetocaloric material pieces disposed in the first case or the second case so that a gap is formed, and thus the heat conducting fluid can be smoothly flown without using a mesh.

Each of the magnetocaloric material pieces is preferably formed of a rod-shaped gadolinium (Gd) material having a circular cross section in a plate shape or a longitudinal direction disposed at intervals that do not contact each other.

When the grooves are formed in the rod-shaped magnetocaloric material piece in the longitudinal direction, the contact area becomes wider, thereby improving heat exchange efficiency.

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

4A and 4B are plan views illustrating cycles of a thermally conductive fluid according to a position of a magnet in an active magnetic refrigerator according to a preferred embodiment of the present invention, and FIG. 4C is a plan view showing one cycle of FIGS. 4A and 4B. Figure 4d is a schematic cross-sectional view showing a magnet rotating assembly, Figures 5a and 5b is a perspective view and a partial enlarged view showing a table formed with a flow passage, Figure 6 is a magnetic heat exchange unit adopted in the active magnetic refrigerator of the present invention It is an external appearance perspective view.

As shown in Figs. 4A to 6, the active magnetic refrigerator of the present embodiment includes a first magnetic heat exchange unit 113A and a second magnetic heat exchange unit 113B including a magnetocaloric material through which a flow of heat conductive fluid flows; Magnets 141 disposed on the magnetic heat exchange units 113A and 113B, a magnet rotation assembly 140 for rotating or applying the magnetic field to the magnets 11, a high temperature heat exchanger 162, and a low temperature. It consists of a heat exchanger 163, the 1st solenoid valve 120a, and the 2nd solenoid valve 120b.

The heat conducting fluid is separated into a first heat conducting fluid 17aa and 17ab circulating through the high temperature heat exchanger 162 and a second heat conducting fluid 17bb and 17bc circulating through the low temperature heat exchanger 163. Will form.

When the first magnetic heat exchange unit 113A is viewed in a plan view, it is preferable that a plurality of the second magnetic heat exchange units 113B are disposed above and below.

The first solenoid valve 120a is a high temperature side first heat conducting fluid 17aa from the high temperature heat exchanger 162 to the first magnetic heat exchange unit 113A through a tube 130a or a tube 130b. It is a three-port two-way solenoid valve for flowing the second heat conducting fluid (17ab) to the high temperature heat exchanger (162) by switching the direction to the second magnetic heat exchange unit (113B) through the heat exchanger.

That is, the first solenoid valve 120a is provided at the branch point of the tube 130a or the tube 130b connected to the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B.

Similarly, the second solenoid valve 120b passes the low temperature side second heat conducting fluid 17bb from the low temperature heat exchanger 163 to the second magnetic heat exchange unit 113B through the tube 132a, or It is a three-port two-way solenoid valve for flowing the second heat conducting fluid 17bc, which has been heat exchanged by changing the direction of the first magnetic heat exchange unit 113A through the tube 132b, into the low temperature heat exchanger 163.

That is, the second solenoid valve 120b is provided at a branch point branched to the tubes 132a and 132b connected to the second magnetic heat exchange unit 113B or the first magnetic heat exchange unit 113A.

In this way, the first heat conducting fluid 17aa and 17ab on the high temperature side and the second heat conducting fluid 17bb and 17bc on the low temperature side are separated and circulated in two cycles, so that the efficiency of heat exchange is improved and the heat conduction fluid is The amount can be controlled, in particular, a control capable of flowing a large amount of heat-conducting fluid to a high temperature part can further increase the efficiency of heat exchange.

In addition, it is preferable that the flow of the first heat conducting fluids 17aa and 17ab and the second heat conducting fluids 17bb and 17bc is generated by the pumps 160 and 161.

That is, as shown in Figures 4a to 4c, the high temperature / low temperature heat exchange circulation member implements a closed cycle as one closed circuit. Therefore, since the atmospheric pressure is not directly applied to the thermally conductive fluid, there is almost no resistance applied to the pressure of the pumps 160 and 161, and the circulation of the thermally conductive fluid is actively performed, thereby shortening the heat exchange time and increasing the efficiency.

The magnetic heat exchange units 113A and 113B include a magnetocaloric material 112 for passing the flow of the heat conducting fluid. The magnetocaloric material 112 has a characteristic of changing temperature when a magnetic field is applied, and a material having excellent characteristics is gadolinium (Gd) having a fine size of powder. This gadolinium has pores that are excellent in permeability to the flow of heat conducting fluid, and has excellent heat absorption and release.

First Embodiment: Magnetic Heat Exchange Unit 113

6 and 7A, the magnetic heat exchange unit 113 of the first embodiment includes a case 115 penetrating up and down and a plurality of magnets disposed in the case 115 to form a gap 114. It is comprised from the calorie material piece 112.

Two ports 115a and 116b are formed on the upper surface of the case 115, and two ports 115b and 116a are formed on the lower surface of the case 115.

When the case 115 is the first magnetic heat exchange unit 113A, the ports 115a and 116b are connected to the tubes 130a and 133b, and the ports 115b and 116a are the tubes 131a and 132b. )

When the case 115 is the second magnetic heat exchange unit 113B, the ports 115a and 116b are connected to the tubes 130b and 133a, and the ports 115b and 116a are the tubes 131b and 132a. )

The case 115 may be prepared by arranging the magnetocaloric material pieces 112 in a divided state into two and then manufacturing the magnetic heat exchange unit 113 by assembling, gluing, or welding each other.

The case 115 of the present embodiment may be connected to and supported by the tube by the ports 115a and 116b and the ports 115b and 116a. This support can achieve a heat insulating state in which the magnetocaloric material piece 112 of the magnetic heat exchange unit 113 is not exposed to the outside, thereby increasing heat exchange efficiency.

The magnetocaloric material pieces 112 are arranged in parallel so as to form powder-type gadolinium in a plate shape and then to the case 115 at intervals 114 which are not in contact with each other. The plate-shaped magnetocaloric material piece 112 may be embodied as a thick sheet from a thin foil, depending on the flow rate and heat exchange rate of the thermally conductive fluid.

As such, the plate-shaped magnetocaloric material piece 112 having the non-contact gap 114 has no material loss even without using a mesh, and since the heat conducting fluid flows through the gap 114, it not only induces a smooth flow, but also a plurality of It is possible to evenly contact the entire magnetocaloric material piece 112, and because it is in contact with a large area of the plate can obtain a higher heat exchange efficiency than the conventional heat exchange.

Second Embodiment: Magnetic Heat Exchange Unit 213

As shown in Fig. 7B, in the magnetic heat exchange unit 213 of the second embodiment, a rod-shaped magnetocaloric material piece 212 is disposed instead of the plate-shaped magnetocaloric material piece 112 of the first embodiment. That is, the circular cross section has a constant rod shape along the longitudinal direction.

Even if such rod-shaped magnetocaloric material pieces 212 are randomly arranged, due to the shape of a circular cross section, gaps 214 such as voids are formed in contact or non-contact between them, and the thermally conductive fluid is provided through the gaps 214. By flowing, it is possible to obtain the same effect as in Example 1 described above.

The rod-shaped magnetocaloric material piece 212 is preferably placed in a batch by inserting each rod placed in a string (vertical in view).

On the other hand, in the rod-shaped magnetocaloric material piece 212, as shown in Figure 8, the groove 212a is formed along the longitudinal direction, it is possible to widen the contact area with the thermal conductive fluid can further improve the heat exchange efficiency have.

Third Embodiment: Magnetic Heat Exchange Unit 313

As shown in Fig. 7C, the magnetic heat exchange unit 313 of the third embodiment replaces the random arrangement of the rod-type magnetocaloric material pieces 212 of the second embodiment, instead of the plate magnetocaloric material pieces 112 of the first embodiment. The rod-type magnetocaloric material piece 312 which arrange | positioned in the form like this and formed the space | interval 314 is arrange | positioned.

It is preferable that this rod-shaped magnetocaloric material piece 312 is also placed in a batch by inserting each rod arranged in a row (vertical in view).

Also in this rod-shaped magnetocaloric material piece 312, it is preferable that grooves 212a are formed along the longitudinal direction as shown in FIG. 8.

Fourth Embodiment: Magnetic Heat Exchange Unit 413

As shown in FIG. 7D, the magnetic heat exchange unit 413 of the fourth embodiment has a state in which the rod-shaped magnetocaloric material piece 412a and the plate-shaped magnetocaloric material piece 412b are arranged so as to form a gap 414. Is showing.

The magnetic heat exchange unit 113 as described above is preferably mounted to the table 150.

As shown in FIG. 5A, the table 150 includes a top plate 150a on which mounting portions 153A and 153B are mounted at predetermined intervals of the magnetic heat exchange unit 113, and the tube 150 while supporting the top plate 150a. 130a; 131a, 132a; 133a, 130b; 131b, 132b; 133b, and a connection path between the upper plate 150a. The mounting parts 153A and 153B may be implemented as grooves or through holes.

Particularly, in the connection passage inside the upper plate 150a, as shown in FIG. 5B, a portion where the first heat conducting fluid and the second heat conducting fluid cross each other is mixed with each other by the bridge 155 and the tunnel 157 method. To prevent it. The bridge 155 is shaped like a raised viaduct having a thicker thickness than other connection passages, thereby facilitating the formation of the tunnel 157.

By the bridge 155 and the tunnel 157 as described above, the thickness of the upper plate 150a can be minimized.

The magnet rotating assembly 140, which rotates the magnet 141 and applies or erases the magnetic field to the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B, is perforated in the center of the upper plate 150a. May be disposed on the ball 151.

As the magnet rotary assembly 140, the magnet 141 disposed on both sides of the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B as in the present embodiment is replaced with the second magnetic heat exchange unit 113B or the first magnetic heat exchange unit 113B. It is a structure which rotates and moves to one magnetic heat exchange unit 113A.

That is, as shown in FIG. 4D, the magnet rotation assembly 140 includes a plurality of yokes 143 having magnets 141 disposed on both sides, a rotation support 147 supporting the plurality of yokes 143, and It is preferable to configure the rotary power transmission member for rotating the rotary support 147.

The role of the yoke 143 is preferable in that the magnetic heat exchange unit receives a high intensity magnetic field by concentrating the magnetic field of the magnet 141 toward the magnetic heat exchange unit 113.

The rotation power transmission member may be implemented by a motor 148 and a rotation shaft 149 which transmits the rotation power of the motor 148 to the rotation support 147.

Of course, the rotating shaft 149 is coupled to the yoke 143, or a variety of such as to transfer the rotational power to the belt, it will be apparent to those skilled in the art that these various embodiments can be implemented by the rotational power transmission member described above.

Hereinafter, a cycle of an active magnetic refrigerator adopting the magnetic heat exchange unit 113 of the first embodiment will be described, wherein the atmospheric temperature of heat exchange with the outdoor unit 162 and the indoor temperature of heat exchange with the indoor unit 163 are 26 ° C. As a result of experimenting with the properties of the magnetocaloric material, the magnetocaloric material is usually raised to about 3 ° C. above the atmospheric temperature when magnetized, and further cooled to about 3 ° C. below the ambient temperature when cooled by a heat conducting fluid. do.

All systems are stationary and only the magnet 141 is rotated by the magnet rotation assembly 140 to alternately apply the magnetic field to the magnetocaloric material of the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B. .

First, as shown in FIG. 4A, a state in which the magnet 141 is located in the first magnetic heat exchange unit 113A on the left and right sides will be described.

When the magnetic field is caught by the magnetocaloric material of the first magnetic heat exchange unit 113A, the first solenoid valve 120a operates to press the first magnetically conductive fluid 17aa at 26 ° C. together with the pressure through the tube 130a. The magnetocaloric material heated to 29 ° C. by the magnetic field by flowing through the heat exchange unit 113A is cooled to 26 ° C., while the first heat conductive fluid 17ab performs heat exchange to absorb heat to 29 ° C. The first heat conduction fluid 17ab at 29 ° C subjected to this heat exchange is subjected to a cycle of cooling with the first heat conduction fluid 17aa at 26 ° C after exchanging heat with the atmosphere in the high temperature heat exchanger 162 through the tube 131a ( See the red solid arrows in FIGS. 4A and 4C).

In the second magnetic heat exchange unit 113B which is not subjected to the magnetic field, the second solenoid valve 120b is operated to exchange the second magnetic heat exchange fluid 17bb at 26 ° C. with the pressure through the tube 132a. By flowing to the unit 113B, the magnetocaloric material at 23 ° C. without a magnetic field is heated to 26 ° C., while the second heat conductive fluid 17bc performs heat exchange to cool to 23 ° C. The second heat conducting fluid 17bc at 23 ° C., which has undergone this heat exchange, is subjected to heat exchange with a room at a low temperature heat exchanger 163 after passing through the tube 133a, and then the second magnetic heat exchange unit 17bb at 26 ° C. The cycle through 113B) is repeated (see the blue solid arrows in FIGS. 4A and 4C).

On the other hand, as shown in Figure 4b, a state in which the magnet 141 is rotated and positioned in the upper and lower second magnetic heat exchange unit 113B will be described.

When the magnetic field is caught by the magnetocaloric material of the second magnetic heat exchange unit 113B, the first solenoid valve 120a is operated to press the first magnetically conductive fluid 17aa at 26 ° C. together with the pressure through the tube 130b. The magnetocaloric material heated to 29 ° C. by the magnetic field by flowing to the heat exchange unit 113B is cooled to 26 ° C., while the first heat conductive fluid 17ab performs heat exchange to absorb heat to 29 ° C. The 29 ° C. first heat conducting fluid 17ab subjected to the heat exchange is subjected to a cycle of cooling with the first heat conducting fluid 17aa at 26 ° C. after exchanging heat with the atmosphere in the high temperature heat exchanger 162 through the tube 131b ( See the dashed red arrows in FIGS. 4A and 4C).

In the first magnetic heat exchange unit 113A, in which no magnetic field is applied, the second solenoid valve 120b is operated to exchange the first heat exchange fluid 17bb at 26 ° C. with the pressure through the tube 132b. By flowing to the unit 113A, the magnetocaloric material at 23 ° C. without a magnetic field is heated to 26 ° C., while the second heat conductive fluid 17bc undergoes heat exchange to cool to 23 ° C. The second heat conducting fluid (17bc) at 23 ° C subjected to the heat exchange is heat exchanged with a room at the low temperature heat exchanger (163) after passing through the tube (133b), and then the second heat conducting fluid (17bb) at 26 ° C is subjected to the first magnetic heat exchange unit. The cycle through 113A is repeated (see the blue dashed arrows in FIGS. 4A and 4C).

As such, the first solenoid valve 120a may absorb the heat by flowing the first heat conducting fluid to the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B having a magnetic field, and then release heat to the atmosphere. On the other hand, the second solenoid valve 120b flows the second heat conducting fluid to the first magnetic heat exchange unit 113A or the second magnetic heat exchange unit 113B which does not have a magnetic field, thereby cooling the room. It is a valve to change direction to absorb heat. This conversion is possible with a simple program in digital form.

As described above, the heat exchange efficiency of the active magnetic refrigeration cycle can be remarkably improved by separating the circulation of the thermally conductive fluid into the high temperature heat exchanger and the low temperature heat exchanger and exchanging the heat in two cycles.

In addition, in such a system, since the heat conduction fluid at the atmospheric temperature is introduced into the magnetocaloric material piece, the heat conduction fluid is more heated and cooled more than before according to the state of the material, thereby increasing the efficiency of heat exchange.

In addition, since the high temperature heat exchanger and the low temperature heat exchanger are separated, it is possible to control the flow of the first heat conducting fluid and the second heat conducting fluid differently. Therefore, a large amount of the first heat conducting fluid is flowed into the high temperature side magnetic heat exchange unit to cool the heat of the magnetocaloric material as quickly as possible.

The active magnetic refrigerator of the present invention is not limited to the above-described embodiments, and may be variously modified and implemented within the range permitted by the technical idea of the present invention.

As apparent from the above description, the active magnetic refrigerator of the present invention has the following effects.

By separating the circulation of the thermally conductive fluid into the high temperature heat exchanger and the low temperature heat exchanger, respectively, and circulating in two cycles, there is no mixing between the thermally conductive fluids, thereby improving heat exchange efficiency.

In addition, since the high temperature heat exchanger and the low temperature heat exchanger are separated, it is possible to control the flow of the first heat conducting fluid and the second heat conducting fluid differently. Therefore, a large amount of the first heat conducting fluid is flowed into the high temperature side magnetic heat exchange unit to cool the heat of the magnetocaloric material as quickly as possible.

In addition, the magnetocaloric material piece can achieve an adiabatic state not exposed to the outside, thereby increasing heat exchange efficiency.

In addition, since the high-temperature / low-temperature heat exchange circulation member constitutes a closed cycle as one closed circuit, since the atmospheric pressure is not directly applied to the heat conductive fluid, there is little resistance to the pump pressure, and the circulation of the heat conductive fluid is actively performed to shorten the heat exchange time. And an increase in efficiency can be obtained.

In addition, a plurality of mounting portions formed on the plane of rotation of the magnet is mounted to the first magnetic heat exchange unit and the second magnetic heat exchange unit, a through portion in which the magnetic rotation assembly is disposed in the center, the heat exchangers and the A connection passage connecting the magnetic heat exchange units; By including a table, the installation of the magnetic heat exchange unit is simple, and it is possible to form a connection passage for the connection of the heat exchange period, and the layout of the tube is excellent.

In addition, the connection passage of the portion where the first heat conducting fluid and the second heat conducting fluid cross each other is formed in the form of a tunnel and a bridge, thereby preventing mixing between the fluids while maintaining an excellent tube layout.

In addition, the magnet rotation assembly is composed of a yoke and a rotational power transmission member, so that the magnetic field can be applied or erased while the magnetic heat exchange unit is fixed, and the yoke concentrates the magnetic field of the magnet in the direction of the magnetic heat exchange unit. Can be received by the magnetic heat exchange unit.

In addition, since there are dedicated ports (two upper and two lower) through which the high and low temperatures can pass through the magnetic heat exchange unit, respectively, the heat conduction fluids of the high temperature and the low temperature are not mixed, thereby improving heat exchange efficiency.

In addition, the magnetic heat exchange unit is composed of a case and a plurality of magnetocaloric material pieces disposed in the case so as to form a gap, so that the heat conducting fluid can flow between the gaps, thereby preventing the flow of the magnetic flux to the seat that has passed once. The heat exchange efficiency is improved through uniform contact between the calorie material and the heat conducting fluid, and the use of the mesh is unnecessary, so the heat conducting fluid flows smoothly.

In addition, since the magnetocaloric material piece is implemented in a plate or rod shape, there is little fear of loss.

In addition, when the groove is formed in the rod-shaped magnetocaloric material piece in the longitudinal direction, the contact area is further widened, thereby improving heat exchange efficiency.

Claims (9)

A first magnetic heat exchange unit and a second magnetic heat exchange unit including a magnetocaloric material through which a flow of heat conductive fluid flows; magnet; A magnet rotating assembly for disposing or applying the magnetic field to the first magnetic heat exchange unit or the second magnetic heat exchange unit; A high temperature heat exchanger circulatingly connected to the first magnetic heat exchange unit and the second magnetic heat exchange unit; A low temperature heat exchanger circulatingly connected to the first magnetic heat exchange unit and the second magnetic heat exchange unit; A first solenoid valve for redirecting a first heat conducting fluid from the high temperature heat exchanger to the first magnetic heat exchange unit or the second magnetic heat exchange unit to which a magnetic field is applied; A second solenoid valve for diverting a second heat conducting fluid from the low temperature heat exchanger to the second magnetic heat exchange unit or the first magnetic heat exchange unit whose magnetic field is erased; Active magnetic refrigerator consisting of. The method of claim 1, A plurality of mounting portions formed on a plane of rotation of the magnet to which the first magnetic heat exchange unit and the second magnetic heat exchange unit are mounted; A through part in which the magnet rotation assembly is disposed at a center thereof; A connection passage connecting the heat exchangers and the magnetic heat exchange units; Active magnetic refrigerator comprising a table constituting the. The method of claim 2, An active magnetic refrigerator characterized in that the connection passage of the portion where the first heat conducting fluid and the second heat conducting fluid intersect in the form of a tunnel and a bridge. The method of claim 3, The magnet rotation assembly may include a yoke including a flange supporting the magnets disposed above and below the first magnetic heat exchange unit or the second heat exchange unit, and a web connecting the flanges; A rotational power transmission member for transmitting rotational power to the yoke; Active magnetic refrigerator characterized in that consisting of. The method according to any one of claims 1 to 4, The first magnetic heat exchange unit includes a first case including the magnetocaloric material, an upper surface inlet port and an upper surface outlet pod formed on an upper surface of the first case, a lower surface inlet port formed on a lower surface of the first case, and If it consists of an outflow pod, The second magnetic heat exchange unit includes a second case including the magnetocaloric material, an upper surface inlet port and an upper surface outlet pod formed on an upper surface of the second case, a lower surface inlet port formed on a lower surface of the second case, and An active magnetic refrigerator characterized in that the lower surface of the discharge pod. The method of claim 5, And said magnetocaloric material is a plurality of magnetocaloric material pieces disposed in said first or second case so that a gap is formed. The method of claim 6, Wherein each of the magnetocaloric material pieces is a plate-like gadolinium (Gd) material disposed at intervals not in contact with each other. The method of claim 6, And each of the magnetocaloric material pieces is a rod-shaped gadolinium (Gd) material having a constant circular cross section in the longitudinal direction. The method of claim 8, The rod-shaped magnetocaloric material piece is an active magnetic refrigerator characterized in that a groove is formed along the longitudinal direction.

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