KR101812183B1 - Magnetic cooling system - Google Patents

Abstract

The present invention relates to a magnetic cooling system. More specifically, the present invention relates to the magnetic cooling system, comprising: a cylinder having an inner space storing heat transfer fluid; a magnetic calorie material disposed inside the cylinder and formed to enable the heat transfer fluid to pass the same; a magnetic field application unit formed to apply a magnetic field to the magnetic calorie material; and a first piston provided between the magnetic calorie material and a longitudinal first end part of the cylinder inside the cylinder. The heat transfer fluid passes the magnetic calorie material caused by a reciprocating motion of the first piston in the longitudinal direction of the cylinder.

Description

[0001] Magnetic cooling system [0002]

The present invention relates to a self-cooling system, and more particularly, to a self-cooling system capable of reciprocating a heat transfer fluid through a magnetocaloric material at a relatively high frequency by reciprocating motion of a piston coupled to a crank assembly.

Generally, a self cooling system includes a system that utilizes the amount of heat generated from the magnetocaloric material when applying a magnetic field to the magnetocaloric material, and the amount of heat absorbed by the magnetocaloric material when the magnetic field applied to the magnetocaloric material is erased .

That is, magnetic refrigeration is a phenomenon in which a magnetic field is applied to a specific magnetic calorie material (or magnetic material) to generate heat, and when the magnetic field is removed, the temperature is lowered (ie, magnetic calorie effect, MCE, Magnetocaloric Effect). Such self-cooling does not use Freon or Flon, so it is attracting attention as an environment-friendly refrigeration technology.

The magnetocaloric material may be configured to exchange heat with the heat transfer fluid passing through the magnetocaloric material.

When a magnetic field is applied to the magnetocaloric material, the heat transfer fluid can be heated through heat generated from the magnetocaloric material. That is, when a magnetic field is applied to the magnetocaloric material, the heat transfer fluid passing through the magnetocaloric material can be heated.

Alternatively, when the magnetic field applied to the magnetocaloric material is erased, the magnetocaloric material may absorb heat from the heat transfer fluid. That is, when the magnetic field applied to the magnetocaloric material is erased, the heat transfer fluid passing through the magnetocaloric material can be cooled.

A conventional self-cooling system uses a combination of a pump and a valve to flow the heat transfer fluid through the magnetocaloric material.

1 shows a conventional self-cooling system. For example, Korean Patent Laid-Open No. 10-2013-0108765 discloses a conventional self-cooling system.

Referring to FIG. 1, when the magnet 2 moves to the magnetic regenerator 1 and applies a magnetic field to the magnetic regenerator 1, the heat transfer fluid circulates counterclockwise by the fluid transfer device 5. The heat transfer fluid introduced into the magnetic regenerator 1 absorbs the heat generated by the magnetic regenerator 1 to which the magnetic field is applied and then reaches the high temperature side heat exchanger 3 to heat the heat absorbed from the magnetic regenerator 1 Lt; / RTI > The heat transfer fluid that has released heat to the surroundings in the high temperature side heat exchanger (3) flows into the magnetic regenerator (1) through the low temperature side heat exchanger (4).

On the other hand, when the magnet 2 leaves the magnetic regenerator 1 and the magnetic field of the magnetic regenerator 1 is removed, the heat transfer fluid circulates clockwise by the fluid transfer device 5. The heat transfer fluid flowing into the magnetic regenerator 1 transfers heat to the magnetic regenerator 1 from which the magnetic field has been removed, and reaches the low temperature side heat exchanger 4 in a cooled state to absorb the heat of the surroundings. The heat transfer fluid absorbing the surrounding heat in the low temperature side heat exchanger 4 flows into the magnetic regenerator 1 via the high temperature side heat exchanger 3, and the heat exchange cycle is completed once by this process. Such a heat exchange cycle is continuously repeated to obtain a high temperature or a low temperature necessary for heating or cooling.

As a kind of the fluid transfer device 5 for switching the circulation direction of the heat transfer fluid, a combination of a pump for generating a flow rate and a valve for switching the direction of the flow rate can be used.

The operation of the fluid transportation device 5 can be controlled based on the application of the magnetic field by the magnet 2 and the removal period of the magnetic field.

For example, when the magnetic field is applied by the magnet 2, the fluid transportation device 5 is controlled so that the heat transfer fluid circulates counterclockwise, and when the magnetic field is removed, The transfer device 5 can be controlled.

On the other hand, it is necessary to control the pump and the valve to control the fluid transfer device 5 that determines the circulation direction of the heat transfer fluid, and it takes a certain time to control the pump and the valve.

That is, in the conventional self-cooling system, the operating frequency of the fluid transfer device 5 for transfer of the heat transfer fluid in the circulating direction has a problem that the frequency of applying and removing the magnetic field by the magnet 2 is significantly lowered.

In addition, the relatively low operating frequency of the fluid delivery device 5 causes the cycle of the heat exchange cycle to increase. As the cycle of the heat exchange cycle is increased, there is a problem that the capacity of the heat or cold heat that can be obtained through the heat exchange cycle is limited.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a self cooling system capable of securing a relatively high frequency of circulation or flow direction switching of a heat transfer fluid.

It is another object of the present invention to provide a self cooling system capable of obtaining a relatively large capacity of heat or cold heat through a heat exchange cycle.

It is also an object of the present invention to provide a magnetic cooling system capable of reciprocating a heat transfer fluid in a cylinder through a simple structure using a crank assembly and a piston.

Another object of the present invention is to provide a self cooling system capable of reducing power consumption by making a reciprocating frequency of a piston close to a resonance frequency of a self cooling system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a heat exchanger comprising: a cylinder having an internal space in which a heat transfer fluid is accommodated; A magnetocaloric material disposed in the cylinder and configured to pass a heat transfer fluid; A magnetic field applying unit configured to selectively apply a magnetic field to the magnetocaloric material; And a first piston provided in the cylinder between the magnetocaloric material and a longitudinal first end of the cylinder, wherein by the reciprocating movement of the first piston along the longitudinal direction of the cylinder, the heat transfer fluid Is passed through the magnetocaloric material.

The self-cooling system further includes a second piston disposed in the cylinder between the magnetocaloric material and a longitudinal second end of the cylinder, wherein a heat transfer fluid is received between the first piston and the second piston .

The second piston may be reciprocated in the same direction as the reciprocating direction of the first piston.

The self-cooling system may further include a crank assembly for converting the rotational motion of the motor into a reciprocating motion and reciprocating the first piston along the longitudinal direction of the cylinder.

The crank assembly includes a crankshaft receiving the rotational force of the motor; A crank arm connected to the crankshaft and rotated together with the crankshaft; And a connecting rod for converting the rotational motion of the crank arm into a reciprocating motion.

Further, the crank assembly further includes a crank pin eccentrically disposed on the crank shaft, the first end of the connecting rod being connected to the crank pin, and the second end of the connecting rod being connected to the crank shaft, 1 piston.

The self-cooling system may further include an elastic member provided between the second piston and the second longitudinal end of the cylinder.

The elastic member may be formed of an elastic spring to apply an elastic force to the second piston.

The magnetic cooling system comprising: a first heat exchange pipe passing through a first space between the first piston and the magnetocaloric material; And a second heat exchange pipe passing through a second space between the second piston and the magnetocaloric material.

At this time, at least one of the first heat exchange pipe and the second heat exchange pipe may be formed as a heat pipe.

Alternatively, at least one of the first heat exchange pipe and the second heat exchange pipe may be formed as a fluid transfer pipe.

On the other hand, the revolution per minute (rpm) of the motor can be determined based on the frequency at which the magnetic field is applied to the magnetocaloric material through the magnetic field application unit.

In addition, a factor for calculating the resonance frequency may be determined such that the reciprocating frequency of the first piston based on the number of revolutions per minute of the motor is different from the resonance frequency of the self-cooling system.

Here, the resonance frequency may be a function of at least one of an elastic modulus of the elastic member, a mass of the heat transfer fluid, a mass of the first piston, and a mass of the second piston.

Furthermore, based on the reciprocating frequency of the first piston, the resonant frequency can be determined so that the reciprocating frequency is close to the resonant frequency.

That is, the resonance frequency may be determined such that the reciprocating frequency of the first piston has a value within a predetermined range from the resonance frequency.

At least one of the elastic modulus of the elastic member and the mass of the heat transfer fluid may be determined such that the reciprocating frequency of the first piston has a value within a predetermined range from the resonance frequency.

According to the present invention, it is possible to provide a self cooling system capable of securing a relatively high frequency of the circulation direction or flow direction switching of the heat transfer fluid.

Further, according to the present invention, it is possible to provide a self cooling system capable of obtaining a relatively large capacity of heat or cold heat through a heat exchange cycle.

Further, according to the present invention, it is possible to provide a self cooling system capable of reciprocating a heat transfer fluid in a cylinder through a simple structure using a crank assembly and a piston.

Also, according to the present invention, it is possible to provide a self cooling system capable of reducing power consumption by making the reciprocating frequency of the piston close to the resonance frequency of the self cooling system.

1 shows a conventional self-cooling system.
2 is a diagram showing a self cooling system according to the present invention.
3 is a diagram illustrating a self cooling system according to another embodiment of the present invention.
FIG. 4 is a view showing a state where the piston provided in the self-cooling system of FIG. 2 moves in a first direction; FIG.
5 is a view showing a state in which the piston provided in the self-cooling system of FIG. 2 moves in a second direction.

Hereinafter, an air conditioner according to the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown may be exaggerated or reduced have.

2 is a diagram showing a self cooling system according to the present invention.

Referring to FIG. 2, a magnetic cooling system 10 according to the present invention includes a cylinder 100 in which a heat transfer fluid is received, a magnetic calorific material 200 disposed in the cylinder 100, And a first piston 400 disposed at one side of the magnetocaloric material 200 in the cylinder 100. The magnetic field applying unit 300 may be formed of a magnetic material,

At this time, the heat transfer fluid stored in the cylinder 100 can pass through the magnetocaloric material 200 by the reciprocating motion of the first piston 400 along the longitudinal direction of the cylinder 100.

The cylinder 100 may have an internal space S1, S2 for receiving a heat transfer fluid. That is, the cylinder 100 may be formed with internal spaces S1 and S2 for receiving the heat transfer fluid.

The inner spaces S1 and S2 may be defined by the inner circumferential surface of the cylinder 100 and the first and second pistons 400 and 600, respectively.

The magnetocaloric material 200 may be provided in the cylinder 100 in the longitudinally central portion of the cylinder 100. For example, a partition wall 201 for the placement of the magnetocaloric material 200 may be provided in a longitudinally central portion of the cylinder 100 in the cylinder 100. Two partition walls 201 may be provided at a longitudinally central portion of the cylinder 100 by a predetermined distance. The magnetocaloric material (200) is disposed between the two partition walls (201).

Therefore, even though the heat transfer fluid passes through the magnetic calorie material 200, it can be fixed without being moved to the outside of the partition 201.

Further, the partition 201 is formed of a porous member, and the heat transfer fluid can pass through the partition 201.

The magnetocaloric material 200 may be formed to emit heat when a magnetic field is applied, and to absorb heat when a magnetic field is removed. Such magnetocaloric material 200 may be referred to as a magnetic substance. The magnetocaloric material 200 has already been well known, so a detailed description thereof will be omitted.

The magnetic field applying unit 300 may be formed to selectively apply a magnetic field to the magnetocaloric material 200. Specifically, the magnetic field application unit 300 applies a magnetic field to the magnetocaloric material 200 as the heat transfer fluid passes the magnetocaloric material 200 in a first direction, and a heat transfer fluid is applied to the magnetocaloric material 200 200) in the second direction to remove the magnetic field applied to the magnetocaloric material (200).

For example, the magnetic field applying unit 300 may be formed of an electromagnet. Therefore, a magnetic field can be applied to or blocked from the magnetocaloric material 200 by applying or interrupting a current to the magnetic field applying unit 300.

Alternatively, the magnetic field applying unit 300 may be formed of a permanent magnet. When the magnetic field applying unit 300 is formed of a permanent magnet, a magnetic field can be selectively applied to the magnetic calorific material 200 through a method of physically moving the magnetic field applying unit 300 (see FIG. 3).

The first piston 400 may be provided between the magnetocaloric material 200 and the first longitudinal end portion 101 of the cylinder 100 in the cylinder 100.

The first piston 400 may be formed to reciprocate at a predetermined distance between the first end portion 101 of the cylinder 100 and the magnetic calorific material 200. The heat transfer fluid can pass through the magnetocaloric material 200 by the reciprocating motion of the first piston 400 along the longitudinal direction of the cylinder 100.

For example, when the first piston 400 moves toward the magnetocaloric material 200, the magnetic field applying unit 300 may apply a magnetic field to the magnetocaloric material 200. In this case, the magnetocaloric material 200 undergoes an exothermic reaction, and the heat transfer fluid passing through the magnetocaloric material 200 in the moving direction of the first piston 400 absorbs heat generated from the magnetocaloric material 200 .

That is, in the illustrated embodiment, the heat transfer fluid flowing to the right side of the magnetocaloric material 200 in the cylinder 100 is heated, and the heat of the heated heat transfer fluid can be used for heating or the like.

Conversely, when the first piston 400 moves away from the magnetocaloric material 200, the magnetic field applying unit 300 may remove the magnetic field applied to the magnetocaloric material 200. That is, when the first piston 400 moves toward the first end 101 of the cylinder 100, the magnetic field applied to the magnetocaloric material 200 can be removed. In this case, the magnetocaloric material 200 undergoes an endothermic reaction, and the heat of the heat transfer fluid passing through the magnetocaloric material in the direction of movement of the first piston 400 can be absorbed by the magnetocaloric material 200.

That is, in the illustrated embodiment, the heat transfer fluid flowing to the left side of the magnetocaloric material 200 in the cylinder 100 is cooled, and the cold heat of the cooled heat transfer fluid can be used for cooling or freezing.

The magnetic cooling system 10 according to the present invention may further include a second piston 600 disposed on the opposite side of the first piston 400 with respect to the magnetocaloric material 200.

The second piston 600 may be provided in the cylinder 100 between the magnetocaloric material 200 and the second longitudinal end 102 of the cylinder 100.

The heat transfer fluid may be received between the first piston 400 and the second piston 600. More specifically, the inner spaces S1 and S2, in which the heat transfer fluid is received, may be partitioned by the inner circumferential surface of the cylinder 100 and the first piston 400 and the second piston 600. [ The magnetocaloric material 200 may be disposed between the first piston 400 and the second piston 600 in the cylinder 100.

The outer circumferential surface of the first piston 400 and the inner circumferential surface of the cylinder 100 may be sealed and the outer circumferential surface of the second piston 600 and the inner circumferential surface of the cylinder 100 may be seated. A sealing member (not shown) is provided between the outer circumferential surface of the first piston 400 and the inner circumferential surface of the cylinder 100, and between the outer circumferential surface of the second piston 600 and the inner circumferential surface of the cylinder 100 May be disposed.

The second piston 600 may be reciprocated in the longitudinal direction of the cylinder 100 in accordance with the reciprocating movement of the first piston 400. That is, the second piston 600 may be formed to reciprocate along the longitudinal direction of the cylinder 100 together with the first piston 400. That is, the second piston 600 may reciprocate in the same direction as the reciprocating motion of the first piston 400.

Therefore, the heat transfer fluid can pass through the magnetocaloric material 200 based on the reciprocating direction of the first piston 400 and the second piston 600. [

The self-cooling system 10 according to the present embodiment (i.e., the first embodiment) may further include a crank assembly 500 that reciprocates the first piston 400.

The crank assembly 500 may be configured to convert the rotational motion of the motor 510 into a reciprocating motion to reciprocate the first piston 400 along the longitudinal direction of the cylinder 100.

The crank assembly 500 includes a crankshaft 520 receiving a rotational force of the motor 510, a crank arm 530 connected to the crank shaft 520, and a connecting rod 550 connected to the crank arm 530 .

The crank shaft 520 may be connected to the motor 510 to receive the rotational force of the motor 510.

The crank arm 530 may be connected to the crank shaft 520 and may be formed to rotate together with the crank shaft 520.

The connecting rod 550 may be configured to convert the rotational motion of the crank arm 530 into a reciprocating motion.

More specifically, the crank assembly 500 may further include a crank pin 540. The crank pin 540 may be provided on the crank arm 530 by eccentricity from the crank shaft 520.

At this time, the first end of the connecting rod 540 may be connected to the crank pin 540, and the second end of the connecting rod 540 may be connected to the first piston 400.

Therefore, the rotational motion of the crankshaft 520 can be converted into the reciprocating motion of the connecting rod 540.

The self cooling system 10 according to the present embodiment may further include an elastic member 700 provided between the second piston 600 and the second longitudinal end portion 102 of the cylinder 100 have.

One end of the elastic member 700 may be fixed to the second piston 600 and the other end of the elastic member 700 may be fixed to the second end 102 of the cylinder 100. That is, the elastic member 700 may be formed to apply an elastic force to the second piston 600. For example, the elastic member 700 may be formed of an elastic spring.

Accordingly, when the first piston 400 moves toward the second end 102 of the cylinder 100, the heat transfer fluid moves the second piston 600 toward the second end 102 of the cylinder 100 The second piston 600 is also moved toward the second end 102 of the cylinder 100 by pushing.

When the first piston 400 moves toward the first end 101 of the cylinder 100, the elastic member 700 moves the second piston 600 toward the first end 101 of the cylinder 100 The second piston 600 is also moved toward the first end 101 of the cylinder 100.

The self-cooling system 10 includes a first heat exchange pipe 810 passing through a first space S1 between the first piston 400 and the magnetocaloric material 200 and a second heat exchange pipe 810 passing through the second piston 600, And a second heat exchange pipe (820) passing through the second space (S2) between the heat quantity materials (200).

The first heat exchange pipe 810 may be formed to heat exchange with the heat transfer fluid in the first space S1 and the second heat exchange pipe 820 may be formed to thermally exchange heat transfer fluid in the second space S2 .

At least one of the first heat exchange pipe 810 and the second heat exchange pipe 820 may be a heat pipe. For example, both the first heat exchange pipe 810 and the second heat exchange pipe 820 may be formed of heat pipes. In this case, the cold heat of the heat transfer fluid accommodated in the first space S1 can be transmitted to the outside through the first heat exchange pipe 810, and the heat of the heat transfer fluid accommodated in the second space S2 can be transmitted to the outside 2 heat exchange pipe (820).

Alternatively, at least one of the first heat exchange pipe 810 and the second heat exchange pipe 820 may be formed as a fluid transfer pipe. For example, both the first heat exchange pipe 810 and the second heat exchange pipe 820 may be formed as fluid transfer pipes. In this case, the heat of the heat transfer fluid accommodated in the first space S1 may be transferred to the fluid flowing through the first heat exchange pipe 810, Can be transferred to the second heat exchange pipe (820).

Of course, it is also possible that at least one of the first heat exchange pipe 810 and the second heat exchange pipe 820 is formed of a heat pipe and the other is formed of a fluid transfer pipe.

Meanwhile, as described above, the first piston 400 can reciprocate by the rotation of the motor 510. That is, the reciprocating frequency of the first piston 400 can be determined based on the revolutions per minute (rpm) of the motor 510.

At this time, the number of revolutions per minute of the motor 510 can be determined based on the frequency at which a magnetic field is applied to the magnetocaloric material 200 through the magnetic field applying unit 300.

That is, the rpm of the motor 510 can be adjusted according to the magnetic field application frequency of the magnetic field application unit 300. Here, the adjustment of the rpm of the motor 510 may mean the adjustment of the reciprocating frequency of the first piston 400. The rpm of the motor 510 and the magnetic field application frequency by the magnetic field application unit 300 can be controlled by a control unit (not shown).

As described above, since the rpm of the motor 510 can be adjusted according to the frequency at which the magnetic field applying unit 300 applies the magnetic field to the magnetocaloric material 200, it is possible to secure heat or cold heat from the heat transfer fluid for a predetermined period of time Can be increased compared with the conventional one, and the efficiency of securing the heat or the cold heat is increased.

It is preferable that the reciprocating frequency of the first piston 400 is different from the resonant frequency of the self cooling system 10. This is because when the reciprocating frequency of the first piston 400 becomes equal to the resonant frequency of the self cooling system 10, a large vibration may be generated in the self cooling system 10 itself.

That is, the factor for calculating the resonance frequency may be determined such that the reciprocating frequency of the first piston 400 based on the rpm of the motor 510 is different from the resonance frequency of the self cooling system 10.

Here, factors for calculating the resonance frequency include at least one of the elastic modulus K of the elastic member 700, the mass of the heat transfer fluid, the mass of the first piston 400, and the mass of the second piston 600 .

That is, the resonance frequency may be a function of at least one of the elastic modulus K of the elastic member 700, the mass of the heat transfer fluid, the mass of the first piston 400, and the mass of the second piston 600 .

Therefore, the elastic modulus K of the elastic member 700, the mass of the heat transfer fluid, the elastic modulus of the first piston 400, and the elastic modulus K of the elastic member 700 are set such that the reciprocating frequency of the first piston 400 is different from the resonant frequency of the self- And the mass of the second piston 600 may be adjusted.

At this time, the reciprocating frequency of the first piston 400 is preferably close to the resonance frequency. As the reciprocating frequency of the first piston 400 approaches the resonance frequency, the driving input of the motor 510 may be reduced. That is, as the reciprocating frequency of the first piston 400 approaches the resonance frequency, the electric power required for the motor 510 can be reduced.

The resonance frequency of the self cooling system 10 is determined by the elastic modulus K of the elastic member 700, the mass of the heat transfer fluid, the mass of the first piston 400 and the mass of the second piston 600, / RTI > of at least one of < RTI ID = 0.0 >

Thus, based on the reciprocating frequency of the first piston 400, the resonant frequency can be determined or adjusted such that the reciprocating frequency is close to the resonant frequency.

That is, since the rpm of the motor 510 and the reciprocating frequency of the first piston 400 are determined based on the frequency at which the magnetic field applying unit 300 applies the magnetic field to the magnetocaloric material 200, It is preferable to adjust the resonance frequency based on the reciprocating frequency of the resonator 400.

As described above, it is preferable that the reciprocating frequency of the first piston 400 is different from the resonance frequency, but close to the resonance frequency.

Specifically, the resonance frequency may be determined or adjusted so that the reciprocating frequency of the first piston 400 is within a predetermined range from the resonance frequency. That is, the resonance frequency may be adjusted so that the reciprocating frequency of the first piston 400 has a value within a predetermined range from the resonance frequency.

At this time, among the elastic modulus K of the elastic member 700, the mass of the heat transfer fluid, the mass of the first piston 400, and the mass of the second piston 600, which are factors for determining the resonance frequency, 400 and the mass of the second piston 600 are not easy to control.

Therefore, it is preferable to adjust at least one of the elastic modulus K of the elastic member 700 and the mass of the heat transfer fluid to change the resonance frequency.

That is, at least one of the elastic modulus K of the elastic member 700 and the mass of the heat transfer fluid is determined so that the reciprocating frequency of the first piston 400 has a value within a predetermined range from the resonance frequency Or can be adjusted.

Here, the adjustment of the elastic modulus K of the elastic member 700 may mean that the elastic member 700 is replaced.

Hereinafter, a structure for moving the magnetic field applying unit 300 described above will be described with reference to other drawings.

3 is a view showing a self cooling system according to another embodiment of the present invention (a second embodiment).

Hereinafter, a description will be made of a self-cooling system according to another embodiment of the present invention, focusing on a different part from the self-cooling system according to the first embodiment described with reference to FIG.

In the second embodiment, the magnetic field applying unit 300 may be formed of a permanent magnet. Therefore, in order to selectively apply a magnetic field to the magnetocaloric material 200, the magnetic field applying unit 300 needs to physically move to a predetermined frequency.

In order to move the magnetic field applying unit 300, the magnetic cooling system 10 according to the second embodiment may include a crank assembly 500 different from the first embodiment. The magnetic field applying unit 300 can reciprocate along the longitudinal direction of the cylinder 100 from the outside of the cylinder 100 by the crank assembly 500.

In this embodiment, the crank assembly 500 has a crank shaft 520 connected to the motor 510.

At this time, the crank shaft 520 may be provided with two crank arms 531 and 532. That is, the two crank arms 531 include a first crank arm 531 for reciprocating motion of the first piston 400 and a second crank arm 531 for reciprocating motion of the magnetic field applying unit 300 .

The first crank arm 531 and the second crank arm 532 may be spaced from each other along the longitudinal direction of the crank shaft 520.

A first connecting rod 551 may be connected to the first crank arm 531 and a second connecting rod 552 may be connected to the second crank arm 532.

Accordingly, the rotational motion of the crankshaft 520 due to the driving of the motor 510 can be converted into the reciprocating motion of the first connecting rod 551 and the second connecting rod 552.

The reciprocating motion of the first connecting rod 551 can reciprocate the first piston 400 in the cylinder 100 along the longitudinal direction of the cylinder 100.

The reciprocating motion of the second connecting rod 552 can reciprocate the magnetic field applying unit 300 along the longitudinal direction of the cylinder 100 from the outside of the cylinder 100.

The magnetic field applying unit 300 applies a magnetic field to the magnetic calorie material 200 so that the magnetic field applying unit 300 applies a magnetic field to the magnetic calorie material 200 when the first piston 400 moves toward the magnetic calorie material 200. [ .

That is, the crank assembly 500 moves the magnetic field applying unit 300 from the magnetocaloric material (not shown) to the outside of the cylinder 100 when the first piston 400 moves toward the magnetic calorie material 200 200, as shown in FIG.

The crank assembly 500 may further include direction switching rods 561 and 562 for switching the reciprocating direction. The direction changing rods 561 and 562 may be provided when necessary based on the extending directions of the first connecting rod 551 and the second connecting rod 552. [

That is, the arrangement of the motor 510 and the extending direction of the first connecting rod 551 and the second connecting rod 552 cause the first piston 400 and the magnetic field applying unit 300 to move from the cylinder The direction switching rods 561 and 562 can be used when the reciprocating motion is not possible along the longitudinal direction of the main body 100. [

The direction charging rods 561 and 562 include a first direction switching rod 561 connected to the first connecting rod 551 and a second direction switching rod 562 connected to the second connecting rod 552 .

The first direction switching rod 561 is provided between the first connecting rod 551 and the first piston 400 so that the reciprocating motion direction of the first connecting rod 551 is set to a length of the cylinder 100 Direction.

The second direction changing rod 562 is provided between the second connecting rod 552 and the magnetic field applying unit 300 so that the reciprocating motion direction of the second connecting rod 552 is changed to the length of the cylinder 100 Direction.

Although the structure in which the first connecting rod 551 and the second connecting rod 552 are interlocked with one motor 510 has been described in the illustrated embodiment, the first connecting rod 551 and the second connecting rod 552 May be interlocked with separate motors, respectively.

On the other hand, a yoke 301 whose position is fixed on the opposite side of the magnetic field applying unit 300 with respect to the cylinder 100 may be disposed. The yoke 301 may be disposed at a position corresponding to the magnetocaloric material 200 on the outside of the cylinder 100.

The yoke 301 may be formed of a metal. Therefore, when the magnetic field applying unit 300 moves to a position corresponding to the magnetocaloric material 200, a magnetic field (not shown) crossing the magnetocaloric material 200 is applied between the magnetic field applying unit 300 and the yoke 301, Can be formed.

Since the configuration other than the crank assembly 500 is the same as that of the first embodiment, a detailed description of other configurations will be omitted with reference to FIG.

Hereinafter, the manner in which the piston moves in the cylinder 100 will be described in detail with reference to other drawings.

FIG. 4 is a view showing a state where a piston provided in the self-cooling system of FIG. 2 moves in a first direction, FIG. 5 is a view showing a state where a piston provided in the self- to be.

For convenience of explanation, only the operating state of the first embodiment shown in Fig. 2 is shown, but the driving method of the pistons shown in Figs. 4 and 5 can be similarly applied to the second embodiment shown in Fig. 3 It is obvious.

4, the rotational motion of the crankshaft 520 by the motor 510 can be converted into the reciprocating motion of the first piston 400, and the first piston 400 is rotated by the cylinder 100, It is possible to reciprocate along the longitudinal direction.

When the first piston 400 moves toward the magnetocaloric material 200, the heat transfer fluid in the first space S1 may flow through the magnetocaloric material 200 and into the second space S2.

The second piston 600 is pushed toward the second end 102 of the cylinder 100 by the heat transfer fluid flowing into the second space S2. That is, when the first piston 400 moves toward the magnetocaloric material 200, the second piston 600 moves toward the second end 102 of the cylinder 100.

When the second piston 600 moves toward the second end 102 of the cylinder 100, the elastic member 700 provided between the second piston 600 and the second end 102 is compressed .

When the first piston 400 moves toward the magnetocaloric material 200, the magnetic field applying unit 300 may apply a magnetic field toward the magnetocaloric material 200.

For example, when the magnetic field applying unit 300 is formed of an electromagnet, a current may be applied to the magnetic field applying unit 300. Alternatively, when the magnetic field applying unit 300 is formed of a permanent magnet, the magnetic field applying unit 300 may be moved to a position corresponding to the magnetic calorie material 200. Here, the position corresponding to the magnetocaloric material 200 may mean a position at which the magnetic field generated by the magnetic field applying unit 300 crosses the magnetocaloric material 200.

At this time, the magnetocaloric material 200 undergoes an exothermic reaction, and the heat transfer fluid passing through the magnetocaloric material 200 may be heated through heat exchange with the magnetocaloric material 200.

The heated heat transfer fluid may flow into the second space S2 and exchange heat with the second heat exchange pipe 820 passing through the second space S2. The heat transferred from the heat transfer fluid to the second heat exchange pipe 820 can be used for heating and hot water supply.

5, when the first piston 400 moves away from the magnetocaloric material 200, the heat transfer fluid in the second space S2 passes through the magnetocaloric material 200 and flows into the first space S1).

That is, when the first piston 400 moves toward the first end 101 of the cylinder 100 by the rotation of the motor 510, the elastic member 700 moves the second piston 600 to the magnetocaloric material 200). The heat transfer fluid in the second space S2 passes through the magnetocaloric material 200 while being pushed toward the first end portion 101 of the cylinder 100 by the second piston 600, (S1).

In other words, when the first piston 400 moves toward the first end 101 of the cylinder 100 by the rotation of the motor 510, the elastic member 700 is extended, Toward the first end (101) of the housing (100). The second piston 600 pushes the heat transfer fluid in the second space S2 toward the first space S1 so that the heat transfer fluid in the second space S2 passes through the magnetocaloric material 200, And flows into the first space S1.

On the other hand, when the second piston 600 moves toward the magnetocaloric material 200, the magnetic field applying unit 300 can remove the magnetic field applied toward the magnetocaloric material 200. That is, when the heat transfer fluid flows from the second space S2 to the first space S1 through the magnetocaloric material 200, the magnetic field applied to the magnetocaloric material 200 by the magnetic field application unit 300 The magnetic field can be removed.

For example, when the magnetic field applying unit 300 is formed of an electromagnet, a current may be cut off to the magnetic field applying unit 300.

Alternatively, when the magnetic field applying unit 300 is formed of a permanent magnet, the magnetic field applying unit 300 may move away from the magnetocaloric material 200. [ That is, the magnetic field applying unit 300 may be moved from the magnetic calorie material 200 to a position shifted from the magnetic calorie material 200 so that the magnetic field generated by the magnetic field applying unit 300, which is a permanent magnet, have. In other words, the position of the magnetic field applying unit 300 may be moved such that the magnetic field generated in the magnetic field applying unit 300 does not cross the magnetic calorie material 200.

At this time, the magnetocaloric material 200 undergoes an endothermic reaction, and a heat transfer fluid passing through the magnetocaloric material 200 may be cooled through heat exchange with the magnetocaloric material 200.

The cooled heat transfer fluid may flow into the first space S1 and exchange heat with the first heat exchange pipe 810 passing through the first space S1. And may be used for cooling and cooling, transferring from the heat transfer fluid to the first heat exchange pipe 810, and the like.

As described above, according to the present invention, the frequency for switching the flow direction or flow direction of the heat transfer fluid can be secured relatively high, so that a relatively large capacity of heat or cold can be obtained.

According to the present invention, a heat transfer fluid can be reciprocated in a cylinder through a simple structure using a crank assembly and a piston, and the reciprocating frequency of the piston is close to the resonant frequency of the self cooling system, Consumption can be reduced.

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention, And additions should be considered as falling within the scope of the following claims.

100 cylinders 200 magnetic calorie material
300 magnetic field application part 400 first piston
500 crank assembly 600 Second piston
700 elastic member

Claims (17)

A cylinder having an inner space in which a heat transfer fluid is accommodated;
A magnetocaloric material disposed in the cylinder and configured to pass a heat transfer fluid;
A magnetic field applying unit configured to selectively apply a magnetic field to the magnetocaloric material;
A first piston disposed in the cylinder between the magnetocaloric material and a longitudinal first end of the cylinder;
A second piston disposed in the cylinder between the magnetocaloric material and a second longitudinal end of the cylinder;
A crank assembly for converting the rotational motion of the motor into a reciprocating motion and reciprocating the first piston along the longitudinal direction of the cylinder; And
And an elastic member provided between the second piston and the second longitudinal end of the cylinder,
A heat transfer fluid is received between the first piston and the second piston,
Wherein the heat transfer fluid passes through the magnetocaloric material by reciprocating movement of the first piston along a longitudinal direction of the cylinder. delete The method according to claim 1,
Wherein the second piston is formed to reciprocate in the same direction as the reciprocating direction of the first piston. delete The method according to claim 1,
The crank assembly includes:
A crankshaft receiving the rotational force of the motor;
A crank arm connected to the crankshaft and rotated together with the crankshaft; And
And a connecting rod for converting the rotational motion of the crank arm into a reciprocating motion. 6. The method of claim 5,
Wherein the crank assembly further comprises a crank pin eccentrically disposed from the crank shaft and provided to the crank arm,
Wherein a first end of the connecting rod is connected to the crank pin and a second end of the connecting rod is connected to the first piston. delete The method according to claim 1,
Wherein the elastic member is formed of an elastic spring so as to apply an elastic force to the second piston. The method according to claim 1,
A first heat exchange pipe passing through a first space between the first piston and the magnetocaloric material; And
And a second heat exchange pipe passing through a second space between the second piston and the magnetocaloric material. 10. The method of claim 9,
Wherein at least one of the first heat exchange pipe and the second heat exchange pipe is formed of a heat pipe. 10. The method of claim 9,
Wherein at least one of the first heat exchange pipe and the second heat exchange pipe is formed as a fluid transfer pipe. The method according to claim 1,
(Rpm) of the motor is determined based on a frequency at which a magnetic field is applied to the magnetocaloric material through the magnetic field applying unit. 13. The method of claim 12,
Wherein a factor for calculating the resonant frequency is determined such that the reciprocating frequency of the first piston based on the number of revolutions per minute of the motor is different from the resonant frequency of the self cooling system. 14. The method of claim 13,
Wherein the resonant frequency is a function of at least one of an elastic modulus of the elastic member, a mass of the heat transfer fluid, a mass of the first piston, and a mass of the second piston. 14. The method of claim 13,
Wherein the resonant frequency is determined such that the reciprocating frequency is close to the resonant frequency, based on the reciprocating frequency of the first piston. 14. The method of claim 13,
Wherein the resonance frequency is determined such that the reciprocating frequency of the first piston has a value within a predetermined range from the resonance frequency. 14. The method of claim 13,
Wherein at least one of the elastic modulus of the elastic member and the mass of the heat transfer fluid is determined such that the reciprocating frequency of the first piston has a value within a predetermined range from the resonance frequency.

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