KR101634293B1

KR101634293B1 - Magnetic cooling apparatus using mce material and imce material

Info

Publication number: KR101634293B1
Application number: KR1020150059792A
Authority: KR
Inventors: 이민하; 김송이
Original assignee: 한국생산기술연구원
Priority date: 2015-04-28
Filing date: 2015-04-28
Publication date: 2016-07-01

Abstract

The present invention relates to a magnetic cooling apparatus using a magnetocaloric effect (MCE) material and an inverse-magnetocaloric effect (IMCE) material. The magnetic cooling apparatus using an MCE material and an IMCE material comprises: a magnetic field unit which applies a magnetic field or stops the application of the magnetic field; an IMCE unit which includes an IMCE material; an MCE unit which includes an MCE material; and a drive unit which allow the MCE unit and the IMCE unit to come in contact with each other or to be separated from each other according to the case that the magnetic field is applied or the case that the application of the magnetic field is stopped. Therefore, the present invention miniaturizes the apparatus and prevents corrosion problems as refrigerants are not used.

Description

MAGNETIC COOLING APPARATUS USING MCE MATERIAL AND IMCE MATERIAL USING MCE MATERIAL AND IMCE MATERIAL

The present invention relates to a MCE material capable of providing a cooling function using a material having a magnetocaloric effect (MCE) and a material having an IMCE (Inverse Magnetocaloric Effect) .

As is well known, the self-cooling technique is a technique of cooling (freezing) an object using the magnetic calorie effect (MCE) of a magnetic material. When a strong magnetic field is externally applied to the ferromagnetic material, And when the magnetic field is cut off, the temperature of the ferromagnetic material is lowered.

The conventional cooling method uses an exothermic and cooling cycle due to compression and expansion of a gas to cool the object. The self-cooling technique uses a magnetic calorie effect (MCE) of the magnetic material, The magnetic moments are aligned within the magnetic body to lower the magnetic entropy, and the total entropy conservation law increases the lattice entropy.

This increase in lattice entropy leads to an increase in the lattice vibration, which causes the temperature of the magnetic body in the magnetic field to rise. At room temperature self-cooling, the water is circulated to release heat and the temperature of the magnetic body falls, When stopped, the magnetic moment inside the magnetic body is disorderly arranged and the temperature is lowered. At this time, when the object is connected to the object (heat load) of the refrigerator or the freezer, the temperature of the object is lowered and the temperature of the magnetic material is absorbed by the heat.

The conventional self-cooling apparatus using the above-described principle is a system in which at least one magnetic regenerator including a magnetic material reciprocates or rotates inside and outside of a magnet to cause a temperature change of a magnetic material included in the magnetic regenerator To provide a cooling function.

However, in the conventional self-cooling device, it is necessary to provide a compressor, a vaporizer, and the like for cooling by using a coolant such as liquid helium, liquid nitrogen, water or the like in order to remove the heat generated by the magnetic regenerator including the magnetic material. For example, it is difficult to miniaturize the size of the self-cooling device for application to household appliances, cooling devices in a limited space, automobiles, airplanes, spacecraft, etc., and corrosion due to the use of refrigerant occurs.

1. Registration No. 10-0647852 (Registered on November 3, 2006): Magnetic refrigerator 2. Registration No. 10-0716007 (Registered on May 2, 2007): Active magnetic refrigerator

The present invention provides a cooling function using an MCE unit including a material having a magnetic calorimetric effect (MCE) and an IMCE unit including a material having an inverse magnetic calorimetric effect (IMCE), thereby miniaturizing the apparatus, It is desirable to provide a self cooling device using MCE material and IMCE material that can solve the corrosion problem in advance.

Further, according to the present invention, when the magnetic field is applied, the MCE unit is cooled through the IMCE unit, and when the magnetic field application is stopped, the IMCE unit is brought into contact with the IMCE unit to cool the IMCE unit, And a self cooling device using IMCE material.

In the meantime, according to the present invention, when application of a magnetic field is interrupted, the MCE unit is cooled through the MCE unit. When the magnetic field is applied, the MCE unit is brought into contact with the IMCE unit to cool the MCE unit, And a self-cooling device using IMCE material.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description .

According to an embodiment of the present invention, there is provided a magnetic field sensor comprising: a magnetic field unit for applying a magnetic field or stopping application of a magnetic field; an IMCE unit including an IMCE (Inverse-Magnetocaloric Effect) material; an MCE unit including a magnetocaloric effect And a driving unit for contacting or disconnecting the MCE unit and the IMCE unit when the magnetic field is applied or when the application of the magnetic field is interrupted, may be provided.

The present invention provides a cooling function using an MCE unit including a material having a magnetic calorimetric effect (MCE) and an IMCE unit including a material having an inverse magnetic calorimetric effect (IMCE), thereby miniaturizing the apparatus, The corrosion problem can be solved in advance.

In addition, the present invention provides a magnetic cooling device that provides a main cooling function through an IMCE unit. The IMCE unit cools the IMCE unit when the magnetic field is applied and the IMCE unit is brought into contact with the IMCE unit when the magnetic field application is stopped. By cooling, the cooling cycle can be efficiently operated.

In the magnetic refrigerator that provides the main cooling function through the MCE unit, the MCE unit is cooled through the MCE unit when the application of the magnetic field is interrupted. When the MCE unit is brought into contact with the MCE unit, The cooling cycle can be efficiently operated.

1 is a view illustrating a self-cooling device using an MCE material and an IMCE material according to a first embodiment of the present invention,
2A to 2D are views for explaining the characteristics of the MCE material and IMCE material according to the first embodiment of the present invention,
FIGS. 3A to 3E are views illustrating an operation process of the MCE material and the magnetic cooling device using the IMCE material according to the first embodiment of the present invention,
4A and 4B are views illustrating a cooling unit of a MCE material and a self-cooling device using IMCE material according to a second embodiment of the present invention,
FIGS. 5A to 5E are views illustrating an operation process of the MCE material and the self-cooling device using the IMCE material according to the third embodiment of the present invention,
6A and 6B are views illustrating a cooling unit of a MCE material and a self cooling device using IMCE material according to a fourth embodiment of the present invention.

Advantages and features of embodiments of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

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

FIG. 1 is a view illustrating a self-cooling device using an MCE material and an IMCE material according to a first embodiment of the present invention. FIGS. 2a to 2d illustrate the MCE material and IMCE material characteristics according to the first embodiment of the present invention FIGS. 3A to 3E are views illustrating the operation of the MCE material and the magnetic cooling device using the IMCE material according to the first embodiment of the present invention. Referring to FIG.

Referring to FIGS. 1, 2A to 2D, and 3A to 3E, the magnetic refrigerator using the MCE material and the IMCE material according to the first embodiment of the present invention includes a magnetic field unit 110, an IMCE unit 120, An MCE unit 130, a drive unit 140, a cooling unit 150, and the like.

The magnetic field unit 110 includes a permanent magnet, an electromagnet, a superconducting magnet, etc., and applies a magnetic field or stops applying a magnetic field to the IMCE unit 120 and the MCE unit 130, The magnetic field generating unit 120 and the MCE unit 130 can generate and apply a magnetic field.

When the IMCE unit 120 and the MCE unit 130 to be described later are positioned between the N pole magnet and the S pole magnet when the permanent magnet is used, the IMCE unit 120 is cooled and the MCE unit 120 The IMCE unit 120 generates heat when the IMCE unit 120 and the MCE unit 130 move to a position deviating from the N pole magnet and the S pole magnet and simultaneously the MCE unit 130 is cooled .

When a current is applied to a coil wound on the outside of a housing including the IMCE unit 120 and the MCE unit 130 when an electromagnet or a superconducting magnet that generates a magnetic field by applying a current is used, When the IMCE unit 120 is cooled and the MCE unit 130 generates heat and the current applied to the coil wound on the outside of the housing is blocked, the IMCE unit 120 generates heat and simultaneously the MCE unit 130 Can be cooled.

The IMCE unit 120 includes an IMCE (Inverse-Magnetocaloric Effect) material that is cooled when a magnetic field is applied and is heated when an application of a magnetic field is stopped. When the magnetic field is applied from the magnetic field unit 110, (E.g., including at least one selected from the group consisting of water, alcohol, ethylene glycol, liquid metal, and helium) of the unit 150, and may self-heat when the application of the magnetic field is interrupted.

As shown in FIG. 2A, when the magnetic field is applied (B _on ) in a state (? T = 0), the IMCE material is cooled down to a b state (? T = -) As the heat load increases, the temperature gradually rises and the c-state (ΔT

0), and when the application of the magnetic field is interrupted (B _off ), a d state (ΔT = +) in which the heat is generated and the temperature rises becomes such that the temperature falls as the heat is discharged , The IMCE material has the characteristic that the cooling and the heating are circulated in accordance with the application of the magnetic field and the stop of the magnetic field application.

Here, the IMCE material includes a Ni-Mn based alloy, an La based alloy, and the like. The Ni-Mn based alloy includes a Ni-Mn-Ga based alloy, a Ni-Mn-In-Co based alloy, The IMCE material may be prepared by vacuum casting, powder metallurgy or the like, and the IMCE material produced by the powder metallurgy method may be used as a heat transfer fluid It is known that it has pores with excellent permeability to flow and excellent heat absorption and release characteristics.

The IMCE unit 120 may be provided in the form of an IMCE bulk material or a powder filled in the housing. When the magnetic field is applied from the magnetic field unit 110, a heat transfer fluid Thereby cooling the heat transfer fluid.

In addition, when the magnetic field applied from the magnetic field unit 110 is interrupted, heat is generated. This heat can be efficiently removed because the MCE unit 130, which will be described later,

The MCE unit 130 includes a magnetocaloric effect (MCE) material that generates heat when a magnetic field is applied and is cooled when application of a magnetic field is stopped. When the magnetic field is applied from the magnetic field unit 110, And the IMCE unit 120 can be cooled by being brought close to the IMCE unit 120 that generates heat through the drive unit 140 when the application of the magnetic field is interrupted.

As shown in FIG. 2B, when the magnetic field is applied (B _on ) in a state (? T = 0), the MCE material is heated to a b state (? T = +) As the temperature decreases, the c-state (ΔT

0), and when the application of the magnetic field is interrupted (B _off ), the cooling state becomes a d state (? T = -) in which the temperature decreases and the temperature gradually rises in accordance with the heat load of the refrigerator a state, the MCE material is characterized in that heat generation and cooling are circulated in accordance with application of a magnetic field and interruption of magnetic field application.

Here, the MCE material includes a Gd-based alloy, and the Gd-based alloy may include a Gd-Si-based alloy and a Gd-Si-Ge-based alloy. Such a MCE material may be obtained by vacuum casting, powder metallurgy And the MCE material produced by the powder metallurgy method has a pore having excellent permeability to the flow of the heat transfer fluid and is known to have excellent heat absorption and discharge characteristics.

The MCE unit 130 may be provided in the form of a MCE bulk material or a powder filled in the housing. When a magnetic field is applied from the magnetic field unit 110, the MCE unit 130 generates heat. The heat transfer fluid, which exchanges heat with the IMCE unit 120, The cooling effect of the self-cooling device according to the embodiment of the present invention is not affected since the influence on the cooling of the heat transfer fluid is insignificant.

The MCE unit 130 is cooled when the magnetic field applied from the magnetic field unit 110 is interrupted so that the MCE unit 130 contacts the IMCE unit 120 in a cooled state to easily cool the IMCE unit 120 The heat generation of the IMCE unit 120 can be effectively eliminated even when there is no other configuration (for example, a compressor, a vaporizer, etc.) necessary for cooling in the conventional manner.

In other words, in the self-cooling device according to the first embodiment of IMCE unit 120 as shown in Fig. 2c and 2d to provide the primary cooling function when the contact (Bonding), the magnetic field is applied (B _on) removed (Debonding), the contact of the magnetic field applied to the stop (B _off) when the contact MCE unit 130 consisting of a heat generation problem to occur in IMCE unit 120 together when the by repeatedly circulating (Bonding), stops the magnetic field is applied Can be easily solved through.

The driving unit 140 includes a linear motor and moves linearly. The driving unit 140 is coupled to a side surface of the MCE unit 130, and when the magnetic field is applied, the IMCE unit 120 and the MCE unit 130 are separated And moves the MCE unit 130 to contact the IMCE unit 120 when the application of the magnetic field is interrupted and moves the IMCE unit 120 and the MCE unit 130 to be separated when the magnetic field is applied again .

The driving unit 140 as described above has been conventionally disclosed in various configurations and forms according to linear movement, rotational movement, and the like, and thus a detailed description thereof will be omitted.

The cooling unit 150 is connected to the cooling consumer through the circulation tube in which the IMCE unit 120 is directly connected to the cooling demand source or the IMCE unit 120 circulates the heat transfer fluid, Can be cooled.

For example, the cooling unit 150 may utilize a heat transfer fluid comprising at least one of water, alcohol, ethylene glycol, liquid metal, and helium, and the cooled heat transfer fluid through the IMCE unit 120 may be used as a cooling source The heat transfer fluid is heat-exchanged with the IMCE unit 120 cooled through the application of a magnetic field to cool the heat transfer fluid. The cooled heat transfer fluid is transferred to the cooling demand source to provide a cooling function, and then circulates in the direction of the IMCE unit 120 (Circulation direction: arrow direction).

This cooling unit 150 may be provided with a circulating tube through which the heat transfer fluid is circulated to connect between the IMCE unit 120 and the cooling consumer which is in the form of passing through the IMCE unit 120, And a shape that is in contact with a side surface of the substrate.

Here, the circulation tube is shown in the form of a spring, which is shown in a spring form for the sake of understanding, but needless to say, it is not limited thereto.

3A to 3E, when the magnetic field is applied from the magnetic field unit 110, the operation of the MCE material having the structure as described above and the magnetic cooling device using the IMCE material will be described. The IMCE material filled in the IMCE unit 120 is cooled and the heat transfer fluid circulating (circulation direction: arrow direction) inside the cooling unit 150 can be cooled.

At this time, although the MCE material filled in the MCE unit 130 generates heat, since the MCE material is located at a position spaced apart from the circulation tube through which the heat transfer fluid circulates, the effect on the cooling of the heat transfer fluid is negligible have.

Then, when the magnetic field applied from the magnetic field unit 110 is interrupted (Off), the IMCE unit 120 is heated and the MCE unit 130 is cooled as shown in FIG. 3B.

3C, when the MCE unit 130 is linearly moved through the driving unit 140 and positioned close to the IMCE unit 120, the heated IMCE unit 120 is moved to the cooled MCE unit 120, (130), the heat of the IMCE unit (120) can be efficiently cooled through the MCE unit (130).

Next, when the magnetic field is applied again as shown in FIG. 3D, the IMCE unit 120 is cooled and the MCE unit 130 is heated. At this time, the MCE unit 130 is cooled The MCE unit 130 can be linearly moved through the drive unit 140 to a certain distance from the IMCE unit 120 so as not to affect the heat transfer fluid of the unit 150. [

Therefore, the present invention can provide a cooling function by using an MCE unit including a material having a magnetic calorimetric effect (MCE) and an IMCE unit including a material having an inverse magnetic calorimetric effect (IMCE), thereby miniaturizing the apparatus , Since it does not use refrigerant, corrosion problems can be solved in advance.

In the first embodiment of the present invention, the cooling unit 150 cools the heat transfer fluid in accordance with the cooling of the IMCE unit 120. However, as shown in FIGS. 4A and 4B, In the magnetic refrigerator using the MCE material and the IMCE material according to the second embodiment, when the application of the magnetic field is interrupted, the MCE unit 130 moves close to the IMCE unit 120, and the cooling unit 150 ' If a magnetic field is applied when a circulating tube through which a heat transfer fluid is circulated, the MCE unit 130 cools the heat transfer fluid through the IMCE unit 120 and stops the heat generation of the IMCE unit 120 The cooling efficiency can be further improved by cooling through heat exchange with the heat transfer fluid circulated inside the cooling unit 150 'while being cooled to be removed.

Next, the MCE material according to the third embodiment, in which the MCE unit including the MCE material provides the main cooling function, and the self cooling device using the IMCE material will be described.

FIGS. 5A through 5E are views illustrating an operation process of the MCE material and the self-cooling device using the IMCE material according to the third embodiment of the present invention. Here, the MCE material according to the third embodiment of the present invention and the self cooling device using the IMCE material perform the same functions as the respective constituent parts according to the first embodiment of the present invention. .

5A to 5E, when a magnetic field is applied from the magnetic field unit 210, the MCE material filled in the MCE unit 230 generates heat as shown in FIG. 5A, and the IMCE unit 220 may be cooled.

5B, when the IMCE unit 220 is linearly moved through the driving unit 240 to be brought into close contact with the MCE unit 230, the MCE unit 230, which has been heated, By cooling through the unit 220, the heat of the MCE unit 230 can be efficiently cooled through the IMCE unit 220.

Then, when the magnetic field applied from the magnetic field unit 210 is stopped (off), the IMCE unit 220 is heated and the MCE unit 230 is cooled as shown in FIG. 5C.

5D, the IMCE unit 220 is connected to the MCE unit 230 via the driving unit 240 at a certain distance from the MCE unit 230, so that the IMCE unit 220 does not affect the heat transfer fluid of the cooling unit 250. In this case, And can be linearly moved so as to be spaced apart.

Here, since the IMCE material filled in the IMCE unit 220 is exothermic, it is found that the influence on the cooling of the heat transfer fluid is insignificant because the heat transfer fluid is located at a position spaced apart from the circulating tube through which the heat transfer fluid circulates have.

Next, when the magnetic field is applied again as shown in FIG. 5E, the IMCE unit 220 is cooled and the MCE unit 230 is heated as in the state of FIG. 5A. As shown in FIG. 5B, By moving the IMCE unit 220 in a straight line through the cooling unit 240 and bringing the MCE unit 230 into close contact with the MCE unit 230 by cooling the cooled MCE unit 230 through the cooled IMCE unit 220, (230) can be efficiently cooled through the IMCE unit (220).

Further, in the magnetic refrigerator that provides the main cooling function through the MCE unit, the MCE unit cools the MCE unit when the application of the magnetic field is interrupted. When the magnetic field is applied, the MCE unit contacts the IMCE unit, The cooling cycle can be efficiently operated.

In the third embodiment of the present invention, the cooling unit 250 cools the heat transfer fluid by cooling the MCE unit 230. However, as shown in FIGS. 6A and 6B, In the magnetic refrigerator using the MCE material and the IMCE material according to the fourth embodiment, when the application of the magnetic field is interrupted, the IMCE unit 220 moves close to the MCE unit 230 and the cooling unit 250 ' If the application of the magnetic field is stopped when the circulation tube through which the heat transfer fluid is circulated, the IMCE unit 220 cools the heat transfer fluid through the MCE unit 220, and when the magnetic field is applied, By cooling through heat exchange with the heat transfer fluid circulated inside the cooling unit 250 'while cooling to remove, the cooling efficiency can be further improved.

In the first to fourth embodiments of the present invention, the magnetic cooling device using the MCE material and the IMCE material is arranged from the bottom to the top in the order of the magnet, the MCE unit, the IMCE unit, and the magnet. It is needless to say that it is possible to provide a self cooling device having a circular shape arranged in the order of magnets, MCE units, IMCE units, and magnets in the outermost circumferential direction of the cylinder, and correspondingly, various motors, gears, It is needless to say that the configuration of the drive unit, the cooling unit,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be readily apparent that such substitutions, modifications, and alterations are possible.

110, 210: magnetic field unit 120, 220: IMCE unit
130, 230: MCE unit 140, 240: Drive unit
150, 250: cooling unit

Claims

An IMCE unit including an IMCE (Inverse-Magnetocaloric Effect) material cooled upon application of a magnetic field and extinguished upon application of a magnetic field,
An MCE unit including an MCE (Magnetocaloric Effect) material that generates heat upon application of a magnetic field and is cooled upon termination of magnetic field application,
A magnetic field unit for applying a magnetic field to the IMCE unit and the MCE unit or stopping application of the magnetic field,
And a drive unit coupled to the IMCE unit or the MCE unit for contacting or disconnecting the MCE unit and the IMCE unit when the magnetic field is applied or when the application of the magnetic field is interrupted,
Wherein the MCE unit and the IMCE unit are mutually heat-exchanged when they are in contact with each other.

The method according to claim 1,
The self-
The IMCE unit is connected to a cooling demand source to cool the cooling unit
A magnetic cooling device using an MCE material and an IMCE material.

The method according to claim 1,
The self-
Wherein the IMCE unit is connected to a cooling demander to cool the cooling demander through a heat transfer fluid,
A magnetic cooling device using an MCE material and an IMCE material.

The method of claim 3,
Wherein the MCE unit cools the IMCE unit only or cools the IMCE unit while cooling the IMCE unit together.

The method according to claim 1,
The self-
A cooling unit connected to the MCE unit for cooling the cooling unit;
A magnetic cooling device using an MCE material and an IMCE material.

The method according to claim 1,
The self-
The MCE unit is connected to a cooling demand source to cool the cooling demand through a heat transfer fluid.
A magnetic cooling device using an MCE material and an IMCE material.

The method according to claim 6,
Wherein the IMCE unit cools the MCE unit only or cools the MCE unit while cooling the heat transfer fluid together.

8. The method according to any one of claims 1 to 7,
Wherein the magnetic field unit includes any one of a permanent magnet, an electromagnet, and a superconducting magnet to generate and apply the magnetic field to the IMCE unit and the MCE unit.

8. The method according to any one of claims 1 to 7,
The MCE material is a self cooling device using an MCE material including a Gd alloy and an IMCE material.

10. The method of claim 9,
The Gd-based alloy is a self-cooling device using an MCE material and IMCE material including a Gd-Si-based alloy or a Gd-Si-Ge-based alloy.

8. The method according to any one of claims 1 to 7,
The IMCE material is a self cooling device using an MCE material and an IMCE material including a Ni-Mn based alloy or an La based alloy.

12. The method of claim 11,
Wherein the Ni-Mn alloy includes a Ni-Mn-Ga alloy or a Ni-Mn-In-Co alloy,
The La-based alloy is a self-cooling device using an MCE material and an IMCE material including an La-Fe-Si-H alloy.