KR20120084112A - Compact active magnetic regenerative refrigerator - Google Patents

Abstract

PURPOSE: A compact refrigerator of a self-regeneration type is provided to reduce a volume between a self regenerator and a low temperature heat exchanger such that the refrigerator is miniaturized. CONSTITUTION: A compact refrigerator of a self-regeneration type comprises an active regenerator(100), a permanent magnet(200), a low temperature heat exchanger(400), a high temperature heat exchanger(300). The active regenerator comprises magnetic refrigerants, which passes through the flow of a thermal conductor. The permanent magnet is formed on an outer circumference of the active regenerator. The permanent magnet generates a magnetic field by rotating. The low temperature heat exchanger is installed in the center of the active regenerator. The high temperature heat exchanger is installed in an end part of the active regenerator.

Description

Compact active magnetic regenerative refrigerator

The present invention relates to a compact active self regenerative refrigerator, and more particularly, an active magnetic regenerator comprising a first active magnetic regenerator and a second active magnetic regenerator, and a multi-layered permanent magnet composed of a first double layer permanent magnet and a second double layer permanent magnet. Since the magnets are arranged in series, the unnecessary volume between the magnetic regenerator and the low-temperature heat exchanger is reduced and formed in a compact and compact manner. The multilayer permanent magnet arrangement has a simpler operation method and a flow path connection method than other magnetic refrigeration systems. And, because it can give a relatively strong magnetic field change, it can be useful for improving the performance of the magnetic refrigeration system, by arranging the two pairs of permanent magnet array in series, using a single motor to drive two magnets at the same time Efficient operation, no invocation between active magnetic regenerator and heat exchanger Compact to minimize the space relates to active magnetic regenerative refrigeration.

Due to the current environmental and energy problems, studies on alternative refrigeration methods are being actively conducted. Among them, the magnetic refrigeration method is a new refrigeration method due to its high efficiency and the elimination of the use of a conventional refrigerant at all. . Magnetic refrigerator development research has been conducted in terms of the development of new magnetic refrigerant and the development of efficient and practical refrigeration systems.

Generally, magnetic refrigeration is a solid material having a magnetocaloric effect, hereinafter referred to as a magnetic refrigerant, and is a cooling method in which a magnetic field applied to the magnetic refrigerant is changed to obtain a freezing effect.

At room temperature, as a magnetic refrigerant, gadolinium (Gd) and various compounds (e.g., La (Fe _{1 - x} Si _x ) ₁₃ , La (Fe _1-x Co _x Si _y ) ₁₃ , La (Fe _{1 - x} Si _x ) ₁₃ H the _{y, Mn (As 0 .9 Sb} 0 .1), MnFe (P 0 .45 As 0 .55) , and so on) have been used.

Here, the active self-renewing refrigeration machine fills the magnetic refrigerant in a specific space in the form of powder, ribbon, plate, etc., and obtains a cooling effect by changing the magnetic field from the outside. It is a refrigeration system to move.

Such, magnetic refrigeration can be divided into reciprocating type (a) and rotary type (b), as shown in Figure 1 depending on the operating method, the reciprocating type (a) is a simple structure but there is a limit to increase the operating frequency, Rotation type (b) has the advantage of increasing operating frequency, but has the disadvantage of being relatively difficult to supply flow to a rotating system.

Referring to the reciprocating system using the method of operating the magnetic refrigerator as an example, as shown in FIG. 2, if the magnetic refrigerator operates as a reverse brayton cycle, the operation is performed in four processes as follows. First, as the magnetic regenerator 21 moves inside the magnet, the magnetic refrigerants are magnetized to increase the temperature. Next, a flow is supplied from the low temperature part while the regenerator 21 is stopped, thereby regenerating through heat exchange with the regeneration material. After the temperature of the material decreases, the magnetic refrigerant demagnetizes as the regenerator 21 leaves the outside of the magnet 22, further reducing the temperature.

Finally, the flow flowing from the high temperature section 23 to the low temperature section 24 exchanges heat with the regenerator 21, thereby lowering the temperature of the fluid. The fluid whose temperature is lowered thus absorbs heat from the outside in the low temperature part heat exchanger 24 to obtain a cooling effect.

In addition, there is a method using a multilayer permanent magnet arrangement that is slightly different from the above reciprocating and rotary type.

First, as shown in FIG. 3, the permanent magnets 31 and 32 are arranged concentrically to obtain a strong magnetic field at the center by properly arranging the pieces of permanent magnets 31 and 32 magnetized in different directions. It is a system that can change the magnetic field in the central part by rotating one.

If the magnetic fields generated by the two arrays are exactly the same size, the central magnetic field is the same as the sum of the magnetic fields generated in each array when located as shown in FIG. 3A, and one of the magnets is rotated by 180 ° to FIG. 3B. When arranged as follows, the center magnetic field is zero.

Therefore, by the continuous rotation, the sinusoidal magnetic field change can be obtained between the minimum and maximum magnetic fields. In other words, the use of such a magnet makes the overall shape of the system similar to a reciprocating magnetic refrigeration system, which simplifies the structure and eliminates the process of changing the rotational motion of the motor into a reciprocating motion. The advantage is easy to increase.

In addition, Figure 4 is a schematic diagram showing the overall shape of the magnetic refrigeration system using a multi-layered permanent magnet arrangement, such that the two-layered permanent magnet array using two pairs, each pair is rotated in the opposite phase with each other.

Therefore, the forces required to rotate each magnet can cancel each other, helping to increase the operating frequency and efficiency of the system.

However, the conventional scheme shown in FIG. 4 requires an additional dead volume for arranging the regenerator and the magnet to the side to connect the magnetic regenerator and the low temperature heat exchanger. 4, the diameter of the magnet increases exponentially as the intensity of the magnetic field generated in the magnet increases, so that the volume of the unnecessary space connecting the regenerator and the low temperature heat exchanger also increases exponentially. This increase in unnecessary space causes a problem that the performance of the system decreases due to an increase in pressure drop due to flow and heat inflow from the outside.

Document 1 Patent Publication No. 10-0737781 Document 2 Registered Patent Publication No. 10-0806716 Document 3 Patent Publication No. 10-0779197 Document 4 Published Patent Publication No. 10-2004-0062989

Document 1 K.A. Gschneidner, Jr, V. K. Pecharsky, Thirty years of near room temperature magnetic cooling: Where we are today and future prospects, International journal of refrigeration, vol. 31, pp. 945-961, (2008) Document 2 A. Rowe, A. Ture, Active maanetic regenerator performance enhancement using passive magnetic materials, Second international conference on magnetic refrigeration at room temperature, 2007, Slovenia

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

The active magnetic regenerator composed of the first active magnetic regenerator and the second active magnetic regenerator and the multilayered permanent magnet composed of the first double layered permanent magnet and the second double layered permanent magnet are arranged in series, thereby eliminating unnecessary volume between the magnetic regenerator and the low temperature part heat exchanger. Formed in a compact and compact way, the multi-layer permanent magnet array has a simpler operation method and a flow path connection method than other magnetic refrigeration systems, and can provide a relatively strong magnetic field change, thereby improving performance of the magnetic refrigeration system. It is an object of the present invention to provide a compact active self regenerative refrigerator which can be usefully used.

In addition, two pairs of permanent magnet arrays are arranged in series, and a single motor is used to drive two magnets at the same time for efficient operation, and compact active magnetic regeneration that minimizes unnecessary space between the active magnetic regenerator and the heat exchanger. Another object is to provide a food freezer.

In order to achieve the above object, the present invention provides an active magnetic regenerator (AMR) including a magnetic refrigerant passing through the flow of the heat conducting fluid;

A multi-layered permanent magnet formed at an outer circumference of the active magnetic regenerator and generating a magnetic field through rotation;

A low temperature part heat exchanger installed at the center of the active magnetic regenerator to supply cold heat to the outside;

A plurality of high temperature part heat exchangers installed at both ends of the active magnetic regenerator;

It relates to a compact active self-regenerative refrigerator characterized in that it comprises a.

As described above, the compact active magnetic regenerator of the present invention is an active magnetic regenerator composed of a first active magnetic regenerator and a second active magnetic regenerator, and a multi-layered permanent magnet composed of a first double layer permanent magnet and a second double layer permanent magnet. Since the magnets are arranged in series, the unnecessary volume between the magnetic regenerator and the low-temperature heat exchanger is reduced and formed in a compact and compact manner. The multilayer permanent magnet arrangement has a simpler operation method and a flow path connection method than other magnetic refrigeration systems. And, because it can give a relatively strong magnetic field change has an effect that can be usefully used to improve the performance of the magnetic refrigeration system.

In addition, by arranging two pairs of permanent magnet array in series, using a single motor to drive two magnets at the same time efficient operation is achieved, there is an effect of minimizing unnecessary space between the active magnetic regenerator and the heat exchanger.

1 is a schematic view showing the shape of a conventional reciprocating and rotary magnetic refrigerator;
Figure 2 is a schematic diagram showing an example of the operation of the conventional reciprocating self-renewing refrigerator,
3 is a schematic view showing a magnetic refrigerator using a conventional multilayered permanent magnet arrangement,
4 is a schematic view showing a detailed view of a conventional multilayered permanent magnet arrangement,
5 is a schematic view showing a compact active self regenerative refrigerator according to an embodiment of the present invention,
6 is a cross-sectional view illustrating a portion AA of FIG. 5.

The present invention has the following features to achieve the above object.

The present invention provides an active magnetic regenerator (AMR) including a magnetic refrigerant passing through a flow of a thermally conductive fluid;

A multi-layered permanent magnet formed at an outer circumference of the active magnetic regenerator and generating a magnetic field through rotation;

A low temperature part heat exchanger installed at the center of the active magnetic regenerator to supply cold heat to the outside;

And a plurality of high temperature part heat exchangers installed at both ends of the active magnetic regenerator.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Before describing the various embodiments of the present invention in detail with reference to the accompanying drawings, it can be seen that the application is not limited to the details of the configuration and arrangement of the components described in the following detailed description or shown in the drawings. will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

FIG. 5 is a schematic view showing a compact active self regenerative refrigerator according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view showing part A-A of FIG.

As shown in Figs. 5 and 6, the compact active self regenerative refrigerator of the present invention is an active magnetic regenerator (AMR) 100, a multi-layered permanent magnet 200, a low temperature part heat exchanger 400, a plurality of It is composed of a high temperature heat exchanger 300 and a flow feeder (500).

As shown in FIG. 5, the active magnetic regenerator (AMR) includes a magnetic refrigerant through which a heat conductive fluid flows, and a magnetic body formed of magnetic refrigerant (Gd, etc.) is filled in a cylindrical case. In this case, the heat conducting fluid transferred from the flow supplier 500 passes through and heat exchanges with the magnetic refrigerant. In this case, the magnetic refrigerant is filled in the form of powder, mesh, ribbon, and the like.

Here, the active magnetic regenerator 100 is composed of a first active magnetic regenerator 110 and a second active magnetic regenerator 120, as shown in FIG. 5, wherein the first active magnetic regenerator 110 and the second active magnetic regenerator 110 are used. The magnetic regenerators 120 are arranged in series with each other to be spaced apart from each other at predetermined intervals.

In addition, a low temperature part heat exchanger 400 is installed between the first active magnetic regenerator 110 and the second active magnetic regenerator 120 spaced apart from each other, and the low temperature part heat exchanger 400 and the first active part are installed in contact with each other. The magnetic regenerator 110 and one side of the second active magnetic regenerator 120 penetrate each other.

In addition, both ends of the active magnetic regenerator 100, that is, one end of the first active magnetic regenerator 110 and the second active magnetic regenerator 120, that is, the opposite end connected to the low temperature part heat exchanger 400. The high temperature part heat exchanger 300 is installed in each part. In this case, the high temperature part heat exchanger 300 is also connected to communicate with each of the first active magnetic regenerator 110 and the second active magnetic regenerator 120.

As shown in FIGS. 5 and 6, the multilayer permanent magnet 200 is formed on the outer circumference of the active magnetic regenerator 100 to generate a magnetic field through rotation, and the first multilayer permanent magnet 210 includes: It is composed of a second multi-layered permanent magnet 220.

Here, the first multilayer permanent magnet 210 and the second multilayer permanent magnet 220 are formed to be arranged in series with each other, and are spaced apart from each other at predetermined intervals, respectively, the first active magnetic regenerator 110 and the second active magnet. The outer periphery of the magnetic regenerator 120 is provided.

The first multilayer permanent magnet 210 and the second multilayer permanent magnet 220 each have a predetermined interval on the outer circumference of the first active magnetic regenerator 110 and the second active magnetic regenerator 120 as shown in FIG. 6. The inner permanent magnets 230 are formed to be spaced apart and rotated, and the outer permanent magnets 240 are fixed to the outer periphery of the inner permanent magnets 230 by a predetermined interval.

In addition, the inner permanent magnet 230 of the first double-layered permanent magnet 210 and the inner permanent magnet 230 of the second double-layered permanent magnet 220 are interconnected by the connecting portion 600 so as to rotate simultaneously in the same rotational direction. The outer permanent magnet 240 of the first double layered permanent magnet 210 and the outer permanent magnet 240 of the second double layered permanent magnet 220 are fixed and are not rotated.

As shown in FIG. 5, the flow feeder 500 is connected to each of the high temperature part heat exchanger 300 to supply a thermal conductive fluid. The flow feeder 500 is operated in accordance with the rotation of the multilayer permanent magnet 200. The thermally conductive fluid is supplied to the high temperature part heat exchanger 300.

Here, the flow supplier 500 is connected to both sides of the flow pipe 510 so as to be connected to the hot heat exchanger 300, the flow pipe 510 is respectively connected to one end surface of the plurality of hot heat exchanger (300) To supply heat conductive fluid to both sides.

As such, the first double layered permanent magnet 210 and the second double layered permanent magnet 220 are rotated at the same speed while being positioned in opposite directions for the first time as shown in FIG. Magnetization and demagnetization occur in the film.

As such, when one of the first active magnetic regenerator 110 and the second active magnetic regenerator 120 is heated by magnetization and demagnetization, the cycle of cooling the other is repeated. . That is, the first active magnetic regenerator 110 and the second active magnetic regenerator 120 repeat heating, cooling, heating, and cooling, respectively.

In this way, while the heating-cooling-heating-cooling is repeated, the heating is heat exchanged with the high temperature part heat exchanger 300, and the cooling is heat exchanged with the low temperature part heat exchanger 400, and the low temperature part heat exchanger 400 supplies cold heat to the outside. Thus, the present invention is an active self-renewing refrigerator.

100: active magnetic player 110: first active magnetic player
120: second active magnetic regenerator 200: double-layered permanent magnet
210: first double layer permanent magnet 220: second double layer permanent magnet
230: inner permanent magnet 240: outer permanent magnet
300: high temperature part heat exchanger 400: low temperature part heat exchanger
500: flow feeder 510: flow path
600: connection

Claims (7)

An active magnetic regenerator (AMR) 100 including a magnetic refrigerant through which a heat conducting fluid flows;
A multi-layered permanent magnet 200 formed at an outer circumference of the active magnetic regenerator 100 to generate a magnetic field through rotation;
A low temperature part heat exchanger (400) installed at the center of the active magnetic regenerator (100) to supply cold heat to the outside;
A plurality of high temperature part heat exchangers 300 installed at both ends of the active magnetic regenerator 100;
Compact active self-renewing refrigerator characterized in that comprises a.
The method of claim 1,
The active magnetic regenerator (AMR, 100) is a compact active magnetic regenerator characterized in that the first active magnetic regenerator (110) and the second active magnetic regenerator (120) are formed in series with each other.
The method of claim 1,
The multi-layered permanent magnet 200 is a compact active self-refrigerating refrigerator, characterized in that the first two-layered permanent magnet 210 and the second two-layered permanent magnet 220 are formed in series with each other.
The method according to claim 1 or 3,
The multi-layered permanent magnet 200 is formed by fixing a predetermined interval on the outer periphery of the active magnetic regenerator 100, the inner permanent magnet 230 and a predetermined interval formed on the outer periphery of the inner permanent magnet 230 is fixed Compact active magnetic regenerated refrigeration freezer characterized in that it comprises an outer permanent magnet (240).
The method of claim 4, wherein
The inner permanent magnet 230 of the first double-layered permanent magnet 210 and the inner permanent magnet 230 of the second double-layered permanent magnet 220 are connected to each other by a connection part 600 to be rotated at the same time in the same rotation direction, Compact active self-refrigerating refrigerator, characterized in that the outer permanent magnet 240 of the first two-layer permanent magnet 210 and the outer permanent magnet 240 of the second two-layer permanent magnet 220 is fixed and not rotated.
The method of claim 1,
Compact active self-refrigerating refrigeration refrigerator characterized in that the flow feeder 500 is connected to each of the high-temperature unit heat exchanger 300 to supply a heat conducting fluid.
The method according to claim 6,
The flow feeder 500 has a flow path tube 510 connected to both sides, and the flow path pipe 510 is connected to one end surface of the plurality of high temperature heat exchangers 300, respectively. Freezer.

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