JP2012237478A - Regenerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a regenerator that not only can store at least two kinds of granular storage mediums on an axial perpendicular cross sectional face of the regenerator in a separated state but also can largely enhance the degree of freedom of the arrangement of the granular storage mediums in the axial section of the regenerator when at least the two kinds of granular storage mediums are assembled and stored in the regenerator.SOLUTION: The regenerator 100A stores at least two kinds of granular storage mediums 14, 15, and 16 in a tube body 9 in a state that the granular storage mediums are separated from one another. At least a part of an area in the axial direction of the regenerator is arranged in a state that at least two kinds of granular storage mediums 15 and 16 are separated in the axial perpendicular section of the regenerator 100A.

Description

  The present invention relates to a GM (Gifford McMahon) refrigerator, a pulse tube refrigerator, a Stirling cycle refrigerator, a Birmier cycle refrigerator, a Solvay cycle refrigerator, an Ericsson cycle refrigerator, or a refrigeration system using this in a precooling stage. The present invention relates to a cryogenic regenerator and refrigerator suitable for use in, and the like, and a regenerator used for a superconducting electromagnet device, an MRI device, a cryopump and the like using the same.

2. Description of the Related Art Conventionally, techniques for reducing the temperature of gas by adiabatic expansion of an inert gas and storing the cold energy in a regenerator are used in various fields.
Fields using such a cooling mechanism, for example, GM refrigerator, pulse tube refrigerator, Stirling cycle refrigerator, Birmier cycle refrigerator, Solvay cycle refrigerator, Ericsson cycle refrigerator, or the precooling stage In the fields related to cryogenic regenerators and refrigerators suitable for use in refrigeration systems, and superconducting electromagnet devices, MRI devices, cryopumps, etc. using the same, they have high refrigerating efficiency and high refrigerating capacity. A regenerator has been desired.

An example of the cold heat generation mechanism using the regenerator according to the present invention will be described in detail with reference to FIG.
FIG. 12 is a schematic diagram showing an outline of a refrigerator that is an example of a cold temperature generating mechanism that can use the regenerator according to the present invention.
This regenerator is used, for example, in the two-stage GM refrigerator 1, and, for example, as shown in FIG. 12, high-pressure refrigerant gas from the compressor 6 passes through the high-pressure gas pipe 7a through the high-pressure gas valve 23a. After being supplied from the first-stage cylinder 2 to the second-stage cylinder 3, it is used for storing cold heat generated in the process of being recovered by the compressor 6 through the high-pressure gas valve 23b and the high-pressure gas pipe 7b.
In the refrigerator 1 as shown in FIG. 12, a first-stage regenerator 2a and a two-stage regenerator 3a are accommodated in a first-stage cylinder 2 and a second-stage cylinder 3, respectively. Is driven by the drive motor 4 to reciprocate in the vertical direction of the paper in FIG. 12, and at this time, the lower ends of the first stage regenerator 2a and the second stage regenerator 3a are cooled. It is structured.
The two-stage regenerator 3a accommodates a granular or mesh substance made of one or more kinds of metals, alloys, ceramics, etc. as the two-stage regenerator material 3b.
The cooling unit of the refrigerator 1 as described above includes a first-stage regenerator 2a and a two-stage regenerator 3a respectively accommodated in a first-stage cylinder 2 and a second-stage cylinder 3 that are integrally formed continuously. The first-stage cooling stage 2c at the lower end of the stage regenerator 2a (position indicated by the symbol R in FIG. 12) is cooled to about 40K, and the second stage (position indicated by the symbol Q in FIG. 12) at the lower end of the two-stage cylinder 3 The cooling stage 3c is cooled to, for example, 7K or less. Therefore, in the following specification, the end portion disposed on the first stage cooling stage 2c side of the first stage cylinder 2 of the two-stage regenerator 3a is referred to as a high temperature end side (position indicated by a symbol P in FIG. 12). An end portion of the two-stage regenerator 3a disposed on the second-stage cooling stage 3c side is referred to as a cold / warm end side (a position indicated by a symbol Q in FIG. 12).
Although not specifically shown, an electric heater is attached to the two-stage cooling stage 3c, and the cooling capacity of the two-stage cooling stage 3c can be measured by applying a heat load by the electric input.

In the refrigerator 1 shown in FIG. 12, the high-pressure gas supplied to the first-stage cylinder 2 is supplied from the gas passage 2d into the first-stage regenerator 2b, and the high-pressure gas in the second-stage cylinder 3 is two-stage from the gas passage 3d. It is a mechanism that is supplied into the regenerator 3a. The spaces formed at the lower ends of the first-stage regenerator 2a and the two-stage regenerator 3a are a first-stage expansion space 2e and a two-stage expansion space 3e for adiabatic expansion of the high-pressure gas. Further, a seal 5 is provided on the outer periphery of the first-stage regenerator 2a to enhance the airtightness when the high-pressure gas is adiabatically expanded. Further, a seal is also provided between the second-stage regenerator 3a and the second-stage cylinder 3, but the description thereof is omitted in FIG.
As the prior art relating to the two-stage regenerator 3a (hereinafter simply referred to as the regenerator) used in the cooling mechanism represented by the refrigerator 1 as described above, the following is known. It has been.

Patent Document 1 discloses an invention relating to a cryogenic regenerator and refrigerator under the name of “cryogenic regenerator and refrigerator”.
2 stage regenerator 31 disclosed in Patent Document 1, will be described with reference as the sign of the literature, as the cold accumulating material 32, in addition to lead 32A, 12 to 30% of HoCu ₂ (magnetic regenerator material) at a volume ratio 32B and 15 to 31% of GOS32C are filled.
According to the invention disclosed in Patent Document 1 having the above-described configuration, as a cold storage material other than lead, HoCu ₂ and GOS are used together in an appropriate volume ratio, thereby reducing the influence of the induced magnetic field and providing excellent refrigeration. It has the effect that ability can be demonstrated.

Patent Document 2 describes a cryogenic refrigerator that generates cold by expanding the refrigerant gas by a reciprocating motion of a displacer (substitution) in a cylinder, and is called “cryogenic refrigerator”. An invention relating to an improved technique of a cryogenic refrigerator of a type in which a regenerator for storing a part is built in a displacer is disclosed.
When the cryogenic refrigerator disclosed in Patent Document 2 is described using the reference numerals described in the document as they are, the cylinder 5 is fitted into the cylinder 5 so as to be able to reciprocate and expands into the cylinder 5. And a displacer 18 that defines the chambers 20 and 21, and the reciprocating motion of the displacer 18 causes the refrigerant gas supplied from the compressor to expand in the expansion chambers 20 and 21 to lower the temperature. In the cryogenic refrigerator in which the refrigerating gas is stored by passing through the regenerators 28 and 29 built in the displacer 18, the regenerators 28 and 29 store a large number of metal regenerator materials 31 in the container 30. The partition members 32, 32a, 32b having air permeability and non-conductivity are provided at predetermined positions, and the partition members 32, 32a are The regenerators 28 and 29 are arranged in parallel with the refrigerant gas passage direction.
According to the invention disclosed in Patent Document 2, by dividing the regenerator with the partition member, the generated magnetic field as a whole can be remarkably reduced, and furthermore, since eddy currents are suppressed, heat generation can also be suppressed. The cooling efficiency can be increased, and the manufacture of the regenerator can be simplified.

JP 2001-248929 A Japanese Patent Laid-Open No. 9-145180

In the above-mentioned Patent Document 1, as a method for arranging individual granular regenerator materials when accommodating a plurality of types of granular regenerator materials in a state where they are separated from each other in the regenerator, granular regenerator materials are arranged in the axial direction of the regenerator. Only the technical content of accommodating in a stacked state is disclosed.
On the other hand, in the above-mentioned Patent Document 2, although the technical content of disposing a partition member perpendicularly or horizontally to the axial direction of the regenerator is disclosed in the regenerator, in the regenerator disclosed in Patent Document 2 The granular regenerator material used is only one type (lead).
Furthermore, the invention disclosed in Patent Document 2 is not originally a technique for simultaneously storing two or more types of granular regenerator materials, and the “object of the invention” of the invention disclosed in Patent Document 2 is a regenerator. When two or more kinds of granular regenerator materials are accommodated in the inside, it is not intended to increase the degree of freedom of the arrangement of the granular regenerator materials in the axial section of the regenerator.

Therefore, even if those skilled in the art try to construct a regenerator that contains a combination of a plurality of types of granular regenerator materials, the technical content disclosed in Patent Document 1 described above may be combined with the technical content disclosed in Patent Document 2. , One type of granular regenerator material is accommodated between partition members 32b and 32b disclosed in FIG. 2 of Patent Document 2, and a plurality of types of granular regenerator materials are stacked in the axial direction of the regenerator. Only knowledge was obtained, and as a result, the degree of freedom of the storage position of the granular regenerator material in the axial direction of the regenerator could not be greatly increased.
In addition, in the case where a plurality of types of granular regenerator materials are accommodated in the regenerator and a plurality of types of granular regenerator materials are stacked in the axial direction of the regenerator, a detailed description will be given later. Since the arrangement of the regenerator in the axial direction is determined to some extent by the specific heat of the material constituting the granular regenerator used, it is difficult to change the arrangement of the granular regenerator freely in the axial cross section of the regenerator. It was.
Therefore, even if the technical content disclosed in Patent Document 1 is combined with the technical content disclosed in Patent Document 2, the degree of freedom of arrangement of the granular regenerator material in the axial cross section of the regenerator can be greatly increased. There wasn't.

  The present invention has been made in response to such a conventional situation, and an object of the present invention is to make it possible to accommodate at least two kinds of granular regenerator materials in a state where they are separated from each other in the axial vertical cross section of the regenerator, thereby at least An object of the present invention is to provide a regenerator capable of greatly increasing the degree of freedom of arrangement of the granular regenerator material in the axial section of the regenerator when the two types of granular regenerator materials are combined and accommodated in the regenerator.

In order to achieve the above object, a regenerator according to claim 1 is a regenerator in which at least two types of granular regenerator materials are accommodated in a cylinder in a state where they are separated from each other, and the axial direction of the regenerator At least a part of the region is arranged in a state where at least two kinds of granular regenerator materials are separated from each other in a vertical cross section in the axial direction of the regenerator.
In the invention having the above-described configuration, the cylindrical body has an action of accommodating and holding at least two kinds of granular regenerator materials therein and flowing a high-pressure gas (heat exchange gas) having a heat exchange action therein. The granular regenerator material has an effect of increasing the surface area of the regenerator material by increasing the shape of the regenerator material, increasing the contact area with the heat exchange gas, and efficiently storing cold energy. Furthermore, by using a plurality of types of granular regenerator materials made of different materials, it has the effect of allowing cold energy of different temperature regions having high specific heat to be stored in one regenerator at the same time.
In addition, in at least a part of the region in the axial direction of the regenerator, by disposing at least two types of granular regenerator materials in the axial vertical cross section of the regenerator in a separated state, a plurality of types in the axial cross section of the cylinder It has the effect | action that it becomes possible to make arrangement | positioning of granular regenerator material into forms other than "lamination | stacking".

A regenerator according to a second aspect of the present invention is a regenerator in which at least two kinds of granular regenerator materials are accommodated in a cylinder in a state of being separated from each other, and the axial cross section of the regenerator has at least two kinds. The granular regenerator material has a region arranged in parallel in the axial direction of the regenerator.
In the invention having the above-described configuration, the action of the cylindrical body and the granular cold storage material is the same as the action of the cylindrical body and the granular cold storage material described in claim 1.
Further, in the axial cross section of the regenerator, at least a part of the granular regenerator material has a region arranged in parallel in the axial direction of the regenerator, so that at least part of the region in the axial direction of the regenerator, It has the effect | action of arrange | positioning the at least 2 type of granular cold storage material in the state isolate | separated in the axial direction vertical cross section of a cool storage.
Therefore, the invention described in claim 2 has the same action as the invention described in claim 1.

A regenerator according to a third aspect of the present invention is a regenerator in which at least two kinds of granular regenerator materials are accommodated in a state of being separated from each other in the cylinder, and the cylinder is inserted into the cylinder. The granular regenerator material provided with at least one second cylinder and housed inside the second cylinder and the granular regenerator material arranged outside the second cylinder are different types of granular regenerator materials. It is characterized by this.
In the invention of the above configuration, the action of the cylinder and the granular cold storage material is the same as the action of the cylinder and the granular cold storage material described in claim 1.
Further, in the invention according to claim 3, the second cylinder has an action of accommodating at least one kind of the granular regenerator material therein. Thereby, it has the effect | action of isolate | separating and accommodating other granular cool storage materials inside a certain granular cool storage material.
Thereby, in the axial cross section of the regenerator of claim 3, a region is formed in which at least two kinds of granular regenerator materials are arranged in a state of being arranged in the axial direction of the regenerator. As a result, at least two types of granular regenerator materials are separated and arranged on the vertical cross section in the axial direction of the regenerator in at least a part of the region in the axial direction of the regenerator.
Therefore, the invention described in claim 3 has the same action as the invention described in claim 1.

A regenerator according to a fourth aspect of the present invention is the regenerator according to the first or second aspect, wherein the first granular regenerator material Pb is accommodated on the high temperature end side of the cylinder, and the cylinder HoCu ₂ which is the second granular regenerator material is accommodated on the low temperature end side of the gas, and Gd ₂ O ₂ S which is the third granular regenerator material is accommodated in the _second granular regenerator material. It is.
In addition to the same action as the invention described in claim 1 or claim 2, the invention having the above-described configuration is such that Pb, which is the first granular regenerator, efficiently cools about 10 to 40 K on the high temperature end side of the cylindrical body. It has the effect of storing cold well. This is due to the characteristic that the specific heat is high and the heat capacity is large in that temperature range. Hereinafter, for the same reason, HoCu ₂ which is the second granular cold storage material has an effect of efficiently storing cold heat of about 7 to 10 K on the low temperature end side of the cylindrical body. Further, a third particulate cold accumulating material Gd 2 _O 2 _S has the effect of efficiently cool storage the cold of the order of 3~5K at the low temperature end of the tubular body.
In addition, the use of Gd 2 _O 2 _S as the third particulate cold accumulating material, compared with the case of replacing all of the third particulate cold accumulating material to the second particulate cold accumulating material, regenerator of claim 4, wherein This has the effect of reducing the manufacturing cost of the product.
Then, the third granular regenerator material is included in the second granular regenerator material on the cold end side of the cylinder, so that the first, second, and third granular regenerator materials are arranged in this order in the cylinder. The regenerator efficiency of the regenerator according to claim 4 is improved as compared with a regenerator (disclosed in Patent Document 1) arranged in a state of being laminated from the high temperature end side toward the cold temperature end side in the axial direction of the body. Has the effect of causing

The regenerator according to claim 5 is the regenerator according to claim 3, wherein Pb as the first granular regenerator material is accommodated on the high temperature end side of the cylinder, and on the low temperature end side of the cylinder. HoCu ₂ as the second granular regenerator material is accommodated, and at least one second cylinder is inserted into the second granular regenerator material, and the third granular regenerator material is inserted into the second cylinder. Gd ₂ O ₂ S is accommodated.
The invention configured as described above has the same effect as that of the invention described in claim 3. The action of the first, second and third granular regenerators in the invention of claim 5 is the same as the action of the first, second and third granular regenerators in the invention of claim 4. is there.
Even in the invention according to claim 5, by using Gd ₂ O ₂ S which is the third granular regenerator, compared to the case where all of the third granular regenerator is replaced with the second granular regenerator, The manufacturing cost of the regenerator according to claim 4 is reduced.
And the invention of Claim 5 is accommodated in the 2nd granular cold storage material in the 2nd granular cold storage material in the cold end side of a cylindrical body similarly to the invention of Claim 4, and the 3rd granular cold storage material is By adopting the included arrangement, the first, second, and third granular regenerators were arranged in this order in a state of being laminated from the cold end side to the high temperature end side on the axis of the cylinder. Compared to a regenerator (disclosed in Patent Document 1), it has the effect of improving the regenerator efficiency of the regenerator according to claim 5.

A regenerator according to a fifth aspect of the present invention is the regenerator according to any one of the first to fifth aspects, wherein the at least two types of granular regenerator materials are arranged in an axially vertical cross section. The average particle size of at least two types of granular regenerator materials is different.
The invention having the above-described configuration has the same action as that of each of the first to fifth aspects. Further, in the invention according to claim 6, “the average particle diameter of at least two types of granular regenerator materials is different in an axial vertical cross section in which at least two types of granular regenerator materials are arranged” is contained in a cylinder. When there are two types of granular cold storage materials, for example, it means that the average particle diameters of the two types of granular cold storage materials are not the same. Moreover, for example, when there are three types of granular regenerator materials accommodated in the cylindrical body, the case where the average particle diameters of the three types of granular regenerator materials are all different from each other, and one of the three types of granular regenerator materials is granular. There are two patterns where only the average particle size of the regenerator material is different. Furthermore, when there are four types of granular regenerator materials accommodated in the cylindrical body, for example, when at least one of the three types of granular regenerator materials has a different average particle diameter, and four types of granular regenerator materials There are both patterns when the average particle diameters of all are different.
In the invention according to claim 6, the filling rate of the granular regenerator material having a relatively small average particle diameter is obtained by using a plurality of kinds of granular regenerator materials accommodated in the cylinder having different average particle diameters. It has the effect | action which raises. Thereby, it has the effect | action of enabling design of the cool storage efficiency of the granular cool storage material by changing the average particle diameter of a granular cool storage material.
Further, in the invention according to claim 6, even when the average particle size of at least one granular regenerator material among the granular regenerator materials accommodated in the cylinder is reduced, all of the axial vertical cross-sections of the cylinders are averaged. Since it is not necessarily filled with one kind of granular regenerator material having a small particle diameter, that is, even when the average particle size of at least one granular regenerator material contained in the tubular body is reduced, Since there is always a region made of other granular regenerator material having an average particle size larger than that in the vertical cross section in the axial direction, it prevents the fluidity of the heat exchange gas from significantly decreasing in the cylinder. Have.

According to invention of Claim 1 or Claim 2 of this invention, another granular cold storage material can be included in one granular cold storage material. Thereby, when configuring a regenerator by combining a plurality of types of granular regenerator materials, it is possible to realize an arrangement other than an arrangement in which individual granular regenerator materials are simply stacked on the axial cross section of the cylindrical body. Therefore, the freedom degree of arrangement | positioning of the multiple types of granular cold storage material in a cylinder can be raised significantly. In addition, there are a plurality of temperature regions in which specific heat increases by using a plurality of types of granular regenerator materials, and it is possible to improve the regenerator capacity.
As a result, the regenerator efficiency of the regenerator can be improved only by changing the arrangement of the existing granular regenerator material in the cylinder.
That is, it is possible to provide a regenerator having a higher refrigeration capacity at a manufacturing cost comparable to that of a conventional regenerator.

The invention described in claim 3 uses the second cylindrical body in the invention described in claims 1 and 2 when the other granular cold storage material is placed in one granular cold storage material. The effect is the same as that of the first aspect of the invention.
In addition, by using an existing metal tube as the second cylinder, the manufacture of the regenerator according to claim 3 can be facilitated and the manufacturing cost can be reduced.

According to the invention described in claim 4, in addition to the same effect as that of the invention described in claim 1, the first, second, and third granular regenerators are arranged in this order in the high temperature end on the axis of the cylinder. The refrigerating capacity can be improved as compared with a regenerator (a regenerator disclosed in Patent Document 1) laminated from the side toward the cold end side.
That is, according to invention of Claim 4, even when it replaces a part of 2nd granular cold storage material with the 3rd granular cold storage material, the refrigerating capacity consists only of the 1st and 2nd granular cold storage material. Can be close to a regenerator.
Therefore, it is possible to provide a regenerator having a higher refrigerating capacity while using the same granular regenerator material as in the past.

The invention according to claim 5 has the same effect as the invention according to claim 3.
The invention according to claim 5 is the one in which the second cylindrical body is used for the separation of the second regenerator material and the third regenerator material in the invention according to claim 4. This has the same effect as the present invention.

According to the invention described in claim 6, in addition to the same effects as the inventions described in claims 1 to 5, the average particle size is smaller while maintaining the fluidity of the heat exchange gas in the cylinder. The filling rate of the granular regenerator material can be increased.
Thereby, when the average particle diameter of a specific granular cool storage material is made small and the accommodation ratio is made large, it can prevent that the cool storage efficiency of a cool storage device falls.

(A) is sectional drawing of the regenerator which concerns on Example 1 of this invention, (b) is a perspective view which shows arrangement | positioning of the granular cool storage material in the inside of the regenerator which concerns on Example 1 of this invention, ( c) It is an AA arrow directional cross-sectional view in FIG.1 (b). It is a graph which shows the relationship between the temperature of each thermal storage material, and specific heat. It is the graph which compared the refrigerating capacity in each temperature in the regenerator which concerns on Example 1 of this invention, and the regenerator which concerns on a comparative example. (A), (b) shows the kind and arrangement | positioning in a 1st cylinder of the granular regenerator material in the regenerator which concerns on the comparative example used for the refrigerating capacity test of the regenerator which concerns on Example 1 of this invention. It is a conceptual diagram. It is the graph which compared the refrigerating capacity in each temperature in the regenerator which concerns on Example 1 of this invention, and the regenerator which concerns on a comparative example. It is the figure which showed arrangement | positioning and the ratio of each granular regenerator material accommodated in the regenerator tested for the refrigerating capacity test of the regenerator which concerns on Example 1 of this invention. (A) ~ (e) is a perspective view showing another example of any arrangement of HoCu ₂ grain and GOS grains in the interior of the regenerator according to the first embodiment of the present invention. (A) is a conceptual diagram which shows the external shape of the granular cool storage material aggregate | assembly in the inside of the regenerator which concerns on Example 2 of this invention, (b)-(d) are all the cool storage which concerns on Example 2 of this invention. It is sectional drawing which shows the example of arrangement | positioning of the granular cool storage material inside a container. (A)-(c) is sectional drawing which shows the example of arrangement | positioning of the granular cool storage material in the inside of the cool storage device which concerns on Example 2 of this invention. (A)-(c) is sectional drawing which shows the example of arrangement | positioning of the granular cool storage material in the inside of the cool storage device which concerns on Example 2 of this invention. (A), (b) is sectional drawing which shows the example of arrangement | positioning of the granular cool storage material in the inside of the cool storage device which concerns on Example 2 of this invention. It is a schematic diagram which shows the outline of the refrigerator which is an example of the cold temperature generation | occurrence | production mechanism which can use the regenerator which concerns on this invention.

  The regenerator according to the embodiment of the present invention will be described in detail with reference to Example 1 and Example 2.

The regenerator according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.
The regenerator according to the present invention is used in a device or mechanism having a cooling mechanism represented by the refrigerator 1 as shown in FIG. 12, and in addition to the one shown in FIG. For example, a cryogenic cold storage suitable for use in a pulse tube refrigerator, a Stirling cycle refrigerator, a Burmese cycle refrigerator, a Solvay cycle refrigerator, an Ericsson cycle refrigerator, or a refrigeration system using this in a precooling stage. The present invention can be used for a refrigerator, a refrigerator, a superconducting electromagnet device, an MRI device, a cryopump and the like using the same.
The regenerator according to the present invention is particularly characterized by the arrangement of a plurality of types of granular regenerator materials accommodated in the cylinders constituting the regenerator as compared with the regenerator according to the prior art.
Fig.1 (a) is sectional drawing of the regenerator which concerns on Example 1 of this invention, (b) is a perspective view which shows arrangement | positioning of the granular cool storage material in the inside of the regenerator which concerns on Example 1 of this invention. (C) is an AA arrow directional cross-sectional view in FIG.1 (b).
As shown in FIGS. 1A to 1C, the regenerator 100 </ b> A according to the first embodiment is a high temperature end side of the metal first cylindrical body 9 (a side indicated by a symbol P in FIG. 1A). ) Is filled to the middle of the first cylindrical body 9, and the Pb grain 14 of the granular regenerator material is filled on the Pb grain 14 and at the low temperature end side of the first cylindrical body 9 (FIG. 1 ( a) the end side of the side indicated by the symbol Q) is filled with HoCu ₂ grains 15 of the granular regenerator material, and further on the axis of the first cylindrical body 9, the granular regenerator material in the HoCu ₂ grains 15 A rod-shaped lump made of GOS grains 16 is included. GOS is an abbreviation for Gd ₂ O ₂ S that constitutes the granular regenerator material.
As described above, the granular regenerator material aggregate 101 accommodated in the first cylindrical body 9 is composed of the Pb particles 14, the HoCu ₂ particles 15, and the GOS particles 16.

Further, in the regenerator 100A according to the first embodiment, as shown in FIG. 1A, the first cylindrical body 9 is allowed to flow while allowing the high-pressure gas (heat exchange gas) to flow in the first cylindrical body 9. In order to accommodate and hold the granular regenerator material assembly 101 therein, the first cylindrical body 9 has a high temperature end side (see P in FIG. 1) and a low temperature end side (see Q in FIG. 1). ) Each of the air-permeable laminate including the first mesh body 11 having a coarse mesh, the felt 13 which is a non-woven fiber layer, and the second mesh body 12 having a finer mesh than the first mesh body 11. 102 is provided.
Furthermore, at the boundary between the two types of granular regenerators stacked in the axial direction of the first cylinder 9, the two types of granular regenerators are separated while allowing the flow of high-pressure gas in the first cylinder 9 In order to achieve this, a ventilation separation layer 103 in which the second mesh body 12 is disposed is disposed on the upper and lower surfaces of the felt 13 that is a non-woven fiber layer.
The configuration of the ventilation laminate 102 is merely an example, and the structure of the ventilation laminate 102 can accommodate and hold the granular regenerator material assembly 101 in the first cylindrical body 9, and As long as it allows inflow of high-pressure gas into one cylinder 9 and discharge of high-pressure gas from the first cylinder 9, the individual elements constituting the gas-permeable laminate 102 and the combination thereof can be freely set. It is possible to change. In addition, with respect to the configuration of the ventilation separation layer 103, the high-pressure gas in the first cylinder 9 is separated while reliably separating a plurality of types of granular regenerator materials that are stacked and accommodated in the axial direction of the first cylinder 9. If it is configured so as not to hinder the flow, it is possible to freely change the individual elements constituting the ventilation separation layer 103 and the combination thereof.

Furthermore, in the regenerator 100A according to the first embodiment, as shown in FIG. 1A, the separation between the HoCu ₂ grains 15 accommodated in the first cylinder 9 and the GOS grains 16 contained therein is separated. Is performed by the second cylinder 10 having a smaller diameter than the first cylinder 9.
More specifically, in the regenerator 100 </ b> A according to the first embodiment, the ventilation stack 102 is provided on the high temperature end side of the first cylindrical body 9, the Pb particles 14 are filled, and then the air separation is performed on the Pb particles 14. A layer 103 is provided, and a second cylinder 10 having a smaller diameter than the first cylinder 9 is inserted into the first cylinder 9 on the ventilation laminate 102, The HoCu ₂ grains 15 are filled between the second cylinders 10, and the ventilation laminate 102 is attached to the low temperature end side of the first cylinder 9. The hollow portion of the second cylinder 10 is filled with the GOS grains 16, and the gas-permeable laminates 102 are provided at both ends thereof to prevent the GOS grains 16 from flowing out of the second cylinder 10. ing. That is, in the regenerator 100 </ _b > A according to the first embodiment, the HoCu ₂ grains 15 and the GOS grains 16 in the first cylinder 9 are separated by the second cylinder 10.
In the case where a plurality of types of granular regenerator materials are separated using the second cylinder 10 in the first cylinder 9, the above-described ventilation lamination is also applied to each of both end portions of the second cylinder 10. A body 102 may be provided to accommodate and hold the granular regenerator material while allowing the flow of high-pressure gas in the second cylinder 10.
Further, FIG. 1A shows a granular regenerator between the ventilation laminate 102 provided at the end of the first cylinder 9 and the ventilation laminate 102 provided at the end of the second cylinder 10. Is provided as an example, but between the ventilation laminate 102 provided at the end of the first cylinder 9 and the ventilation laminate 102 provided at the end of the second cylinder 10. A granular regenerator material (in the case of the regenerator 100A according to the first embodiment, for example, HoCu ₂ grains 15) may be provided.

In the regenerator 100 </ b> A according to the first embodiment, as shown in FIG. 1C, the granular regenerator material aggregate 101 accommodated in the first cylinder 9 is the center of the first cylinder 9. In the axial section of the shaft 17, not only the HoCu ₂ grains 15 but also the GOS grains 16 are stacked on the Pb grains 14. At this time, the HoCu ₂ grains 15 and the GOS grains 16 are juxtaposed in the axial direction of the first cylinder 9 in the axial section of the first cylinder 9.
That is, the axial cross section of the regenerator 100A according to the first embodiment has a region in which at least two types of granular regenerator materials are arranged in parallel in the axial direction of the regenerator 100A (first cylinder 9). It becomes a state.
In other words, in other words, the regenerator 100A according to the first embodiment includes the first cylinder 9 in at least a part of the region in the axial direction of the regenerator 100A (first cylinder 9). It can also be expressed that at least two types of granular cold storage materials are separated and arranged in the vertical cross section in the axial direction (see FIG. 1B).

Here, the granular regenerator material used for the regenerator 100A according to the first embodiment will be described.
FIG. 2 is a graph showing the relationship between the temperature and specific heat of each heat storage material. In FIG. 2, the X axis represents temperature (K), and the Y axis represents specific heat (J / cm ³ K).
Among the three types of heat storage materials shown in FIG. 2, Pb and HoCu ₂ were found to have a tendency to increase in specific heat as the temperature increased in a region exceeding 10K.
On the other hand, in the temperature range of 5 to 10K, the specific heat of HoCu ₂ is relatively high, and GOS has a particularly high specific heat when it is about 4 to 5K.
In the cooling mechanism represented by the refrigerator 1 shown in FIG. 12, the temperature of the high-pressure gas (heat exchange gas) on the high temperature end side (the side indicated by the symbol P in FIG. 12) of the two-stage regenerator 3a. Is about 40K, and when the inside of the two-stage regenerator 3a flows from the high temperature end side toward the low temperature end side, heat is exchanged by the regenerator material accommodated in the two-stage regenerator 3a and the two-stage regenerator On the low temperature end side of 3a (the side indicated by symbol Q in FIG. 12), the temperature of the high pressure gas (heat exchange gas) is cooled to 7K, depending on the material of the regenerator material accommodated in the two-stage regenerator 3a. Is possible.
Therefore, considering the cooling mechanism as described above, the Pb particles 14 are accommodated on the high temperature end side (the side indicated by the symbol P in FIG. 12) of the two-stage regenerator 3a shown in FIG. In the state where the respective granular regenerators are stacked in the axial direction of the two-stage regenerator 3a in the order of HoCu ₂ grains 15 and GOS grains 16 toward the low temperature end side (the side indicated by the symbol Q in FIG. 12) of the apparatus 3a. Containment is also considered the most reasonable and best.

However, in the two-stage regenerator 3 a shown in FIG. 12, three types of granular regenerator materials, Pb particles 14, HoCu ₂ particles 15, and GOS particles 16, are arranged in this order at the high temperature end in the axial section of the first cylindrical body 9. A two-stage regenerator 3a that is laminated from the side toward the low temperature end side, and two types of granular regenerator materials, Pb grains 14 and HoCu ₂ grains 15, are laminated in this order from the high temperature end side to the low temperature end side. When the refrigerating capacity of the two-stage regenerator 3a is compared, the refrigerating capacity of the latter two-stage regenerator 3a is superior in a wide temperature range.
On the other hand, despite the fact that HoCu ₂ (HoCu ₂ grains 15) is a very expensive regenerator, the two-stage regenerator 3a (the latter) using two types of granular regenerators of Pb grains 14 and HoCu ₂ grains 15 is used. In general).
Therefore, improvement of the refrigerating capacity of the two-stage regenerator 3a using three kinds of Pb grains 14, HoCu ₂ grains 15, and GOS grains 16 has been desired due to such circumstances.
On the other hand, as a result of earnest research, the inventors of the granular regenerator material aggregate 101 accommodated in the first cylinder 9 of the regenerator used in the cooling mechanism represented by the refrigerator 1 shown in FIG. By changing the arrangement, we succeeded in improving the refrigerating capacity of the regenerator while using the same Pb grains 14, HoCu ₂ grains 15, and GOS grains 16 as before.

FIG. 3 is a graph comparing the refrigerating capacity at each temperature in the regenerator according to Example 1 of the present invention and the regenerator according to the comparative example. 4 (a) and 4 (b) both show the types of granular regenerator materials in the regenerator according to the comparative example used in the refrigerating capacity test of the regenerator according to Example 1 of the present invention and the first cylinder. It is a conceptual diagram which shows arrangement | positioning in. In addition, the same code | symbol is attached | subjected about the part same as what was described in FIG. 1, and the description about the structure is abbreviate | omitted.
First, the arrangement of the granular regenerator material in the regenerator according to Example 1 used for the refrigeration capacity test of this time will be described with reference to FIGS. 1 (b), 1 (c) and FIG. 4.
The arrangement of the granular regenerator materials accommodated in the regenerator 100A according to the first embodiment of the present invention is as shown in FIGS. 1 (b) and 1 (c).
FIG. 4A shows the arrangement of the granular regenerator materials in the granular regenerator material aggregate 101 housed in the regenerator according to the first comparative example. In the regenerator according to the comparative example 1, the Pb particles 14 are filled from the high temperature end side of the first cylindrical body 9 (the side indicated by the symbol P in FIG. 4A) to the middle of the first cylindrical body 9. The HoCu ₂ grains 15 are filled from the Pb grains 14 to the low temperature end side of the first cylinder 9 (the side indicated by the symbol Q in FIG. 4A), and the axial direction of the first cylinder 9 A granular cold storage material aggregate 101 composed of two layers is formed from the high temperature end to the low temperature end of the cross section.
On the other hand, FIG. 4B shows the arrangement of the granular regenerator materials in the granular regenerator material aggregate 101 accommodated in the regenerator according to the second comparative example. In the regenerator according to the comparative example 2, the Pb particles 14 are filled from the high temperature end side (the side indicated by the symbol P in FIG. 4B) of the first cylinder 9 to the middle of the first cylinder 9. From the top of this Pb grain 14 toward the low temperature end side of the first cylindrical body 9 (the side indicated by the symbol Q in FIG. 4A), from the lower end of the first cylindrical body 9 to a height of 3/4 The HoCu ₂ grains 15 are filled, and further, the GOS grains 16 are filled from the top of the HoCu ₂ grains 15 to the low temperature end of the first cylindrical body 9 (the side indicated by the symbol Q in FIG. 4A). A granular regenerator material aggregate 101 composed of three layers from the high temperature end to the low temperature end in the axial cross section of the cylindrical body 9 is formed.

When comparing the regenerator 100A according to Example 1 of the present invention as described above and the refrigerating capacity according to Comparative Examples 1 and 2, the refrigerating capacity of the regenerator according to Comparative Example 1 is the highest as shown in FIG. Then, the refrigerating capacity was high in the order of the regenerator 100A according to Example 1 of the present invention and the cooler according to Comparative Example 2.
For this reason, the arrangement of the HoCu ₂ grains 15 and the GOS grains 16 in the first cylindrical body 9 is changed in a regenerator in which Pb grains 14, HoCu ₂ grains 15, and GOS grains 16, which are conventionally known cold storage materials, are combined. By doing so, it was confirmed that the refrigerating capacity of the regenerator can be improved.
Therefore, according to the regenerator 100A according to the first embodiment, it is possible to provide a regenerator having a higher refrigeration capacity using the same regenerator material as in the past. Moreover, it has the effect that the regenerator which has the cooling capability close | similar to the comparative example 1 can be provided more cheaply.

In the regenerator 100A according to the first embodiment, as a means for accommodating the GOS grain 16 in the HoCu ₂ grain 15 in a separated state, for example, the second cylinder 10 is provided separately from the first cylinder 9. The structure of the regenerator 100 </ _b > A according to the first embodiment is simplified by using a means of providing and encapsulating the GOS grains 16 contained in the second cylinder 10 in the HoCu ₂ grains 15. can do.
In the specification of the present application, the second cylindrical body 10 is described by taking as an example a case where the hollow section has a circular cross-sectional shape. However, the cross-sectional shape of the second cylindrical body 10 is a triangle or more. The polygon may be an oval or other irregular ring. That is, the cross-sectional outer shape of the hollow portion is not particularly problematic as long as it is a cylindrical body that can be filled with a granular cold storage material.
In this case, the axial directions of the first cylinder 9 and the second cylinder 10 are the same (substantially coincident) in order to ensure the fluidity of the high-pressure gas (heat exchange gas) in the first cylinder 9. It is desirable to include this concept.
In the regenerator 100A according to the first embodiment, stainless steel is used as the material of the first cylinder 9 and the second cylinder 10 in consideration of durability and strength. As long as the cylindrical body is made of a metal, alloy, or synthetic resin having a lower thermal conductivity than stainless steel, sufficient strength and durability, and good workability, it can be used without any problem for the regenerator 100A according to the first embodiment. be able to. The first cylinder 9 and the second cylinder 10 are preferably made of a material having the same thermal conductivity as that of stainless steel or having a lower thermal conductivity than stainless steel. This is because a large amount of heat is transferred to the end due to heat conduction, resulting in heat loss on the low temperature side. Therefore, in order to suppress this heat loss as much as possible, it can be said that a material having a small thermal conductivity and a thin wall thickness is desirable. For example, bakelite corresponds to other than stainless steel in the present embodiment.

Here, the effect of the regenerator according to the first embodiment of the present invention will be described with reference to detailed test results regarding the refrigerating capacity of the regenerator according to the first embodiment of the present invention.
FIG. 5 is a graph comparing the refrigerating capacity at each temperature in the regenerator according to Example 1 of the present invention and the regenerator according to the comparative example. FIG. 6 is a diagram showing the arrangement and the proportion of each granular regenerator material accommodated in the regenerator used in the refrigerating capacity test of the regenerator according to Example 1 of the present invention. The origin O side in the Y-axis direction in FIG. 6 is the high temperature end side of the first cylinder 9.
The three types of regenerators according to Example 1 used in this test and the regenerators according to Comparative Examples 3 to 7 will be described. In this test, as the first cylinder 9 of the three types of regenerators according to Example 1 and the regenerators according to Comparative Examples 3 to 7, stainless steel having a hollow portion with a diameter of 15 mm in the vertical cross section in the axial direction. The cylinder made from was used.
In addition, as the second cylinder 10 in the three types of regenerators according to Example 1, a stainless steel cylinder having a hollow portion with a diameter of 9 mm and a wall thickness of 0.5 mm was used.
Further, 50% by volume of the granular regenerator material accommodated in all the regenerators used in this test is Pb particles 14, and the Pb particles 14 are used as the first cylinder in all regenerators used in this test. 9 was arranged on the high temperature end side.
Therefore, only the differences between the three types of regenerators according to Example 1 and the regenerators according to Comparative Examples 3 to 7 used in this test are described here. Moreover, in the description regarding the regenerator to be used in the following test, the average particle diameter of the granular regenerator material that is not described regarding the average particle diameter is 0.2 mm.

In the regenerator according to Example 1A, HoCu ₂ grains 15 are stacked on the Pb grains 14, and the average particle diameter is 0.25 mm in the second cylinder 10 inserted into the HoCu ₂ grains 15. GOS grains 16 were accommodated.
In the regenerator according to Example 1B, HoCu ₂ grains 15 are stacked on the Pb grains 14, and the average particle diameter is 0.1 mm in the second cylinder 10 inserted into the HoCu ₂ grains 15. GOS grains 16 were accommodated.
The regenerator according to Example 1C is obtained by replacing the arrangement of the HoCu ₂ grains 15 and the GOS grains 16 according to Example 1A.
In the regenerator according to Comparative Example 3, 40% by volume HoCu ₂ grains 15 were laminated on the Pb grains 14, and 10% by volume GOS grains 16 having an average particle diameter of 0.25 mm were laminated thereon.
In the regenerator according to Comparative Example 4, 40 volume% HoCu ₂ grains 15 were laminated on the Pb grains 14, and 10 volume% GOS grains 16 having an average particle diameter of 0.1 mm were laminated thereon.
In the regenerator according to Comparative Example 5, 50 vol% HoCu ₂ grains 15 were laminated on the Pb grains 14.
In the regenerator according to Comparative Example 6, 30% by volume HoCu ₂ grains 15 were laminated on the Pb grains 14, and 20% by volume GOS grains 16 having an average particle diameter of 0.25 mm were laminated thereon.
In the regenerator according to Comparative Example 7, 30 volume% HoCu ₂ grains 15 were laminated on the Pb grains 14, and 20 volume% GOS grains 16 having an average particle diameter of 0.1 mm were laminated thereon.

FIG. 5 is a graph comparing the refrigeration capacities of 10 types of regenerators for the test as described above (the regenerators 1A to 1C according to the three types of Example 1 and the regenerators according to Comparative Examples 3 to 7). is there.
As shown in FIG. 5, the regenerator according to Comparative Example 3 in which 10% by volume of GOS particles 16 having an average particle size of 0.25 mm and 10% by volume of GOS particles 16 having an average particle size of 0.1 mm were stored. With the regenerator according to Comparative Example 4, the cooling capacity of the regenerator according to Comparative Example 4 in which the average particle size of the GOS grains 16 is small was high.
On the other hand, the regenerator according to Comparative Example 6 in which 20% by volume of GOS particles 16 having an average particle size of 0.25 mm was accommodated, and Comparative Example 7 in which 20% by volume of GOS particles 16 having an average particle size of 0.1 mm were accommodated. In the regenerator according to the present invention, the cooling capacity of the regenerator according to Comparative Example 6 in which the average particle size of the GOS grains 16 is large was high.
Therefore, from the above results, in the regenerator according to the conventional example in which a plurality of types of granular regenerator materials are simply stacked in the axial direction in the first cylindrical body 9, when a specific granular regenerator material is accommodated more than a certain amount. It has been clarified that when the average particle size of the granular regenerator material is reduced in order to improve the regenerator efficiency in a specific temperature range by the granular regenerator material, the cool regenerator efficiency is reduced. This is because, in the regenerator according to the conventional example, when the average particle size of the specific granular regenerator material is reduced, the granular regenerator material having a small average particle size in all the regions of the vertical cross section in the axial direction of the first cylindrical body 9. As a result, the fluidity of the high-pressure gas (heat exchange gas) in the first cylindrical body 9 is considered to decrease. In this case, if the relative volume of the granular regenerator material having a small average particle diameter is small, the fluidity of the high-pressure gas in the first cylindrical body 9 is not significantly hindered, but the granular regenerator having a small average particle diameter is not disturbed. As the relative volume of the material increases, it is considered that the decrease in the fluidity of the high-pressure gas in the first cylinder 9 becomes significant.

On the other hand, the regenerator according to Example 1A in which the GOS grains 16 having an average particle diameter of 0.25 mm are accommodated in the second cylinder 10, and the GOS having an average particle diameter of 0.1 mm in the second cylinder 10. In Example 1B which accommodated the grain 16, almost no difference was recognized in the cold storage capacity.
From this result, as in the regenerator 100A according to Example 1, for example, when two types of granular regenerator materials are separated and accommodated in the axial direction of the first cylindrical body 9, the average of either one of the granular regenerator materials Even when the particle size is reduced and densely packed, a decrease in fluidity of the high-pressure gas in the first cylinder 9 can be suppressed.
Therefore, it can suppress that the demerit of the fall of the cool storage efficiency produced by making the average particle diameter of a granular cool storage material small is produced.

Furthermore, the regenerator according to Example 1A and the regenerator according to Example 1C are different only in that the arrangement of the HoCu ₂ grains 15 and the GOS grains 16 in the first cylinder 9 is replaced. _The regenerator according to Example 1A in which the _two grains 15 were arranged outside the second cylinder 10 had a higher refrigeration capacity.
From this result, even when the same kind of granular regenerator material was used, it became clear that the refrigerating capacity of the regenerator differs depending on the arrangement of the granular regenerator material in the first cylindrical body 9.
This means that even in a regenerator made up of a combination of existing granular regenerators, the regenerator efficiency can be improved simply by changing the arrangement of the granular regenerators. It suggests that there is a possibility of improvement.

Finally, when comparing the refrigerating capacity of the regenerator according to Comparative Example 5 and the regenerator according to Examples 1A and 1B, the GOS grain 16 is contained in the HoCu ₂ grains 15 using the second cylindrical body 10. In both cases, whether the average particle size of the GOS grains 16 was 0.25 mm or 0.1 mm, the refrigerating capacity of the regenerator according to Comparative Example 5 could be brought close to the refrigeration capacity.
Therefore, according to the regenerator 100A according to Example 1, it was confirmed that a regenerator having a higher refrigerating capacity can be provided only by changing the arrangement while using a conventional granular regenerator material.
Therefore, according to the regenerator 100A according to the first embodiment, it is possible to increase the degree of freedom of arrangement of a plurality of types of granular regenerator materials in the first cylindrical body 9, and thus, a regenerator having a higher refrigerating capacity can be obtained. It was shown that there is a possibility that it can be provided.
In this case, even if the average particle size of the specific granular regenerator material is reduced, the refrigerating capacity of the regenerator does not decrease, so that the average particle size of the regenerator material can be easily changed. Thereby, when configuring a regenerator using a plurality of types of granular regenerators, not only the degree of freedom of the arrangement of the granular regenerators in the first cylinder 9 but also the setting of the average particle size of the granular regenerators It was shown that the degree of freedom can be increased.

Here, another example of the arrangement of the GOS grains 16 in the HoCu ₂ grains 15 of the regenerator 100A according to the first embodiment will be described with reference to FIG.
7A to 7E are perspective views showing other examples of the arrangement of the HoCu ₂ grains and the GOS grains inside the regenerator according to the first embodiment of the present invention. The same parts as those described in FIGS. 1 to 6 are denoted by the same reference numerals, and description of the configuration is omitted. Further, FIG. 7 shows only the housing portion of the HoCu ₂ grains 15 in which the GOS grains 16 in FIG. 1B are accommodated.
In the previous FIG. 1, as an example of the regenerator 100A according to the first embodiment, the HoCu ₂ grain 15 accommodation region disposed on the low temperature end side (the side indicated by the symbol Q in FIG. 1) in the first cylindrical body 9. on the axis, and has been described by taking the case where GOS grains 16 are arranged on the entire area of the shaft as an example, as shown in FIG. 7 (a), the low temperature end in the accommodating region of HoCu ₂ grain 15 The GOS grains 16 may be accommodated only on the side (indicated by the symbol Q in FIG. 7). Alternatively, although not particularly illustrated, the GOS grains 16 may be accommodated only on the high temperature end side (the side indicated by the symbol P in FIG. 7) in the accommodation area of the HoCu ₂ grains 15. Further, as shown in FIG. 7B, the GOS grains 16 may be accommodated in the central portion in the axial direction in the accommodation area of the HoCu ₂ grains 15.
Further, FIGS. 1 and FIG. 7 (a), the (b), the has been described as an example a case in which only one accommodating a rod-like mass composed of GOS grains 16 in HoCu ₂ grain 15, HoCu ₂ tablets 15 There may be two or more rod-shaped lumps of GOS grains 16 accommodated therein.
More specifically, as shown in FIG. 7 (c), three rod-like lumps made of GOS grains 16 may be accommodated in the HoCu ₂ grains 15 in parallel with the axial direction of the first cylindrical body 9. . Further, in this case, as shown in FIGS. 7D and 7E, the rod-like lump made of the GOS grains 16 is arranged not only in the whole area in the axial direction of the area in which the HoCu ₂ grains 15 are accommodated but only in a part. May be. More specifically, it may be a plurality of accommodating a rod-like mass composed of GOS particle 16 only to the hot end or the cold end of the region HoCu ₂ grain 15 is accommodated, HoCu ₂ grain 15 is accommodated A plurality of rod-shaped chunks made of GOS grains 16 may be accommodated in the middle of the region.

A regenerator according to a second embodiment of the present invention will be described with reference to FIGS.
In the regenerator 100A according to the first embodiment, when a plurality of types of granular regenerator materials are accommodated in the first cylindrical body 9, the refrigerating capacity of the regenerator 100A is improved only by changing the arrangement of the granular regenerator materials. succeeded in.
The technical content according to the present invention is not only applicable to a regenerator composed of Pb grains 14, HoCu ₂ grains 15, and GOS grains 16 as a granular regenerator material. This technology can be applied to all types of regenerators.
In the second embodiment, an example of a configuration of a new regenerator using the technical idea of the present invention will be described.
Fig.8 (a) is a conceptual diagram which shows the external shape of the granular cool storage material aggregate | assembly in the inside of the regenerator which concerns on Example 2 of this invention, (b)-(d) are all in Example 2 of this invention. It is sectional drawing which shows the example of arrangement | positioning of the granular cool storage material in the inside of this cool storage. 9A to 9C are cross-sectional views showing examples of arrangement of the granular regenerator material inside the regenerator according to the second embodiment of the present invention. The same parts as those described in FIGS. 1 to 7 are denoted by the same reference numerals, and description of the configuration is omitted.
Moreover, in Example 2, since it is not necessary to specify the material which comprises a granular cool storage material, the 1st granular cool storage material 20, the 2nd granular cool storage material 21, and the 3rd granular cool storage material are assumed as arbitrary granular cool storage materials. Although the case where a regenerator is configured using 22 will be described as an example, in the regenerator according to the second embodiment, three or more types of granular regenerator materials accommodated in the first cylinder 9 may be used. .

As shown to Fig.8 (a), the granular cool storage material aggregate | assembly 19 which consists of a multiple types of granular cool storage material accommodated in the 1st cylinder 9 of the cool storage apparatus which concerns on Example 2 is cylindrical. Note that the hollow portion of the first cylindrical body 9 is not necessarily a cylinder, but at any position of the granular regenerator material assembly 19 so that the flow of the high-pressure gas in the first cylindrical body 9 is not hindered. The area of the vertical cross section in the axial direction is preferably constant.
In the regenerator according to the second embodiment, for example, as shown in FIG. 8B, three types are formed so as to form concentric layers in the direction from the center toward the outer edge in the vertical cross section in the axial direction of the first cylindrical body 9. The granular regenerator material (the first granular regenerator material 20, the second granular regenerator material 21, and the third granular regenerator material 22) may be disposed. As a concrete accommodation method of the second granular regenerator material 21 and the third granular regenerator material 22 in this case, for example, two second cylinders 10 having different direct lines in the first cylinder 9 are provided. What is necessary is just to make it accommodate, making an axial direction correspond and to fill a hollow part of each cylinder, or the clearance gap between cylinders with a granular cold storage material.
Further, in the regenerator according to the second embodiment, as shown in FIGS. 8C and 8D, the third is arranged in the center in the axial cross section of the granular regenerator material assembly 19 shown in FIG. The granular regenerator material 22 may be disposed only on the low temperature end side (or the low temperature end side) of the first cylindrical body 9, or may be disposed only on the central portion in the axial direction of the first cylindrical body 9. Good.
In FIG. 8, the case where the 3rd granular cold storage material 22 is arrange | positioned at the low temperature end side of the 1st cylinder 9 is shown in the figure.

In the regenerator according to the second embodiment, for example, as shown in FIG. 9A, the region where the three layers are formed concentrically in the axial vertical cross section of the first cylinder 9 is defined as the first cylinder. 9 may be formed only on a part in the axial direction of 9, for example, only on the low temperature end side (or high temperature end side) of the first cylindrical body 9. FIG. 9 illustrates a case where the region where the three layers are formed concentrically in the axial vertical cross section of the first cylinder 9 is disposed on the low temperature end side of the first cylinder 9.
In this case, for example, as shown in FIGS. 9B and 9C, a rod-shaped lump made of the third granular regenerator material 22 is part of the axial direction of the region where the second granular regenerator material 21 is arranged. (For example, only in the center in the axial direction, or only on the low temperature end side (or high temperature end side) in the axial direction. In FIG. 9, the second granular regenerator 21 in the second granular regenerator 21. The case where the rod-shaped lump which consists of three granular cold storage materials 22 is arrange | positioned only at the low temperature end side of the 1st cylinder 9 (refer FIG.9 (c)) is illustrated.

In the regenerator according to the second embodiment, for example, as shown in FIG. 10A, the region where the three layers are formed concentrically in the axially vertical cross section of the first cylinder 9 is defined as the first cylinder. You may form only in the center of 9 axial directions.
In this case, for example, as shown in FIGS. 10B and 10C, a rod-shaped lump made of the third granular regenerator material 22 is part of the axial direction of the region where the second granular regenerator material 21 is arranged. (For example, only on the high temperature end side (or low temperature end side) in the axial direction, or only in the center in the axial direction. In FIG. The case where the rod-shaped lump which consists of three granular cool storage materials 22 is arrange | positioned only at the high temperature end side of the 1st cylinder 9 (refer FIG.10 (b)) is illustrated.

Further, in the regenerator according to the second embodiment, for example, as shown in FIGS. 11A and 11B, a region in which three layers are formed concentrically in the axial vertical cross section of the first cylindrical body 9 , A region where two layers are formed concentrically may be provided in series in the axial direction of the first cylindrical body 9.
In this case, the region in which the three layers are formed may be disposed on the low temperature end side (or only on the high temperature end side) of the first cylindrical body 9 or in the axial center of the first cylindrical body 9. 11 shows a case where the region where the three layers are formed is arranged on the low temperature end side of the first cylindrical body 9 in the axial direction.

As an example of the arrangement of the granular regenerator material in the regenerator according to the second embodiment, in FIGS. 8 to 11, one rod-shaped lump made of the third granular regenerator material 22 is provided inside the second granular regenerator material 21. However, two or more rod-shaped chunks made of the third granular regenerator material 22 may be accommodated in the second granular regenerator material 21.
Although not particularly shown, as another example of the arrangement of the granular regenerator material in the regenerator according to the second embodiment, the first granular regenerator material 20 and the second regenerator material 20 in the granular regenerator material assembly 19 shown in FIGS. Each of the granular regenerator material 21 and the third granular regenerator material 22 may be constituted by an aggregate of granular regenerator materials formed by laminating a plurality of types of granular regenerator materials in the axial direction of the first cylindrical body 9. .
Furthermore, in the regenerator according to the second embodiment, when there are at least two types of granular regenerators arranged in the axially vertical cross section of the first cylindrical body 9, the average grain of at least one of the granular regenerators The diameter may be reduced. In this case, since all the vertical cross sections in the axial direction of the first cylinder 9 are not filled with the granular regenerator material having a small average particle diameter, the fluidity of the high-pressure gas in the first cylinder 9 is greatly increased. The risk of lowering can be reduced. Thereby, the packing density of the specific granular cool storage material accommodated in the 1st cylinder 9 can be raised, and the cool storage efficiency by the granular cool storage material can be improved.

Therefore, in the technical content according to the present invention of disposing a plurality of types of granular regenerator materials in a state where they are separated from each other in the axial vertical cross section of the first cylindrical body 9, By combining the conventional technical contents of storing granular regenerator materials in a stacked state, it is possible to realize an arrangement of a novel granular regenerator material that has never existed before.
As a result, there is a possibility that the refrigerating capacity of the regenerator can be greatly improved by changing the arrangement in the first cylindrical body 9 while using a conventionally known granular regenerator material as it is.
In addition, in the conventional regenerator formed by laminating a plurality of granular regenerator materials on the axial cross section of the cylindrical body 9, a plurality of types of granular materials as shown in Example 2 are included in the granular regenerator material constituting at least one layer. You may arrange | position the arrangement structure which consists of a cool storage material.

  As described above, the present invention accommodates at least two types of granular regenerator materials in a state where the regenerator is separated in the axial vertical cross section, thereby combining at least two types of granular regenerator materials in the regenerator. The GM (Gifford McMahon) refrigerator, pulse tube refrigerator, Stirling cycle relates to a regenerator that can greatly increase the degree of freedom of arrangement of the granular regenerator material in the axial cross section of the regenerator when housed. A cryogenic regenerator and refrigerator suitable for use in a refrigerator, a Burmese cycle refrigerator, a Solvay cycle refrigerator, an Ericsson cycle refrigerator, or a refrigeration system using the same in a precooling stage, and the It can be used in the fields of the superconducting electromagnet device, the MRI device, the cryopump and the like used.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator 2 ... 1-stage cylinder 2a ... 1-stage regenerator 2b ... 1-stage regenerator material 2c ... 1-stage cooling stage 2d ... Gas passage 2e ... 1-stage expansion space 3 ... 2-stage cylinder 3a ... 2-stage regenerator 3b ... Two-stage regenerator material 3c ... Two-stage cooling stage 3d ... Gas passage 3e ... Two-stage expansion space 4 ... Drive motor 5 ... Seal 6 ... Compressor 7a, 7b ... High-pressure gas piping 8a, 8b ... Lid 9 ... First cylinder DESCRIPTION OF SYMBOLS 10 ... 2nd cylinder 11 ... 1st mesh body 12 ... 2nd mesh body 13 ... Felt 14 ... Pb grain (granular cold storage material) 15 ... HoCu ₂ grain (granular cold storage material) 16 ... GOS grain (granular cold storage) 17) Central axis 19 ... Granular regenerator material assembly 20 ... First granular regenerator material 21 ... Second granular regenerator material 22 ... Third granular regenerator material 23a, 23b ... High pressure gas valve 100A ... Regenerator 101 ... Granular material Cold storage body assembly 102 ... Ventilation Sotai 103 ... vent isolation layer P ... upper (hot end) Q ... bottom (cold end) R ... bottom

Claims (6)

A regenerator that houses at least two types of granular regenerator materials separated from each other in a cylinder,
At least a part of the region in the axial direction of the regenerator is disposed in a state where at least two kinds of granular regenerator materials are separated from each other in a vertical cross section in the axial direction of the regenerator. A regenerator that houses at least two types of granular regenerator materials separated from each other in a cylinder,
The cross section in the axial direction of the regenerator has a region where at least two kinds of the granular regenerator material are arranged in parallel in the axial direction of the regenerator. A regenerator that houses at least two types of granular regenerator materials separated from each other in a cylinder,
The cylinder includes at least one second cylinder inserted into the cylinder,
The regenerator characterized in that the granular regenerator material housed inside the second cylinder and the granular regenerator material arranged outside the second cylinder are different types of granular regenerator material. Pb which is the first granular regenerator material is accommodated on the high temperature end side of the cylindrical body, and HoCu ₂ which is the second granular regenerator material is accommodated on the low temperature end side of the cylindrical body, and the second granular regenerator material The regenerator according to claim 1 or _{2, wherein} Gd ₂ O ₂ S which is a third granular regenerator material is accommodated therein. Pb which is the first granular regenerator material is accommodated on the high temperature end side of the cylindrical body, and HoCu ₂ which is the second granular regenerator material is accommodated on the low temperature end side of the cylindrical body, and the second granular regenerator material during, and interpolated at least one of said second cylindrical body, according to claim 3, characterized in that a third particulate cold accumulating material Gd 2 _O 2 _S is accommodated in the second tubular body The regenerator described.   The average particle diameter of at least two types of granular cold storage materials differs in the axial direction vertical cross section in which the said at least two types of granular cold storage materials are arrange | positioned, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Regenerator.