JP2004278877A - Cold storage unit for refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold storage unit for a refrigerating machine capable of being easily assembled/disassembled, and easily changing the quantity of a cold storage material and the flow of a gas. <P>SOLUTION: This cold storage unit for the refrigerating machine is provided with a core 30 in a displacer (cold storage unit) 10, and the quantity of the cold storage material 18 and the flow of gas can be adjusted by changing the shape of the core 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a regenerator for a refrigerator in which a regenerator material is filled and a low-temperature gas passes through the regenerator material so that the regenerator material can store cool air. A regenerator for a refrigerator suitable for use in a McMahon cycle refrigerator (referred to as a 4K-GM refrigerator), easy to assemble and disassemble, and capable of easily changing the amount of cold storage material and gas flow, and The present invention relates to a refrigerator including the regenerator.
[0002]
[Prior art]
GM refrigerators, Stirling cycle refrigerators, pulse tube refrigerators, and the like are known as regenerator cryogenic refrigerators that obtain a low temperature using a regenerator containing a regenerator material using a gas refrigerant such as helium. ing. Here, the regenerator is generically defined as a reciprocating displacer with a built-in regenerative material used in a GM refrigerator or the like and a fixed regenerator used in a pulse tube refrigerator.
[0003]
For example, in a GM refrigerator, as described in Patent Literature 1, Patent Literature 2, and Patent Literature 3, as shown in FIG. 1, a displacer (piston) 10 having a built-in regenerative material 18 and this displacer 10 are charged. The compressed working fluid (refrigerant gas) is supplied to the expander having the cylinder 20 and the working fluid (refrigerant gas) is adiabatically expanded in the expander to obtain cold. In the figure, reference numeral 22 denotes a gas flow path, and reference numeral 24 denotes an expansion space in the cylinder 20.
[0004]
The structure of a typical displacer 10 is shown in FIG. As shown in the figure, a cool storage material 18 is filled in the displacer 10, and a low-temperature gas passes through the cooler, so that the cool storage material 18 can store cool air. In the drawing, reference numeral 12 denotes a displacer cylinder, and reference numerals 14 and 16 denote a displacer upper lid and a lower lid which are attached to the top and bottom of the displacer cylinder 12, respectively.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 7-324831 [Patent Document 2]
JP 2000-146335 A [Patent Document 3]
JP 2000-292022 A
[Problems to be solved by the invention]
However, in such a displacer, when the amount of the cold storage material 18 is to be changed due to various conditions such as a change in refrigeration capacity and cost reduction, it is necessary to newly make a tube suitable for the amount of the cold storage material. .
[0007]
Alternatively, as shown in FIG. 3, a method of bonding the cylindrical sleeve 26 to the inner wall of the displacer cylinder 12 may be adopted. However, due to poor adhesion, gas blow-through occurs between the sleeve 26 and the displacer cylinder 12, May adversely affect performance. In addition, once bonded, it is difficult to restore it, so that it is very inconvenient when searching for the optimal amount of cold storage material.
[0008]
An object of the present invention is to provide a regenerator for a refrigerator that is easy to assemble and disassemble, and that can easily change the amount of a regenerator material and the flow of a gas, in order to solve the conventional problems. And
[0009]
[Means for Solving the Problems]
The present invention relates to a regenerator for a refrigerator in which a regenerator material is filled and a low-temperature gas passes through the regenerator material so that the regenerator material can store cool air, wherein a core is disposed in the regenerator. By changing the shape of the core, the amount of the cold storage material and the flow of the gas can be adjusted, thereby solving the above problems.
[0010]
Further, the shape of the core is any one of a columnar shape, a roll shape, a conical shape, a barrel shape, a wound shape, and a spiral shape.
[0011]
Further, the core is made of a material having a low thermal conductivity such as FRP, stainless steel, bakelite or the like to prevent heat penetration.
[0012]
In addition, the core can be fixed to a lid of the regenerator so that the core does not move during charging of the regenerator material or during operation.
[0013]
The present invention also provides a refrigerator comprising the above regenerator.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
In the first embodiment of the present invention, the present invention is applied to a displacer of a 4K-GM refrigerator. As shown in FIG. 4, a core 30 is installed in a displacer 10 similar to a conventional example, and By changing the shape of the child 30, the amount of the cold storage material 18 and the flow of gas can be adjusted.
[0016]
It is preferable to use a powder or a granular material as the cold storage material 18.
[0017]
The core 30 is preferably made of a material having a low thermal conductivity, such as FRP, stainless steel, and bakelite, in order to prevent heat penetration. The core 30 can be fixed by digging a groove in the upper lid 14 and the lower lid 16 of the displacer, placing the core 30 therein, and sandwiching the core 30 between the upper lid 14 and the lower lid 16. By fixing the core in this way, the core can be fixed so as not to move during charging of the cold storage material or during operation.
[0018]
The shape of the core 30 is not limited to the columnar shape shown in FIG. 4, but is a roll shape as shown in FIG. 5A, a conical shape as shown in FIG. By making various shapes such as a spiral shape as shown, a barrel shape as shown in FIG. 5D, and a wound shape as shown in FIG. 5E, not only the amount of the cold storage material 18 but also the displacer 10 can be obtained. The flow of gas inside can be controlled.
[0019]
With this displacer, it is possible to provide a refrigerator having various refrigeration capacities without changing the outer diameter of the displacer cylinder 12.
[0020]
Note that the method of fixing the core is not limited to the first embodiment shown in FIG. 4, and screws 30A are cut at both ends or one end of the core 30 as in the second embodiment shown in FIG. A screw hole is also formed in the displacer lids 14 and 16 to fix them. Alternatively, as shown in FIG. 7, holes 13B and 16B for bolts are formed in the centers of the displacer lids 14 and 16 and the core 30. It is also possible to open 30B and fix it with bolts 40 and nuts 42 passed therethrough.
[0021]
In the present embodiment, a 4K-GM refrigerator is taken as an example, but the application of the present invention is not limited to this. For example, the present invention is applicable to other regenerator refrigerators such as a Stirling cycle refrigerator and a pulse tube refrigerator. Can be similarly used.
[0022]
【The invention's effect】
According to the present invention, the regenerator can be easily assembled and disassembled, and the amount of the regenerator material and the flow of gas can be easily changed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a regenerator of a conventional cryogenic refrigerator. FIG. 2 is a cross-sectional view showing a configuration of a typical displacer. FIG. 3 is a cross-sectional view showing a configuration of a modification of the displacer. FIG. 5 is a sectional view showing a configuration of the first embodiment of the present invention. FIG. 5 is a front view showing a modification of the shape of the core. FIG. 6 is a sectional view showing a configuration of the second embodiment of the present invention. Sectional view showing the configuration of the third embodiment.
10 ... Displacer (cool storage device)
12 displacer cylinder 14 displacer upper lid 16 displacer lower lid 18 cold storage material 30 core 40 bolt 42 nut

Claims (5)

In a regenerator for a refrigerator in which a regenerator material is filled and a low-temperature gas passes through the regenerator material, the regenerator material stores cold air.
Arranging a core in the regenerator,
A regenerator for a refrigerator, wherein the amount of regenerator material and the flow of gas can be adjusted by changing the shape of the core. The regenerator for a refrigerator according to claim 1, wherein the shape of the core is any one of a columnar shape, a roll shape, a conical shape, a barrel shape, a wound shape, and a spiral shape. The regenerator for a refrigerator according to claim 1 or 2, wherein the core is formed of a material having a low thermal conductivity. The regenerator for a refrigerator according to any one of claims 1 to 3, wherein the core can be fixed to a lid of the regenerator. A refrigerator comprising the regenerator according to any one of claims 1 to 4.

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