JPS6073267A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a refrigerator using a regenerator, such as a Stirling cycle refrigerator or a Gifford McMahon Yakle refrigerator, and particularly relates to a refrigerator that uses a regenerator to reduce the minimum temperature reached. Regarding the refrigerator that was designed. .

/ [Technical background of the invention and its problems] In recent years, the development of various electrical devices and energy generator tubes that utilize superconducting phenomena has become active.

Along with this, the need for cryogenic generation devices such as He liquefaction products is also increasing.

Conventionally known cryogenic generating devices include freezing methods using Stirling 1-cycle refrigeration, Gifford McMahon refrigeration rifles, and the like. These refrigerators are
A refrigerant such as helium is completely passed through the refrigerant material to cool the refrigerant, and in order to lower the temperature reached by the refrigerant, a refrigerant material with a large cold storage effect is essential. Conventionally, lead has been used as a cold storage material for refrigeration, but the specific heat of lead rapidly decreases compared to that of helium gas at temperatures below 10 degrees, making it difficult to use as a cold storage material. There was a problem that the function could no longer be fulfilled.For this reason, such a cold W/W machine was limited to cooling down to about 20 degrees, and there was a problem that the range for W/W was limited.

[Purpose of the invention]

The present invention was created in view of these problems, and its purpose is to provide a refrigerator that uses a regenerator that can maintain a high specific heat even at temperatures close to absolute zero to lower the minimum temperature reached by the refrigerant. Our goal is to provide the following.

[Summary of the invention]

The present invention relates to a cold storage material made of rare earth magnetic material.

It is characterized by comprising a means for applying a predetermined magnetic field to this cold storage material.

Rare earth magnetic materials that can be used as cold storage materials include gadolinium gallium garnet (Gd, Ga, O, ), f'isglosium 7lumigannent (D)'5AdeO+t) *dysprosium gallium garnet (DysG a50)
□), Gadolinium Aluminum Garnent (Gd5A (5,
0,,), deineprosium phosphate (Dy PO2)
s branch gadolinium (Gds (804)a・8I4,
0), europium sulfide (guS).

〔Effect of the invention〕

According to the present invention, the cold storage material made of rare earth magnetic material is used within a predetermined magnetic field. Therefore, even at a cold storage temperature of 5° or less, the high specific heat of the cold storage material can be maintained. By the way, as an example, when gadolinium gallium garnet is placed in a 3T magnetic field, the specific heat at each temperature is shown by a in FIG. 1. Note that lead is used for comparison, and fluidized europium and f-dolinium rhosoum (GdRh) in the case where no magnetic field is applied are shown as C and d, respectively. That's sweet, e in the figure is the specific heat of helium at 2Q aim.

As is clear from the same figure, lead, fluidized europium C
The specific heat of gadolinium rhodium d and gadolinium rhodium d drops sharply below 15°, whereas the specific heat of gadolinium rhodium a placed in a 3T magnetic field is high even below 5°. is maintained.

As described above, according to one aspect of the present invention, a high heat storage effect of the cold storage material can be obtained, and the lowest temperature reached by the refrigerator can be significantly lowered.

[Embodiments of the invention]

Hereinafter, the details of "Unexploded tsu" will be explained based on the illustrated embodiment.

Fig. 1 shows a Stirling refrigerated refrigeration system (tji), and numeral 1 in the figure is a displacer.

This displacer 1 has two seedling volumes 4 and 5 formed by a cylinder 2 and a piston 3 that reciprocates within this cylinder 2, and a flow path that communicates these spaces 4 and 5 with , a cooler 6, a regenerator 7, and a cold extraction heat exchanger 8 are connected in series. The pressure between the seedling amount 4 and the cooler 6 is j, il! The flow path from i-machine 9 is connected.

The regenerator 7 consists of a regenerator 8 made of, for example, gadolinium gallium garnet, and an excitation device 11 that applies a magnetic field of T to the regenerator 10. Cool storage is carried out up to the vicinity. Helium is used as a refrigerant.

The operation of the Stirling rifle refrigerator configured in this way will be explained.

In one cycle of Stirling refrigeration, cooling usually takes place through four steps. In the first process, the piston 3 of the displacer 1 is initially at the first dead center, that is, at the widest point between 4 and 4, and the piston 12 of the compressor 9 is at the top dead center. Piston No. 2 (l-1: moves toward the bottom dead center and compresses the piston No. 2 of the compressor 9 by the amount of piston No. 2 (l-1: moves toward the bottom dead center). The silk heat generated at this time is removed in a cooler 6, for example by water cooling.

In the process of rotation 82, the piston 12 in the compression mode 9 stands still at the bottom dead center, and the piston 3 of the displacer J moves toward the top dead center. Depending on the stiffness, the refrigerant flows from space 4 to cooler 6.
It moves equally volumetrically in the order of the regenerator 2 - heat exchanger toilet 8 - space 5. The refrigerant that has passed through the regenerator 7 is rapidly cooled from the vicinity of the chamber jM and is sent into the space 5. At this time, the refrigerant undergoes an equal volume change, so it follows the ideal gas law.

Pressure decreases.

In the third process, the piston 2 of the compressor 9 moves toward the top dead center, and the pressure of the refrigerant further decreases. As a result, cold is generated in the heat exchanger 8, and the object to be cooled is cooled.

Then, in the fourth process, the piston 3 of the displacer 1 returns to the bottom dead center, and the refrigerant flows in the order of space 5 - heat exchanger 8 - regenerator 7 - cooler 6 - Shiba 4 in an equal volume. Moving. This completes one cycle.

In this way, in a Stirling rifle refrigerator, does the cooling performance depend on the cold storage effect of the cold storage device? Since the heat storage material 10 made of gadolinium gallium garnant is placed in a 3T magnetic field, -iJ As mentioned above, the extremely low 2:t below 5°
r! It is possible to maintain a high cold storage effect even in cold weather. Therefore, it is possible to provide a refrigerator that can significantly lower the lowest temperature reached.

Note that the present invention is not limited to the above embodiments.

For example, a rare earth magnetic material such as dysprosium aluminum garnet, dysprosium gallium garnet, gadolinium aluminum garnet, dysprosium phosphate, magnetically dispersed gadolinium, or univaropium sulfide may be used for the cold storage material 10.

Further, one aspect of the present invention is the above-mentioned Sterling Vehicle 'f! ? i
Of course, it can be applied not only to refrigerators but also to refrigerators using other regenerators such as the Gift McMahon rifle refrigerator.

[Brief explanation of the drawing]

Figure 1 is a characteristic diagram showing the effect of the present invention.
FIG. 2 is a diagram showing the specific heat distribution versus temperature of a gadolinium gallium garnant in a magnetic field of T. FIG. 2 is a vehicle diagram showing the configuration of a Stalinda FIV refrigerator according to an embodiment of the present invention. a...Gadolinium gallium in 3T is -net, b...fi'LC-(Coulobium i-ide, d...
Gadolinium gallium, 1...Dinugrates. 2...Cylinder, i, 12...Piston, 4,5
...Space, 6...Cooler, 7...Regenerator, 8...
・Cold extraction heat exchanger, 9...Compressor S 10...
・Cold storage material. 1)... Excitation device.

Claims (1)

[Claims] 0) A cold storage material made of rare earth magnetic material; and 7. A refrigerator characterized by being equipped with means for applying a predetermined magnetic field to the cold storage material. (2) The cold storage material is gadolinium gallium garnet (Gd
, Ga, O□), dysprosium aluminum garnet (
DysAlsO□), Dysprosium gallium garnet (Dy5GaaOt2) * Gadolinium aluminum garnet (Gds A150+z) h Dysprosium phosphate (Dypo, ), Gadolinium sulfate (odt (
804)s・8H,O)k or niurobium sulfide (Eu
8) The refrigerator according to claim 1Jj8i.