JPH0614866U - Regenerator refrigerator - Google Patents

Abstract

(57) [Summary] [Purpose] In a GM cycle refrigerator, the same level of regenerator capacity as the conventional regenerator can be maintained, and 1) the structure is simple and the number of parts is small, and the manufacturing cost can be reduced. 2) It is an object of the present invention to provide such a refrigerator in which equipment for assembling (presses for pressing wire mesh, etc.) is unnecessary, and 3) the porosity (porosity) in the regenerator is averaged to reduce the pressure drop of fluid. . [Structure] In a regenerator refrigerator using high-pressure helium gas as a cooling medium, a porous metal fiber sintered product 20 or a stainless wire mesh is used in combination as a regenerator material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a regenerator refrigerator.

[0002]

[Prior art]

 In the case of a conventional two-stage GM cycle refrigerator as shown in FIG. 1, for example, the material of the first-stage regenerator 10 is a copper alloy wire mesh (180 to 200 mesh, wire diameter 0.08 to 0.1 mm). In addition, as the regenerator material for the second stage regenerator 15, lead balls (particle size: 0.3 to 0.5 mm) are generally used. In the case of such a configuration, the number of wire meshes as the first-stage regenerator material is about 800, and there is a drawback that the number of assembling steps is increased and equipment such as a press as shown in FIG. 5 is required.

[0003]

[Problems to be solved by the device]

 In view of the problems of the conventional technology, in the GM cycle refrigerator, the same regenerator capacity as the conventional regenerator can be maintained, and 1) the structure is simple and the number of parts is small and the manufacturing cost can be reduced. 2) Assembly It is an object of the present invention to provide such a refrigerator in which the above equipment (presses for pressing wire mesh) is unnecessary, and 3) the porosity (porosity) in the regenerator is averaged and the pressure drop of the fluid can be reduced.

[0004]

[Means for Solving the Problems]

 In a regenerator refrigerator that uses high-pressure helium gas as a cooling medium, a porous metal fiber sintered product or a wire mesh was used in combination as a regenerator material.

[0005]

【Example】

 FIG. 1 shows a conceptual diagram of a known GM cycle refrigerator, and FIG. 2 shows a sectional view of a conventional one-stage regenerator. The first-stage regenerator 10 is a copper alloy wire mesh (for example, red copper wire mesh 180 mesh, wire diameter 0.08 mm) punched out according to the dimensions of the regenerator, and about 800 sheets are sequentially pressed ( The first stage regenerator was made by stacking while pressing it in Fig. 5). This has the problem described above, and the present invention solves this problem.

Now, FIG. 3 shows a sectional configuration of the first-stage regenerator according to the present invention. This regenerator has a plurality of blocks 20 (in the illustrated embodiment, a block 20) of metal fibers (metal fibers having a diameter of about 30 to 90 microns and a length of about 2 to 6 mm) that are sintered to the dimensions of the regenerator. (Material C 1100, porosity 70%, outer diameter 75 mm, thickness 19 mm, quantity of 3 pieces, partly made of stainless steel wire mesh 200a 21b for the purpose of reducing heat conduction in the fluid flow direction) Have been inserted. As another regenerator material, the regenerator material 22 such as copper alloy, bronze, stainless steel or the like can be considered as the material of the metal fiber (see FIG. 4), and the porosity of 40 to 80% can be used.

FIG. 6 shows the cooling performance result of the conventional one-stage regenerator shown in FIG. 2, and FIG. 7 shows the cooling performance result of the one-stage regenerator (see FIG. 3) according to the present invention. Comparing the two, it was found that the lowest temperature reached was 26.3k in the conventional method and 28.3k in the present invention, which was almost the same cooling performance.

[0008]

【effect】

 A porous metal fiber sintered product was used as the regenerator material of the regenerator type refrigerator. Alternatively, since the metal mesh is used in combination with the sintered metal fiber product, it is possible to maintain the same level of cold storage capacity as a conventional cold storage device, and the structure is simple, the number of parts is small, and the manufacturing cost is reduced. It became unnecessary to use a press to press the wire mesh, and the porosity in the regenerator was averaged to reduce the pressure drop of the fluid.

[Brief description of drawings]

FIG. 1 shows a known GM cycle refrigerator.

FIG. 2 is a sectional view of a known one-stage regenerator.

FIG. 3 is a sectional view of a regenerator according to the present invention.

FIG. 4 also shows another embodiment.

FIG. 5 is a conceptual diagram of a conventional regenerator assembly device.

FIG. 6 is a graph showing the cooling performance of a known one-stage regenerator.

FIG. 7 is a graph showing the cooling performance of the one-stage regenerator according to the present invention.

[Explanation of symbols]

1 Helium compressor 2 Intake valve 3 Exhaust valve 4 Driving motor 5 Motor shaft 6 Crank mechanism 7 Gas passage 8 1-stage cylinder 9 1-stage displacer 10 1-stage regenerator (wire mesh) 11 1-stage heat -Tostation 12 1-stage expansion space 13 2-stage cylinder 14 2-stage displacer 15 2-stage regenerator (lead ball) 16 2-stage heat station 17 2-stage expansion space 18a, 18b Gas flow paths 19a, 19b Gas Flow path 20 Regenerator material 21a, 21b Wire mesh 22 Regenerator material 23 Plug 24 Pin 25 Wire mesh

Claims (2)

[Scope of utility model registration request] 1. A regenerator refrigerator using high-pressure helium gas as a cooling medium, wherein a porous metal fiber sintered product is used as a regenerator material. 2. The regenerator refrigerator according to claim 1, wherein a metal mesh is used in combination with a metal fiber sintered product as a regenerator material.