JPH0528438Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a regenerator-type low-temperature device, and particularly relates to improvement of a regenerator.

[Prior Art] FIG. 6 is a schematic cross-sectional view of a Gifford-McMahon type regenerator type refrigerator, which is an example of a conventional regenerator type low temperature equipment. In the figure, 1 is a compressor that supplies a cooling medium such as high-pressure helium gas, 2 is a cooling medium such as high-pressure helium gas piping, 3 is a cooling medium such as low-pressure helium gas piping, 4 and 5 are connectors to the piping 2 and 3, and 6 is the motor housing, 7 is the motor,
8 is a motor shaft; 9 is a rotary type control valve for controlling a cooling medium such as helium gas; 10 is a support for the motor housing 6; 11 is a control body for controlling the flow of helium gas in combination with the control valve 9; 12 and 13 are passages for a cooling medium such as helium gas; 14 is a seal; 15 is a sub-piston that controls the reciprocation of displacers 18 and 27, which will be described later; 16 is a seal; 17 is a passage for a cooling medium such as helium gas; 18 1 is a first-stage displacer, and 19 is a first-stage regenerator, which is usually made of overlapping copper wire mesh or the like. 20 is the first stage cylinder,
21 is a passage for a cooling medium such as helium; 22 is a first-stage cold generation space; 23 is a first-stage heat station to which an object to be cooled is attached; 24 is a seal; 25
26 is a second stage cylinder, and 26 is a second stage regenerator, which is usually filled with lead balls or the like having a diameter of 1 mm or less. 2
7 is a second stage displacer, 28 is a helium gas passage, 29 is a second stage heat station for attaching objects to be cooled, 30 is a second stage cold generation space, 3
1 is a helium gas space for driving the sub-piston 15.

In the configuration as described above, room temperature helium gas made high pressure by the compressor 1 enters the inside of the motor housing 6 through the high pressure helium gas pipe 2 and the connector 4. Further, as the motor 7 rotates, the control valve 9 and the control body 11 control the high pressure helium gas passages 12 and 13 and the displacer 1.
8 and 27 are controlled. High-pressure helium gas passes through passages 13 and 17 and is cooled in a regenerator 19.
Passing through the passage 21, a part of the first stage cold generation space 2
It can be stored in 2. The remaining helium gas is further cooled through the second stage regenerator 26 and stored in the second stage cold generation space 30 through the passage 28 .

FIG. 6 shows the case where the displacers 18 and 27 are located at the top, and high-pressure and extremely low temperature helium gas is stored in the first-stage cold generation space 22 and the second-stage cold generation space 30. . Here, the control valve 9 is rotated by the rotation of the motor 7, and the cold generation spaces 22 and 30 are connected to the low pressure helium gas piping 3 of the compressor 1.
Continuing with. As a result, the helium gas in the cold generation spaces 22, 30 undergoes adiabatic expansion, becomes even lower in temperature, and generates cold. After that, cold generation space 2
Displacer 1
8 and 27 are lowered by the action of the sub-piston 15. Furthermore, high-pressure helium gas is supplied to the cold generation space 2.
Displacer 18,
27 rises and returns to the state shown in FIG. By repeating this cycle, the refrigerator can generate low temperatures intermittently.

FIG. 7 is a schematic plan view of the wire mesh regenerator used in the first stage regenerator 19 of FIG. 6, and FIG.
It is a cross-sectional view taken along the - line in the figure and viewed in the direction of the arrow, and shows a wire mesh made of copper wire and a large number of wire meshes stacked one on top of the other.

[Problems to be solved by the invention] As described above, the conventionally used cold storage material made of copper wire mesh has a low specific heat (heat capacity) when the temperature becomes low, and the performance of the cold storage device 19 deteriorates. In addition, materials such as lead, which have a large heat capacity at low temperatures, have low strength, so they have the disadvantage that they cannot be used as cold storage materials due to their wire mesh shape.
Therefore, when using copper wire mesh as a cold storage material,
Due to the decrease in the performance of the regenerator 19, the volume of the regenerator 19
This increases weight and costs. As a result, the regenerator type refrigerator had disadvantages such as decreased performance, increased volume and weight, and increased cost.

Therefore, an object of the present invention is to provide a regenerator-type low-temperature device in which the performance of the regenerator is improved and wire rods can be easily processed into wire mesh.

[Means for Solving the Problems] In order to solve the above problems, the present invention uses wire rods that are easy to process as wire rods constituting cold storage material wire meshes.
A first metal material having a relatively large specific heat even at extremely low temperatures is used as a core material, and this first metal material is used as a core material, and a second metal material having a relatively large specific heat at extremely low temperatures compared to the first metal material is used as a core material. It is constructed by stacking a large number of wire meshes made of wire covered with.

[Function] The equivalent first metal material used in the center of the wire makes it easy to process the wire into a wire mesh.
Furthermore, the second metal material such as lead used in the peripheral portion increases the specific heat (heat capacity) at low temperatures, improving the performance of the regenerator.

[Embodiment] FIGS. 1, 2, and 3 are diagrams for explaining an embodiment of the present invention, and FIG. 1 shows a large number of gold stacked in the regenerator 19 shown in FIG. 6. FIG. 2 is an enlarged view of FIG. 1, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 1 in the direction of the arrow.

In FIGS. 1 to 3, 40 is the central part of the wire material, which is made of copper, which has high strength and is easy to process, and has a relatively large specific heat even at low temperatures. The surrounding area of the wire is made of lead material, which has a lower temperature and higher specific heat than the wire rod. FIG. 4 is a diagram showing the relationship between the temperature and specific heat of copper, and FIG. 5 is a diagram showing the relationship between the temperature and specific heat of lead.

In such a configuration, since the center portion 40 is strong and easy to process, it is possible to process the wire into a wire mesh shape or other shapes required for a cold storage material. Furthermore, since the peripheral portion 41 is coated with lead or the like, the decrease in heat capacity of the regenerator material can be reduced even at low temperatures, thereby improving the performance of the regenerator.

[Effects of the invention] According to the invention described above, the first metal material, which is easy to process and has a relatively large specific heat even at extremely low temperatures, is used as the core material for the wire constituting the wire mesh of the cold storage material. Since the core material is made of a first metal material, and a large number of wire meshes each made of a wire coated with a second metal material having a higher specific heat than the first metal material at extremely low temperatures is stacked, the center of the wire The first metal material used in the periphery makes it easy to process the wire into a wire mesh, and the second metal material used in the periphery increases the specific heat at low temperatures, improving the performance of the regenerator. We can provide low temperature equipment.

[Brief explanation of drawings]

Fig. 1 is a plan view of the main part of one embodiment of the present invention, that is, the cold storage material, Fig. 2 is an enlarged view of Fig. 1, and Fig. 3
The figure is a cross-sectional view taken along the - line in Figure 2 and viewed in the direction of the arrow, Figures 4 and 5 are diagrams showing the relationship between the temperature and specific heat of copper and lead, respectively, and Figure 6 is a conventional cold storage method. A schematic cross-sectional view showing an example of a low-temperature device,
FIG. 7 is a plan view showing the cold storage material of FIG. 6, and a sectional view taken along the - line of FIG. 8 and viewed in the direction of the arrow. 1...Compressor, 6...Motor housing, 7...
...Motor, 8...Motor shaft, 9...Control valve,
10... Support stand, 11... Control body, 15... Sub piston, 18... First stage displacer, 19
...First stage regenerator, 20...First stage cylinder, 2
5...Second stage cylinder, 26...Second stage regenerator,
27...Second stage displacer, 40...Center of the wire, 41...Periphery of the wire.

Claims (1)

[Scope of utility model registration request] In regenerator-type low-temperature equipment that uses high-pressure helium gas or the like as a cooling medium, the regenerator material filled into the displacer is made of a first metal material that is easy to process and has a relatively large specific heat even at extremely low temperatures. A large number of wire gauze formed by stacking the first metal material as a core material and a wire coated with a second metal material having a higher specific heat than the first metal material at extremely low temperatures. A regenerator-type low-temperature device featuring: