JPH047492Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a regenerator type refrigerator that uses high-pressure helium gas as a cooling medium and generates cold at extremely low temperatures.

[Prior Art] As one type of refrigerator, a regenerator type refrigerator that uses high-pressure helium gas or the like as a cooling medium has been widely used.

FIG. 4 is a sectional view showing a schematic configuration example of this type of Gifford-McMahon type regenerator type refrigerator. In FIG. 4, 1 is a compressor that supplies high-pressure helium gas as a cooling medium, 2 is a high-pressure helium gas pipe, 3 is a low-pressure helium gas pipe, 4 and 5 are high-pressure helium gas pipes 2,
Connector to low pressure helium gas piping 3, 6 is a motor housing, 7 is a motor, 8 is a motor shaft, 9 is a control valve that controls helium gas, 10 is a support base that supports the motor housing 6, 11 is a flow of helium gas 12 and 13 are helium gas passages; 14 is a seal; 15 is a sub-piston that controls the reciprocation of the displacer; 16 is a seal;
18 is a helium gas passage, 18 is a first-stage displacer, and 19 is a first-stage regenerator, which is usually made of stacked copper wire mesh or the like. Further, 20 is a first-stage cylinder, 21 is a helium gas passage, 22 is a first-stage cold generation section, 23 is a first-stage heat station for attaching objects to be cooled, 24 is a seal, and 25
2 is a second stage cylinder, and 26 is a second stage regenerator, which is usually filled with lead balls having a diameter of 1 mm or less. Further, 27 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 section, and 31 is a section for driving the sub-piston 15. It is a helium gas space.

In the regenerator type refrigerator having such a configuration, room-temperature helium gas that has been made highly pressurized by the compressor 1 enters the inside of the motor housing 6 through the high-pressure helium gas pipe 2 and the connector 4. On the other hand, as the motor 7 rotates, the rotary control valve 9 and the control block 1
1 controls the passage of high-pressure helium gas, and the sub-piston 15 controls the movement of the displacer, respectively. Further, the high-pressure helium gas passes through the helium gas passages 13 and 17 and is cooled in the first stage regenerator 19.
A part of it is stored in the first stage cold generation section 22. Further, the remaining high-pressure helium gas is further cooled through the second stage regenerator 26 and stored in the second stage cold generation section 30 through the helium gas passage 28.

FIG. 4 shows the case where each displacer 18, 27 is located at the top, and the first stage cold generation section 2
2 and the second stage cold generation section 30, high pressure and extremely low temperature helium gas is stored. Here, the control valve 9 is rotated by the rotation of the motor 7, and the respective cold generation sections 22 and 30 are connected to the low pressure helium gas pipe 3 of the compressor 1. the result,
The helium gas in each of the cold generation sections 22 and 30 undergoes adiabatic expansion, becomes even lower in temperature, and generates cold. After that, the respective cold occurrence sections 22 and 30
The first stage regenerator 1 cools the low-pressure helium gas in
9. In order to collect in the second stage regenerator 26, the first stage displacer 18 and the second stage displacer 27
is lowered by the action of the sub-piston 15. Furthermore, in order to introduce high-pressure helium gas into the first-stage cold generation section 22 and the second-stage cold generation section 30, the first-stage displacer 18 and the second-stage displacer 27 are raised, as shown in FIG. Return to state. By repeating the above cycle, the refrigerator can generate low temperatures intermittently.

[Problems to be solved by the invention] By the way, in the above-mentioned regenerator type refrigerator, the regenerator material (lead, copper, nickel, etc.) used as the regenerator material of the second stage regenerator 26 has a high temperature. As shown in Figure 5, when the temperature reaches an extremely low temperature of 10 ^K or less, the heat capacity, that is, the specific heat, decreases and the performance of the second stage regenerator 26 decreases, resulting in a decrease in the performance of the regenerator type refrigerator. There is. Therefore, in order to prevent such problems, the size of the second stage regenerator 26 is increased, or in other words, the regenerator 26 is increased in size by using a large amount of regenerator material.
However, this would not only increase the volume and weight of the regenerator 26 but also increase the cost.As a result, the volume and weight of the regenerator type refrigerator would increase and the cost would increase. There is also the problem that they are also expensive. Furthermore, since the cold storage material has a diameter of 1 mm or less, it is very difficult to manufacture the material (to make it into a predetermined diameter), and there is a problem that the cost of the refrigerator becomes higher.

Therefore, the present invention was developed to solve the above problems, and its purpose is to reduce the volume and weight of the regenerator, reduce costs, and improve the performance of the regenerator. It is an object of the present invention to provide a regenerator type refrigerator that is extremely easy to manufacture and has high reliability, which can reduce the volume, weight, and cost while improving the performance of the refrigerator.

[Means for solving the problem] In order to achieve the above object, the present invention is a regenerator type refrigerator that uses high-pressure helium gas as a cooling medium, and has a built-in regenerator whose low temperature side is 10 ^K or less. The displacer is characterized in that it is a laminated plate type displacer in which thin porous cold storage plates made of FRP and thin porous cold storage plates made of lead are alternately stacked and bonded.

[Function] In the regenerator type refrigerator having the above-mentioned configuration, the displacer with a built-in regenerator whose low temperature side is 10 ^K or less is alternately made of a thin porous regenerator plate made of FRP and a thin porous regenerator plate made of lead. As shown in Figure 5, thin porous lead regenerator plates with high specific heat are mainly used as the regenerator material on the high temperature side of the regenerator. In the temperature range below 10 ^k on the low temperature side of the regenerator, a thin porous regenerator plate made of lead and FRP, which has a specific heat almost equivalent to lead, are used.
Because both the thin porous regenerator plate and the thin porous regenerator plate played the role of regenerator material, it is possible to maintain performance comparable to conventional regenerators even in the temperature range of 10 ^K or less.

Therefore, in this invention, FRP is used as a displacer with a built-in regenerator whose low temperature side is 10 ^k or less.
Let's use a laminated plate-type displacer in which thin porous regenerator plates made of aluminum and thin porous regenerator plates made of conventional lead are stacked one on top of the other and bonded with an adhesive such as epoxy adhesive. That is.

[Example] Hereinafter, an example of the present invention based on the above-mentioned concept will be described with reference to the drawings.

FIG. 1 shows a cross-sectional view of a configuration example of a regenerator type refrigerator according to the present invention. The same parts as in FIG. I will only talk about. In Fig. 1, 32 is made by alternately stacking a large number of thin porous cold storage plates made of FRP and thin porous cold storage plates made of lead and bonding them with epoxy adhesive.
This is a laminated plate type displacer as a second stage displacer. Further, 33 is a joint for connecting the first stage displacer 18 and the laminated plate type displacer 32 described above to each other.

FIG. 2 shows the above-mentioned laminated plate type displacer 3.
2 is an exploded perspective view showing a configuration example of No. 2. In FIG. 2, numeral 34 is a thin porous cold storage plate made of lead, and no holes are formed in the peripheral part because it is adhesively bonded.
In addition, 35 is a thin porous cold storage plate made of FRP,
There are no holes in the surrounding area because it will be glued. Furthermore, 36 is an epoxy adhesive, a thin porous cold storage plate 34 made of lead, and a thin porous cold storage plate 35 made of FRP.
When the laminated plate-type displacer 32 is formed by adhering the circumferences of the displacer alternately, it has the role of sufficiently adhering and solidifying so that the high-pressure helium gas inside the displacer does not leak to the outside of the displacer. are doing.

FIG. 3 shows the above-mentioned laminated plate type displacer 3.
2 is a perspective view showing a second configuration example. As shown in FIG. 3, a thin porous cold storage plate 34 made of lead
Thin porous cold storage plates 35 made of FRP are alternately bonded and solidified with epoxy adhesive 36,
Its outer peripheral portion is machined to fit inside the second stage cylinder 25 described above. Furthermore, 37
is a seal groove for mounting the seal 24 described above.

In the regenerator type refrigerator having such a configuration, from the first stage regenerator 19 through the helium gas passage 21,
The high-pressure helium gas that has passed through the first stage cold generation section 22 enters a laminated plate type displacer 32 as a second stage displacer. At this time, the entire upper end face of the laminated displacer 32 serves as an inlet, and as there is no helium gas passage 21 as shown in FIG. 4, a biased flow occurs inside the laminated displacer 32. do not. Next, the low-pressure helium gas that generated cold in the second stage cold generation section 30 is
A laminated displacer 32 as a second stage displacer is entered. At this time as well, the entire surface of the inlet portion of the laminated displacer 32 serves as an inlet, and no drift of helium gas occurs. Next, the helium gas cooled in the laminated displacer 32 is further cooled in the first stage regenerator 19, and then returns to the compressor 1.

As described above, the regenerator type refrigerator according to this embodiment provides the following effects.

(a) As the cold storage material, a thin perforated plate is used instead of the conventional spheres with a diameter of 1 mm or less.
The production of the cold storage material becomes extremely easy and costs can be reduced.

(b) Since a helium gas passage is not required at the inlet and outlet of the displacer, the displacer can be made smaller and more compact.

(c) Since the perforated plate used can be used both as the inlet and the outlet, uneven flow of helium gas does not occur and the performance of the regenerator can be improved.

(d) Since the cold storage capacity does not decrease even at temperatures below 10 ^K ,
The performance of the regenerator can be improved.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be similarly implemented in the following manner.

In the embodiment shown in FIG. 1 described above, the present invention is applied to a regenerator type refrigerator, but the present invention is not limited to this, and the present invention can be similarly applied to, for example, cryogenic equipment using a regenerator. It is something that can be done.

In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.

[Effects of the invention] As explained above, according to the invention, in a regenerator type refrigerator that uses high-pressure helium gas as a cooling medium, a displacer with a built-in regenerator whose low temperature side is 10 ^K or less can be made from FRP. The laminate-type displacer is made by alternately stacking and bonding thin porous regenerator plates made of aluminum and thin porous regenerator plates made of lead, reducing the volume and weight of the regenerator, as well as lowering costs. Provides a regenerator type refrigerator that is extremely easy to manufacture and has high reliability, which can improve the performance of the regenerator while improving the performance of the refrigerant and reduce its volume, weight, and cost. can.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram showing an embodiment of the present invention;
FIG. 2 is an exploded perspective view showing a laminated plate type displacer in the same embodiment, and FIG. 3 is a perspective view showing a configuration example of the laminated plate type displacer in the same example.
Fig. 4 is a cross-sectional configuration diagram showing a conventional regenerator type refrigerator, and Fig. 5 is a comparison diagram of specific heats of FRP (G-10), lead, and helium gas. 1... Compressor, 2... High pressure helium gas piping,
3...Low pressure helium gas piping, 4, 5...High pressure helium gas piping 2, connector with low pressure helium gas piping 3, 6...Motor housing, 7...Motor, 8...Motor shaft, 9...Control valve , 10...
...Support stand, 11...Control block, 12, 13...
...Helium gas passage, 14...Seal, 15...
...Sub-piston, 16... Seal, 17... Helium gas passage, 18... First stage displacer, 19... First stage regenerator, 20... First stage cylinder, 21... Helium gas passage Passageway, 22...First stage cold generation section, 23...First stage heat station, 24...Seal, 25...Second stage cylinder, 26...Second stage regenerator, 27...Second stage day Sprayer, 28...Helium gas passage, 29
...Second stage heat station, 30...Second stage cold generation section, 31...Helium gas space, 32
...Laminated plate type displacer, 33...Joint, 34...Thin porous regenerator plate made of lead, 35...
Thin porous cold storage plate made of FRP, 36...Epoxy adhesive, 37...Seal groove.

Claims (1)

[Scope of utility model registration request] In a regenerator type refrigerator that uses high-pressure helium gas as a cooling medium, a displacer with a built-in regenerator whose low temperature side is 10 ^K or less is constructed using a thin porous regenerator plate made of FRP and a thin porous regenerator plate made of lead. A regenerator type refrigerator characterized by having laminated plate displacers which are alternately stacked and bonded.