JPH04187B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cold gas refrigerator that generates extremely low temperatures, and is used, for example, to cool superconducting magnets.

(Prior Art) A conventional device of this type is disclosed in Japanese Patent Publication No. 46-40595. To explain this based on FIG. 1, the expansion space 1 communicates with the compression space 2 via a regenerator 3 and a radiator 4.

One end of the conduit 7 communicates with the expansion space 1 via the discharge valve 5 , and the other end communicates with the expansion space 1 via the suction valve 6 . An external cooling point 8 is then arranged on the conduit 7 .

The volumes of the expansion space 1 and the compression space 2 change with a phase difference of about 90 degrees, and the working gas reciprocates between the expansion space 1 and the compression space 2, generating a low temperature in the expansion space 1. .

Here, due to the pressure fluctuation of the working gas in the expansion space 1, a part of the working gas which has become low temperature flows out from the discharge valve 5 through the conduit 7 to the external part 8, and after cooling the external part, the suction valve 6 into the expansion space 1.

(Problem to be solved by the invention) However, in this prior art, the expansion space 1
The working gas flows out from the discharge valve 5 to the external location 8 only when the working gas inside is at high pressure. Therefore,
Since the working gas temperature depends on the working gas pressure, the working gas temperature supplied to the external location 8 will be higher than the lowest temperature occurring in the expansion space 1, so that the external location 8 is efficiently cooled. It wasn't something.

Therefore, the technical objective of the present invention is to efficiently cool an external location at a temperature as close as possible to the lowest temperature generated by the refrigerator.

[Structure of the invention]

(Means for Solving the Problems) The technical means of the present invention taken to solve the above-mentioned technical problems of the present invention are as follows:
an expansion space, an expansion space in communication with the expansion space via a regenerator and a radiator, a working gas that reciprocates between the expansion space and the compression space to transfer heat from a low temperature level to a high temperature level; A high-pressure tank that is in thermal contact with the low-temperature side of the space or regenerator and communicates with the expansion space via a discharge valve; a conduit that communicates the high-pressure tank with the expansion space, regenerator, radiator, or compression space; and a conduit. It consists of a flow rate adjustment valve, an external part, a low pressure tank, and a suction valve arranged in series from the high pressure tank side.

(Function) According to the technical means of the present invention described above, a part of the working gas in the expansion space passes through the discharge valve and is stored in the high-pressure tank, where the working gas is stored in the expansion space or on the low temperature side of the regenerator. It is cooled to a temperature close to the average temperature of the working gas. This cooled working gas is regulated by a flow rate regulating valve, undergoes Joel-Thompson expansion, becomes even cooler, and enters the low pressure tank after cooling the external parts. The working gas stored in the low pressure tank flows into the expansion space, regenerator, radiator, or compression space via the suction valve.

Therefore, the external location is efficiently cooled to a temperature as close as possible to the lowest temperature generated by the refrigerator.

(Example) In FIG. 2, an expansion space 1 communicates with a compression space 2 via a regenerator 3 and a radiator 4.

The high pressure tank communicates with the expansion space 1 via a discharge valve 5 and one end of a conduit 12.
This high-pressure tank 9 is in contact with the expansion space 1 or the low temperature side (expansion space 1 side) of the regenerator 3 for heat exchange.

The other end of the conduit 12 communicates with one end of a flow rate regulating valve 10, and the other end of the flow rate regulating valve 10 communicates via a conduit 13 with one end of an external location 8, which is a part to be cooled.
Further, the other end of the external portion 8 communicates with one end of a low pressure tank 11 via a conduit 14, and the other end of the low pressure tank 11 communicates a conduit 15 and an intake valve 6 with the expansion space 1.

Although the suction valve 6 is in communication with the expansion space 1 here, it may also be in communication with the regenerator 3, the radiator 4, or the compression space 2.

The operation of the embodiment of the present invention will be explained below. The volume of expansion space 1 and compression space 2 changes with a phase difference of approximately 90°,
The working gas reciprocates between the spaces 1 and 2 via the regenerator 3 and the radiator 4, generates a low temperature in the expansion space 1, and the working gas becomes low temperature. When the pressure in the expansion space 1 exceeds the opening pressure of the discharge valve 5, a part of this low-temperature working gas flows into the high-pressure tank 9, exchanges heat with the low-temperature side of the expansion space 1 or the regenerator 3, and is cooled. Ru.

This low-temperature, high-pressure working gas undergoes Joel-Thomson expansion at a constant flow rate by the flow rate regulating valve 10, becomes further cooled, flows through the external location 8, and after cooling the external location 8 flows into the low-pressure tank 11. Thereafter, it flows from the low pressure tank 11 into the expansion space 1 via the suction valve 6.

〔Effect of the invention〕

According to the present invention, the working gas flowing out into the high-pressure tank is precooled by the expansion space or the low temperature side of the regenerator, and then recooled by the expansion action of the flow rate regulating valve, so that the external location is sufficiently cooled. cooled down.

Also, due to the action of high pressure tank and low pressure tank,
The working gas flowing through the conduit is less susceptible to pressure fluctuations in the expansion space, making it possible to continuously cool external locations.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of a prior art cold gas refrigerator. FIG. 2 shows a sectional view of a cold gas refrigerator according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Expansion space, 2... Compression space, 3... Regenerator, 4... Heat radiator, 5... Discharge valve, 6... Suction valve, 9... High pressure tank, 8... External location, 10...
...Flow rate adjustment valve, 11...Low pressure tank, 12,1
3,14... Conduit.

Claims (1)

[Claims] 1. An expansion space, a compression space communicating with the expansion space via a regenerator and a radiator, and reciprocating movement between the expansion space and the compression space to transfer heat from a low temperature level to a high temperature. a high-pressure tank in thermal contact with the expansion space or the cold side of the regenerator and communicating with the expansion space via a discharge valve; the high-pressure tank and the expansion space; A cold gas refrigeration system comprising: a conduit that communicates with a regenerator, the heat radiator, or the compression space, a flow rate adjustment valve, an external location, a low pressure tank, and a suction valve arranged in series on the conduit from the high pressure tank side. Machine.