JPH0737099Y2 - Cold transport equipment - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention, for example, when the object to be cooled cannot be directly cooled by a refrigerating device due to space or heating, a helium gas refrigerant is placed at a remote position. The present invention relates to a cold transport device applied to transport and cool an object to be cooled prepared therein.

(Prior Art) Conventionally, in the case of cooling an object to be cooled provided at a position distant from the refrigeration system, for example, as shown in FIG.
The refrigerating apparatus c for pre-cooling provided with the heat station b cooled by the helium gas refrigerant supplied by the above, and the cooled object provided at a position remote from the first cooling stage d in thermal contact with the heat station b. A cooling medium transport device h including a cooling medium supply compressor g that supplies a cooling medium to the second cooling stage f that is in thermal contact with the body e is provided to cool the cooling target body e. In this case, a small refrigerator such as a GM cycle or a solver cycle is used as the pre-cooling refrigeration apparatus c, and the heat station b is cooled by the expanded refrigerant to about 70K or less. Then, the room temperature refrigerant discharged from the refrigerant supply compressor g is heat-exchanged with the refrigerant returned to the compressor g which has been cooled to about 70 K by the heat exchanger i, and further contacts the heat station b. It is cooled to 70 K in the first cooling stage d and flows to the second cooling stage f, where the object e to be cooled is cooled and heat-exchanged with the refrigerant from the compressor g through the heat exchanger i to perform compression. Return to the suction side of machine g.

Further, as shown in FIG. 4, a second-stage heat station j, which is cooled to about 20K or less, is additionally provided in the heat station b of the pre-cooling refrigeration system c, and the first cooling stage d is changed to the second cooling stage f. Is connected to a third cooling stage 1 provided in thermal contact with the second-stage heat station j via a second heat exchanger k, and the third cooling stage 1 is connected to the third cooling stage l. Further, the second cooling stage n brought into contact with the second object to be cooled m and the second heat exchanger k
There is also known a cold transportation device which is connected to a return pipe from the cooling stage f to the heat exchanger i. In this, the room temperature refrigerant sent from the precooling compressor a of the precooling refrigeration system c is heat-exchanged with the refrigerant returned to the compressor g cooled to about 70K by the heat exchanger i, Further, it is cooled by the heat station b in the first cooling stage d, a part of the refrigerant flows to the second heat exchanger k, and the rest flows to the second cooling stage f of 70K. The refrigerant that has flowed to the second cooling stage f returns to the compressor g through the heat exchanger i after cooling the cooled object e as in the case of FIG. The refrigerant flowing into the second heat exchanger k exchanges heat with the refrigerant returned to the first heat exchanger i cooled to about 20K and then cooled by the second heat station j in the third cooling stage l. , To the fourth cooling stage n. Here, after cooling the 2nd to-be-cooled object m and exchanging heat with the refrigerant which goes to the 3rd cooling stage 1 in the 2nd heat exchanger k, it merges with the refrigerant which has cooled the to-be-cooled object e, and heat exchanger i And returns to the compressor g through which heat is exchanged with the refrigerant flowing to the first cooling stage d in the heat exchanger i.

(Problems to be Solved by the Invention) The above-described conventional cold transport apparatus for cooling a cooled object is a double pipe having a passage through which a gas to be cooled flows in the center of a passage through which a refrigerant flows. A heat exchanger of the type having a configuration and a metal mesh provided in each passage is used,
This type of heat exchanger needs to be manufactured according to the performance of the cold transportation device, and has the disadvantage that it is not easy to manufacture and is expensive. As a device for cooling the refrigerant, a regenerator that stores a regenerator made of copper mesh or small particles of lead is commercially available, but it needs to cool after performing a heat dissipation action, and heat absorption and heat dissipation Must be used repeatedly.

An object of the present invention is to obtain a simple and inexpensive cold transportation device by using a regenerator without using a heat exchanger.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a precooling refrigeration apparatus including a heat station that is cooled by a refrigerant supplied by a precooling compressor, and a thermal station for the heat station. And a refrigerant transporting device including a refrigerant supply compressor for supplying a refrigerant from the first cooling stage in contact with the second cooling stage in thermal contact with the object to be cooled to cool the object to be cooled. In this case, the discharge side and the suction side of the refrigerant supply compressor are connected to a single pipe with a regenerator interposed in the middle through open / close valves, and the tip of the pipe is extended to The first cooling stage and the second cooling stage were sequentially interposed, and the end of the pipe was closed to make thermal contact with the heat station to form the third cooling stage.

(Operation) The pre-cooling compressor is operated to send the refrigerant to the heat station, the temperature of which is cooled to about 70 K or less, and the refrigerant supply compressor of the refrigerant transport device is operated in this state. Then, the valve on the discharge side of the refrigerant supply compressor is opened, and the refrigerant is cooled by the regenerator intervening in the pipe and then further cooled to about 70K by the first cooling stage in contact with the heat station, and then cooled to the second cooling stage. It is sent and the object to be cooled is cooled there. The end of the pipe is closed and brought into thermal contact with the heat station, and the heat of the object to be cooled absorbed by the refrigerant and the compression heat of the refrigerant are removed. Next, close the discharge side opening / closing valve of the refrigerant supply compressor and open the suction side opening / closing valve,
The cooled refrigerant is recovered to the refrigerant supply compressor through the first cooling stage and the regenerator. When the cooled refrigerant passes through the regenerator, the regenerator of the regenerator is cooled. By repeating such an operation, the cooled object in contact with the second cooling stage is cooled to about 70K or less.

Since the object to be cooled is cooled by reciprocating the refrigerant from the refrigerant supply compressor to the second cooling stage via a single pipe, the regenerator containing the regenerator can repeat heat absorption and heat dissipation. It is possible to carry out cold transport for cooling the object to be cooled at a remote position without using a heat exchanger of the type in which a reciprocating pipe for the refrigerant is provided.

(Embodiment) When an embodiment of the present invention is used based on FIG. 1, a reference numeral (1) in the drawing is a heat station (3) cooled by a refrigerant supplied by a precooling compressor (2). GM cycle or solve cycle pre-cooling refrigeration equipment equipped with
(4) is from the first cooling stage (5) provided in thermal contact with the heat station (3) to the second cooling stage (7) in thermal contact with the object (6) to be cooled at a remote position. For example, a refrigerant transport device including a refrigerant supply compressor (8) for supplying a refrigerant such as helium gas is shown. An on-off valve (9) is provided on each of the discharge side and the suction side of the refrigerant supply compressor (8).
It is connected to one pipe (12) with a regenerator (11) interposed midway through (10), the tip of the pipe (12) is extended, and the first cooling stage (5) and The second cooling stage (7) is sequentially interposed. The end of the pipe (12) is closed and thermally contacted with the heat station (3) to form a third cooling stage (13). The regenerator (11) is configured by accommodating a regenerator made of a copper mesh in a refrigerant passage inside a casing of the pipe (12).
When the temperature of the refrigerant passing through is higher than the temperature of the regenerator, the regenerator takes heat from the refrigerant to cool the refrigerant, and the temperature of the refrigerant passing through the pipe (12) is higher than the temperature of the regenerator. When the temperature is low, heat is taken from the regenerator to cool the regenerator.

The operation will be described. The pre-cooling compressor (2) of the pre-cooling refrigeration system (1) is operated to allow a refrigerant such as helium gas to flow through the heat station (3), and the heat station (3) is operated at, for example, 70K or less. After cooling to 1, the refrigerant supply compressor (8) of the refrigerant transport device (4) is operated. Then, the opening / closing valve (9) on the discharge side of the refrigerant supply compressor (8) is opened, and the compressed refrigerant such as helium gas is sent to the pipe (12). The refrigerant is heat-exchanged through the regenerator (11) to be cooled, and then heat-exchanged with the heat station (3) in the first cooling stage (5) to be further cooled. This cooled refrigerant goes to the second cooling stage (7) and cools the object to be cooled (6). The refrigerant comes to have heat from the object to be cooled (6) and heat due to compression,
Such heat is absorbed by the heat station (3) in the third cooling stage (13) at the end of the pipe (12). Next, the discharge side valve (9) of the refrigerant supply compressor (8) is closed and the suction side opening / closing valve (10) is opened.
As a result, the refrigerant in the pipe (12) exchanges heat through the first cooling stage (5) and the regenerator (11) and is recovered by the refrigerant supply compressor (8).

The above is one cycle of operation, and by opening and closing the open / close valves (9) and (10) periodically alternately, the above cycle is repeated and the object to be cooled (6) is cooled. Since it reciprocates in the single pipe (12) connecting the third cooling stages (5), (7) and (13), the heat of the refrigerant can be exchanged by the regenerator (11), which is difficult to design and manufacture. Efficient cooling can be performed without using a vessel.

When cooling another second cooled body (14) in addition to the cooled body (6), the heat station (3) of the precooling refrigeration system (1) is further heated to, for example, 20K as shown in the second illustration. A second stage heat station (15) to be cooled is connected in series to form a second stage, and the first stage and the regenerator (11) of the pipe (12) are connected.
Branch pipe (16) branched from between the cooling stages (5)
Is provided, and the second regenerator (1
7), a fourth cooling stage (18) that is in thermal contact with the second stage heat station (15), and a second object to be cooled (14)
The fifth cooling stage (19) that is in thermal contact with
The sixth cooling stage (20), which closes the end of the branch pipe (16) and is in thermal contact with the second-stage heat station (15), is constituted by the following operation. 14) Cooling is performed.

That is, the precooling refrigeration system (1) is operated to cool the heat station (3) to, for example, 70K and the second stage heat station (15) to, for example, 20K to supply the refrigerant to the refrigerant transportation device (4). The compressor (8) is operated and the open / close valve (9) on the discharge side is opened. As a result, the refrigerant flows through the pipe (12) to the end while exchanging heat with the regenerator (11), but part of the refrigerant passes through the branch pipe (16) and exchanges heat with the second regenerator (17). While flowing to the end. The refrigerant flowing through the pipe (12) and the branch pipe (16) is further cooled by the first cooling stage (5) and the fourth cooling stage (18) on the way, and the cooled object (6) and the second
It heads to the second cooling stage (7) and the fifth cooling stage (19) to cool the object to be cooled (14). Then, in the third cooling stage (13) and the sixth cooling stage (20),
Heat removal and compression heat removal of the cooled object (6) and the second cooled object (14) are performed, respectively.

Next, when the opening / closing valve (9) on the discharge side of the compressor (8) for supplying refrigerant is closed and the opening / closing valve (10) on the suction side is opened, the refrigerant in the pipe (12) and the branch pipe (16) is stored in the regenerator ( 1
1) The refrigerant is collected in the refrigerant supply compressor (8) while cooling the second regenerator (17). 2 by repeating this
It is possible to cool two objects to be cooled at the same time.

In the experiment shown in the second illustration, the heat station (3) of the precooling refrigeration system (1) was cooled to 70K, the second stage heat station (15) was cooled to 20K, and the second cooling stage (7) was cooled to 1K.
When heat of 0 W and 1 W of heat was applied to the fifth cooling stage (19), a temperature of 84.7 K was obtained in the second cooling stage (7) and a temperature of 20.2 K was obtained in the fifth cooling stage (19). Moreover, the reached temperature is 62.5K in the second cooling stage (7),
It was 16.6K in the 5th cooling stage (19).

(Effects of the Invention) As described above, according to the present invention, the refrigerant transporting device for supplying the refrigerant from the first cooling stage in contact with the heat station of the precooling refrigerating device to the second cooling stage in contact with the object to be cooled. In this case, the discharge side and the suction side of the refrigerant supply compressor are connected to one pipe having a regenerator in the middle through open / close valves, and the first and second cooling stages are provided in the middle of the pipe. Since the third cooling stage is arranged so as to be in contact with the heat station by closing the end of the pipe,
Refrigerant reciprocates in a single pipe, and the refrigerant can be heat-exchanged with a regenerator that is cheaper than a heat exchanger, facilitating the manufacture of a cold transport device for cooling a remote object to be cooled. There is an effect such as.

[Brief description of drawings]

1 is a diagram of an embodiment of the present invention, FIG. 2 is a diagram of another embodiment of the present invention, and FIGS. 3 and 4 are diagrams of a conventional example. (1) …… Refrigerator for pre-cooling (2) …… Compressor for pre-cooling (3) …… Heat station (4) …… Refrigerant transporter (5) …… First cooling stage (6) …… Cooled object (7) …… Second cooling stage (8) …… Refrigerant supply compressor (9) (10) …… Opening / closing valve (11) …… Regenerator (12) …… Pipe (13) …… Third cooling Stage (14) …… Second cooling target (15) …… Second stage heat station (16) …… Branch pipe (17) …… Second regenerator (18) …… Fourth cooling stage (19)… … Fifth cooling stage (20) …… Sixth cooling stage

Claims (2)

[Scope of utility model registration request] 1. A refrigeration unit for precooling, comprising a heat station cooled by a refrigerant supplied by a precooling compressor,
And a refrigerant transporting device having a refrigerant supply compressor for supplying a refrigerant from the first cooling stage in thermal contact with the heat station to the second cooling stage in thermal contact with the object to be cooled. In a device for cooling a cooling body, the discharge side and the suction side of the refrigerant supply compressor are connected to a single pipe with a regenerator interposed midway through open / close valves, and the tip of the pipe is extended. Then, the first cooling stage and the second cooling stage are sequentially interposed in the middle thereof, and further, the end of the pipe is closed to thermally contact the heat station to form a third cooling stage. Cold transport equipment. 2. A second stage heat station is further connected to the heat station so as to form two stages, and a branch pipe is provided by branching between the regenerator and the first cooling stage of the pipe, and the branch pipe. In the middle of the process, a fourth cooling stage that is in thermal contact with the second regenerator and the second-stage heat station and a fifth cooling stage that is in thermal contact with the second object to be cooled are interposed, and the end of the branch pipe is The cold transport apparatus according to claim 1, wherein the cold transport apparatus is configured as a sixth cooling stage that is closed to thermally contact the second-stage heat station.