JPH04196B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigeration system in which two systems of refrigerators, one in a high temperature region and the other in a low temperature region, are thermally coupled by a cold circulation circuit. It is a refrigerator in the low temperature range.
It efficiently generates refrigeration at a temperature of 10K or less, and is used in refrigeration equipment to cool Skitt elements, Josephson elements, etc.

(Prior Art) A refrigeration system related to the present invention is conventionally disclosed in US Pat. No. 4,335,579.

This prior art, as shown in FIG. 6, uses a crankshaft 20 rotated by a power source 201.
2. Piston 203 driven by the crankshaft 202, expansion spaces 204, 205,
A high temperature region refrigerator having low temperature parts 206 and 207, a crankshaft 209 rotated by a power source 208, pistons 210 and 211 driven by the crankshaft 209, a compression space 212, an expansion space 213, It is equipped with a low temperature region refrigerator having a radiator 214 and a regenerator 215.

Both ends of the radiator 214 are connected to the compression space 212 and the regenerator 215 through piping, respectively, and the radiator 214 is thermally coupled to the low temperature section 207 and is connected to the compression space of the refrigerator in the low temperature region. 21
The heat of compression of the working medium generated in step 2 is radiated by a radiator 214.

(Problems to be Solved by the Invention) However, in this conventional system, the radiator 214 of the refrigerator in the low temperature region is connected to the low temperature section 214 of the refrigerator in the high temperature region.
7, the volume of the piping from the compression space 212 to the radiator 214 and the piping between the radiator 214 and the regenerator 215 becomes dead volume, reducing the efficiency of the refrigerator in the low temperature region. Since the efficiency of the refrigeration system decreases, the radiator 214 must be placed as close to the low temperature section 207 as possible to reduce the dead volume.

As a result, the refrigerator in the low-temperature region and the refrigerator in the high-temperature region must be placed as close as possible, and there is a drawback that the refrigerator in the low-temperature region and the refrigerator in the high-temperature region cannot be freely arranged.

In addition, in order to efficiently achieve refrigeration at a temperature of 10K or less with a refrigerator in the low temperature region, the pressure of the working medium in the refrigerator in the high temperature region must be relatively high, and the pressure of the working medium in the refrigerator in the low temperature region must be relatively high. The disadvantage is that helium must be used at a lower pressure, resulting in a longer time for the working medium in the expansion space of the refrigerator to begin to cool down in the cold region and to reach steady state.

Therefore, the present invention provides (1) to freely arrange and thermally connect a refrigerator in a low temperature region and a refrigerator in a high temperature region while maintaining good efficiency of the refrigeration system; and (2) ) The technical objective is to shorten the precooling time during which the working refrigerant in the expansion space of a refrigerator in the low-temperature region begins to cool down and reaches a steady state.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above technical problems, the technical measures taken in the present invention include a first compression space, a first radiator, a first regenerator, and a first heat exchanger. and a first expansion space, a second compression space supported by a supporter, a second radiator, a second regenerator, a second heat exchanger, and a second expansion space. a first cold circulation circuit that thermally couples a second radiator and a first heat exchanger; a supporter; a second regenerator; a second heat exchanger; and a second expansion space. a second cold circulation circuit that thermally couples at least one of the above and the first heat exchanger; a blower that acts commonly on the first and second cold circulation circuits; , a valve means is provided that is opened only during precooling of the refrigerator for low temperature region.

(Operation) The above technical means operates as follows. That is, the heat generated in the second compression space of the refrigerator for low temperature region is absorbed by the refrigerant circulating in the first cold circulation circuit by the blower in the second radiator, and the heat is absorbed and the temperature rises in the first cold circulation circuit. The temperature of the refrigerant in the circuit is lowered in the first heat exchanger, where it is frozen by the refrigeration generated in the first expansion space of the high-temperature region refrigerator, so the low-temperature region refrigerator is placed sufficiently far from the high-temperature region refrigerator. can be done.

In addition, the second heat exchanger of the refrigerator for low temperature region, the second
The regenerator and the second supporter are cooled by the refrigerant generated in the first expansion space of the high-temperature region refrigerator through the refrigerant circulated by the blower in the second cold circulation circuit, so the refrigerant for the low-temperature region is cooled. The working medium in the operating circuit of the machine is cooled to a temperature close to the temperature in the first expansion space of the high-temperature region refrigerator without operating the low-temperature region refrigerator, and its pressure becomes lower than at room temperature, and The precooling time of the area refrigerator can be shortened.

(Example) An example of the present invention will be described based on FIG.

A compression space (first compression space) 1 includes a flow path 2a of a radiator (first radiator) 2 having a flow path 2b through which a cryogen such as water flows, a regenerator (first regenerator) 3, and a heat exchanger. It communicates with one end of the channel 4a of the vessel 4. The other end of the flow path 4a is connected to an expansion space 5 and one end of a regenerator (first regenerator) 6, and the other end of the regenerator 6 is connected to a heat exchanger (first heat exchanger) 7. The flow path 7a is in communication with the expansion space (first expansion space) 8.

The expansion spaces 5 and 8 are formed by a convex expansion cylinder 9 and a convex expansion piston 10 having piston rings 10a and 10b. Note that a rod 11 is fixed to the expansion piston 10.

The compression space 1 is formed by a compression cylinder 12 and a compression piston 13 having a piston ring 13a, and a rod 14 is fixed to the compression piston 13.

The rods 11 and 14 are connected to a drive unit (not shown), and the movement of the expansion piston 10 is controlled by the compression piston 13.
The phase has progressed by approximately 90° from the movement of .

The compression space 1, the heat radiator 2, the regenerators 3 and 6, the heat exchangers 4 and 7, and the expansion spaces 5 and 8 are filled with a working medium such as helium gas, and are used in a high-temperature region refrigerator (in this example, Stirling refrigerator) constitutes A.

On the other hand, a compressed space (second compressed space) 22 supported by a supporter 30 and formed by an elastic member 21 such as a bellows is sequentially compressed by a radiator (second radiator) 23.
It communicates with a flow path 23a, a regenerator (second regenerator) 24, a heat exchanger (second heat exchanger) 25, and an expansion space (second expansion space) 26.

The expansion space 26 is formed by an extensible member 27 such as a bellows, and the extensible members 21 and 27 are connected to a drive unit (not shown) via rods 28 and 29, respectively, and the movement of the rod 29 is approximately 90 degrees faster than the movement of the rod 28.゜The phase is made to advance.

The compression space 22, the heat radiator 23, the regenerator 24, the heat exchanger 25, and the expansion space 26 are filled with a working medium (for example, helium gas), and are used in a refrigerator for a low temperature region (in this embodiment, a Stirling cycle refrigerator). B
It consists of

In order to improve the efficiency of this refrigeration system, refrigerator B for the low-temperature region is filled with a relatively low-pressure working medium, and refrigerator A for the high-temperature region is filled with a relatively high-pressure working medium. There is.

The first cold circulation circuit D is provided with a discharge port of the blower 31, a flow path 7b of the heat exchanger 7, a valve 32, a flow path 23b of the radiator 23, and a suction port of the blower 31 in this order.

On the other hand, in the second cold circulation circuit C, the discharge port of the blower 31, the flow path 7b of the heat exchanger 7, the valve (valve means) 33, the flow paths 34a and 34b, the one-way valve 35,
A suction port for a blower 31 is provided. here,
The flow path 34a is thermally coupled to the expansion space 26, the heat exchanger 25, and the regenerator 24, and the flow path 34b is connected to the supporter 30.
is thermally coupled to.

The buffer tank 36 communicates with one end of a valve 38 and with one end of a flow path 4b of the heat exchanger 4, and the other end of the flow path 4b communicates with the suction port side of the blower 31 via a valve 37. In this way, the first and second cold circulation circuits C and D and the buffer tank 36 are filled with a refrigerant (cold) such as helium.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

The low-temperature refrigeration generated in the expansion space 8 of the high-temperature region refrigerator A is caused by the refrigerant flowing through the flow path 7b sent out from the blower 31 when the working medium flows through the flow path 7a of the heat exchanger 7. Cooling.

During precooling of the low-temperature region refrigerator B, the cooled refrigerant flows into the valve 32 of the first cold circulation circuit D and the valve 33 of the second cold circulation circuit C, respectively.

First, in the first cold circulation circuit D, the refrigerant that has passed through the valve 32 flows through the flow path 23b of the radiator 23 in the low temperature region refrigerator B, and flows through the flow path 23b of the radiator 23.
It exchanges heat with the refrigerant of the low-temperature region refrigerator B flowing through the refrigerant 3a, and is sucked into the blower 31. Therefore, in the low-temperature region refrigerator B, the refrigerant compressed and heated in the compression space 22 is cooled by the refrigeration generated in the expansion space 8 of the high-temperature region refrigerator A via the first cold circulation circuit D. be done.

On the other hand, in the second cold circulation circuit C, the refrigerant that has passed through the valve 33 flows through the flow path 34a, and flows through the expansion space 26 of the low-temperature region refrigerator B, the heat exchanger 25, and the regenerator 2.
4, it flows through the flow path 34b and the supporter 30
is cooled and sucked into the blower 31 via the one-way valve 35. Therefore, the main body of refrigerator B for low temperature region is connected to refrigerator A for high temperature region via second cold circulation circuit C.
It is pre-cooled by the refrigeration that occurs in the expansion space 8 of.

Then, when the temperature of the main body of the low-temperature region refrigerator B becomes approximately equal to the freezing temperature generated in the expansion space 8 of the high-temperature region refrigerator A, the valve 33 is closed and the precooling ends.

2 to 5 show modified embodiments of FIG. 1. FIG.

First, in FIG. 2, the first cold circulation circuit D2
is the valve 32 of the first cold circulation circuit D in FIG.
The other components are given the same reference numerals as in the embodiment shown in FIG. 1, and their explanation will be omitted. Further, the operation is also substantially the same as that of the embodiment shown in FIG. 1, and the explanation thereof will be omitted.

Next, in FIG. 3, the second cold circulation circuit C3
The one-way valve 35 and flow path 34b of the second cold circulation circuit C shown in FIG. 1 are removed, and the flow path 34a is thermally connected to the heat exchanger 25 and regenerator 24. are given the same reference numerals as those in the embodiment shown in FIG. 1, and their explanation will be omitted. Further, the operation is also substantially the same as that of the embodiment shown in FIG. 1, and the explanation thereof will be omitted.

In FIG. 4, the first cold circulation circuit D
4 is the valve 3 of the first cold circulation circuit D in FIG.
2 and the one-way valve 35 of the second cold circulation circuit C are removed, and the other components are given the same reference numerals as those of the embodiment shown in FIG. 1, and the explanation thereof will be omitted. Further, the operation is also substantially the same as that of the embodiment shown in FIG. 1, and the explanation thereof will be omitted.

Finally, in FIG. 5, the first cold circulation circuit D
5 is the valve 3 of the first cold circulation circuit D in FIG.
2 is removed, and the second cold circulation circuit C5 is obtained by replacing the one-way valve 35 of the second cold circulation circuit C in FIG. 1 with a valve 60, and the other components are the same as the embodiment in FIG. The explanation will be omitted by attaching the number code. Further, the operation is also substantially the same as that of the embodiment shown in FIG. 1, and the explanation thereof will be omitted.

〔Effect of the invention〕

As described above, in the present invention, the heat generated in the compression space of the refrigerator in the low-temperature region is absorbed by the refrigerant in the first cold circulation circuit that is circulated by the blower, and the refrigerant whose temperature has increased by absorbing heat. Since heat is radiated to the working medium of the high-temperature region refrigerator by the refrigeration generated in the expansion space of the high-temperature region refrigerator, the low-temperature region refrigerator cannot be placed sufficiently far from the high-temperature region refrigerator. can.

In addition, we also provide heat exchangers for refrigerators in low-temperature areas, regenerators,
The support is cooled by the refrigerant generated in the expansion space of the high-temperature region refrigerator via the refrigerant in the second cold circulation circuit that is circulated by the blower, so that the working medium in the working circuit of the low-temperature region refrigerator is cooled. is cooled to a temperature close to the temperature in the expansion space of the high-temperature region refrigerator without operating the low-temperature region refrigerator, and the pressure of the working medium is lower than that at room temperature, making it possible to shorten the precooling time.

[Brief explanation of drawings]

FIG. 1 shows a configuration diagram of a refrigeration system according to a first embodiment of the present invention. FIG. 2 shows a configuration diagram of a refrigeration system according to a second embodiment of the present invention. FIG. 3 shows a configuration diagram of a refrigeration system according to a third embodiment of the present invention. FIG. 4 shows a configuration diagram of a refrigeration system according to a fourth embodiment of the present invention. Figure 5 shows
A configuration diagram of a refrigeration system according to a fifth embodiment of the present invention is shown. FIG. 6 shows a configuration diagram of a conventional refrigeration system. 1... Compression space (first compression space), 2... Heat radiator (first heat radiator), 3, 6... Regenerator (first regenerator), 7... Heat exchanger (first heat exchanger) ), 8... Expansion space (first expansion space), 22... Compression space (second compression space), 23... Heat radiator (second radiator), 2
4... Regenerator (second regenerator), 25... Heat exchanger (second heat exchanger), 26... Expansion space (second expansion space), 30... Supporter, 31... Blower, 33 …
...Valve (valve means), A... Refrigerator for high temperature region, B...
...Refrigerating machine for low temperature region, D, D2, D4, D5...
First cold circulation circuit, C, C3, C4, C5... second cold circulation circuit.

Claims (1)

[Claims] 1. A high-temperature region refrigerator comprising a first compression space, a first radiator, a first regenerator, a first heat exchanger, and a first expansion space; A refrigerator for a low temperature region including a second compression space, a second heat radiator, a second regenerator, a second heat exchanger, and a second expansion space; a first refrigeration circuit that thermally couples the first heat exchanger to at least one of the support, the second regenerator, the second heat exchanger, and the second expansion space; 2 cold circulation circuits, a blower that acts commonly on the first and second cold circulation circuits, and a valve that is disposed in the second cold circulation circuit and is opened only when the low temperature region refrigerator is precooled. A refrigeration device having means.