WO2015163703A1

WO2015163703A1 - Cryogenic refrigeration system

Info

Publication number: WO2015163703A1
Application number: PCT/KR2015/004044
Authority: WO
Inventors: 정우석
Original assignee: 주식회사 서남
Priority date: 2014-04-25
Filing date: 2015-04-23
Publication date: 2015-10-29

Abstract

Disclosed is a cryogenic refrigeration system. A cryogenic refrigeration system comprises: a cryogenic freezer; and a heat dissipation module for supplying and circulating a refrigerant that cools the cryogenic freezer. The heat dissipation module can comprise: a condenser for condensing the refrigerant; and a heat exchanger, placed on the cryogenic freezer, for circulating the refrigerant between the cryogenic freezer and the condenser and thereby cooling the cryogenic freezer.

Description

Cryogenic refrigeration system

The present invention relates to a cryogenic refrigeration system, and more particularly to a cryogenic refrigeration system that can increase the heat radiation efficiency.

In general, cryogenic freezers may be used to cool superconductors or small electronic components. For example, the cryogenic freezer may include a Stirling refrigerator, a GM refrigerator, and a Joule-Thomson refrigerator. Such cryogenic freezers may generate refrigeration output through expansion of a working fluid such as helium or hydrogen. The expansion process may involve exothermicity of the compression process. The cryogenic freezer can then be cooled by the radiator. Common cryogenic freezers can be cooled by dual radiators. The dual radiator may include a water cooled radiator and a vapor compression freezer. The water cooled radiator can cool the cryogenic freezer. The water cooled radiator can be cooled by a vapor compression freezer. However, since the water-cooled radiator uses water having low cooling efficiency as the refrigerant, it may reduce the heat radiation efficiency of the cryogenic freezer. In addition, water-cooled radiators and steam compressors can reduce the productivity by increasing the operating costs of cryogenic freezers.

An object of the present invention is to provide a cryogenic refrigeration system that can increase the heat radiation efficiency.

In addition, another object of the present invention to provide a cryogenic refrigeration system that can minimize the operating cost of the cryogenic freezer.

The present invention discloses a cryogenic refrigeration system. Its system includes a cryogenic freezer; And a heat dissipation module for cooling the cryogenic freezer. The heat dissipation module may include: a condenser disposed spaced apart from the cryogenic freezer and condensing a refrigerant cooling the cryogenic freezer; And a heat exchanger connected to the cryogenic freezer and circulating the refrigerant between the cryogenic freezer and the condenser to cool the cryogenic freezer.

The cryogenic refrigeration system according to another embodiment of the present invention includes a power generation unit, a power conversion unit for converting the power generated by the power generation unit, and a gas cooling unit for cooling the gas by the power converted in the power conversion unit. Cryogenic freezer; And a heat dissipation module configured to circulate a refrigerant for cooling the cryogenic freezer to the power generation unit, the power conversion unit, and the gas cooling unit.

As described above, the cryogenic refrigeration system according to the embodiments of the present invention may increase the heat dissipation efficiency of the cryogenic freezer by using a refrigerant having higher endothermic efficiency than water. Since the cryogenic freezer is cooled directly to the heat dissipation module, operating costs can be minimized.

1 is a view showing an example of the cryogenic refrigeration system of the present invention.

2 is a view showing the cryogenic freezer of FIG.

3 is a view showing another example of the cryogenic refrigeration system of FIG.

4 is a view showing another example of the cryogenic refrigeration system of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in different forms. Rather, the embodiments introduced herein are provided to ensure that the disclosure is thorough and complete, and that the spirit of the invention to those skilled in the art will fully convey, the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, including and / or comprising the components, steps, operations and / or elements mentioned exclude the presence or addition of one or more other components, steps, operations and / or elements. I never do that. It will also be understood in the specification that general mechanical terms relate to chambers, units, arms, links, blades, motors, pulleys, rotating shafts, belts, and the like. Since it is according to a preferred embodiment, reference numerals presented in the order of description are not necessarily limited to the order.

1 shows an example of the cryogenic refrigeration system 10 of the present invention. FIG. 2 shows the cryogenic freezer 100 of FIG. 1.

1 and 2, the cryogenic refrigeration system 10 of the present invention may include a cryogenic freezer 100 and a heat dissipation module 200. The cryogenic freezer 100 may be cooled to cryogenic temperatures. The heat dissipation module 200 may dissipate the cryogenic freezer 100.

The cryogenic freezer 100 may include a sterling cryogenic freezer. According to one example, the cryogenic freezer 100 may include a power generator 110, a power converter 120, and a gas cooling unit 130.

The power generation unit 110 may generate rotational power by an external power source. For example, the power generation unit 110 may include a motor. The power generator 110 may be connected to the power converter 120. The power generation unit 110 may be heated to a temperature higher than room temperature. The power generation unit 110 may be heated to about 30 ° C or more.

The power converter 120 may convert rotational power into reciprocating linear power. The power converter 120 may include a shaft 122, a cam 124, a plurality of connecting rods 126, and a housing 128. The shaft 122 may be connected to the power generator 110. The cam 124 may be connected between the shaft 122 and the connecting rods 126. The connecting rods 126 may extend to the gas cooling unit 130. Housing 128 may surround cam 124. The housing 128 may be connected to the gas cooling unit 130.

Oil 121 may be provided in housing 128. The oil 121 may be heated by the operation of the shaft 122, the cam 124, and the connecting rods 126.

The gas cooling unit 130 may be disposed on the power conversion unit 120. The gas cooling unit 130 may cool the gas 131 to cryogenic temperatures. The gas 131 may include helium gas. According to an example, the gas cooling unit 130 may include a cylinder 132, a displacer 140, and a piston 150. The cylinder 132 may be connected on the power converter 120. Gas 131 may be provided in cylinder 132. The displacer 140 and the piston 150 may be connected to the connecting rods 126 to move up and down within the cylinder 132. The displacer 140 may be disposed on the piston 150. One of the connecting rods 126 may pass through the piston 150.

The cylinder 132 may include a gas expansion region 134, a gas compression region 136, and a piston movement region 138. Gas expansion zone 134 may be disposed on gas compression zone 136. The displacer 140 may be connected to one of the connecting rods 126 to reciprocate within the gas expansion region 134 and the gas compression region 136. The displacer 140 may expand and cool the gas 131 in the gas expansion region 134. Thus, the gas expansion zone 134 may be a cooling zone. The gas compression region 136 may be connected to the rest of the connecting rods 126 and disposed between the gas expansion region 134 and the piston movement region 138. The piston 150 may move reciprocally in the piston movement region 138. Alternatively, the piston movement region 138 may be a passage region of one of the connecting rods 126. Displacer 140 and piston 150 may compress gas 131 in gas compression region 136. The compressed gas 131 may heat the cylinder 132 of the gas compression region 136. The gas compression zone 136 may be a heating zone.

The heat dissipation module 200 may directly cool the cryogenic refrigerator 100 by circulating a refrigerant to the power generator 110, the power converter 120, and the gas cooling unit 130. Direct cooling has a smaller size than a typical dual radiator and can reduce maintenance costs. Thus, the cryogenic refrigeration system 10 of the present invention can reduce the running cost.

According to an example, the heat dissipation module 200 may include a condenser 210, a compressor 220, heat exchangers 230, a refrigerant expander 240, a refrigerant supply line 250, and a refrigerant recovery line 260. Can be. The condenser 210 may condense the refrigerant. The compressor 220 may be connected to the condenser 210. The compressor 220 may compress the refrigerant. According to one example, the refrigerant may include R22, R123, R134a, HFC-407C, HFC-407A or R-123yf. The refrigerant may have a lower freezing point and vaporization point than water. For example, when heat exchanged about 15 ° C. water to 30 ° C. for a 63K cryogenic freezer 100, the water may have a heat dissipation efficiency (COP) of about 0.2625. On the other hand, when heat exchange of R22 of about -30 ° C to -15 ° C, R22 may have a heat dissipation efficiency of about 0.323. The refrigerant in R22 can increase heat dissipation efficiency over water. The heat exchangers 230 may be connected to the power generator 110, the power converter 120, and the gas cooling unit 130. The refrigerant supply line 250 may be connected between the condenser 210 and the heat exchangers 230. The refrigerant expander 240 may be connected to the refrigerant supply line 250. The refrigerant recovery line 260 may be connected between the compressor 220 and the heat exchangers 230.

The condenser 210 may liquefy the refrigerant. The condenser 210 may include a water cooled condenser or an air cooled condenser.

The refrigerant expander 240 may be disposed between the condenser 210 and the heat exchangers 230. The refrigerant expander 240 may vaporize and cool the refrigerant. The cooled refrigerant may be provided to the heat exchangers 230 via the refrigerant supply line 250. The refrigerant may be heated in the heat exchangers 230.

The compressor 220 may provide the heated refrigerant to the condenser 210 at a constant pressure. The refrigerant may be provided to the condenser 210 in a gas state. The refrigerant may be circulated between the heat exchangers 230 and the condenser 210.

The heat exchangers 230 may cool the power generator 110, the power converter 120, and the gas cooling unit 130. According to one example, heat exchangers 230 may include a gas heat exchanger 232, an oil heat exchanger 234, and a motor heat exchanger 236.

Gas heat exchanger 232 may be disposed in the compression zone 136. The gas heat exchanger 232 may cool the cylinder 132 of the compression zone 136. The heat exchange supply line 233 may connect the gas heat exchanger 232 and the oil heat exchanger 234. The heat exchange recovery line 235 may connect the gas heat exchanger 232 and the motor heat exchanger 236. The refrigerant may be provided sequentially to the oil heat exchanger 234, the gas heat exchanger 232, and the motor heat exchanger 236. A first protective cover 312 may be disposed around the gas heat exchanger 232. The first protective cover 312 can protect the gas heat exchanger 232. In contrast, the first protective cover 312 may prevent dew condensation due to the cooling of the gas heat exchanger 232.

The oil heat exchanger 234 may be disposed in the power converter 120. The oil heat exchanger 234 may cool the oil in the power converter 120. The oil heat exchanger 234 may be connected to the refrigerant supply line 250. A second protective cover 314 may be disposed around the heat exchanger 234. The second protective cover 314 can protect the oil heat exchanger 234.

The motor heat exchanger 236 may be disposed in the power generator 110. The motor heat exchanger 236 may cool the power generating unit 110. Motor heat exchanger 236 may be connected to refrigerant recovery line 260.

3 shows another example of the cryogenic refrigeration system 10 of FIG. 1.

Referring to FIG. 3, the heat dissipation module 200 may include a first pressure transducer 272, a first temperature sensor 274, and a circulating flow controller 276.

The first pressure transducer 272 may be disposed in the refrigerant recovery line 260 between the heat exchangers 230 and the compressor 220. The first pressure transducer 272 may detect the pressure of the refrigerant.

The first temperature sensor 274 may be disposed in the refrigerant recovery line 260 adjacent to the first pressure transducer 272. The first temperature sensor 274 may detect the temperature of the refrigerant.

The circulating flow controller 276 may be connected to the first pressure transducer 272, the first temperature sensor 274, and the refrigerant expander 240. In addition, the circulation flow controller 276 may receive a detection signal of the temperature and the pressure of the first pressure transducer 272 and the first temperature sensor 274. The circulation flow rate of the refrigerant may be controlled based on the temperature and the pressure. The refrigerant expander 240 may adjust the circulation flow rate of the refrigerant according to the control signal of the circulation flow controller 276.

The cryogenic refrigerator 100, the condenser 210 of the heat dissipation module 200, the compressor 220, the heat exchangers 230, the refrigerant expander 240, the refrigerant supply line 250, and the refrigerant recovery line 260 are 1 and 2 may be the same.

4 shows another example of the cryogenic refrigeration system 10 of FIG. 1.

Referring to FIG. 4, the heat dissipation module 200 includes a second temperature sensor 282, a second pressure transducer 284, a bypass valve 286, a bypass controller 288, a bypass line 290, And a sensitive heat tube 292.

The second temperature sensor 282 may be disposed in the refrigerant recovery line 260. The second temperature sensor 282 may detect the temperature of the refrigerant.

The second pressure transducer 284 may be disposed in the refrigerant recovery line 260. The second pressure transducer 284 may detect the pressure of the refrigerant.

Bypass valve 286 may be disposed in refrigerant recovery line 260 between condenser 210 and compressor 220. Bypass valve 286 may be connected to bypass line 290. Bypass valve 286 may include a three-way valve.

Bypass controller 288 may control bypass valve 286. Bypass controller 288 may receive temperature and pressure signals from second temperature sensor 282 and second pressure transducer 284.

The bypass line 290 may bypass the condenser 210 to connect the refrigerant recovery line 260 and the refrigerant supply line 250. According to one example, bypass line 290 may bypass branch 290 at bypass valve 286. Bypass line 290 may be connected to refrigerant supply line 250 between heat exchangers 230 and refrigerant expander 240. For example, the bypass controller 288 bypasses the refrigerant from the refrigerant recovery line 260 to the refrigerant supply line 250 through the bypass line 290 when the temperature of the refrigerant in the refrigerant recovery line 260 is low. You can. Alternatively, if the pressure of the refrigerant in the refrigerant recovery line 260 is high, the bypass controller 288 may divert the refrigerant from the refrigerant recovery line 260 to the refrigerant supply line 250.

The thermostat 292 may be disposed in the refrigerant recovery line 260. The thermostat 292 may be connected to the refrigerant expander 240. The thermostat 292 may detect the temperature of the refrigerant in the refrigerant recovery line 260. The thermostat 292 may control the refrigerant expander 240 according to the temperature of the refrigerant. The thermostat 292 may output a turn on signal and a turn off signal of the refrigerant expander 240. If the temperature of the refrigerant is high, the thermostat 292 may output a turn-on signal. When the temperature of the refrigerant is low, the thermostat 292 may output a turn off signal.

As mentioned above, although embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that it can be. Therefore, it should be understood that the embodiments and the applications described above are exemplary in all respects and not restrictive.

Since the cryogenic freezer according to the embodiment of the present invention can increase the heat radiation efficiency, it is possible to minimize the operating cost. The cryogenic freezer can effectively cool the low temperature superconductor or the high temperature superconductor. Superconductors can be used as source materials for power plants, substations, magnetic resonance devices, magnetic levitation trains and superconductor laboratories. Cryogenic freezers can be widely used in superconductor technology. Furthermore, the cryogenic freezer may be mounted in a metal cryogenic metal tensile test apparatus.

Claims

Cryogenic freezer; And

Including a heat dissipation module for cooling the cryogenic freezer,

The heat dissipation module is:

A condenser disposed spaced apart from the cryogenic freezer and condensing a refrigerant for cooling the cryogenic freezer; And

And a heat exchanger coupled to the cryogenic freezer and circulating the refrigerant between the cryogenic freezer and the condenser to cool the cryogenic freezer.
The method of claim 1,

The cryogenic freezer includes a gas cooling unit for expanding the gas to cool the gas,

And the heat exchanger comprises a first heat exchanger for cooling the gas cooling section.
The method of claim 2,

The gas cooling section is:

A cylinder including an expansion zone for expanding the gas and a compression zone below the expansion zone;

A displacer disposed within the cylinder and moved between the expansion zone and the compression zone; And

A piston disposed below said displacer, said piston being moved in said compression zone,

And the first heat exchanger is disposed in the compression zone.
The method of claim 3, wherein

The cryogenic freezer further includes a power generating unit for generating power provided to the displacer and the piston,

And the heat exchanger further comprises a second heat exchanger for cooling the power generating section.
The method of claim 4, wherein

The cryogenic refrigerator further includes a power conversion unit disposed below the cylinder and converting the power generated by the power generation unit.

And the heat exchanger further comprises a third heat exchanger for cooling the power conversion section.
The method of claim 5,

The heat dissipation module is:

A heat exchange recovery line connecting the first heat exchanger and the second heat exchanger; And

And a heat exchange supply line connecting said first heat exchanger to said third heat exchanger.
The method of claim 5,

The heat dissipation module is:

A refrigerant recovery line connected between the second heat exchanger and the condenser to recover the refrigerant; And

And a refrigerant supply line connected between the third heat exchanger and the condenser to supply the refrigerant.
The method of claim 7, wherein

A compressor disposed in the refrigerant recovery line to compress the refrigerant; And

And an expander disposed in the refrigerant supply line to expand the refrigerant.
The method of claim 8,

The heat dissipation module is:

A first pressure transducer disposed in the refrigerant recovery line between the compressor and the second heat exchanger to sense a pressure of the refrigerant;

A first temperature sensor disposed in the refrigerant recovery line adjacent to the first pressure transducer to sense a temperature of the refrigerant; And

The cryogenic refrigeration system further comprises a circulating flow rate controller for receiving the pressure sense signal and the temperature sense signal of the first pressure transducer and the first temperature sensor to control the expander.
The method of claim 8,

The heat dissipation module is:

A bypass valve disposed in the refrigerant recovery line between the compressor and the condenser; And

And a bypass line branched from the bypass valve and bypassing the condenser and connected to the refrigerant supply line between the expander and the third heat exchanger.
The method of claim 10,

The heat dissipation module is:

A second pressure transducer disposed in the refrigerant recovery line between the compressor and the second heat exchanger to sense a pressure of the refrigerant;

A second temperature sensor disposed in the refrigerant recovery line adjacent to the second pressure transducer to sense a temperature of the refrigerant; And

And a bypass controller configured to control the bypass valve by receiving a pressure sensing signal and a temperature sensing signal of the second pressure transducer and the second temperature sensor.
The method of claim 10,

The heat dissipation module is:

And a thermostat disposed on the refrigerant recovery line between the compressor and the second heat exchanger and sensing a temperature of the refrigerant and outputting turn-on and turn-off signals of the expander.
A cryogenic freezer comprising a power generation unit, a power conversion unit for converting the power generated by the power generation unit, and a gas cooling unit for cooling the gas with the power converted by the power conversion unit; And

And a heat dissipation module configured to circulate the refrigerant for cooling the cryogenic refrigerator to the power generation unit, the power conversion unit, and the gas cooling unit.
The method of claim 13,

The heat dissipation module is:

A condenser to condense the refrigerant; And

And a heat exchanger for providing the refrigerant condensed in the condenser to the power generation unit, the power conversion unit, and the gas cooling unit.
The method of claim 14,

The heat dissipation module is:

A refrigerant recovery line for recovering the refrigerant between the condenser and the heat exchanger; And

And a refrigerant recovery line for supplying said refrigerant between said condenser and said heat exchanger.
The method of claim 15,

The heat exchanger is:

A first heat exchanger for cooling the gas cooling unit;

A second heat exchanger for cooling the power generation section; And

And a third heat exchanger for cooling said power converter.
The method of claim 16,

The heat dissipation module is:

A heat exchange refrigerant recovery line for recovering the refrigerant between the first heat exchanger and the second heat exchanger; And

And a heat exchange refrigerant supply line for supplying the refrigerant between the first heat exchanger and the third heat exchanger.
The method of claim 16,

The gas cooling unit includes a cylinder having an expansion region for expanding the gas and a compression region for compressing the gas,

And the first heat exchanger is disposed in the compression zone.
The method of claim 15,

The heat dissipation module is:

A compressor disposed in the refrigerant recovery line to compress the refrigerant;

A pressure transducer disposed between the compressor and the heat exchanger and configured to sense a pressure of the refrigerant;

An expander disposed in the refrigerant supply line to expand the refrigerant; And

And a circulating flow controller for receiving the pressure sensing signal of the pressure transducer to control the inflator.
The method of claim 15,

The heat dissipation module is:

A bypass valve disposed in the refrigerant recovery line; And

And a bypass line connected to the bypass valve and bypassing the condenser and connected to the refrigerant supply line.