KR102042353B1 - Refrigerator - Google Patents

Abstract

Disclosed is a refrigerator. According to an embodiment of the present invention, the refrigerator comprises: a compressor discharging a gas-phased refrigerant; a condenser cooling the refrigerant discharged from the compressor to liquefy the refrigerant; an expansion device expanding the refrigerant liquefied in the condenser; and an evaporator cooling a predetermined space as the expanded refrigerant flows into the evaporator to be vaporized while sucking heat and guiding the refrigerant to the compressor. The evaporator can comprise: a first heat exchange pipe guiding the refrigerant containing gas to the expansion device after re-liquefaction of the refrigerant when guiding the refrigerant discharged from the condenser to the expansion device; and a second heat exchange pipe guiding the liquefied refrigerant passing through the expansion device to the compressor after gasifying the liquefied refrigerant.

Description

Freezer {REFRIGERATOR}

The following embodiments relate to a refrigerator, and more particularly, to a refrigerator that lowers the temperature of the refrigerator at low cost through reliquefaction of the refrigerant.

The refrigerator refers to a device that reduces the temperature of one side by taking heat from one side and transferring it to the other side.

1 is a view schematically showing the structure of a conventional single stage compressor.

Referring to FIG. 1, a conventional single stage compression refrigerator may include a compressor 11, a condenser 12, an expansion device 13, and an evaporator 14, and may further include a receiver according to an embodiment. .

The compressor 11 compresses the low temperature low pressure gas refrigerant provided by the evaporator 14 to the high temperature and high pressure, and delivers the high temperature gas pressure refrigerant compressed by the compressor 11 to the outside air or water. Condensed to be a liquid refrigerant by the heat exchange action of the transfer to the receiver, the receiver temporarily stores the liquid refrigerant condensed at high temperature and high pressure in the condenser 12. The expansion device 13 rapidly expands the high temperature and high pressure liquid refrigerant supplied from the receiver to transfer the low temperature low pressure refrigerant to the evaporator, and the evaporator delivers the low temperature low pressure refrigerant supplied from the expansion device 13 to the outside air and water. The heat is taken away by the heat exchange action with the heat exchange medium to evaporate to generate a low temperature low pressure gas refrigerant, and then transfer to the compressor (11).

In the conventional single stage compressed refrigerator, one compressor 11 is used, and the temperature of the evaporator is about -20 ° C. Binary freezers can be used to achieve lower temperatures than single stage compressors.

2 is a view schematically showing the structure of a conventional binary refrigerator.

Referring to FIG. 2, the conventional binary refrigerator may be configured in a combination of two refrigeration cycles including a high temperature unit 10, which is a high temperature single stage compression refrigeration cycle, and a low temperature unit 20, which is a low temperature refrigeration cycle. Here, the high temperature section 10 or the low temperature section 20, which is a single stage compression refrigeration cycle, may include the structure of the single stage compression refrigerator described with reference to FIG.

Conventional binary refrigerators may be composed of two compressors (11, 21), more specifically, two compressors (11, 21) may be composed of a first compressor (11) and a second compressor (21), high temperature unit 10 and the low temperature portion 20 may be provided respectively. The evaporator 14 of the high temperature unit 10 may be operated as the condenser 22 of the low temperature unit 20. At this time, the evaporator 14 of the high temperature section 10 and the condenser 22 of the low temperature section 20 may be referred to as a heat exchanger (30).

In the conventional binary refrigerator, the freezer compartment obtains a low temperature of about -50 ° C, and the temperature of the evaporator 14 at this time is about -55 ° C.

R134a, R22, or the like may be applied to the coolant on the high temperature part 10 side, and the coolant on the low temperature part 20 side may be used to R23, R508A, R508B, or the like. Here, the boiling point of R134a is -29.6 ° C at atmospheric pressure, the boiling point of R23 is -82 ° C, and the boiling point of R508A is -87 ° C.

Referring to the operation of the conventional dual compression refrigerator in more detail, first, the high temperature section 10 is liquefied (6) while the high-pressure R134a refrigerant (7) exiting the first compressor (11) is cooled by the atmosphere, the first expansion After expansion (5) using the device (13) it is about -15 ~ -20 ℃, evaporated in the heat exchanger 30 (evaporator 14 function) (6) can be introduced into the first compressor (11) have.

In addition, the low-temperature unit 20 is completely liquefied by exchanging the high-pressure R23 refrigerant 3 leaving the second compressor 21 with the R134a refrigerant of the high-temperature unit 10 -15 ° C in a heat exchanger (condenser 22 function). After being expanded, it is expanded (1) and enters the evaporator 24 at a temperature of about -55 ° C, sucks in heat, and provides a low temperature while vaporizing to cool the freezing space to about -50 ° C and to the second compressor 21. Inflow (2). Here, the refrigerant liquefied 4 may be expanded 1 through the heat exchanger 30 through the second expansion device 23.

This dual refrigerator is expensive because two compressors are applied, but is a refrigeration system that wants to obtain a lower temperature than a single stage compressor using one compressor. Accordingly, there is a need for a binary freezer capable of lowering the temperature at the lowest possible cost.

Korean Patent No. 10-1649193 relates to such a dual refrigeration cycle system, and describes a technique related to a dual refrigeration cycle system capable of effectively performing cryogenic cooling.

Korean Patent Registration No. 10-1649193

Embodiments provide a freezer that can provide a lower temperature freezing space using an evaporator, expansion tank or liquefier.

In addition, embodiments use a mixed refrigerant to lower the temperature of the evaporator to provide a lower temperature freezing space, in the case of a low boiling mixture refrigerant to re-liquefy using an evaporator, expansion tank or liquefaction, thereby reducing the freezing efficiency To provide a high freezer.

In one embodiment, a refrigerator includes: a compressor configured to discharge a refrigerant in a gas state; A condenser for cooling and liquefying the refrigerant discharged from the compressor; An expansion device for expanding the refrigerant liquefied in the condenser; And an evaporator which cools a predetermined space as the expanded refrigerant flows in, inhales heat, and vaporizes, and guides the refrigerant to the compressor. Here, the evaporator is a first heat exchange pipe for guiding the refrigerant from the condenser to the expansion device, after liquefying the refrigerant containing gas to the expansion device; And a second heat exchange pipe for vaporizing the liquefied refrigerant passing through the expansion device and guiding the compressor to the compressor.

When guiding the refrigerant from the condenser to the expansion device, the refrigerant containing gas not liquefied in the condenser may be guided to the evaporator and then guided to the expansion device. Here, the refrigerant may be made of a mixed refrigerant in which at least two refrigerants of different boiling points are mixed.

According to another embodiment, a binary refrigerator includes: a first compressor configured to discharge a first refrigerant in a gaseous state; A condenser for cooling and liquefying the first refrigerant discharged from the first compressor; A first expansion device for expanding the first refrigerant liquefied in the condenser; A heat exchanger to which the expanded first refrigerant is introduced to suck in heat and vaporize, and guide the first refrigerant to the compressor; A second compressor for discharging a second refrigerant in a gas state; A second expansion device for cooling and liquefying the second refrigerant discharged from the second compressor through the heat exchanger, and then expanding the liquefied second refrigerant; And an evaporator configured to cool the predetermined space as the expanded second refrigerant is introduced, sucks heat, and vaporizes, and guides the second refrigerant to the second compressor. The evaporator may include: a first heat exchange pipe configured to guide the second refrigerant from the heat exchanger to the second expansion device after reliquefying the second refrigerant containing gas to guide the second expansion device; And a second heat exchange pipe for vaporizing the liquefied second refrigerant passing through the second expansion device and guiding the second refrigerant to the second compressor.

The heat exchanger may include: an evaporator configured to receive the expanded first refrigerant, suck heat, and vaporize the first refrigerant, and guide the first refrigerant to the compressor; And a condenser of a heat exchanger configured to cool and liquefy the second refrigerant discharged from the second compressor by heat exchange with the first refrigerant of the evaporator.

When the second refrigerant from the condenser is guided to the second expansion device, the second refrigerant containing gas not liquefied in the heat exchanger may be guided to the evaporator and then guided to the second expansion device. .

The second refrigerant may be a mixed refrigerant in which at least two refrigerants of different boiling points are mixed.

An expansion tank for reliquefying the second refrigerant containing gas when the second refrigerant from the heat exchanger is guided to the second expansion device using at least a portion of the second refrigerant in a gas state discharged from the evaporator. It may further include.

When guiding the second refrigerant from the heat exchanger to the second expansion device, it may further include a liquefier for re-liquefying the second refrigerant containing gas. Here, the liquefier may branch the flow of the second refrigerant expanded by the second expansion device to the evaporator to provide cold energy for reliquefying the second refrigerant containing gas. .

According to the embodiments it can be provided a refrigerator that can provide a lower temperature freezing space using an evaporator, expansion tank or liquefier.

In addition, according to embodiments, the refrigerant temperature is lowered to provide a freezing space by lowering the temperature of the evaporator, and the low boiling point refrigerant is reliquefied using an evaporator, an expansion tank, or a liquefier, thereby freezing at low cost. High efficiency refrigerator can be provided.

In addition, as a method for obtaining a lower temperature in the case of the single stage compressed refrigerator according to the embodiments, it is possible to obtain a low temperature even if a dual freezer is not configured. At this time, the lower the boiling point of the mixed refrigerant can lower the temperature of the evaporator.

1 is a view schematically showing the structure of a conventional single stage compressor.
2 is a view schematically showing the structure of a conventional binary refrigerator.
3 is a view schematically showing the structure of a single stage compression refrigerator according to an embodiment.
4 is a view schematically showing the structure of a binary refrigerator according to another embodiment.
5 is a view schematically showing the structure of a binary refrigerator including an expansion tank according to another embodiment.
6 is a view schematically showing the structure of a binary refrigerator including a liquefier according to another embodiment.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings. However, the described embodiments may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. In addition, various embodiments are provided to more fully describe the present invention to those skilled in the art. Shape and size of the elements in the drawings may be exaggerated for more clear description.

3 is a view schematically showing the structure of a single stage compression refrigerator according to an embodiment. Here, FIG. 3A shows the structure of the single stage compressed refrigerator having the second pipe B, and FIG. 3B shows the structure of the single stage compressed refrigerator having the first pipe A and the second pipe B. As shown in FIG.

Referring to FIGS. 3A and 3, the single stage compressed refrigerator according to one embodiment may include a compressor 210, a condenser 220, an expansion device 230, and an evaporator 240.

The compressor 210 may discharge a refrigerant in a gas state, the condenser 220 cools and liquefies the refrigerant discharged from the compressor 210, and the expansion device 230 expands the refrigerant liquefied in the condenser 220. The evaporator 240 may cool the predetermined space as the expanded refrigerant is introduced, sucks heat and vaporizes, and guides the refrigerant to the compressor 210.

At this time, the refrigerant containing the gas not liquefied in the condenser 220 is guided to the evaporator 240 through the second pipe (B) to liquefy, the liquefied refrigerant in the expansion device 230 is expanded and evaporator again Guided to 240 may be vaporized.

As shown in FIG. 3B, for example, when guiding the refrigerant from the condenser 220 to the expansion device 230, the pipe is branched so that the first pipe A expands the liquefied refrigerant in the condenser 220. In operation 230, the second pipe B may guide the refrigerant including the gas not liquefied from the condenser 220 to the evaporator 240.

The evaporator 240 may include a first heat exchange pipe 241 and a second heat exchange pipe 242.

When the first heat exchange pipe 241 guides the refrigerant from the condenser 220 to the expansion device 230, the first heat exchange pipe 241 may re-liquefy the refrigerant containing gas to guide the expansion device 230. In addition, when the second heat exchange pipe 242 guides the refrigerant from the condenser 220 to the expansion device 230, the second heat exchange pipe 242 may vaporize the liquefied refrigerant passing through the expansion device 230 and then guide the refrigerant to the compressor 210. have.

The refrigerant may be R134a, R22, R23, R508A, R508B, or the like. In addition, the refrigerant may be made of a mixed refrigerant in which at least two refrigerants of different boiling points are mixed.

In the case of a conventional single-stage compressed refrigerator using one compressor, a low temperature of about -15 to -20 ° C is obtained, whereas in the case of a binary refrigerator, two expensive compressors are applied to obtain a lower temperature of about -50 ° C. Refrigeration system. This requires a process that can lower the temperature at the lowest possible cost. Below it can provide a binary freezer that can lower the temperature of the evaporator than conventional binary freezer.

First, the low boiling point of the non-liquefied refrigerant in the high-pressure mixed refrigerant can be liquefied by using a low temperature of the gas of about -55 ° C exiting the evaporator. This can be achieved through an additional evaporator or expansion tank configured in the form of a heat exchanger 300.

In addition, when the mixing amount of the refrigerant having a low boiling point is large, it is possible to liquefy by passing the liquid mixture refrigerant not liquefied into the evaporator of about -50 ℃. At this time, the heat exchange pipe may be installed inside the evaporator. It will be described in more detail below.

4 is a view schematically showing the structure of a binary refrigerator according to another embodiment. 4A shows the structure of the binary refrigerator having the second pipe B, and FIG. 4B shows the structure of the binary refrigerator having the first pipe A and the second pipe B. As shown in FIG.

4A and 4B, the binary refrigerator has a first compressor 110, a condenser 120, a first expansion device 130, a heat exchanger 300, a second compressor 210, and a second expansion device ( 230 and evaporator 240. It is also possible to further include a receiver according to the embodiment. Here, the binary refrigerator may be configured in a combination of two refrigeration cycles including a high temperature unit 100 which is a high temperature single stage compression refrigeration cycle and a low temperature unit 200 which is a low temperature freezing cycle. Here, the high temperature unit 100 or the low temperature unit 200, which is a single stage compression refrigeration cycle, may include the structure of the single stage compression freezer described with reference to FIG. 4.

The high temperature unit 100 is composed of a cycle including the first compressor 110, the condenser 120, the first expansion device 130 and the heat exchanger 300, wherein the heat exchanger 300 is to act as an evaporator. Can be. In addition, the low temperature unit 200 may include a second compressor 210, a heat exchanger 300, a second expansion device 230, and an evaporator 240, wherein the heat exchanger 300 serves as a condenser. can do.

The first compressor 110 sucks the refrigerant as a working fluid, compresses the refrigerant, and discharges the compressed refrigerant. The first compressor 110 may discharge the first refrigerant in a gas state.

The condenser 120 may cool and liquefy the first refrigerant by condensing the first refrigerant discharged from the first compressor 110.

The first expansion device 130 may lower the pressure by expanding the first refrigerant liquefied in the condenser 120. Here, the first expansion device 130 may be formed of an expansion valve.

In the heat exchanger 300, the expanded first refrigerant is introduced to suck heat and vaporize, and guide the first refrigerant to the compressor. This means that the heat exchanger 300 serves as an evaporator in the high temperature unit 100 described above.

In addition, the heat exchanger 300 may liquefy the second refrigerant discharged from the two compressors through the heat exchanger 300. This means that the heat exchanger 300 serves as a condenser in the low temperature unit 200 described above.

In other words, the heat exchanger 300 may include an evaporator 140 of the heat exchanger 300 and a condenser 220 of the heat exchanger 300, wherein the evaporator 140 of the heat exchanger 300 may be expanded. The first refrigerant is introduced to suck heat and vaporize, and the first refrigerant may be guided to the compressor, and the condenser 220 of the heat exchanger 300 may convert the second refrigerant discharged from the second compressor 210 into a heat exchanger ( The evaporator 140 of 300 may be cooled and liquefied by heat exchange with the first refrigerant.

The second compressor 210 sucks the refrigerant as a working fluid, compresses the refrigerant, and discharges the compressed refrigerant. The second compressor 210 may discharge the second refrigerant in a gas state.

The second expansion device 230 may cool the second refrigerant discharged from the second compressor 210 through the heat exchanger 300 to liquefy and expand the liquefied second refrigerant to lower the pressure. Here, the second expansion device 230 may be formed of an expansion valve.

The evaporator 240 may cool the predetermined space as the expanded second refrigerant is introduced, sucks heat, and vaporizes, and guides the second refrigerant to the second compressor 210.

Here, the evaporator 240 may include a first heat exchange pipe 241 and a second heat exchange pipe 242, the first heat exchange pipe 241 second expansion of the second refrigerant from the heat exchanger 300. Upon guiding to the device 230, the second refrigerant containing gas is liquefied and then guided to the second expansion device 230, and the second heat exchange pipe 242 is liquefied through the second expansion device 230. The second refrigerant may be vaporized and then guided to the second compressor 210. As such, the second refrigerant containing gas may be reliquefied by installing the first heat exchange pipe 241 and the second heat exchange pipe 242 in the evaporator 240.

The second refrigerant, which is a refrigerant on the low temperature part 200 side, may be formed of a mixed refrigerant in which at least two refrigerants of different boiling points are mixed. For example, it is possible to lower the temperature of the evaporator 240 on the low temperature part 200 side by mixing another refrigerant having a low or high boiling point, such as R23 (-82 ° C.) or R508A, which is a typical circulating refrigerant of the cycle on the low temperature part 200 side. have.

Here, typical mixable refrigerants having a low boiling point are R14, R1150, R170, R116 and the like. The boiling point of R14 is -128.1 占 폚, the boiling point of R1150 is -109.4 占 폚, and the boiling point of R170 is -88.9 占 폚. The number of the refrigerants that can be mixed can be used by mixing two or more thereof.

On the other hand, in the case of a mixed refrigerant in which the refrigerant having a low boiling point is mixed, it may remain as a refrigerant including gas without being liquefied in the heat exchanger 300 or the condenser.

Accordingly, as shown in FIG. 4B, when guiding the second refrigerant from the condenser 120 to the second expansion device 230, the pipe is branched so that the first pipe A is the condenser of the heat exchanger 300. The second refrigerant liquefied at 220 guides the second expansion device 230, and the second pipe B receives the second refrigerant containing the gas not liquefied at the condenser 220 of the heat exchanger 300. Guide to evaporator 240.

In other words, a low boiling point mixed refrigerant additionally mixed with a refrigerant such as R23 is not liquefied in the heat exchanger 300, and thus a process of liquefying it is required.

For example, to liquefy the mixed refrigerant having a low boiling point, the non-condensed high-pressure mixed refrigerant may be passed into the evaporator 240 (low temperature evaporator) to expand after liquefaction to obtain a lower temperature.

As another example, the high pressure mixed refrigerant may be liquefied by using a low temperature of -50 ° C gas from the evaporator 240 (low temperature evaporator) to liquefy the low boiling boiling mixture. This will be described below with reference to FIG. 5.

Accordingly, the refrigerant having a low boiling point can be smoothly condensed and expanded to provide a lower temperature in the evaporator 240.

On the other hand, the first refrigerant, which is a refrigerant on the high-temperature part 100 side, may be made of one refrigerant, but may be made of a mixed refrigerant in which at least two or more refrigerants of different boiling points are mixed according to an embodiment. In this case, the first refrigerant and the second refrigerant may be made of different refrigerants (or mixed refrigerants).

5 is a view schematically showing the structure of a binary refrigerator including an expansion tank according to another embodiment. 5A shows a structure of a binary refrigerator including an expansion tank having a second pipe (B), and FIG. 5B shows a structure of a binary refrigerator including an expansion tank having a first pipe (A) and a second pipe (B). The structure is shown.

5A and 5B, the binary refrigerator including the expansion tank 250 includes a first compressor 110, a condenser 120, a first expansion device 130, a heat exchanger 300, and a second compressor ( 210, a second expansion device 230, an evaporator 240, and an expansion tank 250 may be included. It is also possible to further include a receiver according to the embodiment. The binary refrigerator including the expansion tank may further include the expansion tank 250 in the binary refrigerator described with reference to FIG. 4, and a redundant description thereof will be omitted and briefly described with reference to the expansion tank 250.

The expansion tank 250 uses at least a portion of the gaseous second refrigerant discharged from the evaporator 240 to guide the second refrigerant from the heat exchanger 300 to the second expansion device 230. The second refrigerant can be liquefied.

That is, the high-pressure mixed refrigerant may be liquefied by using a low temperature of -50 ° C gas exiting the evaporator 240 to liquefy the mixed refrigerant having a low boiling point.

6 is a view schematically showing the structure of a binary refrigerator including a liquefier according to another embodiment.

Referring to FIG. 6, in a method of condensing unliquefied gas having a low evaporation temperature among mixed refrigerants, a separate heat exchanger may be used without using the expansion tank 250 or the evaporator 240 including the heat exchange pipe. 300) to liquefy. Here, the separate heat exchanger 300 may be a liquefier 260.

In other words, the binary refrigerator including the liquefier includes the first compressor 110, the condenser 120, the first expansion device 130, the heat exchanger 300, the second compressor 210, and the second expansion device 230. , An evaporator 240 and a liquefier 260 may be included. It is also possible to further include a receiver according to the embodiment. The binary freezer including such a liquefier will be briefly described mainly on the difference, overlapping with the configuration of the binary freezer described in FIGS. 4 and 5. For example, a first compressor 110, a condenser 120, a first expansion device 130, a heat exchanger 300, a second compressor 210, and a second expansion device 230 of a binary refrigerator including a liquefier. ) Is the first compressor 110, the condenser 120, the first expansion device 130, the heat exchanger 300, the second compressor 210 and the second expansion device of the binary refrigerator described in FIGS. 230) or may be identically configured.

When the liquefier 260 guides the second refrigerant from the heat exchanger 300 to the second expansion device 230, the liquefier 260 may reliquefy the second refrigerant including gas. More specifically, the liquefier 260 branches the flow of the second refrigerant expanded by the second expansion device 230 to the evaporator 240, the cold energy for reliquefying the second refrigerant containing gas Can be provided.

That is, the refrigerant having different boiling points may be mixed on the cycle side of the low temperature unit 200 to lower the temperature of the evaporator 240. The same applies to the cycle side of the high temperature portion 100.

Meanwhile, the expansion part 250 may be hypothesized in a cycle on the low temperature part 200 side. The expansion unit 250 functions to absorb and safely absorb gas pressure because all of the low temperature refrigerant inside the cycle is present in a gas state when the refrigerator is not operated.

Hereinafter, the operation of the binary refrigerator described with reference to FIGS. 4 to 6 will be described as an example. At this time, the refrigerant and the temperature used are described as an example to assist the operation and its effects, but are not limited thereto.

First, in the high temperature unit 100, the first compressor 110 is liquefied while the high pressure R134a refrigerant is discharged and cooled by the atmosphere in the condenser 120, and after the refrigerant is expanded through the first expansion device 130, 15 to 20 ° C. may be evaporated from the evaporator 140 of the heat exchanger 300 and introduced into the first compressor 110.

For example, when a small amount of refrigerant having a low boiling point is mixed in the mixed refrigerant used in the low temperature unit 200, in the low temperature unit 200, the second compressor 210 may use a high pressure mixed refrigerant (eg, a mixture of R23 and R14). The high pressure R23 (the boiling point of the atmospheric pressure: -82 ° C) may be liquefied by the low temperature R134a of about -15 ° C of the high temperature part 100 in the condenser 220 of the heat exchanger 300. At this time, the heat exchanger 300 may perform a condenser function because the mixed refrigerant of the low temperature unit 200 is liquefied by heat exchange with the refrigerant of the high temperature unit 100.

The mixed refrigerant such as liquefied R23 and R14 having a low boiling point gas flows into the expansion tank 250 deformed in the form of a heat exchanger 300 and is discharged from the evaporator 240 by the cold air of -50 ° C. Can be liquefied.

When all of the mixed refrigerant is liquefied, the process may flow to the first pipe A and go to the second expansion device 230. This may be a refrigerant temperature of −75 ° C. to −80 ° C. or less in which the pressure is lowered in the second expansion device 230 so that the temperature is further lowered by 10 ° C. or more. Accordingly, the temperature of the freezing space of the evaporator 240 is lowered to -70 ℃ or less. Here, as the boiling point of the mixed refrigerant is lower, the temperature of the freezing space of the evaporator 240 may be lowered.

As another example, a case where a large amount of refrigerant having a low boiling point is mixed in the mixed refrigerant used in the low temperature unit 200 will be described. When a large amount of refrigerant, such as R23 in the liquid state and R14 in the low-boiling gas state, is contained in the heat exchanger 300 of the low temperature unit 200, -50 flows into the expansion tank 250 and is discharged from the evaporator 240. Part of R14 or the like may be liquefied by cold air at 占 폚.

The mixed refrigerant in which the gas is mixed flows into the second pipe B, and thus all of the remaining refrigerant gas R14 and the like may be liquefied by the temperature of the evaporator 240 at -60 to -70 ° C. The liquefied mixed refrigerant may be a refrigerant temperature of −80 ° C. at which the pressure is lowered in the second expansion device 230 and the temperature is further lowered.

On the other hand, in the case of liquefying the mixed refrigerant mixed with a small amount of the refrigerant having a low boiling point can be used to configure the existing expansion unit in the form of a heat exchanger 300 without any additional device, but a low boiling point refrigerant to liquefy the mixed refrigerant mixed with a large amount In this case, it is possible to liquefy by installing a heat exchange pipe inside the evaporator 240.

In addition, in order to condense gas having a low boiling point from the mixed refrigerant passing through the heat exchanger 300 serving as a condenser, the temperature after the expansion device without using the expansion tank 250 or the evaporator 240 including the heat exchange pipe − A portion of the flow of the low temperature mixed refrigerant at 70 ° C. or less may be branched to provide cold energy to the liquefier 260.

According to embodiments, the temperature of the freezing space having a lower temperature, which is the purpose of the binary refrigerator, may be achieved, and the lower the boiling point of the mixed refrigerant may reduce the temperature of the evaporator 240. On the other hand, the binary refrigerator may increase the freezer capacity by the amount of liquefaction energy for condensation of the low boiling gas refrigerant flowing into the evaporator 240.

In other words, while the amount of the refrigerant having a low boiling point is larger, the binary chiller may have a large decrease in temperature, and thus an increase in the capacity of the refrigerator may be required. However, this is not a problem because the purpose of the dual chiller is to obtain a lower temperature.

As described above, according to embodiments, the mixed refrigerant is used to lower the temperature of the evaporator to provide a lower temperature freezing space, and in the case of the low boiling point mixed refrigerant, the liquid is re-liquefied using an evaporator, an expansion tank, or a liquefier, thereby lowering the cost. It is possible to provide a refrigerator that provides a lower temperature freezing space.

When a component is referred to as "connected" or "connected" to another component, the component may be directly connected to or connected to the other component, but another component may be present in the middle. It should be understood that. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “… unit”, “… module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

In addition, the components of the embodiments described with reference to the drawings are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of the technical spirit of the present invention. Even if the description is omitted, it is obvious that a plurality of embodiments may be reimplemented into one integrated embodiment.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same or related reference numerals and redundant description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (7)

delete delete A first compressor for discharging a first refrigerant in a gas state;
A condenser for cooling and liquefying the first refrigerant discharged from the first compressor;
A first expansion device for expanding the first refrigerant liquefied in the condenser;
A heat exchanger in which the expanded first refrigerant is introduced to suck in heat and vaporize, and guide the first refrigerant to the first compressor;
A second compressor for discharging a second refrigerant in a gas state;
A second expansion device for cooling and liquefying the second refrigerant discharged from the second compressor through the heat exchanger, and then expanding the liquefied second refrigerant; And
As the expanded second refrigerant is introduced to suck heat and vaporize, the evaporator cools a predetermined space and guides the second refrigerant to the second compressor.
Including,
The evaporator,
A first heat exchange pipe for guiding the second refrigerant from the heat exchanger to the second expansion device after liquefying the second refrigerant containing gas to the second expansion device; And
A second heat exchange pipe configured to vaporize the liquefied second refrigerant passing through the second expansion device and to guide the second compressor to the second compressor;
Including;
The heat exchanger,
An evaporator configured to introduce the expanded first refrigerant to suck heat and vaporize the first refrigerant, and to guide the first refrigerant to the compressor; And
A condenser of the heat exchanger for cooling and liquefying the second refrigerant discharged from the second compressor by heat exchange with the first refrigerant of the evaporator.
Including,
When guiding the second refrigerant from the condenser of the heat exchanger to the second expansion device, a pipe is branched so that the first pipe A receives the second refrigerant liquefied in the condenser of the heat exchanger of the heat exchanger. Guides to a second expansion device, and the second pipe (B) guides and liquefies the second refrigerant containing gas not liquefied in the condenser of the heat exchanger of the heat exchanger to the evaporator, and then the second expansion device. Guiding to the second expansion device, the second refrigerant liquefied in the second expansion device is expanded and guided back to the evaporator
Characterized in that, binary freezer. delete The method of claim 3,
The second refrigerant is,
Consisting of a mixed refrigerant in which at least two refrigerants of different boiling points are mixed
Characterized in that, binary freezer. The method of claim 3,
An expansion tank for reliquefying the second refrigerant containing gas when the second refrigerant from the heat exchanger is guided to the second expansion device using at least a portion of the second refrigerant in a gas state discharged from the evaporator.
Further comprising, a binary freezer. The method of claim 3,
A liquefier for liquefying the second refrigerant containing gas when guiding the second refrigerant from the heat exchanger to the second expansion device
More,
The liquefier,
Branching the flow of the second refrigerant expanded by the second expansion device into the evaporator to provide cold energy for reliquefying the second refrigerant containing gas;
Characterized in that, binary freezer.

Images