KR20160005936A - Refrigerating system and, refrigerating and freezing combine air conditioning system comprising the same - Google Patents

Abstract

The present invention relates to a cooling system and a cooling and freezing hybrid air conditioning system including an inner cooling compartment wherein products are stored and displayed; multiple outer cooling compartments connected to the inner cooling compartment by a coolant pipe; and a control unit selectively or simultaneously operating the multiple outer cooling compartments. The present invention provides the cooling system and the cooling and freezing hybrid air conditioning system characterized by a fact that the outer cooling compartment includes a backflow preventing check valve installed in a coolant discharging pipe through which a coolant is discharged from the outer cooling compartment to the inner cooling compartment.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system and a refrigeration system,

The present invention relates to a refrigeration system in which a plurality of refrigerating and outdoor units are connected in parallel, and a refrigeration and refrigeration combined air conditioning system including the same.

Generally, the refrigeration cycle apparatus is a device for maintaining the internal temperature of a refrigeration system such as a refrigerator and a showcase at a low temperature by using a refrigeration cycle including a compressor, a condenser, an inflator and an evaporator.

The refrigeration system may include a refrigerator compartment for storing and displaying goods, and a refrigerated outdoor unit connected to the refrigerating compartment and the refrigerant pipe.

The refrigeration system may be configured by connecting one refrigerator compartment and one refrigerator compartment outdoor unit, but may be configured by a combination of a plurality of refrigerating room compartments and a refrigerating outdoor unit.

In the refrigerator compartment, a storage room for storing or displaying foods is formed. Compared with the air conditioning cycle, the refrigerating cycle has a low evaporation temperature and requires a continuous operation for a year.

Therefore, when one cold storage outdoor unit is connected to the refrigerating room, it is difficult to control the refrigerating outdoor unit according to the load of the cold storage room, resulting in unnecessary power consumption due to inefficient operation.

When a plurality of refrigerating outdoor units are connected to the refrigerating compartment, only a part of the refrigerating compartment outdoor units are driven, the efficiency of the refrigerating cycle is lowered due to the reverse flow of the refrigerant to the non-driven refrigerating outdoor unit, .

The present invention provides a refrigeration system capable of efficiently driving a refrigerating and outdoor unit according to a load of a refrigerator compartment.

Another object of the present invention is to provide a refrigeration system capable of securing safety and reducing power consumption.

Another object of the present invention is to prevent refrigerant from flowing into a cold outdoor unit in a non-operating state in a refrigeration system having a plurality of refrigerating and outdoor units.

It is another object of the present invention to provide a refrigeration and refrigeration combined air conditioning system capable of improving condensation and evaporation efficiency of a refrigerant.

Another object of the present invention is to prevent refrigerant from being introduced into a refrigerating outdoor unit or a refrigerating outdoor unit in a non-driven state in a refrigerating and refrigeration combined air conditioning system having a plurality of refrigerating outdoor units or refrigerating outdoor units.

It is another object of the present invention to provide a refrigeration and refrigeration combined air conditioning system capable of securing safety and reducing power consumption.

According to an aspect of the present invention, there is provided a refrigerator comprising: a refrigerator compartment for storing and displaying a product; A plurality of refrigerating and outdoor units connected to the refrigerating compartment through a refrigerant pipe; And a control unit controlling the plurality of refrigerating outdoor units to be simultaneously driven or selectively driven, wherein each refrigerating outdoor unit includes: a check valve installed in a refrigerant discharge pipe through which refrigerant is discharged from the refrigerating outdoor unit to the refrigerating compartment; And a refrigeration system for refrigerating the refrigerator.

The check valve is installed downstream of the outdoor heat exchanger of the refrigerating outdoor unit.

At this time, the check valve is installed at the end of the refrigerant discharge pipe located in the refrigerant outdoor unit in the refrigerant discharge pipe extending from the refrigerated outdoor unit to the refrigerant compartment.

The plurality of cold storage outdoor units are connected in parallel, and the controller controls the cold storage indoor unit to operate simultaneously or selectively according to an operation load of the cold storage room.

In this case, the operation load of the refrigerating compartment is a driving number of the refrigerating compartment, and the driving of the refrigerating compartment can be controlled according to the set temperature.

According to another aspect of the present invention, there is provided an air conditioning system comprising: an air conditioning unit including an air conditioning compressor, an outdoor heat exchanger, and an indoor heat exchanger in which refrigerant is circulated for air conditioning; A refrigerator including a compressor in which a refrigerant for refrigerating is circulated, an outdoor heat exchanger, an expansion device, a plurality of refrigerating outdoor units including an indoor heat exchanger, and a refrigerating compartment; And a freezing part including a compressor in which a refrigerant for freezing is circulated, an outdoor heat exchanger, an expansion device, a plurality of freezer outdoor units including an indoor heat exchanger, and a freezer compartment.

The refrigerating and outdoor air conditioning system may further include a preheat exchanging unit for exchanging heat between the refrigerant in the air conditioning unit and the refrigerant in the refrigerating unit. The refrigerating outdoor unit includes a refrigerant discharging unit for discharging refrigerant from the refrigerating outdoor unit to the refrigerating compartment And a backflow prevention check valve installed in the piping.

The check valve may be provided at a rear end of the outdoor heat exchanger of the refrigerating outdoor unit, and may be installed at a refrigerant discharge pipe extending from the refrigerating outdoor unit to the indoor unit of the refrigerating room, .

The refrigerating and outdoor unit may include a check valve installed in a refrigerant discharge pipe through which the refrigerant is discharged from the refrigerating and outdoor unit to the freezing chamber.

At this time, the check valve for backflow prevention may be installed at the rear end of the outdoor heat exchanger of the freezer outdoor unit.

Meanwhile, the refrigerating and cooling combined air conditioning system may include a controller for controlling the refrigerating outdoor unit or the refrigerating outdoor unit to operate simultaneously or selectively in accordance with the operation load of the refrigerating compartment or the freezing compartment.

At this time, the operation load of the refrigerator compartment or the freezer compartment may be the driving number of the refrigerator outdoor unit or the refrigerating outdoor unit.

As described above, according to the refrigeration system according to one embodiment of the present invention, it is possible to provide a refrigeration system that can efficiently drive the refrigerating and outdoor unit according to the load of the refrigerator compartment.

According to the refrigeration system related to one embodiment of the present invention, it is possible to provide a refrigeration system that secures safety and can reduce power consumption.

According to the refrigeration system related to an embodiment of the present invention, a refrigerating system that prevents refrigerant from flowing into a refrigerating outdoor unit in a non-driving state in a refrigeration system having a plurality of refrigerating outdoor units, .

According to the refrigeration system related to one embodiment of the present invention, since a mechanical valve is provided to prevent refrigerant backflow in a refrigerating system in which a plurality of refrigerating outdoor units are connected in parallel, a refrigerating system with low cost and high reliability can be provided .

According to the refrigeration system related to one embodiment of the present invention, a plurality of modularized refrigerating and outdoor units are connected to the refrigerating compartment, thereby providing a refrigeration system with good installation and expandability.

According to the refrigeration system related to one embodiment of the present invention, it is possible to provide a refrigeration and refrigeration combined air conditioning system capable of improving condensation and evaporation efficiency of refrigerant.

According to the refrigeration system related to one embodiment of the present invention, refrigerant is prevented from flowing into a refrigerating outdoor unit or a refrigerating outdoor unit in a non-operating state in a refrigerating and refrigerated combined air conditioning system having a plurality of refrigerating outdoor units or refrigerating outdoor units, It is possible to provide a refrigeration and refrigeration combined air conditioning system that can prevent the refrigerant and the refrigerant from being reduced.

According to the refrigeration system related to one embodiment of the present invention, it is possible to provide a refrigeration and refrigeration combined air conditioning system that secures safety and reduces power consumption.

FIG. 1 is a configuration diagram illustrating a simultaneous driving of a plurality of refrigerating outdoor units of a refrigeration system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating the selective driving of any of the refrigerating outdoor units of the plurality of refrigerating outdoor units of the refrigeration system according to the embodiment of the present invention.
3 is a configuration diagram illustrating a flow of refrigerant in the heating and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention.
FIG. 4 is a configuration diagram illustrating the flow of refrigerant in the cooling and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention.

Hereinafter, a refrigeration system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings illustrate exemplary embodiments of the present invention and are provided to explain the present invention in detail.

In addition, regardless of the reference numeral, the same or corresponding components may have the same reference number

And redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown may be exaggerated or reduced.

On the other hand, although terms including an ordinal number such as a first or a second may be used to describe various elements, the elements are not limited by the terms, For example.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, components for preventing refrigerant backflow in a refrigeration system having a plurality of refrigerating and outdoor units related to the present invention will be described in detail with reference to the accompanying drawings. Each element mentioned below should be understood with reference to the above description and drawings.

Hereinafter, a refrigeration system according to an embodiment of the present invention will be described in detail with reference to FIG. 1 to FIG.

1 is a configuration diagram illustrating simultaneous driving of a plurality of refrigerating outdoor units of a refrigeration system according to an embodiment of the present invention. 2 is a configuration diagram illustrating selective driving of any one of the plurality of refrigerating outdoor units of the refrigeration system according to the embodiment of the present invention.

The refrigeration system 10 of the present invention may include a refrigerator compartment 20 for storing and displaying goods and a plurality of refrigerating and outdoor units 30 and 40 connected to the refrigerator compartment 20 and a refrigerant pipe.

1 and 2 show a configuration in which the first refrigerator outdoor unit 30 and the second refrigerator outdoor unit 40 are connected to the refrigerator compartment 20 but this is merely an example, It is natural that an outdoor unit can be connected.

1 and 2 show a refrigeration system in which one refrigerating compartment 20 and a plurality of refrigerating outdoor units 30 and 40 are connected by refrigerant piping, a plurality of refrigerating compartments and a plurality of refrigerating outdoor units are connected to a refrigerant pipe They may be connected in parallel.

Meanwhile, a plurality of refrigerating outdoor units (30, 40) in the refrigeration system (10) of the present invention can be connected in parallel to the refrigerating compartment unit (20).

The refrigeration system 10 may include a first refrigerating outdoor unit 30 and a second refrigerating outdoor unit 40 connected to the refrigerating compartment 20 and the refrigerating compartment 20 through a refrigerant pipe.

Specifically, the refrigeration system 10 includes first and second compressors 31 and 41 for compressing refrigerant, first and second outdoor heat exchangers 32 and 42 for exchanging heat between outdoor air and refrigerant, And an indoor heat exchanger (22) for exchanging heat between the refrigerant and the air circulating through the refrigerating compartment (20).

That is, the first refrigerator outdoor unit 30 may include a first compressor 31, a first outdoor heat exchanger 32, and a second fan 33.

When a combined system in which not only a refrigeration system but also a refrigeration system and an air conditioning system are connected to the rear end of the first outdoor heat exchanger 32, a first preheat exchange unit 34 is provided in which refrigerant heat exchange can be performed between the respective systems .

A first receiver (receiver) 35 may be provided at a rear end of the first preheat exchanger 34 in a pipe connecting the first outdoor heat exchanger 32 and the indoor heat exchanger 22. The first receiver 35 is formed of a pressure vessel for storing refrigerant. When the amount of refrigerant is large in the refrigeration cycle, the first receiver 35 may store surplus refrigerant and separate the gaseous refrigerant and the liquid refrigerant from the stored refrigerant.

A second compressor 41, a second outdoor heat exchanger 42, a third blower fan 43, a second preheating exchanger 44 and a second receiver 45 are provided in the second refrigerator outdoor unit 40 .

On the other hand, the refrigerating compartment 20 may be provided with an expansion device 21, an indoor heat exchanger 22, and a first blowing fan 23.

The refrigerator compartment 20 can be, for example, a showcase in which items to be sold in various stores are stored safely in a refrigerated or frozen state for a long period of time, but are easily displayed for consumers.

Such a showcase can be provided for the purpose of storing, selling, and selling articles requiring refrigeration or freeze storage in a mart, a supermarket or the like at an appropriate temperature.

The refrigerator compartment 20 such as a showcase is a device for storing or displaying foods. Compared with the air-conditioning cycle, the refrigerating cycle has a low evaporation temperature and requires a continuous operation for a year.

Then, the refrigerating compartment 20 can be controlled in accordance with the set temperature of the refrigerating compartment 20 in advance.

That is, the refrigerator compartment 20 repeats the driving or non-driving state to reach the preset temperature, and the load of the refrigeration system 10 is changed according to the driving time and the driving period of the refrigerating compartment 20 .

That is, in the season when the outdoor air temperature is high, the driving time for the refrigerating compartment 20 to reach the set temperature becomes longer and the driving period becomes shorter, so that the load of the refrigerating compartment 20 can be increased.

In the season when the outside air temperature is low, the driving time for the refrigerating compartment compartment 20 to reach the set temperature is shortened, and the driving period is long, so that the load of the refrigerating compartment compartment 20 can be reduced.

When the refrigerating system is driven only by a refrigerating outdoor unit having a compressor of a large capacity, operation according to the load of the refrigerating compartment can not be performed.

Therefore, the refrigeration system 10 of the present invention includes a plurality of refrigerating outdoor units 30 and 40, and controls the number of driving units among the plurality of refrigerating outdoor units 30 and 40 according to the load of the refrigerating room unit 20, Can be reduced.

For this purpose, the refrigeration system 10 may include a controller 50 for controlling the number of driven refrigerators to increase or decrease according to the load of the refrigerating compartment 20.

The control unit 50 of the present invention can control the first refrigerator outdoor unit 30 and the second refrigerator outdoor unit 40 to operate independently or simultaneously.

That is, the controller 50 can independently drive the first refrigerating outdoor unit 30 or the second refrigerating outdoor unit 40 according to the load of the refrigerating compartment 20, and the first refrigerator outdoor unit 30, And the second refrigerator outdoor unit 40 may be simultaneously driven.

2, when the second refrigerating outdoor unit 40 is driven alone, the refrigerant may flow back to the first refrigerating outdoor unit 30 in a non-driving state.

When the refrigerant flows into the first refrigerating outdoor unit (30) in the non-driving state, the refrigerant flows into the pipe of the first refrigerating outdoor unit (30) in the non-driving state and the shortage of refrigerant May occur.

In addition, this may cause a reduction in the efficiency of the refrigeration cycle. In addition, there may be a problem that the inside temperature of the refrigerating compartment 20 can not be increased or the set temperature can not be reached due to a decrease in the refrigerating capacity.

In order to prevent this, the refrigerating outdoor units 30 and 40 of the present invention are installed in refrigerant discharge pipes 50a and 50b in which the refrigerant is discharged from the refrigerating outdoor units 30 and 40 to the refrigerating compartment 20, Backflow check valves 36, 46 that guide the one-way flow.

More specifically, the first refrigerant inlet pipe 60a branched from the refrigerant inlet pipe 60 into which the refrigerant flows into the first refrigerating outdoor unit 30 and the second refrigerant outdoor unit 40, (60b) may be connected to the first compressor (31) and the second compressor (41), respectively.

That is, the refrigerant discharged from the refrigerating compartment 20 flows into the first compressor 31 and the second compressor 41. At this time, the first compressor 31 and the second compressor 41 are supplied with the refrigerant of the non- A shutoff valve may be provided to prevent entry.

Therefore, refrigerant can be prevented from flowing into the compressor of the first compressor (31) and the second compressor (41) in the non-driven state. Further, since the internal pressure of the shells of the compressors 31 and 41 is higher than the refrigerant pressure of the refrigerant inflow pipe 60 through which the refrigerant discharged from the refrigerating compartment 20 flows, the inflow of the refrigerant into the compressors 31 and 41 Can be prevented.

The first outdoor heat exchanger 32 and the second outdoor heat exchanger 42 which are the discharge side of the first refrigerating outdoor unit 30 and the second refrigerating outdoor unit 40 are connected to the first refrigerant discharge pipe 50a, And the second refrigerant discharge pipe 50b, respectively.

The first refrigerant discharge pipe 50a and the second refrigerant discharge pipe 50b extending from the first refrigerating outdoor unit 30 and the second refrigerating outdoor unit 40 connected in parallel are connected to the refrigerant outdoor units 30 and 40 So that refrigerant can be supplied to the refrigerating compartment 20.

At this time, the refrigerant can flow back from the refrigerant discharge piping 50 connected to the refrigerating outdoor unit in the first refrigerating outdoor unit 30 and the second refrigerating outdoor unit 40 in the non-operated state.

Accordingly, the check valves 36 and 46 may be installed in the refrigerant discharge pipes 50a and 50b at the rear ends of the outdoor heat exchangers 32 and 42 of the refrigerating and outdoor units 30 and 40, respectively.

At this time, the check valves 36, 46 may be installed at the ends of the refrigerant discharge pipes 50a, 50b formed in the refrigerating outdoor units 30, 40.

The check valves 36 and 46 are connected to the refrigerant discharge pipes 50a and 50b connected to the inside of the refrigerating and outdoor units 30 and 40 in the refrigerant discharge pipe 50 which is connected to the outside of the refrigerating and outdoor units 30 and 40 connected in parallel. ) To prevent the refrigerant from flowing backward.

Accordingly, the check valves 36 and 46 are installed in the refrigerating and outdoor units 30 and 40 so as to shorten the interval in which the refrigerant stagnates in the refrigerant discharge pipes 50a and 50b extending outward from the refrigerating and outdoor units 30 and 40, 30b, 40c, 40c, 40d, 40d, 40d, 40d, 40d, 40d, 40d, 40d, 40d.

The refrigeration system 10 of the present invention can connect a plurality of modular refrigerating and outdoor units 30 and 40 to the refrigerating compartment 20 in parallel. That is, the refrigerating and outdoor units 30 and 40 can be modularized so that the number of refrigerating and outdoor units 30 and 40 connected to the refrigerating compartment 20 can be easily added or reduced.

Therefore, it is preferable that the check valves 36 and 46 are located inside the refrigerated outdoor units 30 and 40. In this case, as described above, it is most preferable that the check valves 36 and 46 are installed at the ends of the refrigerant discharge pipes 50a and 50b formed in the refrigerating outdoor units 30 and 40.

That is, according to an embodiment of the present invention, a plurality of modularized refrigerated outdoor units can be easily added to the refrigerating compartment and can be easily shrunk, thereby providing a refrigeration system with good installation and expandability.

Hereinafter, the refrigerant flow of the refrigeration system 10 of the present invention will be described with reference to FIGS. 1 and 2. FIG.

The control unit 50 of the refrigeration system 10 of the present invention can simultaneously drive the plurality of refrigerating outdoor units 30 and 40 or selectively drive the refrigerating outdoor unit among the plurality of refrigerating outdoor units 30 and 40 depending on the load .

The refrigerant discharged from the refrigerator compartment 20 during the simultaneous operation of the plurality of refrigerating outdoor units 30 and 40 is supplied to the plurality of compressors (not shown) of the plurality of refrigerating outdoor units 30 and 40 through the divided refrigerant inlet pipes 60a and 60b 31 and 41 to be compressed and then introduced into the plurality of outdoor heat exchangers 32 and 42 and condensed and then discharged to the outside of the refrigerating outdoor units 30 and 40 through the refrigerant discharge pipes 50a and 50b.

The check valves 36 and 46 provided at the ends of the refrigerant discharge pipes 50a and 50b in the refrigerating and outdoor units 30 and 40 receive refrigerant from the plurality of outdoor heat exchangers 32 and 42, 20 does not block the flow of the refrigerant in the direction of the refrigerant flowing into the refrigerant.

On the other hand, the refrigerant discharged from the refrigerating compartment 20 during the selective operation of any of the refrigerating outdoor units of the plurality of refrigerating outdoor units 30 and 40 flows through the branched refrigerating inlet pipes 60a and 60b to the refrigerating outdoor units 30 , 40) to a plurality of compressors (31, 41). At this time, the refrigerant does not flow into the compressor of the refrigerated outdoor unit in the non-driven state by the refrigerant inflow-blocking valve provided in the plurality of compressors (31, 41).

The check valves 36 and 46 provided at the ends of the refrigerant discharge pipes 50a and 50b in the refrigerating and outdoor units 30 and 40 are discharged from the refrigerated outdoor unit in the driving state and are discharged to the refrigerant discharge pipe 50 And blocks the flow of the refrigerant flowing back to the discharge end of the branched refrigerated outdoor unit in the non-driven state.

In other words, the check valve (36, 46) of the present invention is a mechanical valve for guiding the refrigerant to flow in only one direction, and it is possible to switch the driving of a plurality of refrigerating outdoor units (30, 40) .

The refrigerating system 10 of the present invention is equipped with the mechanical backflow prevention check valves 36 and 46 so that it is possible to prevent refrigerant backflow with a low cost and high reliability.

There is also an effect that the refrigerant can be prevented from being stagnated in the refrigerating outdoor units (30, 40) in the non-driving state. As a result, the efficiency of the refrigeration system can be prevented from being reduced, and a reliable refrigeration system with high reliability can be provided.

Hereinafter, the refrigerant backflow prevention of a plurality of refrigerating outdoor units of the refrigeration and refrigeration combined air conditioning system according to an embodiment of the present invention will be described in detail with reference to FIG. 3 to FIG.

3 is a configuration diagram illustrating a flow of refrigerant in the heating and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention. FIG. 4 is a configuration diagram illustrating the flow of refrigerant in the cooling and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention.

The refrigeration and refrigeration combined air conditioning system 100 according to an embodiment of the present invention may include an air conditioning unit 200, a refrigerating unit 300, and a freezing unit 400. The air conditioning unit 200 may cool or heat the indoor space, and the refrigerator 300 and the freezer 400 may provide cold air for refrigeration or freezing of food.

The air conditioning unit 200 may include an air conditioning outdoor unit 202 connected to the air conditioning indoor unit 201 and the air conditioning indoor unit 201 and the refrigerant pipe, respectively.

Specifically, the air conditioning unit 200 may include an air conditioning compressor 210, an air conditioning outdoor heat exchanger 220, an air conditioning indoor heat exchanger 230, and a first expansion device 241.

In the air conditioning outdoor heat exchanger (220), heat exchange is performed between the refrigerant and the outdoor air, and heat exchange between the refrigerant and the indoor air can be performed in the air conditioning indoor heat exchanger (230).

The air conditioner outdoor heat exchanger 220 and the air conditioner indoor heat exchanger 230 may serve as condensers and evaporators in the cooling mode and evaporators and condensers respectively in the heating mode.

The air conditioning unit 200 may include first and second ventilation fans 221 and 231 for air conditioning. The first and second air blowing fans 221 and 231 for air conditioning respectively flow outdoor air or indoor air that is heat-exchanged with a refrigerant flowing through the air conditioning outdoor heat exchanger 220 and the air conditioning indoor heat exchanger 230 .

The air conditioning unit 200 may include a four-way valve 250. The four-way valve 250 compresses the refrigerant compressed in the air conditioning compressor 210 according to the cooling or heating mode of the air conditioning unit 200 to the air conditioning outdoor heat exchanger 220 or the air conditioning indoor heat exchanger 230 ). ≪ / RTI >

In more detail, when the air conditioning unit 200 is in the cooling mode, the four-way valve 250 is switched so that the refrigerant compressed by the air conditioning compressor 210 is guided to the air conditioning outdoor heat exchanger 220, The refrigerant compressed by the air conditioning compressor 210 may be switched to be guided to the air conditioning indoor heat exchanger 230.

The air conditioning unit 200 may include first to fourth expansion devices 241, 242, 243, and 244. The air conditioning unit first expansion device 241 is installed in a refrigerant pipe connecting the air conditioning outdoor heat exchanger 220 and the air conditioning indoor heat exchanger 230 and is installed adjacent to the air conditioning outdoor heat exchanger 220 . The second to fourth expansion devices 242, 243 and 244 are connected to the first to third preheat exchanging parts 610, 620 and 630 for exchanging heat with the refrigerant pipe of the refrigerating part 300 and the refrigerating part 400 The amount of the refrigerant introduced into the first to third preheat exchanging units 610, 620, and 630 can be adjusted.

The refrigerator 300 may include a refrigerator compartment 301 for storing and displaying goods and a plurality of refrigerating and outdoor units 302a and 302b connected to the refrigerating compartment 301 and a refrigerant pipe.

3 to 4 show a refrigerator 300 in which one refrigerating compartment 301 and a plurality of refrigerating outdoor units 302a and 302b are connected by refrigerant piping. However, the refrigerating compartment 300 includes a plurality of refrigerating compartments 301, (302a, 302b) may be connected to the refrigerant pipe, respectively.

Meanwhile, the plurality of refrigerating and outdoor units 302a and 302b in the refrigerating unit 300 of the present invention may be connected to the refrigerating compartment 301 in parallel.

The refrigerating unit 300 may include a first refrigerating outdoor unit 302a and a second refrigerating outdoor unit 302b connected to the refrigerating compartment 301 and the refrigerating compartment 301 and the refrigerant pipe.

Specifically, the refrigerator 300 includes first and second compressors 310a and 310b for compressing refrigerant, first and second refrigerant heat exchangers 320a and 320b for exchanging heat between the outdoor air and the refrigerant, A fifth expansion device 341 and a refrigerating indoor heat exchanger 330 for exchanging heat between air circulating through the refrigerating compartment 301 and the refrigerant.

That is, the first refrigerating outdoor unit 302a may be provided with a first refrigerating compressor 310a, a first refrigerating outdoor heat exchanger 320a, and a third blowing fan 321a. The first preheat exchanging unit 610 is provided at a rear end of the refrigerating first outdoor heat exchanger 320a and is provided with a first preheating exchange unit 610 through which refrigerant can be exchanged with the air conditioning unit 200, The first receiver 350a may be provided at the rear end of the first receiver 350a.

The second refrigerator outdoor unit 302b is provided with a second compressor for refrigeration 310b, a second outdoor heat exchanger 320b for refrigeration, a fourth fan 321b, a second preheat exchanger 620, and a second receiver 350b may be provided.

Meanwhile, a fifth expansion device 341, a refrigerating indoor heat exchanger 330, and a fifth blowing fan 331 may be installed in the refrigerating compartment 301.

For example, the refrigerator compartment 301 may be a showcase in which products to be sold in various stores are stored safely in a refrigerated or frozen state for a long period of time, and are easily displayed for consumers. The driving of the refrigerating compartment 301 can be controlled according to the set temperature of the refrigerating compartment 301.

That is, the refrigerator compartment 301 repeats the driving or non-driving condition so as to reach the preset temperature, and the load of the refrigerator 300 is changed according to the driving time and the driving period of the refrigerating compartment 301 .

The combined refrigeration and air-conditioning system 100 may include a control unit 500 for controlling the number of driven outdoor units to increase or decrease according to the load of the refrigerating room unit 301.

The control unit 500 of the present invention can control the first refrigerator outdoor unit 302a and the second refrigerator outdoor unit 302b to operate independently or simultaneously.

That is, the controller 500 can independently drive the first refrigerating outdoor unit 302a or the second refrigerating outdoor unit 302b according to the load of the refrigerating compartment 301, and the first cold storage outdoor unit 302a and the second cold storage unit And the second refrigerator outdoor unit 302b may be simultaneously driven.

Meanwhile, when the first cold storage outdoor unit 302a or the second cold storage outdoor unit 302b is driven alone, the refrigerant can flow back to the refrigerated outdoor unit in the non-driven state.

When the refrigerant flows into the refrigerating outdoor unit in the non-driven state, the refrigerant stagnates in the piping of the refrigerated outdoor unit in the non-driven state, and a shortage of the refrigerant to be introduced into the refrigerating chamber 301 may occur. In addition, this may cause a reduction in the efficiency of the refrigeration cycle. In addition, there may be a problem that the inside temperature of the refrigerating compartment 301 can not be increased or the set temperature can not be reached due to the deterioration of the refrigerating capacity.

In order to prevent this, the refrigerating outdoor units 302a and 302b of the present invention are installed in refrigerant discharge pipes 370a and 370b in which the refrigerant is discharged from the refrigerating outdoor units 302a and 302b to the refrigerating compartment 301, Reverse flow check valves 360a and 360b that form a one-way flow.

More specifically, the first refrigerant inlet pipe 380a branched from the refrigerant inlet pipe 380 into which the refrigerant flows into the first refrigerating outdoor unit 302a and the second refrigerant outdoor unit 302b and the second refrigerant inlet pipe 380b may be connected to the refrigerating first compressor 310a and the refrigerating second compressor 310b, respectively.

That is, the refrigerant discharged from the refrigerating compartment 301 flows into the refrigerating first compressor 310a and the refrigerating second compressor 310b. At this time, the refrigerating first compressor 310a and the refrigerating second The compressor 310b may be provided with a valve for preventing refrigerant from flowing into the compressor 310b.

Therefore, refrigerant can be prevented from flowing into the compressor of the first compressor 310a for refrigeration and the second compressor 310b for refrigeration. Since the shell internal pressure of the refrigerating compressors 310a and 310b is relatively higher than the refrigerant pressure of the refrigerant inflow pipe 380 through which the refrigerant discharged from the refrigerating compartment 301 flows, Can be prevented.

The rear ends of the refrigerating first outdoor heat exchanger 320a and the refrigerating second outdoor heat exchanger 320b, which are the discharge side of the first refrigerating outdoor unit 302a and the second refrigerating outdoor unit 302b, And may be connected to the pipe 380a and the second refrigerant discharge pipe 380b, respectively.

The first refrigerant discharge pipe 380a and the second refrigerant discharge pipe 380b extending from the first refrigerating outdoor unit 302a and the second refrigerating outdoor unit 302b connected in parallel are connected to the refrigerating outdoor units 302a and 302b So that the refrigerant can be supplied to the refrigerating compartment 301.

At this time, the refrigerant can flow back from the refrigerant discharge piping connected to the refrigerating outdoor unit in the non-driven state among the first refrigerating outdoor unit 302a and the second refrigerating outdoor unit 302b.

The refrigerant check valves 360a and 360b may be installed in the refrigerant discharge pipes 370a and 370b at the rear ends of the refrigerating outdoor heat exchangers 320a and 320b of the refrigerating outdoor units 302a and 302b have. The refrigerant check valves 360a and 360b may be installed at the ends of the refrigerant discharge pipes 370a and 370b formed in the refrigerating outdoor units 302a and 302b.

The refrigerant check valves 360a and 360b are connected to a refrigerant discharge pipe 370 connected to the inside of the plurality of refrigerating outdoor units 302a and 302b in a refrigerant discharge pipe 370 that is connected to the outside of the plurality of refrigerating outdoor units 302a and 302b connected in parallel. And serves to prevent the refrigerant from flowing backward to the discharge pipes 370a and 370b.

The refrigerant check valves 360a and 360b are installed in the refrigerator outdoor units 302a and 302b in order to shorten the interval in which the refrigerant is stagnated in the refrigerant discharge pipes 370a and 370b extending outward from the inside of the refrigerated outdoor units 302a and 302b, It is most preferable to be installed at the ends of the refrigerant discharge pipes 370a and 370b formed in the outdoor units 302a and 302b.

In this case, the refrigerant check-back check valves 360a and 360b are mechanical valves that allow the refrigerant to flow in only one direction. In the direction in which the refrigerant is discharged from the refrigerating outdoor units 302a and 302b to the refrigerating compartment 301, It is possible to shut off only the refrigerant flowing backward from the refrigerant discharge pipe 370 to the discharge side of the refrigerating outdoor units 302a and 302b.

Therefore, even if the number of refrigerating outdoor units 302a, 302b is increased in accordance with the load of the refrigerating compartment 301, no additional valve control is required. Also, even if the number of refrigerating outdoor units (302a, 302b) is reduced, it is possible to prevent the refrigerant from flowing backward to the discharge side of the refrigerating outdoor unit in the non-driven state.

That is, the refrigerating and cooling compounded air conditioning system 100 of the present invention includes the mechanical backflow prevention check valves 360a and 360b in the plurality of refrigerating outdoor units 302a and 302b, thereby realizing a reliable and highly reliable refrigerant backflow prevention .

The freezer 400 may include a freezer outdoor unit 402 connected to the freezer compartment 401 and the freezer compartment 401 through a refrigerant pipe.

3 to 4, one freezing compartment 401 and one freezing compartment outdoor unit 402 are connected to each other in the freezing compartment 400. However, the freezing compartment compartment 401 and the freezing compartment outdoor unit 402 may have one or more .

More specifically, the freezing part 400 includes a plurality of freezing compressors 410, a freezing outdoor heat exchanger 420, a freezing indoor heat exchanger 430, a sixth expansion device 441, a third preheat exchange part 630 and a third receiver 460.

The refrigerator compartment 401 may be provided with a sixth expansion device 441, a refrigerating indoor heat exchanger 430 and a seventh blower fan 431. The freezer compartment 401 may be a freezer for storing food such as fish or meat by subcooling.

The refrigeration outdoor unit 402 is provided with first and second compressors 410a and 410b for refrigeration, a refrigerant outdoor heat exchanger 420, a sixth blower fan 421, a third preheat exchanger 630, A fourth expansion device 460, a seventh expansion device 442, and a subcooler 470 may be provided.

The refrigerating compressor (410) compresses the refrigerant. The evaporating temperature of the refrigerating indoor heat exchanger (430) is lower than that of the indoor heat exchanger (330) for heating or refrigeration, A compressor is required. The refrigeration compressor 410 of the present invention shown in FIGS. 3 to 4 shows a multi-stage refrigeration multi-stage compressor 410a, 410b connected in series to increase the compression time, but the present invention is not limited thereto.

Also, a three-way valve 450 is provided between the refrigerant multi-stage compressors 410a and 410b connected in series, and the refrigeration compressor 410 can be selectively driven according to the load of the freezing unit 400. [

In the refrigerating outdoor heat exchanger (420) provided at the rear end of the refrigerating compressor (410), the refrigerant compressed by the refrigerating compressor (410) can be condensed through heat exchange with outdoor air. The refrigerating indoor heat exchanger (430) can evaporate the refrigerant condensed in the refrigerating outdoor heat exchanger (420) through heat exchange with indoor air.

The refrigerating unit 400 is provided with a sixth blowing fan 421 for increasing the heat exchange efficiency with the outdoor air and a seventh blowing fan 422 for the refrigerating indoor heat exchanger 430, 431) are provided to exchange heat with the indoor air to provide cold air, thereby freezing the food.

The refrigerating outdoor heat exchanger (420) may further include a supercooler (470) for supercooling refrigerant that has passed through the refrigerating outdoor heat exchanger (420) at a rear end of the refrigerating outdoor heat exchanger (420). The subcooler 470 may be provided for the purpose of supplying supercooled condensed refrigerant, which performs heat exchange with the room air, in the freezing indoor heat exchanger 430 to the freezing compartment 401.

When a plurality of refrigerating outdoor units 402 of the freezing unit 400 are connected to each other, the number of driving units can be controlled according to the load of the freezing compartment unit 401 of the freezing unit 400.

At this time, in order to prevent the refrigerant flowing from the driven outdoor unit 402 to the freezer compartment 401 to flow back to the discharge side of the refrigerated outdoor unit 402 in the non-driven state, A check valve 480 for preventing backflow of the freezing portion may be provided at the rear end of the unit 420.

At this time, the freezer reverse check valve 480 may be provided at the rear end of the subcooler 470 at the end of the refrigerant discharge pipe 490 of the freezer outdoor unit 402.

The freezer reverse check valve 480 may be provided on the discharge side of the freezer outdoor unit 402. At this time, the refrigerant check-back check valve 480 is a mechanical valve that allows the refrigerant to flow in only one direction, and does not block the refrigerant in the direction in which the refrigerant is discharged from the refrigerating outdoor unit 402 to the freezer compartment 401, Only the refrigerant flowing backward from the refrigerant discharge pipe 490 to the discharge side of the refrigerating outdoor unit 402 can be blocked.

Therefore, even if the number of the refrigerating outdoor units 402 is increased according to the load of the freezing compartment unit 401, no additional valve control is required. Further, even if the number of the refrigerating and outdoor units 402 is reduced, it is possible to prevent the refrigerant from flowing back to the discharge side of the refrigerating outdoor unit 402 in the non-driven state. Therefore, it is possible to more reliably change the refrigerant flow depending on whether the refrigerating outdoor unit 402 is driven or not.

In the refrigeration and refrigeration combined air conditioning system 100 of the present invention, a preheating exchange unit 600 is provided between the air conditioning unit 200 and the refrigerating unit 300, and between the air conditioning unit 200 and the freezing unit 400 .

The preheat exchanger 600 relatively has a coefficient of performance (COP) for increasing the efficiency of the air conditioner 200, the refrigerating unit 300, and the freezing unit 400, The refrigerating unit 300 or the freezing unit 400 can recover condensation heat from the air conditioning unit 200 having a relatively high COP.

The preheat exchanging part 600 of the present invention includes a first preheating exchanging part 610 and a second preheating exchanging part 620 provided between the air conditioning part 200 and the refrigerating part 300, And a third preheating exchange unit 630 provided between the freezing unit 400 and the freezing unit 400.

A first preheating exchange unit 610 is disposed at a rear end of the first outdoor refrigerant heat exchanger 320a and a second preheat exchanging unit 610 is disposed between the air conditioning unit 200 and the refrigerating unit 300, And the second preheating exchanging part 620 may be provided at the rear end.

The first preheat exchanging part 610 may perform heat exchange between the refrigerant of the air conditioning part 200 and the refrigerant of the refrigerating part 300. The refrigerant of the air conditioning unit 200 that performs heat exchange in the first preheat exchanging unit 610 may be relatively low in pressure as compared with the refrigerant of the refrigerating unit 300. Therefore, the refrigerant of the air conditioning unit 200 at a relatively low pressure can be evaporated by the heat exchange in the first preheat exchanging unit 610. The refrigerant of the refrigerating unit 300, which is relatively high in pressure, can be condensed by heat exchange in the first preheating exchanging unit 610.

The refrigerant of the refrigerating unit 300 is condensed by the heat exchange in the first preheat exchanging unit 610 so that the refrigerant flowing from the air conditioning unit 200 having a relatively high COP to the refrigerating unit 300 having a relatively low COP Condensation heat recovery can be achieved.

In the second preheat exchanging part 620, the refrigerant of the air conditioning part 200 is evaporated by the heat exchange in the second preheating exchanging part 620 like the first preheating exchanging part 610, 200) to the refrigerator (300) can be recovered.

The third preheat exchanging part 630 may perform heat exchange between the refrigerant of the air conditioning part 200 and the refrigerant of the freezing part 400. The refrigerant of the air conditioning unit 200 that performs heat exchange in the third preheat exchanging unit 630 may be relatively low in pressure as compared with the refrigerant of the freezing unit 400.

Accordingly, the refrigerant of the air conditioning unit 200 at a relatively low pressure can be evaporated by the heat exchange in the third preheating exchanger 630. The refrigerant in the freezing part 400, which is relatively high in pressure, can be condensed by heat exchange in the third preheating exchanging part 630.

The refrigerant of the freezing part 400 is condensed by the heat exchange in the third preheat exchanging part 630 so that the refrigerant of the freezing part 400 relatively low in COP from the air conditioning part 200 having a relatively high COP Condensation heat recovery can be achieved.

As described above, the second to fourth expansion devices 242, 243, and 244 are installed in the refrigerant inflow end of the first to third preheat switching units 630 in the air conditioning unit 200, The amount of the refrigerant flowing into the third preheating exchanging part 630 can be controlled.

Hereinafter, the refrigerant flow in the heating and cooling modes of the air conditioning unit of the refrigeration and refrigeration combined air conditioning system according to the embodiment of the present invention will be described in detail with reference to FIG. 3 to FIG.

3 is a configuration diagram illustrating a flow of refrigerant in the heating and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention.

Referring to FIG. 3, in the air conditioning unit 200, the refrigerant compressed by the air conditioning compressor 210 in the heating mode can be delivered to the air conditioning indoor heat exchanger 230 by the four-way valve 250. The refrigerant delivered to the air conditioning indoor heat exchanger (230) can be heated by the second air blowing fan (231) by heat exchange with the indoor air, condensing, heat exchange and room temperature elevated.

The refrigerant condensed in the air conditioning indoor heat exchanger (230) may be expanded by the first expansion device (241) and transferred to the air conditioning outdoor heat exchanger (220). The refrigerant transferred to the air conditioning outdoor heat exchanger 220 is heat-exchanged with the outdoor air by the first blowing fan 221 and is evaporated and then transferred to the air conditioning compressor 210.

Meanwhile, a part of the refrigerant condensed in the air conditioning indoor heat exchanger (230) flows through the first branch pipe (261) branched from the air conditioning indoor heat exchanger refrigerant discharge pipe (260) And the second preheating exchange unit 620. [

The refrigerant condensed in the air conditioning indoor heat exchanger 230 flows through the first preheat exchanging part 610 and the second preheating exchanging part 620 to the refrigerating first outdoor heat exchanger 320a, The outdoor heat exchanger 320b can be evaporated by heat exchange with the refrigerant condensed in the outdoor heat exchanger 320b.

The refrigerant that has passed through the first preheat exchanging part 610 and the second preheating exchanging part 620 in the air conditioning part 200 and is evaporated is discharged to the outside through the first summing And can be combined with the refrigerant evaporated in the air conditioner outdoor heat exchanger (220) through the branch pipe (271).

That is, by evaporating the refrigerant condensed in the air conditioning indoor heat exchanger (230) through the first preheating exchange part (610) and the second preheating exchange part (620), the refrigerant discharged from the air conditioning indoor heat exchanger The evaporation efficiency of the refrigerant can be improved.

At this time, in the case of the refrigerating unit 300, the refrigerant condensed in the refrigerating first outdoor heat exchanger 320a and the refrigerating second outdoor heat exchanger 320b flows through the first preheat exchanging unit 610 and the second And further condensed through the preheat exchanging part 620 to improve the condensing efficiency.

Meanwhile, the refrigerator 300 may be driven depending on the load of the refrigerating compartment 301 by the first outdoor refrigerating unit 302a and the second outdoor refrigerating unit 302b. Therefore, refrigerant check valves 360a and 360b are provided on the refrigerant discharge pipes of the refrigerating first outdoor heat exchanger 320a and the refrigerating second outdoor heat exchanger 320b of the refrigerating unit 300 It is possible to prevent the discharged refrigerant from flowing backward. The check valves 360a and 360b are the same as those of the check valves 360a and 360b described above.

Meanwhile, a part of the refrigerant condensed in the air conditioning indoor heat exchanger (230) flows through the third preheating exchanger (630) through the second branch pipe (262) branched from the air conditioning indoor heat exchanger refrigerant discharge pipe (260) Lt; / RTI >

The refrigerant condensed in the air conditioning indoor heat exchanger 230 can be evaporated through heat exchange with the refrigerant condensed in the refrigerating outdoor heat exchanger 420 through the third preheating exchanger 630.

The refrigerant that has passed through the third preheat exchanging part 630 in the air conditioning unit 200 and evaporated is discharged through the first joint pipe 271 joined to the refrigerant discharge pipe 270 of the air conditioning outdoor heat exchanger And may be combined with the refrigerant evaporated in the outdoor heat exchanger (220).

That is, by evaporating the refrigerant condensed in the air conditioning indoor heat exchanger (230) through the third preheat exchanging part (630), the evaporation efficiency of the refrigerant discharged from the air conditioning indoor heat exchanger (230) have.

At this time, in the case of the freezing part 400, the refrigerant condensed in the freezing outdoor heat exchanger 420 may be further condensed through the third preheat exchanging part 630 to improve the condensing efficiency.

FIG. 4 is a configuration diagram illustrating the flow of refrigerant in the cooling and refrigeration / freezing modes of the refrigerating and freezing hybrid air conditioning system according to the embodiment of the present invention.

Referring to FIG. 4, in the air conditioning unit 200, the refrigerant compressed by the air conditioning compressor 210 may be transmitted to the air conditioning outdoor heat exchanger 220 by the four-way valve 250 in the cooling mode. The refrigerant transferred to the air conditioning outdoor heat exchanger 220 can be heat-exchanged with the outdoor air by the first blowing fan 221 and condensed.

The refrigerant condensed in the air conditioning outdoor heat exchanger 220 may be expanded and cooled in the first expansion device 241 and then transferred to the air conditioning indoor heat exchanger 230.

The refrigerant delivered to the air conditioning indoor heat exchanger 230 is heat-exchanged with the indoor air by the second air blowing fan 231 and evaporated, and the indoor air is cooled by the refrigerant flowing through the air conditioning indoor heat exchanger 230 So that the cooling can be performed.

The refrigerant evaporated in the air conditioning indoor heat exchanger (230) can be delivered to the air conditioning compressor (210).

A part of the refrigerant condensed in the air conditioning outdoor heat exchanger 220 flows into the first preheat exchanging unit 610 through the first branch pipe 281 branched from the air conditioning outdoor heat exchanger refrigerant discharge pipe 280, And the second preheating exchange unit 620. [

The refrigerant condensed in the air conditioning outdoor heat exchanger 220 flows through the first preheat exchanging part 610 and the second preheating exchanging part 620 to the refrigerating first outdoor heat exchanger 320a, The outdoor heat exchanger 320b can be evaporated by heat exchange with the refrigerant condensed in the outdoor heat exchanger 320b.

The refrigerant that has passed through the first preheat exchanging part 610 and the second preheating exchanging part 620 in the air conditioning part 200 and is evaporated is discharged to the first heat exchanger And can be combined with the refrigerant evaporated in the air conditioning indoor heat exchanger (230) through the branch pipe (291).

That is, the refrigerant condensed in the air conditioner outdoor heat exchanger 220 is evaporated through the first preheat exchanging part 610 and the second preheating exchanging part 620 so that the refrigerant discharged from the air conditioning outdoor heat exchanger 220 is discharged The evaporation efficiency of the refrigerant can be improved.

At this time, in the case of the refrigerating unit 300, the refrigerant condensed in the refrigerating first outdoor heat exchanger 320a and the refrigerating second outdoor heat exchanger 320b flows through the first preheat exchanging unit 610 and the second And further condensed through the preheat exchanging part 620 to improve the condensing efficiency.

A part of the refrigerant condensed in the air conditioning outdoor heat exchanger 220 flows into the third preheating exchanger 630 through the second branch pipe 282 branched from the air conditioning outdoor heat exchanger refrigerant discharge pipe 280, Lt; / RTI >

The refrigerant condensed in the air conditioner outdoor heat exchanger 220 can be evaporated through heat exchange with the refrigerant condensed in the refrigerating outdoor heat exchanger 420 through the third preheat exchanger 630.

The refrigerant which has passed through the third preheat exchanging part 630 in the air conditioning part 200 and evaporated is passed through the second joint pipe 292 joined to the refrigerant discharge pipe 290 for the air conditioning indoor heat exchanger, May be combined with the refrigerant vaporized in the indoor heat exchanger (230).

That is, by evaporating the refrigerant condensed in the air conditioning outdoor heat exchanger 220 through the third preheating exchanger 630, the evaporation efficiency of the refrigerant discharged from the air conditioning outdoor heat exchanger 220 can be improved have.

At this time, in the case of the freezing part 400, the refrigerant condensed in the freezing outdoor heat exchanger 420 may be further condensed through the third preheat exchanging part 630 to improve the condensing efficiency.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, The present invention may be modified in various ways. Therefore, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

10: refrigeration system 20: refrigerated indoor machine
30: first refrigerator outdoor unit 36: first check valve
40: second refrigerator outdoor unit 46: second check valve
50: control unit 100: cold storage refrigeration combined air conditioning system
200: air conditioning unit 300: refrigerator
360a: first reverse check valve of refrigerator part 360b: second reverse check valve of refrigerated part
500: controller 600: preheat exchanger

Claims (15)

A refrigerator compartment containing an expansion device and an indoor heat exchanger;
A plurality of refrigerating and outdoor units connected to the refrigerating compartment and the refrigerant piping and including a compressor and an outdoor heat exchanger; And
And a controller for controlling the plurality of refrigerating outdoor units to be simultaneously or selectively driven,
Wherein each of the refrigerating and outdoor units includes a check valve installed in a refrigerant discharge pipe through which the refrigerant is discharged from the refrigerating and outdoor unit to the refrigerating compartment. The method according to claim 1,
Wherein the check valve is installed downstream of the outdoor heat exchanger of the refrigerating and outdoor unit. 3. The method of claim 2,
Wherein the check valve is installed at an end of a refrigerant discharge pipe located inside the refrigerant outdoor unit in a refrigerant discharge pipe extending from the refrigerant outdoor unit to the refrigerating compartment. The method according to claim 1,
Wherein the plurality of refrigerating outdoor units are connected in parallel. 5. The method of claim 4,
Wherein the controller controls the refrigerating outdoor unit to operate simultaneously or selectively in accordance with an operation load of the refrigerating compartment. 6. The method of claim 5,
Wherein the operation load of the refrigerating compartment is a driving number of the refrigerating compartment in which a plurality of refrigerating compartments are connected in parallel to the refrigerating compartment. The method according to claim 6,
Wherein the driving of the refrigerating compartment is controlled according to a set temperature. The method according to claim 1,
Wherein the compressor of the refrigerating and outdoor unit includes a shut-off valve that can prevent refrigerant from flowing into the compressor. An air conditioning unit in which a refrigerant for air conditioning is circulated and includes an air conditioning compressor, an outdoor heat exchanger, and an indoor heat exchanger;
A refrigerating unit including a refrigerating compartment containing a refrigerant for refrigerating and an indoor heat exchanger, and a plurality of refrigerating outdoor units connected to the refrigerating compartment by a refrigerant pipe and including a compressor and an outdoor heat exchanger;
A freezing part including a freezing compartment containing a refrigerant for freezing, an expansion device and an indoor heat exchanger, and a plurality of refrigerating outdoor units connected to the freezing compartment and a refrigerant pipe and including a compressor and an outdoor heat exchanger; And,
And a preheating exchange unit for performing heat exchange between the refrigerant of the air conditioning unit and the refrigerant of the refrigerating unit and the freezing unit,
Wherein the refrigerating outdoor unit comprises a check valve installed in a refrigerant discharge pipe through which the refrigerant is discharged from the refrigerating outdoor unit to the refrigerating compartment. 10. The method of claim 9,
And the check valve is installed downstream of the outdoor heat exchanger of the refrigerating outdoor unit. 11. The method of claim 10,
Wherein the check valve is installed at an end of a refrigerant discharge pipe located inside the refrigerating outdoor unit in a refrigerant discharge pipe extending from the refrigerating outdoor unit to the refrigerating compartment. 10. The method of claim 9,
Wherein the refrigerating and outdoor unit further comprises a check valve installed in a refrigerant discharge pipe through which the refrigerant is discharged from the freezer outdoor unit to the freezer compartment. 13. The method of claim 12,
And the check valve is installed downstream of the outdoor heat exchanger of the refrigerating outdoor unit. 10. The method of claim 9,
And a controller for simultaneously or selectively operating the plurality of refrigerating outdoor units or the plurality of refrigerating outdoor units according to an operation load of the refrigerator compartment or the freezer compartment. 15. The method of claim 14,
Wherein the operation load of the refrigerator compartment or the freezer compartment is a driving number of the refrigerator outdoor unit or the refrigerating outdoor unit.

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