JP7477431B2 - Refrigeration equipment - Google Patents

Description

This disclosure relates to a refrigeration device.

Patent Document 1 discloses a refrigeration system having a load unit (refrigerator, freezer, showcase, etc.) that stores or displays products such as food and beverages in a refrigerated or frozen state in a store, etc. A low-temperature, low-pressure refrigerant is supplied to the load unit of such a refrigeration system from an outdoor unit, and the refrigerant exchanges heat with air in a heat exchanger inside the load unit to cool the products.
2. Description of the Related Art In the field of refrigeration systems, it is common to connect a plurality of outdoor units in parallel to a load in order to improve the cooling capacity of the refrigeration system.
In the refrigeration system described in Patent Document 1, the outdoor unit has its own receiver inside the casing. When multiple outdoor units are connected in parallel to a load device, the refrigerant supplied from the load device to each outdoor unit is supplied to the compressor via the receiver unique to each outdoor unit.

JP 2018-71909 A

However, in the refrigeration system of Patent Document 1, the refrigerant goes through a process of gas-liquid separation in a unique receiver provided for each outdoor unit, which can result in uneven amounts of refrigerant being supplied to the compressors between the outdoor units.

The present disclosure has been made to solve the above problem, and aims to provide a refrigeration device that can suppress bias in the amount of refrigerant supplied to the compressor among multiple outdoor unit units.

To solve the above problems, the refrigeration device according to the present disclosure includes a first casing, multiple outdoor unit units each having an individual accumulator housed in the first casing, and a compressor housed in the first casing and supplied with refrigeration oil from the individual accumulator, a separate unit having a second casing arranged independently of the first casing and a common receiver housed in the second casing, and refrigerant piping that connects the common receiver and the compressors of the multiple outdoor unit units in parallel and supplies refrigerant from the common receiver to the compressors.

This disclosure provides a refrigeration system that can reduce bias in the amount of refrigerant supplied to the compressor between outdoor unit units.

1 is a schematic diagram illustrating a configuration of a refrigeration device according to an embodiment of the present disclosure. 2 is a diagram showing a refrigerant circuit configuration of an outdoor unit of the refrigeration apparatus. FIG. FIG. 2 is a diagram showing a refrigerant circuit configuration of a separate unit of the refrigeration apparatus. FIG. 13 is a schematic diagram showing a modified example of the configuration of a refrigeration device according to an embodiment of the present disclosure.

(Refrigeration equipment)
FIG. 1 shows the configuration of a refrigeration device 1.
The refrigeration device 1 of the present embodiment includes a plurality of outdoor unit units 2, a separate unit 3, and a load device 4. The refrigeration device 1 of the present embodiment includes two outdoor unit units 2.

(Outdoor unit)
FIG. 2 shows a configuration of a refrigerant circuit of the outdoor unit 2 shown in FIG.
The outdoor unit 2 has a first casing 20, a compressor 21, an individual accumulator 22, an oil separator 23, a gas cooler 25, a first electronic expansion valve 26, and a second electronic expansion valve 29, which are all housed in the first casing 20.
The compressor 21 , the individual accumulator 22 , the oil separator 23 , the gas cooler 25 , the first electronic expansion valve 26 , and the second electronic expansion valve 29 are each connected by the outdoor unit piping 200 .

The outdoor unit piping 200 includes a refrigerant piping 201, a suction pipe 202, a liquid delivery pipe 203, a gas pipe 204, a compressor suction pipe 205, a return pipe 206, a discharge pipe 210, and a bypass pipe 212.

(Separate unit)
FIG. 3 shows a refrigerant circuit configuration of the separate unit 3 shown in FIG.
The separate unit 3 has a second casing 30 , a common receiver 31 , a third electronic expansion valve 34 , a subcooling coil 33 , and a common accumulator 32 , which are all housed in the second casing 30 .
The common receiver 31 , the third electronic expansion valve 34 , the subcooling coil 33 , and the common accumulator 32 are connected to each other by separate unit piping 300 .
The second casing 30 is disposed independently of the first casing 20 .

The separate unit piping 300 has a liquid pipe 303, a subcooling pipe 304, a load side liquid supply pipe 301, and a load side suction pipe 302.

As shown in FIG. 1 , the outdoor units 2 are each connected in parallel to the separate unit 3 via a refrigerant pipe 201 , a suction pipe 202 , and a liquid supply pipe 203 .
The separate unit 3 is connected to the load 4 via a load side liquid supply pipe 301 and a load side suction pipe 302 .

(Load device)
The load device 4 is a refrigeration/freezing device such as a refrigerator, a freezer, or a showcase that cools or refrigerates products and displays them.
The load device 4 has a load device main body 40 , a load device side expansion valve 42 , and a load device side heat exchanger 41 .
The load 4 receives a supply of liquid refrigerant from the separate unit 3 via a load-side liquid supply pipe 301 .

The load body 40 is disposed independently of the first casing 20 and the second casing 30 .
The load side expansion valve 42 is housed in the load main body 40. The load side expansion valve 42 adjusts the flow rate of the liquid refrigerant supplied from the separate unit 3, thereby adjusting the cooling temperature of the product.
The load side heat exchanger 41 is housed in the load main body 40. The load side heat exchanger 41 cools the products by exchanging heat between the liquid refrigerant supplied from the separate unit 3 and the air in the load main body 40. The warmed refrigerant after the heat exchange is sent to the separate unit 3 via the load side suction pipe 302.

The refrigerant circuit configuration of the outdoor unit 2 is explained below with reference to Figure 2.

(Compressor)
Inside each outdoor unit 2, the multiple compressors 21 are provided in parallel to the individual accumulators 22 via compressor suction pipes 205. The multiple compressors 21 are also provided in parallel to the common receiver 31 of the separate unit 3 via refrigerant piping. The outdoor unit 2 of this embodiment includes two compressors 21.

Each compressor 21 is a so-called two-stage compressor of a scoriator type having a first stage compression section 21a and a second stage compression section 22a. The compressor 21 compresses the refrigerant supplied from the individual accumulator 22 and the common receiver 31 of the separately installed unit 3. In this embodiment, the gas refrigerant and refrigeration oil sent from the individual accumulator 22 are supplied to the first stage compression section 21a via the compressor suction pipe 205. In addition, the gas refrigerant sent from the common receiver 31 is supplied to the second stage compression section 22a via the refrigerant piping 201.

The compressor 21 compresses the gas refrigerant supplied from both accumulators 22 in each compression section to generate high-temperature, high-pressure gas refrigerant. The compressor 21 increases the pressure of the gas refrigerant supplied from the individual accumulators 22 to an intermediate pressure in the first stage compression section 21a, and compresses it to the maximum pressure in the second stage compression section 22a. The gas refrigerant and refrigeration oil compressed in the second stage compression section 22a are supplied to the subsequent oil separator 23 via a discharge pipe 210 connected to the discharge side of the compressor 21.
In this embodiment, _CO2 , which has a larger compression ratio than freon and the like, is used as the refrigerant.

(Individual accumulator)
The individual accumulators 22 separate the gas refrigerant and refrigerating machine oil supplied from the common accumulator 32 of the separate unit 3 via the suction pipe 202 into a gas phase and a liquid phase. The individual accumulators 22 supply the separated gas refrigerant to each compressor 21 via the compressor suction pipe 205. At this time, the refrigerating machine oil that has been separated and accumulated in the individual accumulators 22 is mixed again with the gas refrigerant at a predetermined mixing ratio. The gas refrigerant and the refrigerating machine oil are evenly supplied to the first stage compression sections 21a of each compressor 21 via the compressor suction pipes 205, respectively.

(Oil separator)
Each outdoor unit 2 is provided with the same number of oil separators 23 as the compressors 21 , and each oil separator 23 is connected to each compressor 21 via a discharge pipe 210 so as to correspond to the compressor 21 .

The oil separator 23 separates the compressed mist-like refrigeration oil and gas refrigerant supplied from the compressor 21 via the discharge pipe 210 into a gas phase and a liquid phase. The refrigeration oil in the liquid phase after separation is returned to the compressor 21 by a predetermined oil return control. A portion of the separated gas refrigerant is returned again to the individual accumulator 22, and the remainder is sent to the gas cooler 25 via the check valve 27 and the gas pipe 204. The check valve 27 prevents the gas refrigerant from flowing back in the gas pipe 204 from the gas cooler 25 toward the oil separator 23.

(Gas cooler)
The gas cooler 25 is supplied with high-temperature, high-pressure gas refrigerant from the oil separator 23 via a gas pipe 204. The gas cooler 25 exchanges heat between the supplied gas refrigerant and air sent from a blower (not shown) to condense the gas refrigerant. In this embodiment, two gas coolers 25 are provided in parallel to the oil separator 23 via the gas pipes 204. The refrigerant condensed in the gas cooler 25 becomes a gas-liquid two-phase state, and is sent via the liquid sending pipe 203 to the first electronic expansion valve 26 and the second electronic expansion valve 29, which are connected in parallel to the gas cooler 25, respectively.

(First electronic expansion valve)
The first electronic expansion valve 26 expands the refrigerant condensed in the gas cooler 25, changing it into a low-temperature, low-pressure refrigerant. The proportion of gas phase in the refrigerant passing through the first electronic expansion valve 26 becomes high. The refrigerant decompressed and expanded by the first electronic expansion valve 26 at a predetermined opening is sent to the common receiver 31 of the separate unit 3 via the liquid sending pipe 203 while remaining in a gas-liquid two-phase state.

(Second electronic expansion valve)
The liquid supply pipe 203 is provided with second electronic expansion valves 29, the same number as the compressors 21. Each second electronic expansion valve 29 reduces the pressure of the refrigerant condensed in the gas cooler 25 and expands it at a predetermined opening, changing it into a low-temperature, low-pressure refrigerant. The refrigerant reduced in pressure and expanded by the second electronic expansion valve 29 becomes a gas refrigerant. The gas refrigerant after the reduction in pressure and expansion passes through a bypass pipe subsequent to the second electronic expansion valve 29, and then merges with the gas refrigerant supplied from the centralized receiver in the refrigerant pipe 201 subsequent to the bypass pipe. The gas refrigerant merged in the refrigerant pipe 21 is supplied to the second stage compression section 22a of the compressor 21.

The above is a description of the refrigerant circuit configuration inside the outdoor unit 2.
The configuration of the refrigerant circuit of the separate unit 3 will be described below with reference to FIG.

(Common Receiver)
A refrigerant pipe 201 , a liquid supply pipe 203 , and a liquid pipe 303 are connected to the common receiver 31 .
The common receiver 31 receives the refrigerant that has been condensed in the gas cooler 25 of each outdoor unit 2 and is in a gas-liquid two-phase state from the liquid supply pipe 203, and separates the refrigerant into a gas refrigerant in a gas phase state and a liquid refrigerant in a liquid phase state.

The refrigerant pipe 201 is connected to a gas phase portion of the common receiver 31 in which gas refrigerant accumulates, and the gas refrigerant flows inside the refrigerant pipe 201 .
The gas refrigerant separated in the common receiver 31 is supplied evenly to the second stage compression sections 22 a of the compressors 21 of the outdoor units 2 via the refrigerant pipes 201 .
The gas refrigerant flowing from the common receiver 31 to the compressor 21 of each outdoor unit 2 passes through the check valve 27. The check valve 27 prevents the gas refrigerant from flowing back in the refrigerant pipe 201 in the direction from the compressor 21 to the common receiver 31.

Normally, each outdoor unit 2 has its own receiver. If the gas refrigerant sent from the gas cooler 25 passes directly through the individual receiver, differences in the performance of the receivers in each outdoor unit 2 will result in bias in the amount of gas refrigerant supplied to the compressor 21 and the proportion of gas phase between the outdoor unit units 2. Therefore, by supplying gas refrigerant from the common receiver 31 of the separate unit 3 to the compressor 21 of each outdoor unit 2, it is possible to supply gas refrigerant evenly to each outdoor unit 2.

The liquid pipe 303 is connected to the liquid phase portion of the common receiver 31 where the liquid refrigerant accumulates, and the liquid refrigerant flows inside. The liquid pipe 303 branches in two directions on the way to the load device 4. One of the liquid pipes 303 branches further in two directions after branching, and the liquid refrigerant is sent to an area where it exchanges heat with the third electronic expansion valve 34 connected to one of the two directions, and the subcooling coil 33 connected to the other direction.

One of the liquid refrigerants sent to the third electronic expansion valve 34 is decompressed and expanded at a predetermined opening in the third electronic expansion valve 34, and flows into the subsequent subcooling coil 33. The other liquid refrigerant is cooled by heat exchange with the subcooling coil 33, and then flows into the load side liquid sending pipe 301 and is sent to the load 4.
The other liquid pipe 303 after the first branching has the same configuration as above.

The other liquid refrigerant in one liquid pipe 303 that has exchanged heat with the subcooling coil 33 and the other liquid refrigerant in the other liquid pipe 303 that has exchanged heat with the subcooling coil 33 are each merged in the load side liquid sending pipe 301. The load side liquid sending pipe 301 is connected to the load 4, and the merged liquid refrigerant is sent to the load 4 and used for heat exchange with air in the load side heat exchanger 41.
The refrigerant that has passed through the load device 4 is reduced in pressure and expanded in the load device side expansion valve 42, increasing the proportion of liquid phase, and then passes through the load device side heat exchanger 41 to become mixed with the refrigeration oil in the load device 4.

(Supercooling coil)
The subcooling coil 33 circulates the liquid refrigerant decompressed and expanded by the third electronic expansion valve 34 inside, thereby exchanging heat with the other liquid refrigerant in the one and other liquid pipes 303 and cooling the other liquid refrigerant. The liquid refrigerant that has been heated by the heat exchange in the subcooling coil 33 is sent to the common accumulator 32 via the subcooling pipe 304.

(Common accumulator)
The common accumulator 32 is connected to a load-side suction pipe 302 , a subcooling pipe 304 , and the suction pipe 202 .
The common accumulator 32 separates the refrigerant after heat exchange, supplied via the subcooling pipe 304, into a gas phase and a liquid phase. Also, the common accumulator 32 separates the refrigerant and refrigerating machine oil supplied from the load device 4 via the load device side suction pipe 302 into a gas phase and a liquid phase.

The gas refrigerant separated in the common accumulator 32 is sent to the compressor 21 of each outdoor unit 2 via the suction pipe 202. At this time, the refrigeration oil separated and stored in the common accumulator 32 is mixed again with the gas refrigerant at a predetermined mixing ratio. The mixed gas refrigerant and refrigeration oil are supplied evenly to the individual accumulators 22 of each outdoor unit 2, respectively, via the suction pipe 202.

Normally, the mixture ratio of the refrigerant and refrigeration oil sent from the load device 4 through the load device side suction pipe 302 is very unstable. Therefore, by interposing the common accumulator 32 of the separate unit 3 between the individual accumulators 22 and the load device 4, it is possible to supply gas refrigerant and refrigeration oil at a predetermined mixture ratio to the individual accumulators 22 of each outdoor unit 2.
The above is a description of the refrigerant circuit configuration within the separate unit 3.

(Action and Effect)
The refrigeration device 1 according to the embodiment of the present disclosure is configured such that a common receiver 31 shared between each outdoor unit 2 is provided in the separate unit 3, and the common receiver 31 evenly supplies gas refrigerant to the compressor 21 of each outdoor unit 2. In other words, the refrigerant is not separated into gas and liquid in the receiver specific to each outdoor unit 2 before being supplied to the compressor 21 of each outdoor unit 2.
This makes it possible to suppress unevenness in the amount of refrigerant supplied to the compressors 21 between the outdoor unit units 2. Therefore, it is possible to suppress a decrease in the cooling performance of the refrigeration device 1 caused by unevenness in the amount of refrigerant between the outdoor unit units 2.

Furthermore, when the amount of refrigerant becomes uneven between the outdoor unit units 2, there is no need to stop operation of the refrigeration apparatus 1 for maintenance. Furthermore, there is no need to adjust the amount of refrigerant between the outdoor unit units 2 by, for example, varying the rotation speed of the compressor 21 of one of the outdoor unit units 2. This makes it possible to adjust the amount of gas refrigerant supplied to the compressor 21 between the outdoor unit units 2 without consuming extra energy during operation of the refrigeration apparatus 1 and without taking time.
Furthermore, by sharing the receiver among the plurality of outdoor unit units 2, it becomes unnecessary to provide a receiver in each outdoor unit 2. This allows the weight of each outdoor unit 2 to be reduced.

Furthermore, according to the above configuration, the common accumulator 32 is provided in the separate unit 3. That is, the common accumulator 32 of the separate unit 3 evenly supplies the refrigerant, which is a mixture of gas refrigerant and refrigerating machine oil at a predetermined ratio, to the individual accumulators 22 of each outdoor unit 2.
As a result, refrigerant with an unstable mixture ratio of gas refrigerant and refrigeration oil sent from the load device 4 is not supplied to each outdoor unit 2. In other words, it is possible to prevent unevenness in the amounts of gas refrigerant and refrigeration oil supplied to the compressors 21 between the outdoor unit units 2. Therefore, it is possible to prevent a decrease in the cooling performance of the refrigeration device 1 caused by unevenness in the amount of refrigeration oil between the outdoor unit units 2.

Furthermore, according to the above configuration, the supercooling coil 33 is provided downstream of the common receiver 31 in the separate unit 3. As a result, the supercooling coil 33, which was conventionally provided in each outdoor unit 2, is provided only in the separate unit 3, simplifying the piping design. Also, the piping length can be kept short.
Furthermore, there is no need to provide the subcooling coil 33 in each outdoor unit 2, and the weight of each outdoor unit 2 can be reduced.

Furthermore, according to the above configuration, each outdoor unit 2 has multiple compressors 21. As a result, the gas refrigerant and refrigeration oil are evenly distributed to each compressor 21 from the individual accumulators 22, and a highly efficient outdoor unit 2 can be realized in which there is no imbalance in the amount of refrigeration oil and refrigerant between the compressors 21.

Furthermore, according to the above configuration, each outdoor unit 2 has the same number of oil separators 23 as the compressors 21. This allows the outdoor unit 2 to be configured with a smaller capacity than if a common oil separator 23 were provided between the compressors 21, and each outdoor unit 2 can be made compact.

Other Embodiments
Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configurations are not limited to those of the embodiments, and addition, omission, substitution, and other modifications of the configurations are possible within the scope of the gist of the present disclosure. Furthermore, the present disclosure is not limited to the embodiments, but is limited only by the claims.

In the above embodiment, two outdoor unit units 2 are connected in parallel to the separate unit 3 via the refrigerant piping 201, the suction pipe 202, and the liquid supply pipe 203, but three or more outdoor unit units 2 may be connected in parallel to the separate unit 3.

In the above embodiment, a two-stage compressor 21 is used as the compressor 21, but a compressor 21 that performs only one stage of compression may also be used. Also, a compressor 21 that performs three or more stages of compression may also be used.

In addition, as shown in FIG. 1, the outdoor unit 2 and the separate unit 3 described in the above embodiment are arranged close to each other, but as shown in FIG. 4, the separate unit 3 and the outdoor unit 2 may be arranged apart.
This allows either a plurality of outdoor unit units 2 or a separate unit 3 to be provided in an area where installation space is restricted. Therefore, in an area where installation space is not restricted, units other than the units placed in the restricted area can be placed, increasing the degree of freedom in design regarding placement.
Further, for the same purpose as above, a configuration may be adopted in which only one outdoor unit 2 is disposed away from the other outdoor unit 2 and the separate unit 3 .

Furthermore, any one of the length, width, and height dimensions of the second casing 30 of the separate unit 3 may be the same as any one of the length, width, and height dimensions of the first casing 20 of the outdoor unit 2 .
This increases the degree of freedom in design regarding the arrangement, and also improves the aesthetic appearance when the outdoor unit 2 and the separate unit 3 are arranged close to each other.

In addition, in the above embodiment, _CO2 is used as the refrigerant, but a refrigerant such as freon may also be used.

In addition, in the above embodiment, one load device 4 is connected to the separate unit 3 via the load device side liquid supply pipe 301 and the load device side suction pipe 302, but multiple load devices 4 may be connected in parallel to the separate unit 3.

In addition, in the above embodiment, one separate unit 3 is used, but the refrigeration system 1 may be configured with multiple separate units 3, for example, by providing one separate unit 3 that houses a centralized receiver and one separate unit 3 that houses a centralized accumulator.

In addition, in the above embodiment, the refrigeration device 1 has a refrigerator, a freezer, a showcase, etc. as the load device 4, but the refrigeration device 1 may have an air conditioner as the load device 4.

2, each outdoor unit 2 may have the same number of oil pots 24 as the compressors 21 and corresponding to each of the compressors 21. Hereinafter, the configuration of the oil pots 24 when the outdoor unit 2 has the oil pots 24 will be described.
The oil pot 24 is provided to prevent uneven distribution of refrigeration oil in each compressor 21 .

The upper part of the oil pot 24 and the second stage compression section 22a of the compressor 21 are connected by a second oil pot pipe 209, and the lower part of the oil pot 24 and the first stage compression section 21a of the compressor 21 are connected by a first oil pot pipe 211.
The oil pots 24 are connected to each other via an oil equalization pipe 208. The oil equalization pipe 208 is provided to eliminate unevenness in the amount of oil stored among the oil pots 24.

When the compressor 21 is operating, the oil pot 24 receives refrigeration oil sent from the oil separator 23 via the oil return pipe 207 and refrigeration oil sent from the second stage compression section 22a via the second oil pot pipe 209.

The oil pot 24 also has multiple level switches spaced apart along the height of the wall inside the oil pot 24. Each level switch detects the oil level inside the oil pot 24. When the oil level drops to a predetermined height, the level switch outputs a signal indicating the drop in the oil level to a control device (not shown).

When the control device receives a signal from the level switch indicating a drop in the oil level, it adjusts the opening of the solenoid valves 28 provided in the oil return pipe 207 and the oil equalization pipe 208 to appropriately adjust the flow rate of refrigeration oil flowing through each pipe. By the control device controlling the opening of the solenoid valves 28, the amount of refrigeration oil flowing in from the oil separator 23 and the remaining amount of refrigeration oil between each oil pot 24 are appropriately adjusted.

<Additional Notes>
The refrigeration device 1 described in the embodiment can be understood, for example, as follows.

(1) The refrigeration device 1 according to the first aspect includes a first casing 20, a plurality of outdoor unit units 2 each having an individual accumulator 22 housed in the first casing 20, and a compressor 21 housed in the first casing 20 and supplied with refrigeration oil from the individual accumulator 22, a second casing 30 arranged independently of the first casing 20, and a separate unit 3 having a common receiver 31 housed in the second casing 30, and refrigerant piping 201 that connects the common receiver 31 and the compressors 21 of the plurality of outdoor unit units 2 in parallel and supplies refrigerant from the common receiver 31 to the compressors 21.

As a result, the common receiver 31 of the separate unit 3 supplies refrigerant evenly to the compressors 21 of each outdoor unit 2, preventing uneven distribution of the amount of gas refrigerant supplied to the compressors 21 between the outdoor unit units 2.

(2) The refrigeration device 1 according to the second aspect is the refrigeration device 1 according to (1), and the separate unit 3 may further have a common accumulator 32 housed in the second casing 30, and may further have suction pipes 202 that connect the common accumulator 32 to the individual accumulators 22 of the outdoor unit units 2, respectively, and supply the refrigeration oil from the common accumulator 32 to the individual accumulators 22.

As a result, the common accumulator 32 evenly supplies a predetermined mixture ratio of gas refrigerant and refrigeration oil to the individual accumulators 22, preventing uneven distribution of the amount of refrigeration oil supplied to the compressors 21 between the outdoor unit units 2.

(3) The refrigeration device 1 according to the third aspect is the refrigeration device 1 according to (1) or (2), in which the separate unit 3 further has a supercooling coil 33, and the supercooling coil 33 may be housed in the second casing 30.

As a result, the supercooling coil 33 is only located in the separate unit 3, simplifying the piping design. In addition, the piping length can be kept short.

(4) The refrigeration device 1 according to the fourth aspect is any one of the refrigeration devices 1 according to (1) to (3), and the outdoor unit units 2 may have multiple compressors 21 housed in the first casing 20.

This allows for a highly efficient outdoor unit 2 in which there is no imbalance in the amount of refrigerant and refrigeration oil between the compressors 21.

(5) The refrigeration device 1 according to the fifth aspect is the refrigeration device 1 according to (4), in which the outdoor unit units 2 have the same number of oil separators 23 as the compressors 21, and the oil separators 23 may be housed in the first casing 20.

This allows the outdoor unit 2 to be configured with a smaller capacity than if a common oil separator 23 were provided between the compressors 21, making each outdoor unit 2 more compact.

(6) The refrigeration device 1 according to the sixth aspect is any one of the refrigeration devices 1 according to (1) to (5), and any one of the length, width, and height dimensions of the second casing 30 may be the same as any one of the length, width, and height dimensions of the first casing 20.

This increases the degree of freedom in designing the placement of the outdoor unit 2 and the separate unit 3. It also improves the aesthetic appearance when the outdoor unit 2 and the separate unit 3 are placed close to each other.

1... Refrigeration device 2... Outdoor unit 3... Separate unit 4... Load 20... First casing 21... Compressor 21a... First stage compression section 22... Individual accumulator 22a... Second stage compression section 23... Oil separator 24... Oil pot 25... Gas cooler 26... First electronic expansion valve 27... Check valve 28... Solenoid valve 29... Second electronic expansion valve 30... Second casing 31... Common receiver 32... Common accumulator 33... Subcooling coil 34... Third electronic expansion valve 40... Load body 41... Load side heat exchanger 42... Load side expansion valve 200... Outdoor unit piping 201... Refrigerant piping 202... Suction pipe 203... Liquid supply pipe 204... Gas pipe 205... Compressor suction pipe 206... Return pipe 207... Oil return pipe 208... Oil equalization pipe 209: Second oil pot pipe 210: Discharge pipe 211: First oil pot pipe 212: Bypass pipe 300: Separate unit piping 301: Load side liquid supply pipe 302: Load side suction pipe 303: Liquid pipe 304: Supercooling pipe

Claims (6)

A first casing;
an individual accumulator housed in the first casing;
a compressor housed in the first casing and supplied with refrigeration oil from the individual accumulator;
A plurality of outdoor unit units each having
a second casing disposed independently of the first casing;
a common receiver housed in the second casing;
A separate unit having
a refrigerant pipe that connects the common receiver and the compressors of the plurality of outdoor unit units in parallel and supplies a refrigerant from the common receiver to the compressors;
A refrigeration device comprising: The separate unit further includes a common accumulator housed in the second casing,
The refrigeration system according to claim 1 , further comprising suction pipes that connect the common accumulator to the individual accumulators of the plurality of outdoor unit units and supply the refrigeration oil from the common accumulator to the individual accumulators. The separate unit further includes a subcooling coil;
3. The refrigeration apparatus according to claim 1, wherein the subcooling coil is housed in the second casing. The refrigeration device according to any one of claims 1 to 3, wherein the outdoor unit includes a plurality of compressors housed in the first casing. The outdoor unit includes oil separators in the same number as the compressors,
The refrigeration system according to claim 4 , wherein a plurality of the oil separators are housed in the first casing. The refrigeration device according to any one of claims 1 to 5, wherein any one of the length, width, and height dimensions of the second casing is the same as any one of the length, width, and height dimensions of the first casing.

Images