JP2006170610A - Refrigerating plant, refrigerator, air-cooling type condenser unit for refrigerating plant, and compressor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve performance by increasing a refrigeration capacity, and to enable stable operation, in a refrigerating plant using an HFC-based coolant. <P>SOLUTION: A cycle system in a refrigerator is constituted by connecting a compressor 1, a condenser 2, a liquid receiver 5 and a supercooler 3 in this order. In an air-cooling separate-type refrigerator, the liquid receiver is provided in an air-cooling type condenser unit. When flash gas is often generated in a liquid pipe, a vapor-liquid separator is provided integrally in a compressor unit through an accumulator and a partition plate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigeration apparatus, a refrigeration apparatus unit, an air-cooled condenser unit, and a compressor unit for a refrigeration apparatus that use an HFC-based refrigerant, and particularly enables stable operation and performance improvement by increasing the refrigeration capacity. .

As a conventional refrigeration apparatus, for example, as described in Patent Document 1, in an air-cooled separate refrigeration apparatus having a structure in which a compressor unit and an air-cooled condenser unit are separated, the air-cooled condenser unit includes An air-cooled refrigeration apparatus incorporating a liquid receiver is known.
JP-A-8-159568

  Although the above-mentioned prior art is merely considered to reduce the size of the compressor unit, secure the service space, and prevent the cooling performance of the liquid injection from being lowered, the HFC-based pseudoazeotropic refrigerant that does not affect the ozone layer is considered. It is not considered for use. In addition, since the liquid injection outlet is formed in the low-pressure side device, there is a risk of complication of the piping system depending on the type of the low-pressure side device to be connected.

  The object of the present invention is to suppress the HFC-based liquid refrigerant from becoming a flash gas in the middle of the piping from the condenser to the expansion valve even when the HFC-based refrigerant is used for freezing. The purpose is to increase

  Another object of the present invention is to provide a compact compressor unit in an air-cooled separate type refrigerator in which the refrigerator includes a compressor unit and an air-cooled condenser unit, and to reduce the installation space indoors.

  Still another object of the present invention is to make it possible to increase the degree of supercooling of the HFC-based liquid refrigerant, and to prevent the uncondensed gas from being mixed into the liquid refrigerant guided to the low-pressure side equipment or the liquid injection line. There is.

  Another object of the present invention is to simplify the piping system.

  In order to achieve the above object, the first feature of the present invention is that in a refrigeration apparatus having a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator, an HFC-based pseudoazeotropic refrigerant mixture is supplied by the compressor. Piping for closed circulation, a condenser for condensing the refrigerant discharged from the compressor, a liquid receiver into which the refrigerant from the condenser flows, and further cooling the liquid refrigerant from the liquid receiver And an expansion valve for expanding the refrigerant from the subcooler, and an evaporator for evaporating the refrigerant from the expansion valve.

  A second feature of the present invention is that in a refrigeration apparatus having a scroll compressor, a condenser, a receiver, an expansion valve, and an evaporator, an HFC refrigerant such as R404A and R507A is closed and circulated by the scroll compressor. A pipe, a condenser for condensing the HFC refrigerant discharged from the scroll compressor, a receiver into which the HFC refrigerant from the condenser flows, and an HFC system having a dryness of 0 from the receiver A pipe for taking out only the liquid refrigerant and sending it to the supercooler, an expansion valve for expanding the HFC refrigerant from the subcooler, an evaporator for evaporating the HFC refrigerant from the expansion valve, and the evaporator An accumulator provided in the middle of a refrigerant pipe sent to the scroll compressor and liquid refrigerant between the condenser and the expansion valve are poured into a pressure chamber in the middle of the compression in the scroll compressor. In further comprising a liquid injection line for.

  In the above, a dryer for removing moisture mixed in the refrigerant and a sight glass capable of observing the flow state of the refrigerant are provided in a refrigerant pipe between the supercooler and the expansion valve. It is more preferable to provide the liquid injection line so as to inject the liquid refrigerant between them into the scroll compressor.

  According to a third aspect of the present invention, in a refrigerator having a compressor and a condenser, a refrigerant pipe for sending the HFC quasi-azeotropic mixed refrigerant from the compressor to the condenser, and a refrigerant from the condenser , A supercooler for further cooling only the liquid refrigerant taken out from the liquid receiver, and a refrigerant pipe for sending the refrigerant from the supercooler to the low-pressure equipment side And a liquid injection line for injecting a part of the liquid refrigerant in the refrigerant pipe into the compression chamber of the compressor, and a refrigerant pipe for sending the refrigerant from the low-pressure device side to the compressor. is there.

  According to a fourth aspect of the present invention, there is provided a refrigerator having a scroll compressor and a condenser, and a pipe for sending HFC pseudo-azeotropic mixed refrigerants such as R404A and R507A compressed by the scroll compressor to the condenser. A receiver into which the refrigerant from the condenser flows, a refrigerant pipe for taking out only the liquid refrigerant having a dryness of 0 from the receiver and sending it to the supercooler, and a low pressure from the supercooler. A refrigerant pipe for placing on the equipment side, a dryer provided in the middle of the refrigerant pipe to remove moisture mixed in the refrigerant, a sight glass capable of observing the flow state of the refrigerant, and a space between the dryer and the sight glass A liquid injection line for injecting liquid refrigerant into a compression chamber in the middle of compression in the scroll compressor, refrigerant piping for sending refrigerant from the low-pressure equipment side to the compressor, and In that a accumulator provided in the middle of the refrigerant pipe.

  According to a fifth aspect of the present invention, in the air-cooled condenser unit for a refrigeration apparatus including a condenser and a cooling fan, a refrigerant pipe for sending HFC-based pseudoazeotropic refrigerant mixture from the compressor unit side to the condenser; A liquid receiver in which refrigerant from the condenser flows, a supercooler for further cooling only the liquid refrigerant taken out from the liquid receiver, and the refrigerant from the subcooler is compressed And a refrigerant pipe for sending to the machine unit side.

  According to a sixth aspect of the present invention, in the compressor unit for a refrigerating apparatus including a scroll compressor, an HFC pseudo-azeotropic mixed refrigerant such as R404A and R507A compressed by the scroll compressor is used as an air-cooled condenser for a refrigerating apparatus. A pipe for sending to the condenser of the unit, a refrigerant pipe for flowing the refrigerant from the condenser unit to the low-pressure equipment side, a dryer provided in the middle of the refrigerant pipe to remove moisture mixed in the refrigerant, A liquid injection line for injecting liquid refrigerant downstream of the dryer into a compression chamber in the middle of compression in the scroll compressor, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, and refrigerant from the low-pressure device side A refrigerant pipe for feeding to the scroll compressor and an accumulator provided in the middle of the refrigerant pipe; That.

  According to a seventh aspect of the present invention, in the compressor unit for a refrigeration apparatus including a scroll compressor, piping for sending the refrigerant compressed by the scroll compressor to the condenser of the air-cooled condenser unit for the refrigeration apparatus; Refrigerant piping for flowing the refrigerant from the condenser unit to the low-pressure equipment side, a gas-liquid separator provided in the middle of the refrigerant piping, and compression of the liquid refrigerant downstream of the gas-liquid separator in the scroll compressor A liquid injection line for injecting into the compression chamber on the way, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, a refrigerant pipe for sending refrigerant from the low-pressure equipment side to the scroll compressor, and An accumulator provided in the middle of the refrigerant pipe, and the accumulator and the gas-liquid separator are integrally configured to store the refrigerant in the gas-liquid separator. Lies in the structure so as to be cooled by refrigerant in Yumureta.

  If the air-cooled condenser unit for the refrigeration apparatus is installed outdoors, and the compressor unit for the refrigeration apparatus is installed indoors and connected by piping, an air-cooled separate type refrigerator can be obtained, and an expansion valve and an evaporator A refrigeration system is configured by connecting low-pressure equipment having

  According to an eighth aspect of the present invention, in a refrigerator having a scroll compressor and a condenser, a pipe for sending HFC-based pseudoazeotropic mixed refrigerants such as R404A and R507A compressed by the scroll compressor to the condenser A receiver into which the refrigerant from the condenser flows, a refrigerant pipe for taking out only the liquid refrigerant having a dryness of 0 from the receiver and sending it to the supercooler, and a low pressure from the supercooler. A refrigerant pipe for sending to the device side, a gas-liquid separator provided in the middle of the refrigerant pipe, a dryer provided in the refrigerant pipe downstream of the gas-liquid separator and adsorbing and removing moisture mixed in the refrigerant; A sight glass provided in the refrigerant pipe downstream of the dryer and capable of observing the flow state of the refrigerant and the moisture content in the refrigerant, and the liquid refrigerant between the dryer and the sight glass is compressed in the scroll compressor. A liquid injection line for injecting into the compression chamber, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, a refrigerant pipe for sending refrigerant from the low pressure device side to the scroll compressor, and An accumulator provided in the middle of the refrigerant pipe, the accumulator and the gas-liquid separator are integrally formed, and the refrigerant in the gas-liquid separator can be cooled by the refrigerant in the accumulator. .

  The present invention configured as described above has the following effects.

  That is, in the present invention, HFC pseudo azeotropic refrigerant mixture such as R404A and R507A is used as the refrigerant, and the cycle system is sufficiently condensed by connecting the compressor system, the condenser, the liquid receiver, and the subcooler in this order. For example, a liquid refrigerant having a dryness of 0 can be led to the supercooler, and the heat transfer efficiency in the supercooler can be significantly improved.

  In addition, by installing the air-cooled condenser part outdoors as an air-cooled condenser unit and the compressor part indoors as a compressor unit, it is an air-cooled separate refrigeration unit, and a receiver is built in the air-cooled condenser unit side. In the conventional system having a liquid receiver on the compressor unit side, the present invention can reduce the number of liquid pipes required between the compressor unit and the air-cooled condenser unit to one. . In addition, since there is no liquid receiver in the compressor unit, the compressor unit becomes compact as a result, and it is possible to greatly reduce the installation space of the compressor unit indoors such as a machine room. .

  And a compressor unit including an accumulator, and an air-cooled condenser unit having a liquid receiver (first liquid receiver) for temporarily storing the liquefied refrigerant, and the compressor unit and the air-cooled condenser unit. An air-cooled separate refrigeration apparatus having a separated structure is provided, and a receiver for liquid-gas separation (second receiver) is provided in the compressor unit, and the receiver and the accumulator in the compressor unit are provided. By separating the partition plate into an integral structure, the degree of supercooling of the liquid refrigerant can be increased.

  In addition, if the outlet of the liquid injection line is provided in the refrigerant pipe in the refrigerator or the compressor unit, the piping system may be complicated regardless of the type of low-pressure equipment connected to the refrigerator. Absent.

  Compared to conventional HCFC refrigerants such as R22, condensate refrigerant is less likely to be supercooled in HFC-type pseudoazeotropic refrigerant refrigerants for refrigeration equipment such as R404A and R507A. The amount of heat exchange required to obtain the degree of cooling is approximately doubled.

  On the other hand, R404A has a latent heat of vaporization of about 70% smaller than that of R22. Therefore, the refrigerating capacity can be expanded by increasing the degree of supercooling as much as possible. Further, in the liquid injection method in which the discharge gas of the compressor is cooled with the condensate refrigerant, supplying a stable supercooled liquid to the compressor intermediate pressure portion (compression chamber) is an important factor in terms of reliability.

  Therefore, in the HFC-based pseudoazeotropic refrigerant mixture, it is extremely important to sufficiently cool the condensate in order to expand the refrigerating capacity and improve the reliability.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a basic refrigeration cycle of a refrigeration apparatus according to an embodiment of the present invention. In the figure, A is an air-cooled integrated refrigeration in which a condenser is air-cooled and a compressor, an accumulator, etc. are housed in one container. The machine (condenser unit), B is a low-pressure side device (evaporator unit) equipped with an evaporator, an expansion valve, etc., and the refrigerator A and the low-pressure side device B are connected at the pipe connection parts 15 and 16 to be refrigerated. A cycle is configured.

  1 will be described in more detail. 1 is a scroll compressor, 2 is a condenser provided on the downstream side of the compressor, 3 is a subcooler constructed integrally with the condenser 2, Gas refrigerants such as R404A and R507A discharged from the compressor 1 are cooled by the cooling fan 14 in the condenser 2 and condensed to become liquid refrigerant. The liquid refrigerant once condensed is temporarily stored in the liquid receiver 5, and thereafter, only the liquid refrigerant having a dryness of 0 is taken out from the liquid receiver, led to the supercooler 3, and supercooled. Yes.

  The liquid refrigerant supercooled by the supercooler 3 includes a dryer (moisture removing device that adsorbs and removes moisture in the refrigerant) 9 and a sight glass (which observes the flow state of the refrigerant) 8 provided in the refrigerator A. , Flows through the pipe connection 15 to the low-pressure side device II side, flows through the solenoid valve 7, the expansion valve 6 and the evaporator 4 and evaporates to become a gas refrigerant again, and then passes through the pipe connection side 16 to be frozen. It flows to the machine A side, passes through the accumulator 13, and is sucked into the compressor 1. The sight glass 8 not only observes the flow state of the refrigerant, but also can observe the moisture content contained in the refrigerant, and includes an indicator that changes color when the moisture amount exceeds a certain amount. Yes.

  The refrigerant pipe between the dryer 9 and the sight glass 8 and the intermediate pressure chamber (compression chamber) of the scroll compressor 1 are connected by a liquid injection pipe 10. The liquid injection pipe 10 has an electromagnetic valve 12 and a liquid injection amount. An electronic expansion valve 11 to be controlled is provided. By having this liquid injection line, liquid refrigerant is injected into the intermediate pressure chamber of the scroll compressor 1 and the compressed gas is cooled, so that the discharge gas temperature of the scroll compressor 1 is kept below an allowable value. The dryer 9 also has a function as a filter. By providing a liquid injection line on the downstream side, it is possible to prevent dust and the like from flowing into the electronic expansion valve 11 and to protect the electronic expansion valve 11. it can.

  Further, the electromagnetic valve 12 is controlled to be closed when the compressor 1 is stopped, and the electronic expansion valve 11 is prevented from being fully closed every time the compressor is stopped during operation of the refrigerator. Thereby, the lifetime of the electronic expansion valve 11 can be improved. In other words, the electronic expansion valve is limited in the number of times that it can be fully closed, and the life of the electronic expansion valve is shortened as the frequency of full closing increases.

  It should be noted that the liquid refrigerant take-out portion of the liquid injection line may be a portion that can take out the liquid refrigerant other than the above, and for example, the liquid refrigerant is taken out from the liquid refrigerant pipe in the liquid receiver 5 or downstream of the subcooler 3. Anyway.

  According to the present embodiment, the cycle system is connected in the order of the compressor, the condenser, the liquid receiver, and the supercooler, and the liquid refrigerant having a dryness of 0 is guided from the liquid receiver to the supercooler. Therefore, the heat transfer efficiency in the supercooler can be remarkably improved, and HFC-based pseudoazeotropic refrigerants such as R404A and R507A that are difficult to supercool can be sufficiently subcooled. Stable operation is possible even when using, and the performance can be improved by increasing the refrigeration capacity.

  FIG. 2 shows an embodiment in which the refrigerator is an air-cooled separate type. The air-cooled separate refrigerator is composed of a compressor unit Aa and an air-cooled condenser unit Ab, and is connected to the low-pressure side device B at the pipe connection portions 15 and 16 as in the case of FIG. 1, and each unit Aa and Ab. Between them, the pipe connection parts 17 and 18 are connected to form a refrigeration cycle.

  In the air-cooled condenser unit Ab, a condenser 2, a supercooler 3, a liquid receiver 5, a cooling fan 14 and the like are provided, and in the compressor unit Aa, a scroll compressor 1, an accumulator 13 and the like are provided. As in the embodiment of FIG. 1, a liquid injection line is also provided.

  As described above, in the case where the refrigerator is an air-cooled separate refrigerator composed of a compressor unit and an air-cooled condenser unit, the liquid receiver is provided in the compressor unit by providing the liquid receiver in the air-cooled condenser unit. The compressor is eliminated, and a compact compressor unit is obtained accordingly. The compressor unit is generally installed in the machine room, but according to the present embodiment, the installation space in the machine room can be greatly reduced. In some cases, the compressor unit is built in the low-pressure side device. In this case, the effective space in the low-pressure side device can be expanded and the serviceability can be improved.

  FIG. 3 is also substantially the same as FIG. 2 and is an embodiment in which the refrigerator is an air-cooled separate type, and this air-cooled separate type refrigerator is composed of a compressor unit Aa and an air-cooled condenser unit Ab. The air-cooled condenser unit Ab is the same as that in FIG. 2, but the compressor unit Aa has a gas-liquid separator (second liquid receiver) 19 integrally formed above the accumulator 13 via a partition plate 20. There is a feature in that. Other configurations are the same as those in FIG.

  As described above, the gas-liquid separator is provided in the compressor unit of the refrigerator, and the liquid refrigerant from the supercooler 3 is further cooled by the refrigerant gas having a low temperature from the evaporator by integrating the accumulator and the partition plate. By adopting such a structure, the degree of supercooling of the liquid refrigerant can be increased, and it is possible to prevent uncondensed gas from being mixed into the liquid refrigerant guided to the low-pressure device B and the liquid injection line 10.

  This embodiment is especially effective when the compressor unit and the condenser unit are installed in remote locations and the connection piping distance becomes long, and compression is performed even when the pressure loss in the liquid piping increases and flash gas is likely to be generated. A stable operation can be obtained by providing a gas-liquid separator (second receiver) in the machine unit.

  FIGS. 4 and 5 show examples of the arrangement of the air-cooled separate refrigerators.

  Conventionally, generally, as shown in FIG. 4, the compressor unit Aa is provided with a scroll compressor 1, a liquid receiver 5, and an accumulator 13 as shown in the figure. The air-cooled condenser unit Ab and the pipe connecting portions 17 and 18 Was connected.

  On the other hand, in the present invention, as shown in FIG. 5, the compressor unit Aa is provided with the scroll compressor 1, the accumulator 13, and the like, and the liquid receiver 5 is not the compressor unit Aa but air-cooled as shown in the figure. It is provided in the type condenser unit Ab.

Since the liquid receiver is moved into the air-cooled condenser unit in this way, the compressor unit can be made compact, and as shown in the figure, it can be arranged in the dead space in the air-cooled condenser unit. The air-cooled condenser unit itself is not enlarged, and the entire refrigerator can be reduced in size.

  According to the present invention described above, the cycle system is connected in the order of the compressor, the condenser, the liquid receiver, and the supercooler, and the liquid refrigerant having a dryness of, for example, 0 is guided from the liquid receiver to the supercooler. By doing so, the heat transfer efficiency in the supercooler can be remarkably improved, and it is possible to sufficiently supercool the HFC-based pseudoazeotropic mixed refrigerant that is difficult to supercool. Accordingly, even if an HFC-based pseudoazeotropic refrigerant mixture is used, stable operation without generation of flash gas becomes possible, and there is an effect that the refrigeration capacity can be increased and the performance can be improved. In particular, in the case where a liquid injection line is also provided, the liquid refrigerant can be stably supplied to the liquid injection line even if an HFC quasi-azeotropic refrigerant mixture is used, and the performance can be improved more stably.

  In addition, in the case where the refrigerator is an air-cooled separate type refrigerator composed of a compressor unit and an air-cooled condenser unit, the receiver is provided in the air-cooled condenser unit so that the receiver is provided in the compressor unit. There is an effect that a compact compressor unit can be obtained.

  Furthermore, in the case where a gas-liquid separator is provided in the compressor unit of the air-cooled separate type refrigerator, and is integrated with the accumulator and the partition plate, heat exchange between the liquid refrigerant and the gas refrigerant is performed. Therefore, it is possible to prevent the uncondensed gas from being mixed into the liquid refrigerant led to the low pressure side device or the liquid injection line.

  In addition, if the outlet of the liquid injection line is provided in the refrigerant pipe in the refrigerator or the compressor unit, the piping system may be complicated regardless of the type of low-pressure equipment connected to the refrigerator. There is no effect.

It is a figure which shows the basic freezing cycle of the freezing apparatus in one Example of this invention. It is a refrigerating cycle figure which shows the Example of this invention in case a refrigerator is an air cooling separate type. It is a refrigerating cycle figure which shows another Example of this invention in case a refrigerator is an air cooling separate type. It is a top view which shows the basic arrangement configuration of the conventional air-cooled separate refrigerator. It is a top view which shows the basic arrangement structure of the air cooling separate type refrigerator in this invention.

Explanation of symbols

  A ... Air-cooled integrated refrigerator, Aa ... Compressor unit, Ab ... Air-cooled condenser unit, B ... Low-pressure side equipment, 1 ... Compressor (scroll compressor), 2. ..Condenser, 3 ... supercooler, 4 ... evaporator, 5 ... receiver, 6 ... expansion valve, 7 ... solenoid valve, 8 ... sight glass, 9 ... Dryer, 10 ... Liquid injection piping, 11 ... Electronic expansion valve, 12 ... Solenoid valve, 13 ... Accumulator, 14 ... Cooling fan, 15, 16, 17, 18, ... -Pipe connection part, 19 ... Gas-liquid separator (second liquid receiver), 20 ... Partition plate.

Claims (10)

  In a refrigeration apparatus having a compressor, a condenser, a liquid receiver, an expansion valve, and an evaporator, a pipe for closing and circulating an HFC-based pseudoazeotropic mixed refrigerant by the compressor, and a refrigerant discharged from the compressor A condenser for condensing the liquid, a liquid receiver into which the refrigerant from the condenser flows, a supercooler for further cooling the liquid refrigerant from the liquid receiver, and a refrigerant from the subcooler is expanded. A refrigeration apparatus comprising an expansion valve and an evaporator for evaporating refrigerant from the expansion valve.   In a refrigeration apparatus having a scroll compressor, a condenser, a receiver, an expansion valve, and an evaporator, piping for closing and circulating an HFC refrigerant such as R404A and R507A by the scroll compressor, and discharging from the scroll compressor A condenser for condensing the HFC-based refrigerant, a liquid receiver into which the HFC-based refrigerant from this condenser flows, and only a HFC-based liquid refrigerant with a dryness of 0 is taken out from this liquid receiver to a supercooler A pipe for sending, an expansion valve for expanding the HFC refrigerant from the subcooler, an evaporator for evaporating the HFC refrigerant from the expansion valve, and a refrigerant pipe sent from the evaporator to the scroll compressor And a liquid injection for injecting liquid refrigerant between the condenser and the expansion valve into a pressure chamber in the middle of compression in the scroll compressor. Refrigeration system characterized in that it comprises a line.   In Claim 2, the dryer which removes the water | moisture content mixed in the refrigerant | coolant in the refrigerant | coolant piping between the said subcooler and an expansion valve, and the sight glass which can observe the flow state of a refrigerant | coolant are provided, The refrigeration apparatus comprising the liquid injection line so as to inject the liquid refrigerant between the two to the scroll compressor.   In a refrigerator having a compressor and a condenser, a refrigerant pipe for sending the HFC-based pseudoazeotropic refrigerant mixture from the compressor to the condenser, and a liquid receiver in which the refrigerant from the condenser flows , A supercooler for further cooling only the liquid refrigerant taken out from the receiver, a refrigerant pipe for sending the refrigerant from the supercooler to the low-pressure device side, and a liquid refrigerant in the refrigerant pipe A refrigerator comprising: a liquid injection line for injecting a part of the refrigerant into a compression chamber of the compressor; and a refrigerant pipe for sending a refrigerant from a low-pressure device side to the compressor.   In a refrigerator having a scroll compressor and a condenser, piping for sending HFC pseudo-azeotropic mixed refrigerant such as R404A and R507A compressed by the scroll compressor to the condenser, and refrigerant from the condenser Into which the refrigerant flows, a refrigerant pipe for taking out only the liquid refrigerant having a dryness of 0 from the liquid receiver and sending it to the supercooler, and a refrigerant pipe for sending the refrigerant from the supercooler to the low-pressure device side A dryer for removing moisture mixed in the refrigerant, a sight glass capable of observing the flow state of the refrigerant, and a liquid refrigerant between the dryer and the sight glass in the scroll compressor A liquid injection line for injecting into a compression chamber in the middle of compression, a refrigerant pipe for sending refrigerant from the low-pressure equipment side to the compressor, and a pipe installed in the middle of the refrigerant pipe Refrigerator, characterized in that a accumulator that is.   In an air-cooled condenser unit for a refrigeration apparatus including a condenser and a cooling fan, a refrigerant pipe for sending HFC-based pseudoazeotropic refrigerant mixture from the compressor unit side to the condenser, and refrigerant from the condenser flow in And a supercooler for further cooling only the liquid refrigerant taken out from the liquid receiver, and a refrigerant pipe for sending the refrigerant from the supercooler to the compressor unit side. An air-cooled condenser unit for a refrigeration apparatus.   In a compressor unit for a refrigerating apparatus having a scroll compressor, a pipe for sending HFC pseudo-azeotropic mixed refrigerants such as R404A and R507A compressed by the scroll compressor to the condenser of the air-cooled condenser unit for the refrigerating apparatus A refrigerant pipe for flowing the refrigerant from the condenser unit to the low-pressure device side, a dryer provided in the middle of the refrigerant pipe to remove moisture mixed in the refrigerant, and the liquid refrigerant downstream of the dryer is the scroll A liquid injection line for injecting into a compression chamber in the middle of compression in a compressor, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, and a refrigerant for sending refrigerant from the low-pressure device side to the scroll compressor A pressure for a refrigeration apparatus comprising a pipe and an accumulator provided in the middle of the refrigerant pipe Aircraft unit.   In a compressor unit for a refrigeration apparatus including a scroll compressor, a pipe for sending a refrigerant compressed by the scroll compressor to a condenser of an air-cooled condenser unit for a refrigeration apparatus, and a low-pressure refrigerant from the condenser unit A refrigerant pipe for flowing to the device side, a gas-liquid separator provided in the middle of the refrigerant pipe, and a liquid refrigerant downstream of the gas-liquid separator for injecting into the compression chamber in the middle of compression in the scroll compressor A liquid injection line, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, a refrigerant pipe for sending refrigerant from the low-pressure device side to the scroll compressor, and an accumulator provided in the middle of the refrigerant pipe The accumulator and the gas-liquid separator are integrally formed, and the refrigerant in the gas-liquid separator is used as the refrigerant in the accumulator. Refrigeration system compressor unit, characterized by being configured so as to be cooled.   The air-cooled condenser unit for the refrigeration apparatus according to claim 6 is installed outdoors, and the compressor unit for the refrigeration apparatus according to claim 7 or 8 is installed indoors and connected by piping. Features an air-cooled separate refrigerator.   In a refrigerator having a scroll compressor and a condenser, piping for sending HFC pseudo-azeotropic mixed refrigerant such as R404A and R507A compressed by the scroll compressor to the condenser, and refrigerant from the condenser An inflowing liquid receiver, a refrigerant pipe for taking out only the liquid refrigerant having a dryness of 0 from the liquid receiver and sending it to the supercooler, and a refrigerant pipe for sending the refrigerant from the supercooler to the low pressure device side The gas-liquid separator provided in the middle of the refrigerant pipe, the dryer provided in the refrigerant pipe downstream of the gas-liquid separator for adsorbing and removing moisture mixed in the refrigerant, and the refrigerant pipe downstream of the dryer Sight glass capable of observing the flow state of refrigerant and the moisture content in the refrigerant, and liquid refrigerant between the dryer and sight glass are injected into the compression chamber in the middle of compression in the scroll compressor. Liquid injection line, an electromagnetic valve and an electronic expansion valve provided in the liquid injection line, a refrigerant pipe for sending refrigerant from the low-pressure device side to the scroll compressor, and provided in the middle of the refrigerant pipe A refrigerating machine comprising: an accumulator, the accumulator and the gas-liquid separator are integrally configured, and the refrigerant in the gas-liquid separator can be cooled by the refrigerant in the accumulator.

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