WO2024127924A1 - Unité de climatisation - Google Patents

Unité de climatisation Download PDF

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Publication number
WO2024127924A1
WO2024127924A1 PCT/JP2023/041728 JP2023041728W WO2024127924A1 WO 2024127924 A1 WO2024127924 A1 WO 2024127924A1 JP 2023041728 W JP2023041728 W JP 2023041728W WO 2024127924 A1 WO2024127924 A1 WO 2024127924A1
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Prior art keywords
heat exchanger
refrigerant
chamber
unit
fan
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PCT/JP2023/041728
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English (en)
Japanese (ja)
Inventor
悠太 井吉
喜記 山野井
猛 宮崎
敦史 吉見
隼人 布
啓 竹中
賢吾 内田
翔太 東
浩彰 松田
Original Assignee
ダイキン工業株式会社
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Publication of WO2024127924A1 publication Critical patent/WO2024127924A1/fr

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  • Patent Document 1 Patent No. 5430604 discloses a cascade refrigeration system equipped with a low-stage refrigeration cycle that uses carbon dioxide refrigerant and a high-stage refrigeration cycle that assists the heat dissipation of the low-stage refrigeration cycle.
  • the high-stage evaporator and the low-stage condenser exchange heat in a cascade condenser, and the auxiliary radiator installed in the front stage of the low-stage refrigeration cycle of the cascade condenser and the high-stage condenser are integrated to form an integrated radiator.
  • Patent Document 1 discloses that HC refrigerants, HFC refrigerants, HFO refrigerants, etc. are used in the high-temperature refrigeration cycle. If a flammable refrigerant leaks from the high-temperature condenser, there is a possibility that the electrical equipment unit may become an ignition source and cause a fire.
  • the air conditioning unit of the first aspect includes an electrical equipment unit, a first heat exchanger, a second heat exchanger, a fan, a casing, and a partition plate.
  • the first heat exchanger exchanges heat between a combustible first refrigerant and air.
  • the second heat exchanger exchanges heat between a non-combustible second refrigerant and air.
  • the fan flows air through the first heat exchanger and the second heat exchanger.
  • the casing houses the electrical equipment unit, the first heat exchanger, the second heat exchanger, and the fan.
  • the partition plate divides the inside of the casing into a first chamber in which the first heat exchanger, the second heat exchanger, and the fan are arranged, and a second chamber in which the electrical equipment unit is arranged.
  • the partition plate has a communication hole that communicates between the first chamber and the second chamber, above the first brazed portion that is located at the top of the multiple brazed portions of the first heat exchanger.
  • the communication hole provided in the partition plate and the fan disposed in the first chamber allow air to flow from the second chamber in which the electrical equipment unit is disposed to the first chamber in which the first heat exchanger through which the first refrigerant flows is disposed. Furthermore, since the communication hole is provided at a position higher than the first brazed portion, which is at the highest position of the first heat exchanger through which the flammable first refrigerant flows, even if the first refrigerant leaks in the first chamber, the first refrigerant can be prevented from flowing above the communication hole. This reduces the possibility of a fire caused by the electrical equipment unit in the second chamber as an ignition source.
  • the air conditioning unit of the second aspect is the air conditioning unit of the first aspect, and the communication hole is a hole for directing air around the electrical equipment unit to the fan.
  • the air around the electrical equipment unit which is a potential ignition source, is directed into the first chamber, so that even if the first refrigerant leaks, the first refrigerant can be prevented from flowing around the electrical equipment unit.
  • the air conditioning unit of the third aspect is the air conditioning unit of the first or second aspect, further comprising a bell mouth.
  • the bell mouth is disposed in the first chamber and has a cylindrical portion surrounding the fan.
  • the lower end of the electrical equipment unit is located above the lower end of the cylindrical portion.
  • a fan is placed inside the cylindrical portion of the bellmouth.
  • the first refrigerant is heavier than air, so even if the first refrigerant leaks, the first refrigerant will accumulate below the bottom end of the cylindrical portion.
  • the bottom end of the board on which the electrical equipment unit is mounted is located above the bottom end of the cylindrical portion, so the first refrigerant can be further prevented from flowing into the electrical equipment unit.
  • the air conditioning unit of the fourth aspect is an air conditioning unit of any one of the first to third aspects, in which the lower end of the electrical equipment unit is located above the first brazed portion.
  • the air conditioning unit of the fourth aspect even if the first refrigerant leaks, the first refrigerant will remain below the first brazed portion.
  • the lower end of the board on which the electrical equipment unit is mounted is located above the first brazed portion, so that the first refrigerant can be further prevented from flowing into the electrical equipment unit.
  • the fifth aspect of the air conditioning unit is an air conditioning unit according to any one of the first to fourth aspects, in which the first heat exchanger is positioned lower than the second heat exchanger.
  • the first heat exchanger through which the flammable refrigerant flows is disposed below the second heat exchanger through which the non-flammable refrigerant flows. Therefore, even if the first refrigerant leaks, the first refrigerant tends to accumulate below, making it easy to realize an air conditioning unit that prevents the first refrigerant from flowing into the electrical equipment unit.
  • the air conditioning unit of a sixth aspect is the air conditioning unit of any one of the first aspect to the fifth aspect, further comprising a first compressor, a second compressor, and a bell mouth.
  • the first compressor is disposed in the second chamber and compresses a first refrigerant.
  • the second compressor is disposed in the second chamber and compresses a second refrigerant.
  • the bell mouth is disposed in the first chamber and has a cylindrical portion surrounding the fan. The terminal of the first compressor and the terminal of the second compressor are located above the lower end of the cylindrical portion.
  • the first refrigerant remains below the lower end of the cylindrical portion of the bellmouth.
  • the terminal is located above the lower end of the cylindrical portion, which reduces the possibility of a fire caused by the terminal of the second chamber as an ignition source.
  • FIG. 1 is a schematic configuration diagram of a dual cascade refrigeration cycle device including an outdoor unit according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view of the outdoor unit.
  • FIG. 2 is a schematic plan view of the outdoor unit.
  • FIG. 4 is a diagram showing the operation of the cascade refrigeration cycle device in cooling operation.
  • FIG. 4 is a diagram showing the operation of the cascade refrigeration cycle device in heating operation.
  • FIG. 4 is a diagram showing a plurality of brazed portions.
  • a cascade refrigeration cycle apparatus 1 employing an outdoor unit 2 is an apparatus used for cooling and heating the interior of a building or the like by performing a vapor compression refrigeration cycle operation.
  • the cascade refrigeration cycle device 1 has a first cycle 10 and a second cycle 20.
  • the cascade refrigeration cycle device 1 of this embodiment has a binary refrigerant circuit consisting of a vapor compression type first cycle 10 and a vapor compression type second cycle 20, and performs a binary refrigeration cycle.
  • a combustible first refrigerant circulates.
  • the first refrigerant has a critical point of, for example, 40°C or higher.
  • the first refrigerant is, for example, a hydrocarbon refrigerant such as R1234yf, R1234ze, or R32, and in this embodiment, is R290.
  • the specific gravity of the first refrigerant is greater than that of air.
  • the second cycle 20 circulates a non-flammable second refrigerant.
  • the second refrigerant has a critical point of, for example, less than 40°C.
  • the second refrigerant includes, for example, carbon dioxide, and in this embodiment, the second refrigerant is a single refrigerant of carbon dioxide.
  • the first cycle 10 and the second cycle 20 are thermally connected via a cascade heat exchanger 30.
  • the cascade refrigeration cycle system 1 comprises an outdoor unit 2 and an indoor unit 3.
  • the outdoor unit 2 and the indoor unit 3 are connected to each other via interconnecting pipes 4 and 5.
  • the first cycle 10 constitutes a subcooling circuit during cooling operation.
  • the first cycle 10 includes a first compressor 11, a first heat exchanger 12, a first expansion mechanism 13, and a cascade heat exchanger 30.
  • the first compressor 11 is a device for compressing the first refrigerant, and is, for example, a volumetric compressor such as a scroll type whose operating capacity can be varied by inverter controlling the compressor motor.
  • the first compressor 11 has a first terminal 111.
  • a power supply wiring is connected to the first terminal 111.
  • the first terminal 111 is a harness connection portion.
  • the first heat exchanger 12 is a device for exchanging heat between the first refrigerant and the outdoor air.
  • the first refrigerant obtains cold or hot heat from the outdoor air.
  • the first heat exchanger 12 is, for example, a fin-and-tube type heat exchanger made up of a large number of heat transfer tubes and fins.
  • the first expansion mechanism 13 is a device that reduces the pressure of the first refrigerant, and is, for example, an electric expansion valve.
  • the cascade heat exchanger 30 is a device for performing heat exchange between a first refrigerant and a second refrigerant without mixing them.
  • the cascade heat exchanger 30 is, for example, a plate-type heat exchanger.
  • the cascade heat exchanger 30 has a first flow path 31 belonging to the first cycle 10 and a second flow path 32 belonging to the second cycle 20.
  • the gas side of the first flow path 31 is connected to the first compressor 11, and the liquid side is connected to the first expansion mechanism 13.
  • the cascade heat exchanger 30 is intended to supercool the second refrigerant cooled by the second heat exchanger 23, and serves as an assistant to the second cycle 20.
  • the second cycle 20 includes a second compressor 21, a switching mechanism 22, a second heat exchanger 23, a cascade heat exchanger 30, a second expansion mechanism 24, and a third heat exchanger 25.
  • the second compressor 21 is a device for compressing the second refrigerant, and is, for example, a scroll type or other positive displacement compressor whose operating capacity can be varied by inverter controlling the compressor motor.
  • the second compressor 21 has a second terminal 211.
  • a power supply wiring is connected to the second terminal 211.
  • the second terminal 211 is a harness connection portion.
  • the switching mechanism 22 is a device that switches between a first state (see the solid line of the switching mechanism 22 in Figure 1) in which the second heat exchanger 23 functions as a radiator for the second refrigerant and the third heat exchanger 25 functions as an evaporator for the second refrigerant, and a second state (see the dashed line of the switching mechanism 22 in Figure 1) in which the second heat exchanger 23 functions as an evaporator for the second refrigerant and the third heat exchanger 25 functions as a radiator for the second refrigerant.
  • the switching mechanism 22 is, for example, a four-way switching valve.
  • the switching mechanism 22 connects the discharge side of the second compressor 21 to the gas side of the second heat exchanger 23, and connects the suction side of the second compressor 21 to the gas side of the third heat exchanger 25.
  • the switching mechanism 22 connects the discharge side of the second compressor 21 to the gas side of the third heat exchanger 25, and also connects the suction side of the second compressor 21 to the gas side of the second heat exchanger 23.
  • the second heat exchanger 23 is a device for exchanging heat between the second refrigerant and the outdoor air.
  • the second refrigerant obtains cold or hot heat from the outdoor air.
  • the second heat exchanger 23 is, for example, a fin-and-tube type heat exchanger made up of a large number of heat transfer tubes and fins.
  • the second cycle 20 has a second flow path 32 of the cascade heat exchanger 30.
  • the gas side of the second flow path 32 is connected to the second heat exchanger 23, and the liquid side is connected to the third heat exchanger 25.
  • the second expansion mechanism 24 is a device that reduces the pressure of the second refrigerant, and is, for example, an electric expansion valve.
  • the third heat exchanger 25 is a device for exchanging heat between the second refrigerant and the indoor air, and is, for example, a fin-and-tube type heat exchanger made up of a large number of heat transfer tubes and fins.
  • the outdoor unit 2 is placed in a space different from the space in which the indoor unit 3 is placed.
  • the outdoor unit 2 is installed outdoors (on the roof of a building, near the exterior wall of a building, etc.).
  • the outdoor unit 2 has the above-mentioned first cycle 10, a part of the second cycle 20, a casing 41, an electrical equipment unit 420 including electrical equipment 42 and a board 43, a fan 44, a bell mouth 45, a partition plate 46, and a refrigerant leakage sensor 47.
  • the outdoor unit 2 has the first compressor 11, first heat exchanger 12, first expansion mechanism 13, second compressor 21, switching mechanism 22, second heat exchanger 23, second expansion mechanism 24, cascade heat exchanger 30 shown in FIG. 1, and the casing 41, electrical equipment 42, board 43, fan 44, bell mouth 45, partition plate 46, and refrigerant leakage sensor 47 shown in FIG. 2.
  • the casing 41 houses the first compressor 11, the first heat exchanger 12, the first expansion mechanism 13, the second compressor 21, the switching mechanism 22, the second heat exchanger 23, the second expansion mechanism 24, the cascade heat exchanger 30, the electrical components 42, the circuit board 43, the fan 44, the bell mouth 45, the partition plate 46, and the refrigerant leakage sensor 47.
  • the casing 41 shown in FIG. 2 has a generally rectangular parallelepiped shape. Specifically, the casing 41 includes a front plate 411, a top plate 412, a bottom plate 413, and side plates 414.
  • the front plate 411 is a plate-like member that forms the front surface of the casing 41.
  • An air outlet is formed in the front plate 411.
  • the air outlet is an opening for blowing the outdoor air that has been taken in from the outside of the casing 41 to the inside of the casing 41 out to the outside of the casing 41.
  • the top plate 412 is a plate-like member that forms the upper surface of the casing 41.
  • the bottom plate 413 is a plate-like member that forms the lower surface of the casing 41.
  • the top plate 412 and the bottom plate 413 face each other.
  • the side plate 414 is a plate-like member that forms the side surface of the casing 41.
  • the lower portion of the side plate 414 is fixed to the bottom plate 413.
  • the casing 41 has an opening 415 for allowing outside air to flow to the communication hole 461 of the partition plate 46 described below.
  • the opening 415 is formed in the side plate 414 that partitions the second chamber S2 described below. Note that the opening 415 does not necessarily have to be formed in the side plate 414, and can be provided in any member that partitions the second chamber S2 from the outside of the casing 41.
  • the electrical equipment unit 420 has electrical equipment 42 (electrical components) mounted on a board 43.
  • the electrical equipment 42 controls the controlled objects such as the first compressor 11, the second compressor 21, the first expansion mechanism 13, the switching mechanism 22, and the second expansion mechanism 24.
  • the electrical equipment 42 includes, for example, cooled elements such as power elements, reactors, capacitors, wiring connections, etc.
  • the board 43 is, for example, a printed circuit board.
  • the board 43 extends in the vertical direction.
  • multiple electrical components 42 are attached to the board 43.
  • the fan 44 directs air to the first heat exchanger 12 and the second heat exchanger 23.
  • the fan 44 directs outdoor air to both the first heat exchanger 12 and the second heat exchanger 23.
  • the fan 44 guides the outdoor air to the first heat exchanger 12 and the second heat exchanger 23, where the outdoor air is heat exchanged with the first refrigerant flowing through the first heat exchanger 12 and with the second refrigerant flowing through the second heat exchanger 23, and then discharged to the outside.
  • the fan 44 is driven by a fan motor. Note that the fan that directs air to the first heat exchanger 12 and the fan that directs air to the second heat exchanger 23 may be provided separately.
  • the bellmouth 45 is disposed on the blowing side of the fan 44.
  • the bellmouth 45 has a cylindrical portion that surrounds the fan 44.
  • the cylindrical portion forms an opening.
  • the fan 44 is disposed inside the cylindrical portion.
  • the fan 44 and the bellmouth 45 overlap the first heat exchanger 12 and the second heat exchanger 23.
  • the bellmouth 45 faces an air outlet (not shown) formed in the front plate 411 of the casing 41.
  • the refrigerant leakage sensor 47 detects leakage of the first refrigerant.
  • the refrigerant leakage sensor 47 is installed at the bottom inside the casing 41.
  • the refrigerant leakage sensor 47 may also detect leakage of the second refrigerant.
  • the partition plate 46 is a plate-shaped member that extends in the vertical direction. The lower part of the partition plate 46 is fixed to the bottom plate 413 of the casing 41.
  • the partition plate 46 divides the inside of the casing 41 into a first chamber S1 and a second chamber S2.
  • the first chamber S1 and the second chamber S2 are each a space defined by the front plate 411, the top plate 412, the bottom plate 413, and the side plates 414 of the casing 41 and the partition plate 46.
  • the first chamber S1 is an air blowing chamber, and is an air guide passage through which air drawn in from the air intake of the outdoor unit 2 flows to the air outlet.
  • the second chamber S2 is a machine room.
  • the first heat exchanger 12, the second heat exchanger 23, the fan 44, and the bell mouth 45 are arranged in the first chamber S1.
  • the second chamber S2 is arranged with the first compressor 11, the second compressor 21, the switching mechanism 22, the first expansion mechanism 13, the second expansion mechanism 24, the electrical equipment unit 420 including the electrical equipment 42 and the board 43, and the refrigerant leakage sensor 47.
  • the partition plate 46 has a communication hole 461. As shown in FIG. 5, the communication hole 461 is provided above the first brazed portion 121, which is the uppermost of the multiple brazed portions 120 of the first heat exchanger 12.
  • the brazed portions 120 are portions in the first chamber S1 where the first refrigerant may leak from the first heat exchanger 12.
  • the brazed portions 120 are joints between the heat transfer tubes that make up the first heat exchanger 12, joints between the heat transfer tubes and the fins, etc.
  • Heat transfer tubes include U-shaped tubes and branch tubes.
  • the multiple brazed portions 120 are joints between hairpin-shaped tubes and U-shaped tubes or branch tubes.
  • the brazed portions also become brazed portions.
  • the vertical height position of the communication hole 461 is indicated by P1
  • the vertical height position of the first brazed portion 121 is indicated by P2.
  • the vertical height position P1 of the communication hole 461 is the lowest end of the communication hole 461. Therefore, the height position P1 of the lowest end of the communication hole 461 is higher than the vertical height position of the first brazed portion 121.
  • the communication hole 461 is a hole for guiding the outside air that flows into the second chamber S2 from the opening 415 of the casing 41 to the first chamber S1.
  • the communication hole 461 is a hole for guiding the air around the electrical component unit 420, which includes the electrical components 42 and the board 43, to the fan 44.
  • the communication hole 461 is a hole for guiding the outside air around the electrical component unit 420, which includes the electrical components 42 and the board 43 in the second chamber S2, to the fan 44 in the first chamber S1.
  • the communication hole 461 is located above the upper end of the first heat exchanger 12. Also, the height position P1 of the communication hole 461 overlaps with the second heat exchanger 23.
  • the communication hole 461 is located above the lower end 451 of the cylindrical portion of the bell mouth 45.
  • the communication hole 461 is located above the first terminal 111 of the first compressor 11 and the second terminal 211 of the second compressor 21.
  • the communication hole 461 is located above the lower end 431 of the electrical equipment unit 420 (here, the board 43).
  • the height position P1 of the lowest end of the communication hole 461 is located above the electrical equipment 42 that is located at the lowest among the multiple electrical equipment 42.
  • the first heat exchanger 12 is located below the second heat exchanger 23. In other words, at least a portion of the first heat exchanger 12 is located below the second heat exchanger 23. The entire first heat exchanger 12 may be located below the second heat exchanger 23, or a portion of the first heat exchanger 12 may be located below the second heat exchanger 23.
  • the first heat exchanger 12 and the second heat exchanger 23 may be separate or integrated.
  • the size of the first heat exchanger 12 may be approximately the same as the size of the second heat exchanger 23, and may be smaller in the vertical height direction.
  • the electrical equipment unit 420 including the electrical equipment 42 and the circuit board 43 is disposed above the first compressor 11 and the second compressor 21.
  • the lower end 431 of the electrical equipment unit 420 (here, the board 43) is located above the lower end 451 of the cylindrical portion of the bellmouth 45.
  • the vertical height position of the lower end 431 of the electrical equipment unit 420 (here, the board 43 to which the electrical equipment 42 is attached) is higher than the opening lower end 451 of the bellmouth 45, which is located on the blowing side of the fan 44.
  • the lowest electrical component 42 among the multiple electrical components 42 is located above the lower end 451 of the cylindrical portion of the bellmouth 45.
  • the lower end 431 of the electrical component unit 420 (here, the board 43) is located above the first brazing portion 121.
  • the height position of the electrical component unit 420 (here, the board 43 to which the electrical components 42 are attached) is above the height position P1 of the first brazing portion 121.
  • the electrical component 42 located at the lowest position among the multiple electrical components 42 is located above the first brazing portion 121.
  • first terminal 111 of the first compressor 11 and the second terminal 211 of the second compressor 21 are located above the lower end 451 of the cylindrical portion of the bell mouth 45.
  • the lower end of the first terminal 111 of the first compressor 11 and the lower end of the second terminal 211 of the second compressor 21 are located above the lower end 451 of the cylindrical portion of the bell mouth 45.
  • the indoor unit 3 is installed indoors (inside the building). As described above, the indoor unit 3 is connected to the outdoor unit 2 via the connecting pipes 4 and 5, and constitutes a part of the second cycle 20.
  • the indoor unit 3 has a third heat exchanger 25.
  • the indoor unit 3 is installed by embedding or hanging in the ceiling of a room of a building or the like, or by hanging on a wall surface of the room.
  • the communication pipes 4, 5 are refrigerant pipes that are installed on-site when the cascade refrigeration cycle apparatus 1 is installed in an installation location such as a building.
  • One end of the liquid side communication pipe 4 is connected to the liquid side end of the outdoor unit 2, and the other end of the communication pipe 4 is connected to the liquid side end of the third heat exchanger 25 of the indoor unit 3.
  • One end of the gas side communication pipe 5 is connected to the gas side end of the outdoor unit 2, and the other end of the communication pipe 5 is connected to the gas side end of the third heat exchanger 25 of the indoor unit 3.
  • Control Unit The components of the outdoor unit 2 and the indoor unit 3 are controlled by the control unit 6.
  • the control unit 6 is configured by communication connection between the electrical equipment 42, the board 43, etc. provided in the outdoor unit 2 and the control board, etc. (not shown) provided in the indoor unit 3.
  • the control unit 6 is illustrated in FIG. 1 at a position separate from the outdoor unit 2 and the indoor unit 3.
  • the control unit 6 controls the components of the cascade refrigeration cycle apparatus 1 (here, the outdoor unit 2 and the indoor unit 3). In other words, the control unit 6 controls the operation of the entire cascade refrigeration cycle apparatus 1.
  • the control unit 6 is realized by a computer.
  • the control unit 6 includes a control arithmetic unit and a storage device.
  • the control arithmetic unit can be a processor such as a CPU or a GPU.
  • the control arithmetic unit reads a program stored in the storage device, and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic unit can write the results of calculations to the storage device and read information stored in the storage device according to the program.
  • the operation of the cascade refrigeration cycle device 1 will be described with reference to Figures 1 to 4.
  • the cascade refrigeration cycle device 1 is capable of performing a cooling operation for cooling indoor air and a heating operation for heating indoor air for air conditioning. In the cooling operation and the heating operation, the operation of the cascade refrigeration cycle device 1 is controlled by the control unit 6.
  • the second refrigerant discharged from the second compressor 21 is sent to the second heat exchanger 23 through the switching mechanism 22.
  • the second refrigerant sent to the second heat exchanger 23 is cooled by exchanging heat with the outdoor air supplied by the fan 44, thereby releasing heat.
  • the second refrigerant that has released heat in the second heat exchanger 23 is sent to the second flow path 32 of the cascade heat exchanger 30.
  • the second refrigerant sent to the second flow path 32 is further cooled in the cascade heat exchanger 30 by exchanging heat with the first refrigerant flowing through the first flow path 31.
  • the second refrigerant that has been further cooled in the cascade heat exchanger 30 is depressurized by the second expansion mechanism 24 and then flows out of the outdoor unit 2.
  • the second refrigerant that flows out of the outdoor unit 2 flows into the indoor unit 3 via the liquid side connecting pipe 4.
  • the second refrigerant is sent to the third heat exchanger 25.
  • the second refrigerant sent to the third heat exchanger 25 evaporates by being heated through heat exchange with the indoor air.
  • the second refrigerant that has evaporated in the third heat exchanger 25 flows out of the indoor unit 3.
  • the second refrigerant that flows out of the indoor unit 3 flows into the outdoor unit 2 via the gas side connecting pipe 5.
  • the second refrigerant is sucked back into the second compressor 21 via the switching mechanism 22.
  • the first refrigerant discharged from the first compressor 11 is sent to the first heat exchanger 12.
  • the first refrigerant sent to the first heat exchanger 12 is cooled and condensed by heat exchange with the outdoor air supplied by the fan 44.
  • the first refrigerant condensed in the first heat exchanger 12 is depressurized by the first expansion mechanism 13 and then sent to the first flow path 31 of the cascade heat exchanger 30.
  • the first refrigerant sent to the first flow path 31 is heated in the cascade heat exchanger 30 by heat exchange with the second refrigerant flowing in the second flow path 32, and evaporates.
  • the first refrigerant evaporated in the cascade heat exchanger 30 is sucked back into the first compressor 11.
  • the switching mechanism 22 is switched to the second state (the state in which the switching mechanism 22 is in the broken line) so that the second heat exchanger 23 functions as an evaporator of the second refrigerant and the third heat exchanger 25 functions as a radiator of the second refrigerant. Also, during heating operation, the first compressor 11 is not started, and the first refrigerant is not circulated in the first cycle 10.
  • the second refrigerant discharged from the second compressor 21 flows out of the outdoor unit 2 through the switching mechanism 22.
  • the refrigerant flowing out of the outdoor unit 2 flows into the indoor unit 3 via the gas side connecting pipe 5.
  • the second refrigerant is sent to the third heat exchanger 25.
  • the second refrigerant sent to the third heat exchanger 25 exchanges heat with the indoor air and is cooled, thereby releasing heat.
  • the second refrigerant that has released heat in the third heat exchanger 25 flows out of the indoor unit 3.
  • the second refrigerant flowing out of the indoor unit 3 flows into the outdoor unit 2 via the liquid side connecting pipe 4.
  • the second refrigerant is sent to the second heat exchanger 23 through the second expansion mechanism 24 and the second flow path 32 of the cascade heat exchanger 30.
  • the second refrigerant sent to the second heat exchanger 23 evaporates by being heated through heat exchange with the outdoor air supplied by the fan 44.
  • the second refrigerant evaporated in the second heat exchanger 23 is sucked back into the second compressor 21 through the switching mechanism 22.
  • the second refrigerant is non-flammable, so there is little risk if it leaks, but the first refrigerant is flammable, so there is a risk of fire if the first refrigerant flows into the electrical equipment unit 420 (particularly the electrical equipment 42), which is a source of ignition.
  • the locations where the first refrigerant is most likely to leak are the multiple brazed parts of the first heat exchanger 12.
  • the communication hole 461 is located above the first brazed part 121, which is the uppermost of the multiple brazed parts 120, so that even if the first refrigerant, which is heavier than air, leaks, the first refrigerant is prevented from flowing above the communication hole 461.
  • the communication hole 461 is located at the top inside the casing 41, so that the outside air that flows into the second chamber S2 passes around the electrical equipment unit 420 (electrical equipment 42 in this case). This can promote the flow of the outside air around the electrical equipment unit 420 (electrical equipment 42 in this case) into the first chamber S1. This prevents the leaked first refrigerant from flowing around the electrical equipment 42.
  • the first refrigerant above the lower end 451 of the cylindrical portion of the bell mouth 45 passes through the cylindrical portion of the bell mouth 45 and the outlet of the casing 41 and is discharged outside the casing 41.
  • the outdoor unit 2 as an air conditioning unit includes an electrical equipment unit 420, a first heat exchanger 12, a second heat exchanger 23, a fan 44, a casing 41, and a partition plate 46.
  • the first heat exchanger 12 exchanges heat between a combustible first refrigerant and air.
  • the second heat exchanger 23 exchanges heat between a non-combustible second refrigerant and air.
  • the fan 44 passes air through the first heat exchanger 12 and the second heat exchanger 23.
  • the casing 41 houses the electrical equipment unit 420, the first heat exchanger 12, the second heat exchanger 23, and the fan 44.
  • the partition plate 46 divides the inside of the casing 41 into a first chamber S1 in which the first heat exchanger 12, the second heat exchanger 23, and the fan 44 are arranged, and a second chamber S2 in which the electrical equipment unit 420 is arranged.
  • the partition plate 46 has a communication hole 461 that connects the first chamber S1 and the second chamber S2 above the first brazed portion 121, which is the uppermost of the multiple brazed portions 120 of the first heat exchanger 12.
  • the communication hole 461 provided in the partition plate 46 and the fan 44 provided in the first chamber S1 allow air to flow from the second chamber S2 in which the electrical equipment unit 420 is arranged to the first chamber S1 in which the first heat exchanger 12 through which the first refrigerant flows is arranged.
  • the communication hole 461 is provided at a position P1 higher than the first brazed portion 121 at the highest position P2 of the first heat exchanger 12 through which the flammable first refrigerant flows, so that even if the first refrigerant leaks in the first chamber S1, the first refrigerant can be prevented from flowing above the communication hole 461. Therefore, the possibility of ignition caused by the electrical equipment unit 420 in the second chamber S2 as an ignition source can be reduced.
  • This air conditioning unit is particularly useful in the case of a highly flammable (A3) refrigerant such as R290.
  • the outdoor unit 2 as an air conditioning unit according to this embodiment is the outdoor unit 2 described above in (4-1), and the communication hole 461 is a hole for guiding air around the electrical component unit 420 to the fan.
  • the air around the electrical equipment unit 420 which is a potential ignition source, is guided to the first chamber S1 through the communication hole 461, so that even if the first refrigerant leaks, the first refrigerant is prevented from flowing around the electrical equipment unit 420.
  • the outdoor unit 2 as an air conditioning unit according to this embodiment is the outdoor unit 2 of (4-1) or (4-2) above, and further includes a bellmouth 45.
  • the bellmouth 45 is disposed in the first chamber S1, and has a cylindrical portion surrounding the fan 44.
  • a lower end 431 of the electrical component unit 420 is located above a lower end 451 of the cylindrical portion.
  • the fan 44 is disposed inside the cylindrical portion of the bellmouth 45.
  • the first refrigerant is heavier than air, so even if the first refrigerant leaks, the first refrigerant will accumulate below the lower end 451 of the cylindrical portion.
  • the lower end 431 of the electrical equipment unit 420 (specifically, the board 43 on which the electrical equipment 42 is mounted) is located above the lower end 451 of the cylindrical portion, so that even if there is a gap between the lower end of the partition plate 46 and the bottom plate 413 of the casing 41 and the first refrigerant goes into the second chamber S2, the first refrigerant accumulated below can be prevented from reaching the height level of the electrical equipment unit 420.
  • the outdoor unit 2 serving as an air conditioning unit according to this embodiment is any one of the outdoor units 2 described above in (4-1) to (4-3), in which the electrical component unit 420 is positioned above the first brazed portion 121.
  • the first refrigerant even if the first refrigerant leaks, the first refrigerant will remain below the first brazed portion 121.
  • the electrical equipment unit 420 is located above the first brazed portion 121, the first refrigerant can be further prevented from flowing to the electrical equipment.
  • the outdoor unit 2 as an air conditioning unit according to this embodiment is any one of the outdoor units 2 described above in (4-1) to (4-4), in which the first heat exchanger 12 is positioned below the second heat exchanger 23.
  • the first heat exchanger 12, through which the flammable refrigerant flows, is positioned below the second heat exchanger 23, through which the non-flammable refrigerant flows. Therefore, even if the first refrigerant leaks, the first refrigerant is likely to remain below, and since a distance can be maintained between the communication hole 461 and the first brazed portion 121, an outdoor unit 2 that prevents the first refrigerant from flowing into the electrical equipment unit 420 can be easily realized.
  • the outdoor unit 2 as an air conditioning unit is the outdoor unit 2 according to any one of (4-1) to (4-5) above, and further includes a first compressor 11, a second compressor 21, and a bell mouth 45.
  • the first compressor 11 is disposed in the second chamber S2 and compresses a first refrigerant.
  • the second compressor 21 is disposed in the second chamber S2 and compresses a second refrigerant.
  • the bell mouth 45 is disposed in the first chamber S1 and has a cylindrical portion surrounding the fan 44.
  • the first terminal 111 of the first compressor 11 and the second terminal 211 of the second compressor 21 are located above a lower end 451 of the cylindrical portion.
  • the first terminal 111 and the second terminal 211 are located above the lower end 451 of the cylindrical portion, so the possibility of ignition caused by the first terminal 111 and the second terminal 211 of the second chamber S2 as an ignition source can be reduced.
  • the outdoor unit 2 as an air conditioning unit according to this embodiment is any one of the outdoor units 2 described above in (4-1) to (4-5), and the second refrigerant contains carbon dioxide.
  • the air conditioning unit is the outdoor unit 2 of the cascade refrigeration cycle apparatus 1, but is not limited thereto.
  • the air conditioning unit of the present disclosure may be an indoor unit or a cascade unit.
  • the air conditioning unit of the cascade refrigeration cycle apparatus 1 performing cooling operation and heating operation has been described as an example, but the present invention is not limited thereto.
  • the cascade refrigeration cycle apparatus including the air conditioning unit of the present disclosure may further perform a dehumidification operation.
  • the cascade refrigeration cycle apparatus including the air conditioning unit of the present disclosure may be an air conditioner dedicated to cooling.
  • Dual refrigeration cycle device 2 Outdoor unit (air conditioning unit) 3: Indoor unit 11: First compressor 12: First heat exchanger 21: Second compressor 23: Second heat exchanger 25: Third heat exchanger 30: Cascade heat exchanger 41: Casing 42: Electrical components 43: Board 44: Fan 45: Bell mouth 46: Partition plate 111, 211: Terminal 120: Brazed portion 121: First brazed portion 420: Electrical component unit 431, 451: Lower end 461: Communication hole S1: First chamber S2: Second chamber

Landscapes

  • Other Air-Conditioning Systems (AREA)

Abstract

Une unité de climatisation comprend une unité de composant électrique (420), un premier échangeur de chaleur (12), un second échangeur de chaleur (23), un ventilateur (44), un boîtier (41) et une plaque de séparation (46). Le premier échangeur de chaleur (12) effectue un échange de chaleur entre un premier milieu combustible et de l'air. Le second échangeur de chaleur (23) effectue un échange de chaleur entre un second milieu non combustible et de l'air. Le ventilateur (44) envoie de l'air au premier échangeur de chaleur (12) et au second échangeur de chaleur (23). La plaque de séparation (46) sépare l'intérieur du boîtier (41) en une première chambre (S1) où le premier échangeur de chaleur (12), le second échangeur de chaleur (23) et le ventilateur (44) sont positionnés et une seconde chambre (S2) où l'unité de composant électrique (420) est positionnée. Un trou de communication (461) par l'intermédiaire duquel la première chambre (S1) et la seconde chambre (S2) sont en communication est ménagé dans la plaque de séparation (46) à un emplacement plus élevé qu'une première partie de brasage positionnée le plus haut (121) par rapport à une pluralité de parties de brasage (120) du premier échangeur de chaleur (12).
PCT/JP2023/041728 2022-12-12 2023-11-21 Unité de climatisation WO2024127924A1 (fr)

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JP2022198099A JP2024083974A (ja) 2022-12-12 2022-12-12 空調ユニット

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010053874A (ja) * 2009-12-11 2010-03-11 Panasonic Corp 密閉型電動圧縮機
JP2012172890A (ja) * 2011-02-21 2012-09-10 Mitsubishi Electric Corp 冷凍装置
JP2014006027A (ja) * 2012-06-27 2014-01-16 Mitsubishi Electric Corp 冷凍サイクル装置
JP5430604B2 (ja) 2011-04-08 2014-03-05 三菱電機株式会社 二元冷凍装置
US20150338145A1 (en) * 2014-05-22 2015-11-26 Lg Electronics Inc. Heat pump
WO2022013976A1 (fr) * 2020-07-15 2022-01-20 三菱電機株式会社 Unité extérieure pour dispositif de réfrigération et dispositif de réfrigération comprenant celle-ci

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010053874A (ja) * 2009-12-11 2010-03-11 Panasonic Corp 密閉型電動圧縮機
JP2012172890A (ja) * 2011-02-21 2012-09-10 Mitsubishi Electric Corp 冷凍装置
JP5430604B2 (ja) 2011-04-08 2014-03-05 三菱電機株式会社 二元冷凍装置
JP2014006027A (ja) * 2012-06-27 2014-01-16 Mitsubishi Electric Corp 冷凍サイクル装置
US20150338145A1 (en) * 2014-05-22 2015-11-26 Lg Electronics Inc. Heat pump
WO2022013976A1 (fr) * 2020-07-15 2022-01-20 三菱電機株式会社 Unité extérieure pour dispositif de réfrigération et dispositif de réfrigération comprenant celle-ci

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