WO2017022001A1 - 空気調和機の室外機および空気調和機 - Google Patents
空気調和機の室外機および空気調和機 Download PDFInfo
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- WO2017022001A1 WO2017022001A1 PCT/JP2015/071733 JP2015071733W WO2017022001A1 WO 2017022001 A1 WO2017022001 A1 WO 2017022001A1 JP 2015071733 W JP2015071733 W JP 2015071733W WO 2017022001 A1 WO2017022001 A1 WO 2017022001A1
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- WIPO (PCT)
- Prior art keywords
- air conditioner
- outdoor unit
- cooled
- refrigerant
- component box
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/24—Cooling of electric components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/22—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/46—Component arrangements in separate outdoor units
- F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
- F24F1/50—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow with outlet air in upward direction
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20936—Liquid coolant with phase change
Definitions
- the present invention relates to an outdoor unit of an air conditioner and an air conditioner.
- Patent Document 1 discloses a structure in which a power element is cooled by a refrigerant used in a refrigeration cycle.
- a refrigerant passage through which a refrigerant used in a refrigeration cycle flows is attached to a refrigerant jacket (a heat sink in Patent Document 1), a power element is fixed to the refrigerant jacket, and the refrigerant jacket is housed in an electrical component box.
- a service opening is provided on the outer surface of the outdoor unit casing in order to visually recognize the connection state between the refrigerant jacket and the power element at the time of manufacture or repair, and the refrigerant jacket is used for service.
- a structure is disclosed in which the refrigerant jacket is disposed on the front side of the power element as viewed from the service opening and facing the opening.
- Patent Document 2 that is, the refrigerant jacket is arranged on the front side of the power element when viewed from the service opening, the power element cannot be cooled when the circulation of the refrigerant in the refrigeration cycle is stopped, and the power The device may be destroyed.
- the present invention can effectively cool a component to be cooled (component to be cooled) such as a power element even when there is no circulation of refrigerant, and can suppress destruction of the component to be cooled due to heat generation.
- the purpose is to provide outdoor units and air conditioners.
- the present invention provides a housing, a heat exchanger that exchanges heat between the refrigerant flowing inside and air, a blower fan that sucks air outside the housing and passes the heat exchanger, a substrate,
- An outdoor unit of an air conditioner comprising: an electric component box having a component to be cooled; and a cooling member that cools the component to be cooled by a refrigerant that is thermally connected to the component to be cooled and flows inside.
- the member is provided on an outer wall surface of the electric component box that serves as a blowing path of the blower fan.
- FIGS. 1 is a side view of an outdoor unit
- FIG. 2 is a front view of FIG. 1 (outdoor unit)
- FIG. 3 is a front view of an electrical component box
- FIG. 4 is a front view of an inverter board
- FIG. 6 is a front view of the inverter board and the refrigerant jacket.
- the compressor 1 is composed of a fan guard 1, a blower fan 3, a fan motor 4, an electric component box 5, a compressor 6, an accumulator 7, and a heat exchanger 8.
- the compressor 6 sucks and compresses the refrigerant, and discharges the compressed refrigerant.
- Various compressors such as a scroll compressor can be adopted as the compressor 6.
- the heat exchanger 8 is an air heat exchanger for exchanging heat between the refrigerant and the outside air, and a cross fin type fin-and-tube heat exchanger or the like can be adopted.
- the blower fan 3 is a propeller fan, and is provided in the upper part and the center part of the outdoor unit, and blows the outside air that has passed through the heat exchanger 8 upward.
- the accumulator 7 gas-liquid separates the flowing refrigerant and sends the separated gas refrigerant to the compressor 6.
- the electrical component box 5 stores electrical components in a housing formed of sheet metal, is provided on a side surface of the outdoor unit housing, and is disposed in a blower path of the blower fan 3 in the outdoor unit housing. Although details will be described later, a refrigerant jacket 20 and a refrigerant pipe 14 are fixed to the electric component box 5 in order to cool a component to be cooled among the electric components.
- FIG. 2 shows a front view of FIG.
- the electrical component box 5 is arranged on the front side.
- FIG. 3 shows a detailed front view of the electrical component box 5 shown in FIG.
- the main components constituting the electric component box 5 are an inverter board 9, a noise filter board 10, and a control board 11.
- the inverter board 9 supplies power for driving the compressor 6, and the noise filter board 10 is generated by the inverter board 9. Suppresses electrical noise.
- the control board 11 transmits signals between the outdoor unit and the indoor unit of the air conditioner.
- FIG. 4 shows a front view of the inverter board 9, and the power element 12 is arranged on the back surface of the inverter board 9.
- FIG. 5 shows the power element 12 and the refrigerant jacket 13.
- the power element 12 is a switching element of the inverter circuit of the inverter board 9 that supplies power to the compressor 6, and is a heat generating component that generates heat when the compressor 6 is operated. That is, it is one of the parts to be cooled that needs to be cooled, and if the power element 12 is not sufficiently cooled, the temperature at which the power element 12 can operate may be exceeded.
- the refrigerant jacket 13 is made of a metal such as aluminum in a flat rectangular parallelepiped shape, and covers a part of the refrigerant pipe 14 connected to the heat exchanger 8 and is thermally connected to the refrigerant pipe 14. After passing through the refrigerant jacket 13, the refrigerant pipe 14 is folded back into a U shape and passes through the refrigerant jacket 13 again.
- a cooling member is comprised by the refrigerant
- FIG. 6 shows a side view of the inverter board 26, the electric component box sheet metal 21, and the refrigerant jacket 20.
- the refrigerant jacket 20 is attached to the electric component box metal plate 21, and the refrigerant jacket 20 cools the power element 25 mounted on the inverter board 26.
- the refrigerant jacket 20 is fixed to the electrical component box 21 by a refrigerant jacket mounting screw 22.
- the inverter board 26 is fixed to the electrical component box 21 by board mounting screws 23.
- the power element 25 is fixed to the refrigerant jacket 20 by a power element mounting screw 24.
- the maintenance performance can be improved by attaching the refrigerant jacket attachment screw 22, the substrate attachment screw 23, and the power element attachment screw 24 from the service opening 15 (front side) side.
- the electrical component box sheet metal 21 has an opening in a part thereof, and the refrigerant jacket 20 and the power element 25 can be directly connected through the opening. The heat of the power element 25 is conducted to the refrigerant jacket 20 and radiated to the refrigerant flowing through the refrigerant pipe.
- the refrigerant jacket 20 condenses in the outdoor heat exchanger 8 during the cooling operation and flows a refrigerant having a temperature lower than the temperature of the power element 25, and condenses in the heat exchanger of the indoor unit during the heating operation and lower than the temperature of the power element 25.
- the refrigerant flows.
- the temperature of the refrigerant flowing through the refrigerant jacket 20 varies depending on operating conditions, outside air conditions, and the like, the temperature generated by the power element 25 mounted on the inverter board 26 is, for example, about 40 to 45 ° C. during cooling operation. 20, and dissipates heat to the refrigerant flowing through the refrigerant pipe 14 in the refrigerant jacket 20. Thereby, the power element 25 is maintained at an operable temperature.
- the power element 25 is effectively blown by the blower fan 3 even when there is no circulation of the refrigerant.
- the power element 25 can be prevented from being destroyed by heat generation.
- the cooling performance can be further improved by providing the refrigerant jacket 20 on the back side of the electrical component box 5 facing the central space in the outdoor unit having a large amount of air in the air flow path. Even when the refrigerant is circulating, the cooling performance can be improved because the cooling action by the air blow occurs in addition to the cooling by the refrigerant.
- the coolant cooling coolant jacket 20 can be made thinner in shape, so that air blowing by the blower fan 3 is not hindered, and air blowing efficiency can be improved.
- the heating efficiency or cooling efficiency as an air conditioner can be improved.
- the refrigerant jacket 20 on the back side, when the service opening 15 is opened, the parts that require maintenance such as the inverter board 26 and the power element 25 can be viewed from the front side so that the parts can be viewed from the service opening 15 side. Since it can arrange
- FIG. 7 shows the manufacturing method of Example 1.
- the refrigerant pipe 14 is attached to the refrigerant jacket 20.
- the refrigerant jacket 20 is fixed to the electric component box metal plate 21 with the refrigerant jacket mounting screw 22.
- the inverter board 26 on which the power element 25 is mounted is attached to the electric component box sheet metal 21 via the spacer 27.
- the inverter board 26 is fixed to the electric component box metal plate 21 with the board mounting screws 23.
- the power element 25 is fixed to the electric component box sheet metal 21 by the power element mounting screw 24.
- the refrigerant jacket 20, the electric component box sheet metal 21, the power element 25, and the inverter board 26 can be fixed integrally by the procedures (a) to (e). Further, the fixing direction of the refrigerant jacket mounting screw 22, the board mounting screw 23, and the power element mounting screw 24 at the time of fixing is set from one side, and in particular, all screws can be detached from the service opening 15 side. Therefore, workability can be greatly improved. Further, since the power element 25 is located on the solder surface (back surface) side of the inverter board 26, it does not occupy the component surface (front surface) of the inverter board 26, and a smaller inverter board 26 can be adopted, and the cost is reduced. Reduction can be achieved.
- FIG. 8 shows a side view of the inverter board 26, the electric component box sheet metal 21, and the refrigerant jacket 20.
- FIG. 8 differs from FIG. 6 of the first embodiment in that the power element 25 is in contact with the refrigerant jacket 20 via the electric component box sheet metal 21.
- the refrigerant jacket 20 is attached to the electric component box sheet metal 21, and the refrigerant jacket 20 cools the power element 25 mounted on the inverter board 26.
- the refrigerant jacket 20 is fixed to the electric component box sheet metal 21 by a refrigerant jacket mounting screw 22.
- the inverter board 26 is fixed to the electrical component box sheet metal 21 by board mounting screws 23.
- the power element 25 is attached to the electric component box metal plate 21 by a power element attachment screw 24.
- the heat of the power element 25 is conducted to the refrigerant jacket 20 through the electric component box sheet metal 21 and is radiated to the refrigerant flowing through the refrigerant pipe 14.
- the refrigerant jacket 20 on the back surface of the electrical component box 5 serving as a blowing path by the blower fan 3, it is possible to cool the power element 25 by blowing the blower fan 3 even when there is no circulation of the refrigerant.
- the destruction of the power element 25 due to heat generation can be avoided.
- the power element 25 can be attached to the refrigerant jacket 20 via the electric component box metal plate 21, processing for providing an opening in the electric component box metal plate 21 is unnecessary, and the processing cost can be reduced.
- the electric component box sheet metal 21 is also cooled at the same time, other components (for example, a capacitor and a reactor) in the electric component box 25 can be cooled, and the life of the other components can be improved.
- FIG. 9 shows the manufacturing method of Example 2.
- the refrigerant pipe 14 is attached to the refrigerant jacket 20.
- the refrigerant jacket 20 is fixed to the electric component box metal plate 21 with the refrigerant jacket mounting screw 22.
- the inverter board 26 on which the power element 25 is mounted is attached to the electric component box sheet metal 21 via the spacer 27.
- the inverter board 26 is fixed to the electric component box metal plate 21 with the board mounting screw 23, and the power element 25 is fixed to the electric component box metal plate 21 with the power element mounting screw 24.
- FIG. 10 shows a side view of the inverter board 26, the electric component box sheet metal 21, and the refrigerant pipe 14.
- FIG. 10 differs from FIG. 6 of the first embodiment in that the electrical component box sheet metal 21 is in direct contact with the refrigerant pipe 14 and there is no refrigerant jacket 20.
- the inverter board 26 is fixed to the electrical component box sheet metal 21 by board mounting screws 23.
- the power element 25 is fixed to the electric component box sheet metal 21 by a power element mounting screw 24. The heat of the power element 25 is conducted to the refrigerant pipe 14 and radiated to the refrigerant flowing through the refrigerant pipe 14.
- the power element 25 can be cooled by blowing the blower fan 3 even when there is no circulation of the refrigerant. It becomes possible, and destruction of the power element 25 due to heat generation can be avoided. Further, since the refrigerant jacket 20 is not required, the cost can be reduced and the cooling structure of the power element 25 can be realized.
- FIG. 11 shows a side view of the inverter board 26, the electric component box sheet metal 21, and the refrigerant jacket 20.
- 11 differs from FIG. 6 of the first embodiment in that the refrigerant jacket mounting screw 22 is closer to the center of the inverter board 26 than the board mounting screw 23.
- the refrigerant jacket 20 can be fixed in the vicinity of the power element 25 by attaching the refrigerant jacket attachment screw 22 to a position closer to the power element 25 than the board attachment screw 23.
- the refrigerant jacket 20 is attached to the electric component box sheet metal 21, and the power element 25 mounted on the inverter board 26 is cooled.
- the refrigerant jacket 20 is fixed to the electric component box sheet metal 21 by a refrigerant jacket mounting screw 22.
- the inverter board 26 is fixed to the electrical component box 21 by board mounting screws 23.
- the power element 25 is fixed to the refrigerant jacket 20 by a power element mounting screw 24. The heat of the power element 25 is conducted to the refrigerant jacket 20 and radiated to the refrigerant flowing through the refrigerant pipe 14.
- the power element 25 can be cooled by blowing the blowing fan 3 even when there is no circulation of the refrigerant. It becomes possible, and destruction of the power element 25 due to heat generation can be avoided.
- FIG. 12 shows a front view of the inverter board 9.
- FIG. 12 differs from FIG. 4 in that a plurality of power elements of the first power element 12 and the second power element 30 are mounted on the inverter board 9.
- FIG. 13 shows a side view of FIG. FIG. 12 differs from FIG. 6 of the first embodiment in that a plurality of power elements are mounted.
- the refrigerant jacket 20 is attached to the electric component box sheet metal 21, and the first power element 25 and the second power element 31 mounted on the inverter board 26 are cooled.
- the refrigerant jacket 20 is fixed to the electric component box sheet metal 21 by a refrigerant jacket mounting screw 22.
- the inverter board 26 is fixed to the electrical component box 21 by board mounting screws 23.
- the first power element 25 and the second power element 31 are attached to the refrigerant jacket 20 by a power element attachment screw 24.
- the heat of the first power element 25 and the second power element 31 is conducted to the refrigerant jacket 20 and dissipated to the refrigerant flowing through the refrigerant pipe 14.
- the first inverter board 9 and the second inverter board 32 are mounted on the electrical component box 5.
- the first inverter board 9 and the second inverter board 32 drive different compressors, respectively, or the first inverter board 9 drives the compressor 6 and the second inverter board 32 drives the fan motor 4.
- a power element 25 is mounted on the first inverter board 9 and the second inverter board 32, and the plurality of power elements are cooled by a single refrigerant jacket 20 formed integrally as shown in FIG.
- the refrigerant jacket 20 on the back surface of the electrical component box 5 serving as a blowing path by the blower fan 3, it is possible to cool the power element 25 by blowing the blower fan 3 even when there is no circulation of the refrigerant. Thus, the destruction of the power element 25 due to heat generation can be avoided.
- an air conditioner By constructing an air conditioner by pipe-connecting the outdoor units from Example 1 to Example 5 as described above and at least one indoor unit, it is possible to suppress the destruction of parts to be cooled such as power elements and improve reliability. It can be set as the improved air conditioner.
- the blower fan 3 is attached to the upper part of the outdoor unit of the air conditioner.
- the blower fan 3 is an outdoor unit of the air conditioner. It will be apparent to those skilled in the art that the same effect can be obtained with a so-called “horizontal wiper shape” attached to the front face of the head.
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Abstract
Description
2…室外機の正面
3…送風ファン
4…ファンモータ
5…電気部品箱
6…圧縮機
7…アキュムレータ
8…熱交換器
9、26、32…インバータ基板
10…ノイズフィルタ基板
11…制御基板
12、25、30、31…パワー素子(被冷却部品)
13、20…冷媒ジャケット(冷却部材)
14…冷媒配管(冷却部材)
15…サービス開口部
21…電気部品箱板金
22…冷媒ジャケット取り付けネジ
23…基板取り付けネジ
24…パワー素子取り付けネジ(被冷却部品取り付けネジ)
27…スペーサ
Claims (11)
- 筐体と、内部を流れる冷媒と空気を熱交換させる熱交換器と、前記筐体外の空気を吸い込み前記熱交換器を通過させる送風ファンと、基板および被冷却部品を有する電気部品箱と、前記被冷却部品に熱的に接続され内部を流れる冷媒により前記被冷却部品を冷却する冷却部材と、を備える空気調和機の室外機であって、
前記冷却部材は、前記送風ファンの送風経路となる前記電気部品箱の外壁面に設けられる空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記送風ファンは、前記筐体の上部に前記筐体内の空気を上方へ吹き出すように設けられ、
前記電気部品箱は、前記筐体の側面に設けられ、
前記冷却部材は、前記筐体の中央空間に面した前記電気部品箱の背面側に設けられる空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記筐体は、前記電気部品箱に対応した位置に開閉可能なサービス用開口部を備え、
前記サービス用開口部を開けたとき、前記被冷却部品が手前側、前記冷却部材が背面側に配置されている空気調和機の室外機。 - 請求項3に記載の空気調和機の室外機であって、
前記基板を固定する基板取り付けネジおよび前記被冷却部品を固定する被冷却部品取り付けネジは、前記サービス用開口部側から取り付けられる空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記基板を固定する基板取り付けネジよりも前記冷却部材を固定する冷却部材取り付けネジが前記被冷却部品に近い位置に取り付けられる空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記電気部品箱は開口部を有し、前記開口部を介して前記被冷却部品と前記冷却部材とが直接固定される空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記冷却部材は、内部を冷媒が流れる冷媒配管と、前記冷媒配管および前記被冷却部品の間に介在し前記冷媒配管および前記被冷却部品を熱的に接続する冷媒ジャケットとで構成される空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記冷却部材は、内部に冷媒が流れる冷媒配管で構成され、前記被冷却部品に直接接触し熱的に接続される空気調和機の室外機。 - 請求項1に記載の空気調和機の室外機であって、
前記電気部品箱は板金で形成され、前記被冷却部品と前記冷却部材とは前記電気部品箱の板金を介して熱的に接続される空気調和機の室外機。 - 請求項7に記載の空気調和機の室外機であって、
前記電気部品箱は複数の被冷却部品を有し、
前記複数の被冷却部品は、一体に構成された単一の前記冷媒ジャケットに熱的に接続される空気調和機の室外機。 - 請求項1から請求項10のいずれか一つに記載の空気調和機の室外機と、少なくとも一台の室内機と、が配管接続されて構成される空気調和機。
Priority Applications (6)
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JP2017532240A JP6594428B2 (ja) | 2015-07-31 | 2015-07-31 | 空気調和機の室外機および空気調和機 |
CN201580081919.0A CN107850323B (zh) | 2015-07-31 | 2015-07-31 | 空调机的室外机以及空调机 |
BR112018001446-0A BR112018001446A2 (ja) | 2015-07-31 | 2015-07-31 | The exterior unit of an air harmony machine, and an air harmony machine |
US15/748,254 US10527299B2 (en) | 2015-07-31 | 2015-07-31 | Outdoor unit for air conditioner, and air conditioner |
EP15900315.1A EP3330623A4 (en) | 2015-07-31 | 2015-07-31 | EXTERNAL UNIT FOR AIR CONDITIONING AND AIR CONDITIONING |
PCT/JP2015/071733 WO2017022001A1 (ja) | 2015-07-31 | 2015-07-31 | 空気調和機の室外機および空気調和機 |
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PCT/JP2015/071733 WO2017022001A1 (ja) | 2015-07-31 | 2015-07-31 | 空気調和機の室外機および空気調和機 |
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US (1) | US10527299B2 (ja) |
EP (1) | EP3330623A4 (ja) |
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Cited By (4)
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WO2019146832A1 (ko) * | 2018-01-26 | 2019-08-01 | 삼성전자(주) | 공기조화기의 실외기 |
JPWO2019073535A1 (ja) * | 2017-10-11 | 2020-02-27 | 日立ジョンソンコントロールズ空調株式会社 | 空気調和機の室外機 |
JP7125638B1 (ja) | 2021-03-22 | 2022-08-25 | ダイキン工業株式会社 | 冷凍装置の室外ユニット |
WO2022202590A1 (ja) * | 2021-03-22 | 2022-09-29 | ダイキン工業株式会社 | 電装品ユニットおよび冷凍装置の室外ユニット |
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US11480349B2 (en) | 2018-01-26 | 2022-10-25 | Samsung Electronics Co., Ltd. | Outdoor unit of air conditioner |
JP7125638B1 (ja) | 2021-03-22 | 2022-08-25 | ダイキン工業株式会社 | 冷凍装置の室外ユニット |
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JP2022146442A (ja) * | 2021-03-22 | 2022-10-05 | ダイキン工業株式会社 | 冷凍装置の室外ユニット |
Also Published As
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US20180216836A1 (en) | 2018-08-02 |
CN107850323A (zh) | 2018-03-27 |
JP6594428B2 (ja) | 2019-10-23 |
CN107850323B (zh) | 2020-09-08 |
BR112018001446A2 (ja) | 2018-09-11 |
EP3330623A4 (en) | 2019-03-20 |
JPWO2017022001A1 (ja) | 2018-04-05 |
EP3330623A1 (en) | 2018-06-06 |
US10527299B2 (en) | 2020-01-07 |
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